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  • Kinetics  (46)
  • Cell Line  (35)
  • American Association for the Advancement of Science (AAAS)  (81)
  • American Institute of Physics (AIP)
  • 1975-1979  (81)
Collection
Keywords
Publisher
  • American Association for the Advancement of Science (AAAS)  (81)
  • American Institute of Physics (AIP)
  • Springer  (16)
  • Wiley-Blackwell  (3)
Years
Year
  • 1
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    Thiourea reverses cross-links and restores biological activity in DNA treated with dichlorodiaminoplatinum (II) (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-04-13
    Description: Cis and trans dichlorodiaminoplatinum (II) compounds bind to DNA and form DNA cross-links, which are usually considered to be irreversible. Thiourea can reverse these cross-links without any apparent breakdown of the DNA. In addition, cis- and trans-Pt (II) treatment of lambda decreases its transfectivity. After suitable incubation with thiourea, full transfectivity of Pt(II)-treated lambda DNA can be restored.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Filipski, J -- Kohn, K W -- Prather, R -- Bonner, W M -- New York, N.Y. -- Science. 1979 Apr 13;204(4389):181-3.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/571145" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Line ; Coliphages ; DNA/*metabolism ; DNA, Neoplasm/metabolism ; DNA, Viral/metabolism ; Leukemia L1210 ; Organoplatinum Compounds/*antagonists & inhibitors ; Structure-Activity Relationship ; Thiourea/*pharmacology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 2
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    Genetic mechanism accounting for precise immunoglobulin domain deletion in a variant of MPC 11 myeloma cells (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-12-14
    Description: A variant of the MPC 11 cell line, M 311, produces a short immunoglobulin heavy chain. When compared with the parental gamma 2b heavy chain, M 311 was found to have a carboxyl terminal deletion comprising the CH3 domain. The COOH-terminal cyanogen bromide (CNBr) cleavage fragment of M 311 is identical to a corresponding segment ofa parental heavy chain CNBr fragment, with the exception of a substitution of asparagine for lysine at the COOH-terminal residue. This observation enabled prediction of both the parental DNA sequence in this region and the genetic mechanism which generated the variant, a frameshift followed by premature termination. This hypothesis is supported by studies of the DNA sequence of the MPC 11 gamma 2b constant region gene.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kenter, A L -- Birshtein, B K -- R21 AI106328/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 1979 Dec 14;206(4424):1307-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/117550" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Line ; Chromosome Deletion ; Genes ; Immunoglobulin G/*genetics ; Immunoglobulin gamma-Chains/genetics ; Macromolecular Substances ; Melphalan/pharmacology ; Mice ; Mutation ; Myeloma Proteins/*genetics ; Neoplasms, Experimental/genetics ; Peptide Chain Termination, Translational ; Plasmacytoma/genetics
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  • 3
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    [3H]GABA binding in brains from Huntington's chorea patients: altered regulation by phospholipids? (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-09-14
    Description: Binding sites for tritum-labeled gamma-aminobutyric acid (GABA) in cerebellar cortex of Huntington's chorea patients have an increased affinity but unaltered maximum capacity as compared to binding sites in tissue from control patients. A similar binding pattern is produced in control membranes by treatment with Triton X-100, phospholipase C, or glycerophosphoethanolamine. Thus, it is likely that phospholipids or their metabolites regulate the accessibility of the GABA binding site and that this regulation is abnormal in Huntington's chorea.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lloyd, K G -- Davidson, L -- New York, N.Y. -- Science. 1979 Sep 14;205(4411):1147-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/224459" target="_blank"〉PubMed〈/a〉
    Keywords: Cerebellar Cortex/*metabolism ; Humans ; Huntington Disease/*metabolism ; Kinetics ; Membrane Lipids ; Phosphatidylethanolamines/physiology ; Polyethylene Glycols/pharmacology ; Receptors, Neurotransmitter/drug effects/*metabolism ; gamma-Aminobutyric Acid/*metabolism
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  • 4
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    Intercellular communication in pancreatic islet monolayer cultures: a microfluorometric study (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-05-25
    Description: Single islet cells in monolayer cultures of neonatal rat pancreas were microinjected with fluorescein and scanned topographically by microfluorometry. Fluorescein spread from an injected islet cell directly into neighboring islet cells, and, in the presence of 16.7 millimolar glucose, significantly more islet cells communicated with the injected cell than in glucose-free medium. Islet cells were also microinjected with glycolytic substrates and activators that produced transient changes in cellular levels of reduced pyridine nucleotides-nicotinamide adenine dinucleotide and nicotinamide adenine dinucleotide phosphate [NAD(P)H]. Changes in NAD(P)H fluorescence were observed in islet cells incubated first for 18 hours in very low glucose concentrations and then in a glucose-free medium and injected with glycolytic substrates and activators; however, little change of fluorescence occurred in adjacent islet cells. In contrast, after adding 16.7 millimolar glucose to the medium, injection of glycolytic substrates and activators produced transient changes in NAD(P)H fluorescence in the injected cell and in neighboring cells.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kohen, E -- Kohen, C -- Thorell, B -- Mintz, D H -- Rabinovitch, A -- New York, N.Y. -- Science. 1979 May 25;204(4395):862-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/35828" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Cell Communication/drug effects ; Fluoresceins ; Glucose/pharmacology ; Glycolysis ; Islets of Langerhans/cytology/*physiology ; Kinetics ; NAD/metabolism ; NADP/metabolism ; Rats ; Spectrometry, Fluorescence
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  • 5
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    A structural model for the kinetic behavior of hemoglobin (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-11-30
    Description: The tertiary structures of all liganded hemoglobins in the R state differ in detail. Steric hindrance arising from nonbonded ligand-globin interactions affects the binding of ligands such as CO and cyanide which preferentially form linear axial complexes to heme; these ligands bind in a strained off-axis configuration. Ligands such as O2 and NO, which preferentially form bent complexes, encounter less steric hindrance and can bind in their (preferred) unstrained configuration. Linear complexes distort the ligand pockets in the R state (and by inference, in the T state) more than bent complexes. These structural differences between linear and bent complexes are reflected in the kinetic behavior of hemoglobin. Structural interpretation of this kinetic behavior indicates that the relative contributions of nonbonded ligand-globin interactions and nonbonded heme interactions to transition state free energies differ for linear and bent ligands. The relative contributions of these interactions to the free energy of cooperativity may also differ for linear and bent ligands. Thus the detailed molecular mechanism by which the affinity of heme is regulated differs for different ligands.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Moffat, K -- Deatherage, J F -- Seybert, D W -- New York, N.Y. -- Science. 1979 Nov 30;206(4422):1035-42.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/493990" target="_blank"〉PubMed〈/a〉
    Keywords: Allosteric Regulation ; Animals ; Heme/*metabolism ; Hemoglobins/metabolism ; Horses ; Kinetics ; Ligands ; Oxygen/*metabolism ; Oxyhemoglobins/*metabolism ; Protein Conformation ; Stereoisomerism ; Structure-Activity Relationship
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  • 6
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    Octopamine receptors, adenosine 3',5'-monophosphate, and neural control of firefly flashing (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-01-05
    Description: An adenylate cyclase activated as much as 25-fold by low concentrations of octopamine has been identified in the firefly lantern. The relative potency of octopamine and various other amines in stimulating this enzyme, and effects of antagonists in blocking octopamine activation, correlate well with the known effects of these agents in affecting light production. In addition to suggesting a role for adenosine 3',5'-monophosphate (or pyrophosphate) in the neural control of firefly flashing, identification of this potent enzyme should facilitate the characterization of phenylethylamine receptors in excitable tissue.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Nathanson, J A -- New York, N.Y. -- Science. 1979 Jan 5;203(4375):65-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/214856" target="_blank"〉PubMed〈/a〉
    Keywords: Adenylyl Cyclases/*metabolism ; Animals ; Beetles/*physiology ; Catecholamines/pharmacology ; Cyclic AMP/*biosynthesis ; Dose-Response Relationship, Drug ; Enzyme Activation/drug effects ; Kinetics ; Octopamine/*pharmacology ; Phentolamine/pharmacology ; Propranolol/pharmacology ; Receptors, Cell Surface/*drug effects ; Receptors, Neurotransmitter/*drug effects ; Structure-Activity Relationship
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  • 7
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    Endogenous inhibitor of colchicine-tubulin binding in rat brain (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-08-10
    Description: A competitive inhibitor of colchicine binding to tubulin has been found in rat brain. Most of the inhibitor is associated with microsomes but some inhibitor, with an apparent molecular weight of approximately 250,000, is found in the cytosol. Both the microsomal and cytosol inhibitors are heat- and trypsin-sensitive, indicating that a protein moiety is required for activity. The microsomes bind tubulin directly; the microsomal and cytosol fractions both inhibit microtubule assembly in vitro. The inhibitor may function in the living cell to bind and sequester non-polymerized tubulin. Regulation of tubulin attachment to microsomes could then control the concentration of cytosolic tubulin available for microtubule assembly.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sherline, P -- Schiavone, K -- Brocato, S -- New York, N.Y. -- Science. 1979 Aug 10;205(4406):593-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/451622" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Brain/*metabolism ; Colchicine/*metabolism ; Cytosol/physiology ; Glycoproteins/*metabolism ; Kinetics ; Microsomes/metabolism ; Microtubules/ultrastructure ; Nerve Tissue Proteins/*physiology ; Protein Binding/drug effects ; Rats ; Tubulin/*metabolism
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  • 8
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    4-aminobutyrate:2-oxoglutarate aminotransferase in blood platelets (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-08-17
    Description: Platelet lysates obtained from blood of humans, dogs, and rats catalyzed the transamination of 4-aminobutyrate with 2-oxoglutarate as cosubstrate. Human platelet 4-aminobutyrate:2-oxoglutarate aminotransferase (36.5 +/- 3.2 picomoles per minute per milligram of platelet protein) resembled the brain enzyme in kinetic properties and in response to cofactors and inhibitors.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉White, H L -- New York, N.Y. -- Science. 1979 Aug 17;205(4407):696-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/462176" target="_blank"〉PubMed〈/a〉
    Keywords: 4-Aminobutyrate Transaminase/*blood ; Animals ; Blood Platelets/*enzymology ; Brain/enzymology ; Dogs ; Enzyme Activation/drug effects ; Humans ; Kinetics ; Pyridoxal Phosphate/pharmacology ; Rats ; Substrate Specificity ; Transaminases/*blood ; gamma-Aminobutyric Acid/blood
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  • 9
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    Inhibition of histaminase release from human granulocytes by products of histaminase activity (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-10-05
    Description: Imidazoleacetic acid, a product of the action of histaminase (E.C. 1.4.3.6) on histamine, inhibits specific release of histaminase from human peripheral blood granulocytes with an inhibition constant between 5 X 10(-9)M and 1 X 10(-8)M. Hence, modulation of enzyme release is indirectly mediated by the activity of the enzyme.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Herman, J J -- Brenner, J K -- Colten, H R -- New York, N.Y. -- Science. 1979 Oct 5;206(4414):77-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/113872" target="_blank"〉PubMed〈/a〉
    Keywords: Acetates/pharmacology ; Amine Oxidase (Copper-Containing)/*blood ; Biological Transport/drug effects ; Feedback ; Granulocytes/*enzymology ; Humans ; Imidazoles/*pharmacology ; Kinetics
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  • 10
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    Permeability of the cell-to-cell membrane channels in mammalian cell juncton (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-07-27
    Description: The channels in the junctions of various mammalian cell types--primary cultures and lines--were probed with a series of linear fluorescent amino acid and peptide molecules of different size and charge. Permeability is limited by probe size and electronegativity, these two factors apparently being related reciprocally. In respect to both factors, mammalian junctional channels are more restrictive than insect channels; hence the mammalian channels are narrower, more polar, or both. The channels of the various mammalian cell types differed slightly from each other; in some types the serum of the culture medium affected the channel permeability.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Flagg-Newton, J -- Simpson, I -- Loewenstein, W R -- New York, N.Y. -- Science. 1979 Jul 27;205(4404):404-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/377490" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Line ; Cell Membrane/physiology ; *Cell Membrane Permeability ; Cells, Cultured ; Cricetinae ; Fluorescent Antibody Technique ; Kidney ; Mice ; Mice, Inbred BALB C ; Species Specificity
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  • 11
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    Diffusion-like process can account for protein secretion by the pancreas (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-06-15
    Description: When fluid secretion by the pancreas was mechanically blocked, amylase secretion into the duct ceased. When flow was reduced in a graded fashion by the application of a back pressure, amylase output was reduced proportionately and amylase concentration in secretion was maintained constant. Thus, the secretion of digestive enzyme from the cell into the duct appears to be dependent upon the concentration of enzyme in the duct system. This behavior is most simply explained by diffusion-like (concentration dependent, bidirectional) fluxes of digestive enzyme across the plasma membrane. A unidirectional process, such as exocytosis, whose rate should be unaffected by fluid flow, cannot readily explain these results.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Isenman, L D -- Rothman, S S -- New York, N.Y. -- Science. 1979 Jun 15;204(4398):1212-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/451566" target="_blank"〉PubMed〈/a〉
    Keywords: Amylases/*secretion ; Animals ; Biological Transport ; Diffusion ; Exocytosis ; Hydrostatic Pressure ; Kinetics ; Pancreas/*secretion ; Rabbits ; Water-Electrolyte Balance
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  • 12
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    Calmodulin activation of adenylate cyclase in pancreatic islets (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-10-12
    Description: Pancreatic islets contain calmodulin. The protein binds to a particulate fraction derived from the islets and stimulates adenylate cyclase activity in this subcellular fraction, both phenomena being activated by ionized calcium. A calcium-dependent stimulation of adenylate cyclase by endogenous calmodulin may contribute to the accumulation of adenosine 3',5'-monophosphate evoked by insulin releasing agents in the islet cells.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Valverde, I -- Vandermeers, A -- Anjaneyulu, R -- Malaisse, W J -- New York, N.Y. -- Science. 1979 Oct 12;206(4415):225-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/225798" target="_blank"〉PubMed〈/a〉
    Keywords: Adenylyl Cyclases/*metabolism ; Animals ; Calcium/*physiology ; Calcium-Binding Proteins/*metabolism ; Calmodulin/*metabolism ; Cell Membrane/metabolism ; Cyclic AMP/metabolism ; Egtazic Acid/metabolism ; Enzyme Activation ; Female ; Glucose/pharmacology ; Insulin/*secretion ; Islets of Langerhans/*enzymology ; Kinetics ; Rats
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  • 13
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    Prolactin receptors in Rana catesbeiana during development and metamorphosis (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-05-25
    Description: Specific binding of ovine prolactin was found in microsomal preparations of tail, gill, and kidney of the bullfrog Ran catesbeiana. Binding by larval and adult liver and by kidney before larval stage XVII was low or nondetectable. Renal binding increased during metamorphic climax and in response to treatment with thyroid hormone. The emergence of renal binding of prolactin may signify a shift in the hormone's participation in the control of hydromineral homeostasis from the gill, which is resorbed, to the kidney. A renal action of prolactin during climax may facilitate metamorphosis.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉White, B A -- Nicoll, C S -- New York, N.Y. -- Science. 1979 May 25;204(4395):851-3.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/220708" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Gills/metabolism ; Kidney/metabolism ; Kinetics ; Liver/metabolism ; *Metamorphosis, Biological ; Microsomes/metabolism ; Prolactin/*physiology ; Rana catesbeiana/*growth & development ; Receptors, Cell Surface/*metabolism ; Tail/metabolism ; Thyroxine/pharmacology ; Water-Electrolyte Balance
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  • 14
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    Membrane effects of thyrotropin-releasing hormone and estrogen shown by intracellular recording from pituitary cells (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-05-04
    Description: The effects of thyrotropin-releasing hormone and 17 beta-estradiol on the electrical membrane properties of a prolactin-secretin pituitary cell line (GH3/B6) were studied with intracellular microelectrode recordings. Of the cells tested, 50 percent were excitable and displayed calcium-dependent action potentials when depolarized. When injected directly on the membrane of an excitable cell, thyrotropin-releasing hormone and 17 beta-estradiol induced action potentials within 1 minute. The spiking activity was preceded by a progressive increase of the input resistance without any detectable change in the resting membrane polarization. The results reveal a rapid effect of both substances on the membrane of GH3/B6 cells. In the case of thyrotropin-releasing hormone, which has both a short-term effect on release of prolactin and a long-term effect on its synthesis, the induced electrical activity may be associated with the stimulation of prolactin production. The physiological implication of 17 beta-estradiol-induced, calcium-dependent spiking activity remains to be elucidated.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Dufy, B -- Vincent, J D -- Fleury, H -- Du Pasquier, P -- Gourdji, D -- Tixier-Vidal, A -- New York, N.Y. -- Science. 1979 May 4;204(4392):509-11.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/107590" target="_blank"〉PubMed〈/a〉
    Keywords: Action Potentials/drug effects ; Cell Line ; Cell Membrane/drug effects ; Estradiol/*pharmacology ; Pituitary Gland/*drug effects ; Stimulation, Chemical ; Thyrotropin-Releasing Hormone/*pharmacology
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  • 15
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    Opiate (Enkephalin) receptors of neuroblastoma cells: occurrence in clusters on the cell surface (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-11-30
    Description: A bioactive, fluorescent derivative of enkephalin, Tyr-D-Ala-Gly-Phe-Leu-Lys-rhodamine, was used to determine the distribution of opiate receptors in living neuroblastoma cells. The receptors appeared in clusters on the cell surface, and no internalization was detected. No specific fluorescence or clusters were observed in the presence of [D-Ala2, Leu5]enkephalin or at 4 degrees C, and the clusters were much reduced under ionic conditions (that is, with 100 millimolars sodium) that specifically decrease the binding of opiate agonists.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hazum, E -- Chang, K J -- Cuatrecasas, P -- New York, N.Y. -- Science. 1979 Nov 30;206(4422):1077-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/227058" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Line ; Endorphins/*metabolism ; Enkephalins/*metabolism ; Mice ; Microscopy, Fluorescence ; Neoplasms, Experimental/metabolism ; Neuroblastoma/*metabolism ; Receptors, Opioid/*metabolism ; Synaptic Membranes/metabolism
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  • 16
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    Noncycling tumor cells are sensitive targets for the antiproliferative activity of human interferon (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-11-30
    Description: Resting Burkitt's lymphoma cells (Daudi) in culture are more sensitive targets for the antiproliferative activity of purified human fibroblast interferon than cells that are rapidly multiplying. Thus, interferon may be of significant clinical value in neoplasms involving stem cells and, after chemotherapy, in suppressing the reemergence of tumors.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Horoszewicz, J S -- Leong, S S -- Carter, W A -- New York, N.Y. -- Science. 1979 Nov 30;206(4422):1091-3.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/493995" target="_blank"〉PubMed〈/a〉
    Keywords: Burkitt Lymphoma/drug therapy/pathology ; Cell Cycle/drug effects ; Cell Division/*drug effects ; Cell Line ; Cells, Cultured ; Humans ; Interferons/*pharmacology/therapeutic use ; Lymphocytes/drug effects
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  • 17
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    Erythrosin B inhibits dopamine transport in rat caudate synaptosomes (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-07-27
    Description: Erythrosin B is a member of a class of fluorescein dyes that are suggested to elicit hyperkinesis when ingested by susceptible children. We found that erythrosin B inhibits dopamine uptake in rat caudate synaptosomes "uncompetitively" in the 10- to 800-micromolar range. Half maximal inhibition of uptake occurred at 45 micromolar. Uncompetitive inhibition denotes a decrease in efficacy of the dopamine membrane transport mechanism with an increase in affinity of dopamine to the carrier. Erythrosin B also decreased nonsaturable binding of dopamine to the synaptosome membrane. The inhibitory action of erythrosin B on dopamine uptake is consistent with the hypothesis that erythrosin B can act as a central excitatory agent able to induce hyperkinetic behavior.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lafferman, J A -- Silbergeld, E K -- New York, N.Y. -- Science. 1979 Jul 27;205(4404):410-2.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/451609" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Biological Transport/drug effects ; Caudate Nucleus/drug effects/*metabolism ; Dopamine/*metabolism ; Erythrosine/*pharmacology ; Fluoresceins/*pharmacology ; Kinetics ; Rats ; Synaptosomes/drug effects/*metabolism
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  • 18
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    beta1- and beta2-Adrenergic receptors in rat cerebral cortex are independently regulated (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-05-25
    Description: Repeated administration of the tricyclic antidepressant desmethylimipramine to adult rats for 10 days caused a 40% decrease in the density of beta1-adrenergic receptors in the cerebral cortex but had no effect on the density of beta2-adrenergic receptors. Conversely, destruction of noradrenergic neurons by administration of 6-hydroxydopamine to neonatal rats caused a 64% increase in the density of beta1-adrenergic receptors in adult cerebral cortex with no change in the density of beta2-adrenergic receptors. These results suggest that the beta-adrenergic receptors in rat cortex involved in neuronal function are primarily of the beta1 subtype.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Minneman, K P -- Dibner, M D -- Wolfe, B B -- Molinoff, P B -- New York, N.Y. -- Science. 1979 May 25;204(4395):866-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/35829" target="_blank"〉PubMed〈/a〉
    Keywords: Adrenergic beta-Agonists/metabolism ; Animals ; Binding, Competitive ; Cerebral Cortex/*metabolism ; Cyclic AMP/metabolism ; Desipramine/pharmacology ; Hydroxydopamines/pharmacology ; Kinetics ; Rats ; Receptors, Adrenergic/*metabolism ; Receptors, Adrenergic, beta/drug effects/*metabolism
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  • 19
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    Nuclear transcripts of mouse heavy chain immunoglobulin genes contain only the expressed class of C-region sequences (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-06-08
    Description: In plasmacytoma cells producing IgG, IgA, or IgM immunoglobulin heavy chains, the large precursors of the heavy chain messenger RNA's contain nucleotide sequences that specify only the expressed class of constant region. This indicates that the switch from one class of heavy chain to another during B cell ontogeny does not occur by altered processing of a complex gene transcript.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Marcu, K B -- Schibler, U -- Perry, R P -- New York, N.Y. -- Science. 1979 Jun 8;204(4397):1087-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/109919" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Base Sequence ; Cell Line ; Cell Nucleus/metabolism ; Immunoglobulin Constant Regions/*genetics ; Immunoglobulin Heavy Chains/*genetics ; Immunoglobulins/*genetics ; Mice ; Myeloma Proteins/*genetics ; Neoplasms, Experimental/immunology ; Nucleic Acid Precursors/genetics ; Plasmacytoma/immunology ; Poly A/metabolism ; RNA, Heterogeneous Nuclear/genetics ; *Transcription, Genetic
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  • 20
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    Thyroid hormone action at the cellular level (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-03-09
    Description: A large body of circumstantial evidence suggests that the basic unit of thyroid hormone action is the triiodothyronine nuclear receptor complex. This complex stimulates the formation, directly or indirectly, of a diversity of messenger RNA (mRNA) sequences. A generalized increase in mRNA as well as a disproportionate increase in a limited number of RNA sequences have been demonstrated. Regulation of thyroid hormone effects may be carried out largely at a local cellular level. Highly selective alterations in sensitivity to the triiodothyronine nuclear receptor complex may occur at specific target genes. Metabolic factors and hormones participate in such regulation. In a given tissue, alterations in the total number of receptor sites has not been shown to be useful as an index of thyroid hormone response, and local modulation of the response to the triiodothyronine receptor complex by a variety of factors other than triiodothyronine may be carried out at a postreceptor level.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Oppenheimer, J H -- New York, N.Y. -- Science. 1979 Mar 9;203(4384):971-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/218285" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Nucleus/metabolism ; Cytoplasm/metabolism ; Energy Metabolism ; Humans ; Kinetics ; Lipid Metabolism ; Protein Binding ; RNA, Messenger/biosynthesis ; Receptors, Cell Surface/*physiology ; Thyroid Gland/physiology ; Thyroxine/metabolism ; Tissue Distribution ; Triiodothyronine/*physiology
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  • 21
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    Chemotactic responses of tumor cells to products of resorbing bone (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-01-12
    Description: To explore possible mechanisms for the metastasis of malignant cells to bone, a model of tumor cell migration was developed, using Walker carcinosarcoma or malignant lymphoma cells. It was found that bone contains a factor that is strongly chemotactic for tumor cells. This factoor is released by a variety of agents that induce resorption of bone.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Orr, W -- Varani, J -- Gondex, M K -- Ward, P A -- Mundy, G R -- New York, N.Y. -- Science. 1979 Jan 12;203(4376):176-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/569363" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Bone Resorption/*physiopathology ; Bone and Bones/*physiopathology ; Carcinoma 256, Walker/*physiopathology ; Cell Line ; Cell Movement ; *Chemotaxis ; Chemotaxis, Leukocyte ; Lymphoma/physiopathology ; Neoplasm Metastasis ; Neoplasms, Experimental/physiopathology ; Organ Culture Techniques
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  • 22
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    Human macrophage migration inhibition factor: evidence for subunit structure (1979)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1979-07-20
    Description: Macrophage migration inhibition factor (MIF) derived from human lymphoid cell lines was found to lose biologic activity on dialysis. Although activity was not recovered in the dialyzate, mixing experiments demonstrated that the components in the retentate and dialyzate could reassociate to restore activity. The fragment of larger molecular weight (less than 10,000) could inhibit the activity of intact MIF, whereas the smaller molecular weight fragment (5,000 to 10,000) could not. These findings suggest that human MIF is composed of at least two noncovalently linked subunits. In analogy to the situation for certain bacterial toxins, one of these may represent an attachment piece for a target cell membrane receptor.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Possanza, G -- Cohen, M C -- Yoshida, T -- Cohen, S -- New York, N.Y. -- Science. 1979 Jul 20;205(4403):300-1.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/377487" target="_blank"〉PubMed〈/a〉
    Keywords: Cell Line ; Dialysis ; Humans ; In Vitro Techniques ; Lymphocytes/physiology ; Macromolecular Substances ; *Macrophage Migration-Inhibitory Factors ; Molecular Weight
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  • 23
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    Induction of differentiation in human promyelocytic leukemia cells by tumor promoters (1979)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1979-05-25
    Description: Phorbol diester tumor promoters and the promoter mezerein convert human promyelocytic leukemia cells in culture into adherent, nonproliferating cells with many of the characteristics of macrophages. Other types of promoters such as anthralin, phenobarbital, and saccharin do not have this effect. Various compounds that can inhibit some of the biological and biochemical effects of tumor promoters do not interfere with the induction of cell adherence and differentiation by the effective promoters.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Rovera, G -- O'Brien, T G -- Diamond, L -- New York, N.Y. -- Science. 1979 May 25;204(4395):868-70.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/286421" target="_blank"〉PubMed〈/a〉
    Keywords: Cell Adhesion/drug effects ; Cell Differentiation/*drug effects ; Cell Line ; Humans ; Leukemia, Myeloid, Acute/*pathology ; Phorbol Esters/pharmacology ; Phorbols/*pharmacology ; Tetradecanoylphorbol Acetate/*pharmacology
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  • 24
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    Heparin neutralization of PGI2: effects upon platelets (1979)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1979-08-03
    Description: Heparin neutralizes the inhibitory effect of prostacyclin (PGI2) on platelet aggregation. The PGI2-induced enhancement of platelet cyclic adenosine monophosphate levels is also inhibited. The mechanism appears to involve a direct interaction in which heparin neutralizes the inhibitory effects of PGI2 on platelet aggregation but, at the same time, does not lose its own anticoagulant activity. These findings may explain instances in which heparin infusions have been reported to produce hyperaggregation of platelets, thrombotic episodes, and thrombocytopenia in patients.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Saba, H I -- Saba, S R -- Blackburn, C A -- Hartmann, R C -- Mason, R G -- New York, N.Y. -- Science. 1979 Aug 3;205(4405):499-501.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/377493" target="_blank"〉PubMed〈/a〉
    Keywords: Adenosine Diphosphate/pharmacology ; Blood Coagulation/drug effects ; Epoprostenol/*pharmacology ; Heparin/*pharmacology ; Humans ; Kinetics ; Platelet Aggregation/*drug effects ; Prostaglandins/*pharmacology ; Thrombin/physiology
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  • 25
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    Oxytocin receptors: triggers for parturition and lactation? (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-06-22
    Description: Specific binding of tritiated oxytocin to uterine receptors of pregnant rats increases dramatically at term and is maximal during labor. In mammary glands the increase in binding is gradual, reaching a maximum during the lactation period. Concomitant changes in the sensitivity of the uterus and mammary gland to oxytocin indicate that the receptor concentration is of functional significance. Oxytocin receptors, therefore, may regulate the response of the target organs to circulating oxytocin and thereby control the onset of labor and lactation. Ovarian steroids participate in the regulation of oxytocin receptors in a manner as yet unclarified.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Soloff, M S -- Alexandrova, M -- Fernstrom, M J -- New York, N.Y. -- Science. 1979 Jun 22;204(4399):1313-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/221972" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Estradiol/blood ; Female ; Kinetics ; *Labor, Obstetric ; *Lactation ; Mammary Glands, Animal/metabolism ; Myometrium/*metabolism ; Oxytocin/blood/*metabolism ; Pregnancy ; Progesterone/blood ; Receptors, Cell Surface/*metabolism ; Uterus/*metabolism
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  • 26
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    GABA receptors in clonal cell lines: a model for study of benzodiazepine action at molecular level (1979)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1979-08-24
    Description: A "recptor unit" for gamma-aminobutyric acid (GABA), which includes brainlike receptor binding sites for tritium-labeled GABA and benzodiazepines (diazepam, clonazepam, and flunitrazepam) and a thermostable endogenous protein (GABA modulin) that inhibits both GABA and benzodiazepine binding, has been demonstrated in membranes prepared from NB2a neuroblastoma and C6 glioma clonal cell lines. In these cells, as in brain, diazepam (1 micromolar) prevents the effect of GABA modulin, and in turn GABA (0.oma and, to a lesser extent, the glioma cells represent a suitable model to study the interactions and the sequence of membrane and intracellular events triggered by the stimulation of benzodiazepine and GABA receptors.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Baraldi, M -- Guidotti, A -- Schwartz, J P -- Costa, E -- New York, N.Y. -- Science. 1979 Aug 24;205(4408):821-3.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/462192" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Benzodiazepines/*metabolism ; Brain/*metabolism ; Cell Line ; Clonazepam/metabolism ; Clone Cells/metabolism ; Diazepam/metabolism/pharmacology ; Flunitrazepam/metabolism ; Membrane Proteins/pharmacology ; Mice ; Nerve Tissue Proteins/pharmacology ; Rats ; Receptors, Drug/*metabolism ; gamma-Aminobutyric Acid/*metabolism
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  • 27
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    Meiotic maturation in Xenopus laevis oocytes initiated by insulin (1979)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1979-09-28
    Description: Insulin can induce meiotic division in Xenopus laevis oocytes. This effect shows the specificity expected of a receptor-mediated mechanism. It is potentiated by ethynylestradiol, a steroid antagonist of pregesterone (the natural hormone that provokes meiosis). The Xenopus laevis oocytes may serve as a model for the study of the poorly understood effect of insulin on cell division.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉El-Etr, M -- Schorderet-Slatkine, S -- Baulieu, E E -- New York, N.Y. -- Science. 1979 Sep 28;205(4413):1397-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/472755" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Calcium/physiology ; Cholera Toxin/pharmacology ; Cycloheximide/pharmacology ; Ethinyl Estradiol/pharmacology ; Female ; Insulin/*pharmacology ; Kinetics ; Meiosis/*drug effects ; Oocytes/*drug effects ; Oogenesis/*drug effects ; Ovum/*drug effects ; Progesterone/pharmacology ; Receptor, Insulin/drug effects ; Xenopus
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  • 28
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    A source of nonshivering thermogenesis in fur seal skeletal muscle (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-04-06
    Description: The mitochondria from the subscapular muscle of naturally cold-stressed 10- to 15-year-old northern fur seals (Callorhinus ursinus) were loosely coupled upon isolation, whereas the mitochondria from the same muscle of warm-acclimated pups of the same age were tightly coupled. Thus, loose-coupled muscle mitochondria might provide an important vehicle for nonshivering thermogenesis in this species.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Grav, H I -- Blix, A S -- New York, N.Y. -- Science. 1979 Apr 6;204(4388):87-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/219477" target="_blank"〉PubMed〈/a〉
    Keywords: Adenine Nucleotides/metabolism ; Animals ; Animals, Suckling ; *Body Temperature Regulation ; Cold Temperature ; Electron Transport Complex IV/metabolism ; Energy Metabolism ; Fur Seals/*physiology ; Kinetics ; Mitochondria, Muscle/physiology ; Muscles/*physiology ; Oxygen Consumption ; Pinnipedia/*physiology
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  • 29
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    Acridine araphanes: a new class of probe molecules for biological systems (1979)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1979-09-21
    Description: The bis-acridine ring system forms the basis for new biophysical probes of novel stereochemistry. Spectral data indicate that certain alkylene bridged bis-9-aminoacridines have a parallel plane conformation of predictable interplane distance. The parallel plane conformation is independent of solvent and thus is different from nucleic acid systems. This stable conformation allows these compounds to be used as sensitive "rulers" for describing binding site geometry in cholinergic enzymes and in the delineation of the mechanism of allosteric control in acetylcholinesterase.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Himel, C M -- Taylor, J L -- Pape, C -- Millar, D B -- Christopher, J -- Kurlansik, L -- New York, N.Y. -- Science. 1979 Sep 21;205(4412):1277-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/472743" target="_blank"〉PubMed〈/a〉
    Keywords: *Acetylcholinesterase/metabolism ; *Acridines ; Binding Sites ; Kinetics ; Molecular Conformation ; Phosphorylation ; Protein Conformation ; Spectrophotometry, Ultraviolet
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  • 30
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    Human and mouse hypoxanthine-guanine phosphoribosyltransferase: dimers and tetramers (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-01-12
    Description: Human and mouse hypoxanthine-guanine phosphoribosyltransferase subunits combine to form an active heteropolymer. Dimers form the basic subunit structure of the enzymes, yet the dimers can readily associate to form tetramers. The equilibrium between dimers and tetramers is significantly influenced by the ionic strength of the enzyme solvent.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Johnson, G G -- Eisenberg, L R -- Migeon, B R -- New York, N.Y. -- Science. 1979 Jan 12;203(4376):174-6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/569362" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Line ; Female ; Genetic Linkage ; Humans ; Hybrid Cells/enzymology ; *Hypoxanthine Phosphoribosyltransferase/genetics ; Macromolecular Substances ; Mice ; Molecular Weight ; Protein Conformation ; X Chromosome
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  • 31
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    Cellular applications of 31P and 13C nuclear magnetic resonance (1979)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1979-07-13
    Description: High-resolution nuclear magnetic resonance (NMR) studies of cells and purified mitochondria are discussed to show the kind of information that can be obtained in vivo. In suspensions of Escherichia coli both phosphorus-31 and carbon-13 NMR studies of glycolysis and bioenergetics are presented. In rat liver cells the pathways of gluconeogenesis from carbon-13-labeled glycerol are followed by carbon-13 NMR. In the intact liver cells cytosolic and mitochondrial pH's were separately measured by phosphorus-31 NMR. In purified mitochondria the internal and external concentrations of inorganic phosphate, adenosine diphosphate, and adenosine triphosphate were determined by phosphorus-31 NMR while the pH difference across the membrane was measured simultaneously.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Shulman, R G -- Brown, T R -- Ugurbil, K -- Ogawa, S -- Cohen, S M -- den Hollander, J A -- New York, N.Y. -- Science. 1979 Jul 13;205(4402):160-6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/36664" target="_blank"〉PubMed〈/a〉
    Keywords: Adenosine Diphosphate/*metabolism ; Adenosine Triphosphate/*metabolism ; Animals ; Carbon Isotopes ; Escherichia coli/metabolism ; Hydrogen-Ion Concentration ; Kinetics ; Liver/metabolism ; Magnetic Resonance Spectroscopy/*methods ; Mitochondria/metabolism ; Phosphates/*metabolism ; Phosphorus Isotopes ; Rats ; Sugar Phosphates/metabolism
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    Cellular interactions uncouple beta-adrenergic receptors from adenylate cyclase (1978)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1978-11-17
    Description: C6 glioma cells and B104 neuroblastoma cells both possess adenylate cyclase activity, but only C6 cells have beta-adrenergic receptors. However, when cocultured with B104 cells, C6 cells show a marked decrease in their ability to accumulate adenosine 3', 5'-monophosphate upon stimulation with beta receptor agonists. Since both beta receptors and cholera toxin-stimulated adenylate cyclase activities are present in C6/B104 cocultures, we conclude that the beta receptor/adenylate cyclase transduction mechanism in cocultured C6 cells is uncoupled.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ciment, G -- de Vellis, J -- New York, N.Y. -- Science. 1978 Nov 17;202(4369):765-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/213832" target="_blank"〉PubMed〈/a〉
    Keywords: Adenylyl Cyclases/*metabolism ; *Cell Communication ; Cell Line ; Cholera Toxin/pharmacology ; Cyclic AMP/metabolism ; Enzyme Activation/drug effects ; Membrane Proteins/metabolism ; Protein Binding ; Receptors, Adrenergic/*metabolism ; Receptors, Adrenergic, beta/*metabolism
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    Rabies viruses increase in virulence when propagated in neuroblastoma cell culture (1978)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1978-03-10
    Description: Several strains of attenuated rabies virus lacking the capacity to kill adult mice acquired a high lethal potential for mice after one to five serial passages in murine or human neuroblastoma cells. The virulence acquired after passage in neuroblastoma cells is a stable genetic trait retained during subsequent passage of viruses in nonneuroblastoma cell systems.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Clark, H F -- New York, N.Y. -- Science. 1978 Mar 10;199(4333):1072-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/628831" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Line ; Cells, Cultured ; Mice ; Neuroblastoma/*microbiology ; Neurons/microbiology ; Rabies Vaccines/toxicity ; Rabies virus/genetics/*pathogenicity ; Vaccines, Attenuated/toxicity ; Virus Replication
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    Estrogen-binding sites in endothelial cell cultures (1978)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1978-09-01
    Description: The cytosol extracted from a vascular endothelial cell line binds [3H]estradiol with high affinity and a high degree of specificity. In contrast, in experiments performed with cytosol labeled in the intact cell, progesterone and, to a smaller extent, testosterone gave an apparent inhibition of estradiol binding. These data support the concept that ovarian hormones may influence the role of the endothelium in various physiological and pathophysiological conditions.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Colburn, P -- Buonassisi, V -- New York, N.Y. -- Science. 1978 Sep 1;201(4358):817-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/684408" target="_blank"〉PubMed〈/a〉
    Keywords: Aorta/*metabolism ; Cell Line ; Cytosol/metabolism ; Diethylstilbestrol/metabolism ; Endothelium/metabolism ; Estradiol/metabolism ; Progesterone/pharmacology ; Receptors, Estrogen/drug effects/*metabolism ; Testosterone/pharmacology
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    The biology of oxygen radicals (1978)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1978-09-08
    Description: The reactive superoxide radical, O2-, formerly of concern only to radiation chemists and radiobiologists, is now understood to be a normal product of the biological reduction of molecular oxygen. An unusual family of enzymes, the superoxide dismutases, protect against the deleterious actions of this radical by catalyzing its dismutation to hydrogen peroxide plus oxygen.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Fridovich, I -- New York, N.Y. -- Science. 1978 Sep 8;201(4359):875-80.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/210504" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Binding Sites ; Catalase/metabolism ; Free Radicals ; Inflammation/metabolism ; Kinetics ; Metals ; Oxidation-Reduction ; Oxygen/*metabolism ; Paraquat/pharmacology ; Peroxidases/metabolism ; Superoxide Dismutase/*metabolism ; Superoxides/*metabolism/toxicity
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    beta-Adrenergic receptors in aged rat brain: reduced number and capacity of pineal gland to develop supersensitivity (1978)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1978-07-07
    Description: The density but not the affinity of beta-adrenergic receptors declined significantly with age in rat pineal gland, corpus striatum, and cerebellum, as determined by the binding of tritiated dihydroalprenolol. Exposing rats to light for 12 hours increased the binding of this radioligand in 3-month-old but not in 24-month-old rats. The reduced responsiveness to catecholamines seen in aging may be due to a decrease in the number of beta-adrenergic receptors which, in turn, may be caused by an impaired capacity of receptors in aged animals to adapt to changes in adrenergic neuronal input.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Greenberg, L H -- Weiss, B -- New York, N.Y. -- Science. 1978 Jul 7;201(4350):61-3.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/208145" target="_blank"〉PubMed〈/a〉
    Keywords: *Aging ; Alprenolol/analogs & derivatives/metabolism ; Animals ; Brain/*metabolism ; Cerebellum/metabolism ; Circadian Rhythm ; Corpus Striatum/metabolism ; Kinetics ; Light ; Male ; Neuroglia/metabolism ; Pineal Gland/*metabolism ; Rats ; Receptors, Adrenergic/*metabolism ; Receptors, Adrenergic, beta/*metabolism
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    Trisodium phosphonoformate, a new antiviral compound (1978)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1978-09-01
    Description: Trisodium phosphonoformate selectively inhibits cell-free DNA polymerase activity induced by herpesvirus. The new inhibitor has an antiviral effect on herpes simplex virus types 1 and 2, pseudorables virus, and infectious bovine rhinotracheitis virus in cell culture. It has a good therapeutic activity against cutaneous herpes simplex virus infection in guinea pigs.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Helgstrand, E -- Eriksson, B -- Johansson, N G -- Lannero, B -- Larsson, A -- Misiorny, A -- Noren, J O -- Sjoberg, B -- Stenberg, K -- Stening, G -- Stridh, S -- Oberg, B -- New York, N.Y. -- Science. 1978 Sep 1;201(4358):819-21.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/210500" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Antiviral Agents/therapeutic use/toxicity ; Cell Line ; DNA-Directed RNA Polymerases/*antagonists & inhibitors ; Formates/pharmacology/toxicity ; Guinea Pigs ; Herpesviridae Infections/drug therapy ; *Nucleic Acid Synthesis Inhibitors ; Organophosphorus Compounds/*pharmacology/toxicity ; Phosphonoacetic Acid/pharmacology ; Simplexvirus/enzymology
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    S-adenosylhomocysteine hydrolase is an adenosine-binding protein: a target for adenosine toxicity (1978)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1978-11-17
    Description: When adenosine deaminase activity is inhibited, low concentrations of adenosine are toxic to human lymphoblast mutants that are unable to convert adenosine to intracellular nucleotides. In order to identify the mediator of this cytotoxicity, we searched for a cytoplasmic protein capable of binding adenosine with high affinity. Such a protein was identified in extracts of human lymphoblasts and placenta as the enzyme S-adenosylhomocysteine hydrolase.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hershfield, M S -- Krodich, N M -- New York, N.Y. -- Science. 1978 Nov 17;202(4369):757-60.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/715439" target="_blank"〉PubMed〈/a〉
    Keywords: Adenosine/*metabolism ; Adenosine Deaminase/*deficiency ; Carrier Proteins/*metabolism ; Female ; Humans ; Hydrolases/*metabolism ; Kinetics ; Lymphocytes/metabolism ; Nucleoside Deaminases/*deficiency ; Placenta/metabolism ; Pregnancy ; S-Adenosylhomocysteine/metabolism
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    Cocaine plasma concentration: relation to physiological and subjective effects in humans (1978)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1978-10-13
    Description: Volunteer subjects with previous histories of cocaine use were administered cocaine hydrochloride intravenously or intranasally. There was a positive relationship between peak plasma concentration, physiological and subjective responses, and dose administered. The rate of cocaine disappearance after intravenous administration paralleled the drop in physiological and subjective drug effects. After intranasal administration, blood levels remained elevated for a considerably longer period.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Javaid, J I -- Fischman, M W -- Schuster, C R -- Dekirmenjian, H -- Davis, J M -- New York, N.Y. -- Science. 1978 Oct 13;202(4364):227-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/694530" target="_blank"〉PubMed〈/a〉
    Keywords: Administration, Intranasal ; Cocaine/administration & dosage/*blood/*pharmacology ; Dose-Response Relationship, Drug ; Euphoria/*drug effects ; Heart Rate/drug effects ; Humans ; Injections, Intravenous ; Kinetics ; Metabolic Clearance Rate
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    Biological activity of some oxygenated sterols (1978)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1978-08-11
    Description: A group of oxygenated sterols has been identified as potent and specific inhibitors of sterol biosynthesis. The ability of these compounds to inhibit sterol synthesis in cultured cells and the ineffectiveness of cholesterol under the same conditions suggest that feedback regulation of sterol biosynthesis may be brought about by an oxygenated sterol rather than by cholesterol. The nature of the regulatory sterol may vary in different cells with their specific requirements for cholesterol as a structural component or as a precursor of other steroid products. The use of oxygenated sterols to block sterol synthesis in cultured cells provides new information regarding the role of sterol in cell membrane structure and function. For example, de novo sterol synthesis is required for DNA synthesis and cell division by some cultured cells. Studies with cultured cells, and with rats and mice in vivo, suggest that oxygenated sterols could be of value in the treatment of several important human diseases.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kandutsch, A A -- Chen, H W -- Heiniger, H J -- New York, N.Y. -- Science. 1978 Aug 11;201(4355):498-501.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/663671" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Brain/metabolism ; Cell Division ; Cell Line ; Cholesterol/biosynthesis/*metabolism ; Feedback ; Humans ; Hydroxycholesterols/*metabolism ; Hydroxymethylglutaryl CoA Reductases/metabolism ; Intestines/metabolism ; Ketosteroids/*metabolism ; Liver/metabolism
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    Enhancement of oncogenesis in C3H/10T1/2 mouse embryo cell cultures by saccharin (1978)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1978-09-22
    Description: Impure and pure samples of saccharin (2 milligrams per milliliter) did not produce oncogenic transformation of C3H/10T1/2, clone 8, mouse embryo fibroblasts. However, after treatment of the cells with a nontransforming initiating dose (0.1 microgram per milliliter) of 3-methylcholanthrene, continuous treatment with either sample of saccharin (100 micrograms per milliliter) led to significant transformation. It is concluded that in this system saccharin is a cocarginogen, probably functioning as a promoting agent that is 1000-fold less active than the tumor promoter 12-O-tetradecanoyl-phorbol-13-acetate.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Mondal, S -- Brankow, D W -- Heidelberger, C -- New York, N.Y. -- Science. 1978 Sep 22;201(4361):1141-2.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/684434" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Carcinogens ; Cell Line ; Cell Transformation, Neoplastic/*chemically induced ; Cocarcinogenesis ; Embryo, Mammalian ; Methylcholanthrene ; Mice ; Mice, Inbred C3H ; Saccharin/*pharmacology ; Tetradecanoylphorbol Acetate
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    Far-ultraviolet stopped-flow circular dichroism (1978)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1978-01-27
    Description: A stopped-flow circular dichroism instrument, with a total accessible wavelength range of 200 to 750 nanometers, has been constructed and provides a spectroscopic method for kinetic investigations of a wide array of fast reactions in which optical activity changes in absorbing regions are involved. An important biochemical application depends on the far-ultraviolet capability, which allows observation of the rapid alterations in backbone conformation associated with folding and unfolding reactions of proteins. Results obtained by following two such reactions at 222 nanometers represent direct monitoring by circular dichroism of rapid secondary structure changes in proteins.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Luchins, J -- Beychok, S -- New York, N.Y. -- Science. 1978 Jan 27;199(4327):425-6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/619462" target="_blank"〉PubMed〈/a〉
    Keywords: *Circular Dichroism ; Hemoglobins ; Kinetics ; Methemoglobin ; *Protein Conformation ; Protein Denaturation ; Spectrophotometry, Ultraviolet/methods ; *Spectrum Analysis
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    Growth inhibition of transformed cells with succinylated concanavalin A (1978)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1978-09-01
    Description: Succinylated concanavalin A reversibly inhibits the growth of SV40 transformed mouse 3T3 cells and thus causes an accumulation of the cells in the G1 phase of the cell cycle. In a soft substrate (methylcellulose) succinylated concanavalin A also restores in transformed cells the growth behavior typical of untransformed cells.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Mannino, R J -- Ballmer, K -- Burger, M M -- New York, N.Y. -- Science. 1978 Sep 1;201(4358):824-6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/210502" target="_blank"〉PubMed〈/a〉
    Keywords: Cell Adhesion/drug effects ; Cell Cycle/*drug effects ; Cell Line ; Cell Transformation, Neoplastic/*drug effects ; Concanavalin A/*analogs & derivatives/pharmacology ; Simian virus 40 ; Succinates
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    Generation of new mouse sarcoma viruses in cell culture (1978)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1978-09-01
    Description: Endogenous nontumor-producing type C viruses from C3H mice were used to generate rapid, solid tumor-inducing variants in cell culture. The new mouse sarcoma viruses induce undifferentiated sarcomas with a short latency period upon inoculation into newborn NIH Swiss mice. Transforming viruses appear only transiently, at a time when the virus-infected cells show morphologic alterations; both before and after this time, transforming viruses cannot be detected. These results show that variants of endogenous type C virus which contain transforming genes (oncogenes) can arise during spread of the endogenous virus in fibroblast lines in vitro as well as in susceptible tissues in vivo.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Rapp, U R -- Todaro, C -- New York, N.Y. -- Science. 1978 Sep 1;201(4358):821-4.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/210501" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Line ; *Cell Transformation, Neoplastic ; Cell Transformation, Viral ; *Genes, Viral ; Mice ; Retroviridae/genetics/*pathogenicity ; Sarcoma Viruses, Murine/genetics/pathogenicity ; Sarcoma, Experimental/*microbiology
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    Jaundice phototherapy: micro flow-cell photometry reveals rapid biliary response of Gunn rats to light (1978)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1978-09-01
    Description: Hepatic pigment clearance in rats can be followed continuously with photometric detectors designed for high-pressure liquid chromatography. This method showed that light has a fast effect on bilirubin metabolism in homozygous Gunn rats, even at low doses and intensities. This is consistent with geometric isomerization of bilirubin IXalpha as a primary step in phototherapy.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉McDonagh, A F -- Ramonas, L M -- New York, N.Y. -- Science. 1978 Sep 1;201(4358):829-31.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/581101" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Bile/metabolism ; Bilirubin/blood/*metabolism/radiation effects ; *Disease Models, Animal ; Humans ; Infant, Newborn ; Jaundice, Neonatal/*therapy ; Kinetics ; Liver/metabolism ; *Phototherapy ; Rats
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    Enhancement of bovine pancreatic ribonuclease activity by mercaptoethanol (1978)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1978-03-10
    Description: Incubation of ribonuclease with 0.1M mercaptoethanol at pH 8.5 can increase the enzyme's hydrolytic activity toward cytidine 2',3'-monophosphate (cyclic CMP) under standard assay conditions. Cation-exchange chromatography of the ribonuclease-thiol reaction mixture revealed seven fractions. The fraction with the highest activity had an approximate tenfold decrease in the apparent Michaelis constant for cyclic CMP with respect to native ribonuclease. The enhanced activity is a metastable property since this fraction reverts back to the control activity and chromatographic behavior of native ribonuclease on standing in solution at room temperature.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Watkins, J B -- Benz, F W -- New York, N.Y. -- Science. 1978 Mar 10;199(4333):1084-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/564548" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cattle ; Disulfides/pharmacology ; Enzyme Activation/drug effects ; Glutathione/pharmacology ; Kinetics ; Mercaptoethanol/*pharmacology ; Oxidation-Reduction ; Pancreas/enzymology ; Protein Conformation ; Ribonucleases/*metabolism ; Structure-Activity Relationship
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    Antibody diversity (1978)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1978-10-06
    Description: Three important aspects of immunoglobulin gene organization and structure have emerged from studies of cloned immunoglobulin kappa chain genes. (i) Multiple variable genes are encoded separately in the genome of both immunoglobulin-producing and uncommitted (embryonic) cells, thereby establishing the evolutionary base for generating immunoglobulin diversity. (ii) These genes exist as many small, closely related families (subgroups) that share close sequence homology largely within their own subgroup. (iii) Comparison of two cloned variable gene segments derived from a single subgroup reveals a feature of their structure that distinguishes them from fixed genes (that is, globin genes) and provides, through extensive surrounding sequence homology, a large target for intergenic recombination. This last observation suggests that a simple recombination mechanism may account for their genetic instability in both germ line and somatic cells.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Seidman, J G -- Leder, A -- Nau, M -- Norman, B -- Leder, P -- New York, N.Y. -- Science. 1978 Oct 6;202(4363):11-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/99815" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Antibody Specificity ; Base Sequence ; Binding Sites, Antibody/*genetics ; Biological Evolution ; Cell Line ; Embryo, Mammalian/immunology ; *Genes ; Immunoglobulin Constant Regions/*genetics ; Immunoglobulin Light Chains/*genetics ; Immunoglobulin Variable Region/*genetics ; Immunoglobulin kappa-Chains/*genetics ; Immunoglobulins/*genetics ; Mice ; Neoplasms, Experimental/immunology ; Plasmacytoma/immunology ; Recombination, Genetic
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    Presynaptic alpha-receptor subsensitivity after long-term antidepressant treatment (1978)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1978-10-20
    Description: After 3 weeks of twice-daily administration of desipramine to rats, the frequency-response curve for field stimulation of adrenergic neurons in isolated left atrial strips was shifted markedly to the left and the efflux of [3H]norepinephrine was enhanced greatly. After 1 day of treatment, only slight shifts in the frequency-response curve and small increases in [3H]norepinephrine efflux occurred although inhibition of [3H]norepinephrine uptake was already maximal, and phenoxybenzamine caused a further shift to the left in the frequency-response curve similar to that which occurred after 3 weeks of desipramine treatment alone. A gradual decrease in the sensitivity of the presynaptic alpha receptor would explain the delay in the onset of the linical effect of the tricyclic antidepressants.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Crews, F T -- Smith, C B -- New York, N.Y. -- Science. 1978 Oct 20;202(4365):322-4.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/211589" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Desipramine/*pharmacology ; In Vitro Techniques ; Kinetics ; Neuromuscular Junction/drug effects ; Norepinephrine/*metabolism/pharmacology ; Phenoxybenzamine/pharmacology ; Rats ; Receptors, Adrenergic/*drug effects ; Receptors, Adrenergic, alpha/*drug effects ; Receptors, Adrenergic, beta/drug effects ; Synaptic Membranes/drug effects ; Synaptic Transmission/*drug effects ; Time Factors
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    Potassium activation associated with intraneuronal free calcium (1978)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1978-04-28
    Description: Relations between calcium entry and activation of a calcium-dependent outward current during depolarization were examined under voltage clamp in dorid giant neurons injected with the calcium-sensitive photoprotein aequorin. Activation kinetics and amplitude of the slow calcium-dependent component were both found to be related to the rate and extent of free calcium accumulation and to the electromotive force acting on potassium ions, independent of the calcium activation kinetics. This indicates that the activation of the calcium-dependent outward current is more closely related to the transient intracellular accumulation of free calcium ions than to the movement of calcium through the plasma membrane during depolarization.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Eckert, R -- Tillotson, D -- New York, N.Y. -- Science. 1978 Apr 28;200(4340):437-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/644308" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Calcium/*metabolism ; In Vitro Techniques ; Kinetics ; Membrane Potentials ; Mollusca ; Neurilemma/physiology ; Neurons/*metabolism ; Potassium/*metabolism
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  • 50
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    Stimulated DNA synthesis in frog nuclei by cytoplasmic extracts of temperature-sensitive mammalian cells (1978)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1978-08-18
    Description: Cytoplasmic extracts of proliferating cells stimulate DNA synthesis in isolated nuclei of Xenopus laevis liver. When tested by the same assay, cytoplasmic extracts of resting cells are completely inactive. When cytoplasmic extracts are prepared from cell cycle-specific temperature-sensitive mutants arrestd in the G1 phase of the cell cycle by the nonpermissive temperature, they also fail to stimulate DNA synthesis in frog nuclei. The results indicate that, to stimulate DNA synthesis in isolated frog nuclei, essentially all information of G1 cells must be present.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Floros, J -- Chang, H -- Baserga, R -- New York, N.Y. -- Science. 1978 Aug 18;201(4356):651-2.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/675253" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Cell Cycle ; Cell Line ; Cell Nucleus/*metabolism ; Chickens ; Cytoplasm/physiology ; DNA/*biosynthesis ; Liver/ultrastructure ; Mutation ; Temperature ; Xenopus
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  • 51
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    Entry of insulin into human cultured lymphocytes: electron microscope autoradiographic analysis (1978)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1978-11-17
    Description: Electron microscope autoradiographs were prepared of IM-9 human cultured lymphocytes incubated with iodine-125-labeled insulin. With the use of [125I]insulin and Ilford L-4 emulsion, the technique had a resolution half-distance of approximately 0.085 micrometer. Autoradiographs revealed a time-dependent entry of insulin into the cell interior that was maximal after 30 minutes of incubation. At this time point nearly 40 percent of the [125I]insulin was in the interior of the cell at a distance 1 micrometer or greater from the plasma membrane. Grain distribution and volume density analyses revealed that the intracellular insulin was concentrated in the endoplasmic reticulum and nuclear membrane.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Goldfine, I D -- Jones, A L -- Hradek, G T -- Wong, K Y -- Mooney, J S -- New York, N.Y. -- Science. 1978 Nov 17;202(4369):760-3.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/715440" target="_blank"〉PubMed〈/a〉
    Keywords: Autoradiography ; Biological Transport ; Cell Nucleus/metabolism ; Cells, Cultured ; Endoplasmic Reticulum/metabolism ; Humans ; Insulin/*metabolism ; Kinetics ; Lymphocytes/*metabolism
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  • 52
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    Intracellular translocation of iodine-125-labeled insulin: direct demonstration in isolated hepatocytes (1978)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1978-05-19
    Description: Insulin labeled with iodine-125 binds to receptors on isolated rat hepatocytes. At low temperatures initial binding is restricted to the plasma membrane as detected by direct quantitative autoradiographic analysis with the electron microscope. With increasing time and temperature of incubation there is a systematic and progressive translocation of autoradiographic grains to a highly limited area of the cell periphery representing no more than 15% of the radius of the cell.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gorden, P -- Carpentier, J L -- Freychet, P -- LeCam, A -- Orci, L -- New York, N.Y. -- Science. 1978 May 19;200(4343):782-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/644321" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Membrane/metabolism ; Endocytosis ; Insulin/*metabolism ; Kinetics ; Liver/*metabolism/ultrastructure ; Lymphocytes/metabolism ; Lysosomes/metabolism ; Molecular Weight ; Rats ; Receptor, Insulin/*metabolism
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  • 53
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    Slow axonal transport of neurofilament proteins: impairment of beta,beta'-iminodipropionitrile administration (1978)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1978-11-10
    Description: beta,beta'-Iminodipropionitrile (IDPN) administration prevented normal slow axonal transport of [35S]methionine- or [3H]leucine-labeled proteins in rat sciatic motor axons. Ultrastructural and electrophoretic studies showed that the neurofilament triplet proteins in particular were retained within the initial 5 millimeters of the axons, resulting in neurofilament-filled axonal swellings. Fast anterograde and retrograde axonal transport were not affected. The IDPN thus selectively impaired slow axonal transport. The neurofibrillary pathology in this model is the result of the defective slow transport of neurofilaments.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Griffin, J W -- Hoffman, P N -- Clark, A W -- Carroll, P T -- Price, D L -- New York, N.Y. -- Science. 1978 Nov 10;202(4368):633-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/81524" target="_blank"〉PubMed〈/a〉
    Keywords: Axonal Transport/*drug effects ; Kinetics ; Molecular Weight ; Nerve Tissue Proteins/*metabolism ; Neurofibrils/metabolism/ultrastructure ; Nitriles/*pharmacology/toxicity ; Sciatic Nerve/metabolism
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  • 54
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    Rod-cone dysplasia in Irish setters: a defect in cyclic GMP metabolism in visual cells (1978)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1978-09-22
    Description: An abnormality in retinal guanosine 3,5-monophosphate (cyclic GMP) metabolism is demonstrated in the inherited rod-cone dysplasis of Irish Setter dogs. Affected visual cells are deficient in cyclic GMP phosphodiesterase activity and have elevated levels of cyclic GMP. The biochemical abnormalities observed in affected retinas of Irish Setters are similar to those in the retinas of mice with inherited retinal degeneration before visual cell degeneration begins. A defect in cyclic GMP metabolism may be characteristic of early-onset degenerative diseases of the retina, possibly including those that affect humans.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Aquirre, G -- Farber, D -- Lolley, R -- Fletcher, R T -- Chader, G J -- New York, N.Y. -- Science. 1978 Sep 22;201(4361):1133-4.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/210508" target="_blank"〉PubMed〈/a〉
    Keywords: 3',5'-Cyclic-GMP Phosphodiesterases/*deficiency ; Animals ; Cell Differentiation ; Chromosome Aberrations/genetics/metabolism/pathology/veterinary ; Chromosome Disorders ; Cyclic GMP/*metabolism ; Dog Diseases/genetics/*metabolism/pathology ; Dogs ; Kinetics ; Mice ; Photoreceptor Cells/metabolism/pathology ; Retina/enzymology/*metabolism/pathology ; Retinal Degeneration/genetics/metabolism/pathology/*veterinary
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  • 55
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    Muscle crossbridge stroke and activity revealed by optical diffraction (1978)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1978-03-17
    Description: Optical diffraction measurements during rapid releases of active toad muscle show that the sarcomeres contract within 1 millisecond by an amount up to but not greater than 12 nanometers. This crossbridges immediately start cycling to produce the normal contraction velocity in unloaded muscle.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Barden, J A -- Mason, P -- New York, N.Y. -- Science. 1978 Mar 17;199(4334):1212-3.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/415364" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Bufo marinus ; In Vitro Techniques ; Kinetics ; Lasers ; *Muscle Contraction ; Muscles/*ultrastructure ; Scattering, Radiation ; Tendons/physiology
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  • 56
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    Models for the specific adhesion of cells to cells (1978)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1978-05-12
    Description: A theoretical framework is proposed for the analysis of adhesion between cells or of cells to surfaces when the adhesion is mediated by reversible bonds between specific molecules such as antigen and antibody, lectin and carbohydrate, or enzyme and substrate. From a knowledge of the reaction rates for reactants in solution and of their diffusion constants both in solution and on membranes, it is possible to estimate reaction rates for membrane-bound reactants. Two models are developed for predicting the rate of bond formation between cells and are compared with experiments. The force required to separate two cells is shown to be greater than the expected electrical forces between cells, and of the same order of magnitude as the forces required to pull gangliosides and perhaps some integral membrane proteins out of the cell membrane.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bell, G I -- New York, N.Y. -- Science. 1978 May 12;200(4342):618-27.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/347575" target="_blank"〉PubMed〈/a〉
    Keywords: Antigen-Antibody Reactions ; *Cell Adhesion ; Cell Membrane/physiology ; Chemistry, Physical ; Electrophysiology ; Enzymes/physiology ; Glycoproteins/physiology ; Kinetics ; Ligands ; Membrane Proteins/physiology ; *Models, Biological ; Physicochemical Phenomena ; Receptors, Drug/physiology
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  • 57
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    Light stimulates tyrosine hydroxylase activity and dopamine synthesis in retinal amacrine neurons (1978)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1978-11-24
    Description: Retinal dopamine-containing amacrine neurons are rapidly activated by light, as shown by an increase in the rate of dopamine formation in vivo and a concomitant increase in the activity of tyrosine hydroxylase, measured in vitro with a subsaturating concentration of pteridine cofactor. Activation of tyrosine hydroxylase also occurs when isolated eyes from rats killed in the dark are exposed to a strobe light. Studies of amacrine neurons should provide basic data about the biochemical processing of visual information, as well as the physiological presynaptic regulatory mechanisms of dopamine-containing neurons.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Iuvone, P M -- Galli, C L -- Garrison-Gund, C K -- Neff, N H -- New York, N.Y. -- Science. 1978 Nov 24;202(4370):901-2.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/30997" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Circadian Rhythm ; Dopamine/*biosynthesis ; Enzyme Activation/radiation effects ; Kinetics ; *Light ; Male ; Neurons/metabolism ; Rats ; Retina/cytology/enzymology/*metabolism ; Tyrosine 3-Monooxygenase/*biosynthesis
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    Polypeptide hormones: what are they doing in cells? (1978)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1978-09-08
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kolata, G B -- New York, N.Y. -- Science. 1978 Sep 8;201(4359):895-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/210505" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antigen-Antibody Reactions ; Biological Transport ; Cells/*metabolism ; Chorionic Gonadotropin/metabolism ; Epidermal Growth Factor/metabolism ; Hormones/*metabolism ; Insulin/metabolism ; Kinetics ; Peptides/*metabolism ; Receptor, Insulin/immunology ; Receptors, Cell Surface/*metabolism
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  • 59
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    Magnetic microspheres prepared by redox polymerization used in a cell separation based on gangliosides (1978)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1978-06-02
    Description: A facile method is described for making magnetic microspheres that bind specifically to cell surfaces, in order to separate cells magnetophoretically. Control over the sizes of the spheres is effected by using their magnetic cores as part of a redox polymerization system. The use of the microspheres is demonstrated with a separation involving C-1300 neuroblastoma cells, 10% of which express the ganglioside GM1 in their membranes. The GM1-containing cells were separated with better than 99% purity, while the deficient cells were obtained at least 98% pure. The separation, which was carried out under sterile conditions, required only 6 minutes.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kronick, P L -- Campbell, G L -- Joseph, K -- New York, N.Y. -- Science. 1978 Jun 2;200(4345):1074-6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/653356" target="_blank"〉PubMed〈/a〉
    Keywords: Cell Line ; Cell Separation/*methods ; *Gangliosides ; Magnetics ; Microspheres ; Neoplasms, Experimental/pathology ; Neuroblastoma/pathology ; Oxidation-Reduction
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  • 60
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    Rapid changes in brain benzodiazepine receptors after experimental seizures (1978)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1978-11-24
    Description: Seizures induced in the rat by electroshock or by injections of pentylenetetrazol increase the specific binding of diazepam to putative receptor sites in cerebral cortical membranes. The enhancement of diazepam binding results from a rapid increase in the number of available binding sites rather than a change in receptor affinity. The postictal increase in cortical benzodiazepine receptors suggests that the cerebral cortex might be more sensitive to the anticonvulsant effects of the benzodiazepines after seizures. This observation may be related to the mechanism of action of these drugs in the treatment of recurrent seizures such as status epilepticus.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Paul, S M -- Skolnick, P -- New York, N.Y. -- Science. 1978 Nov 24;202(4370):892-4.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/715447" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Anoxia/metabolism ; Binding Sites ; Brain/*metabolism ; Cerebral Cortex/metabolism ; Diazepam/*metabolism ; Electroshock ; Kinetics ; Male ; Pentylenetetrazole ; Rats ; Receptors, Drug/*metabolism ; Seizures/*metabolism ; Synaptosomes/metabolism
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  • 61
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    Histamine H1 receptor-mediated guanosine 3',5'-monophosphate formation by cultured mouse neuroblastoma cells (1978)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1978-07-07
    Description: Incubation of cultured mouse neuroblastoma cells with histamine caused a rapid and marked increase in the formation of guanosine 3',5'-monophosphate (cyclic GMP) by these cells. Receptor agonists for H1, but not H2, caused this effect which was reduced by H1 but not by H2 or muscarinic acetylcholine receptor antagonists. These results indicate that activation of H1 receptors in these cultured nerve cells stimulated cyclic GMP formation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Richelson, E -- New York, N.Y. -- Science. 1978 Jul 7;201(4350):69-71.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26974" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Calcium/pharmacology ; Carbachol/pharmacology ; Cell Line ; Cyclic GMP/*metabolism ; Histamine/*pharmacology ; Histamine H1 Antagonists/pharmacology ; Mice ; Neuroblastoma ; Neurons/*drug effects/metabolism ; Receptors, Histamine/*drug effects ; Receptors, Histamine H1/*drug effects
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  • 62
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    Myosin: immunofluorescent localization in neuronal and glial cultures (1978)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1978-03-31
    Description: The distribution of intracellular myosin was studied by the double antibody immunofluorescence method in primary organotypic neuronal cultures and two established neuronal and glial cell lines. An array of parallel filaments aligned with the major cellular axis and a three-dimensional subsurface network were shown to react with two different myosin antibodies. The presence of myosin-rich filaments in regions known to contain actin filaments suggests that these proteins interact to generate the motive force in nonmuscle contractile systems.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Roisen, F -- Inczedy-Marcsek, M -- Hsu, L -- Yorke, W -- New York, N.Y. -- Science. 1978 Mar 31;199(4336):1445-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/343252" target="_blank"〉PubMed〈/a〉
    Keywords: Cell Line ; Cytoplasm/ultrastructure ; Fluorescent Antibody Technique ; Ganglia, Spinal/cytology ; Myosins/*metabolism ; Neuroglia/*metabolism/ultrastructure ; Neurons/*metabolism/ultrastructure
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    Highly reiterated sequences of SIMIANSIMIANSIMIANSIMIANSIMIAN (1978)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1978-04-28
    Description: A 172-base pair segment of DNA that is repeated several million times in the genome of the African green monkey has been characterized. Sequence analysis revealed that the many repeats of this complex unit are not all identical but represent a set of closely related segments: Sequence divergence occurs at various positions in the segment in a nonrandom manner. The uncloned segment obtained from monkey DNA is compared with a cloned segment of the same DNA which was recombined into the genome of simian virus 40 during permissive infection.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Rosenberg, H -- Singer, M -- Rosenberg, M -- New York, N.Y. -- Science. 1978 Apr 28;200(4340):394-402.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/205944" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Base Sequence ; Biological Evolution ; Cell Line ; Cercopithecus/*genetics ; Cercopithecus aethiops/*genetics ; DNA/*genetics ; DNA Restriction Enzymes ; DNA, Recombinant ; Haplorhini ; Molecular Weight ; Recombination, Genetic ; Simian virus 40/genetics
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    Sickling rates of human AS red cells infected in vitro with Plasmodium falciparum malaria (1978)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1978-11-10
    Description: The kinetics of sickling of malaria-infected red cells from humans with sickle cell trait were studied in vitro in an attempt to obtain direct experimental evidence for a selective advantage of the hemoglobin S heterozygote in a malarious region. The sickling rates of cells infected with Plasmodium falciparum and of non-infected cells were studied both in the total absence of oxygen (by dithionite addition) and at several different concentrations of oxyhemoglobin which might obtain in vivo. In all cases, red cells containing small plasmodium parasite forms (ring forms) sickled approximately eight times as readily as uninfected cells. Cells containing large parasitic forms (trophozoites and schizonts) appeared to sickle less readily than uninfected cells, by light microscopy criteria, but electron micrographs demonstrated the presence of polymerized deoxyhemoglobin S with a high frequency. It is concluded that enhanced sickling of plasmodium-infected AS cells may be one mechanism whereby the hemoglobin S polymorphism is balanced in favor of the heterozygote.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Roth, E F Jr -- Friedman, M -- Ueda, Y -- Tellez, I -- Trager, W -- Nagel, R L -- New York, N.Y. -- Science. 1978 Nov 10;202(4368):650-2.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/360396" target="_blank"〉PubMed〈/a〉
    Keywords: Anemia, Sickle Cell/*parasitology ; Erythrocytes, Abnormal/*parasitology ; Heterozygote ; Humans ; Kinetics ; Malaria/*blood ; Plasmodium falciparum ; Sickle Cell Trait/parasitology
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    Time-resolved resonance raman spectroscopy of hemoglobin derivatives: heme structure changes in 7 nanoseconds (1978)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1978-09-01
    Description: Resonance Raman spectra of oxyhemoglobin, deoxyhemoglobin, carboxyhemoglobin, and the corresponding myoglobin derivatives have been obtained with 7-nanosecond laser pulses at 531.8 nanometers. The results suggest that no transient constraint of the heme group by the globin structure occurs on this time scale, and thus establish a temporal sequence for the early events that may participate in the stereochemical trigger mechanism of hemoglobin cooperativity.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Woodruff, W H -- Farquharson, S -- New York, N.Y. -- Science. 1978 Sep 1;201(4358):831-3.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/684409" target="_blank"〉PubMed〈/a〉
    Keywords: Allosteric Regulation ; Carboxyhemoglobin ; *Heme ; *Hemoglobins ; Kinetics ; Myoglobin ; Oxyhemoglobins ; Spectrum Analysis, Raman
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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    Human breast cancer: androgen action mediated by estrogen receptor (1978)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1978-02-17
    Description: Growth of the human breast cancer cell line MCF-7 is enhanced by androgens, but only at pharmacological concentrations. Although physiological concentrations of androgens translocate the androgen receptor into the nucleus, no mitogenic effects are observed. By contrast, pharmacological androgens translocate not only the androgen receptor but also the estrogen receptor, and at these high doses significantly increase both DNA and estrogen-dependent protein synthesis. We therefore propose that androgens stimulate MCF-7 cell growth not through the androgen receptor but rather through the estrogen receptor.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Zava, D T -- McGuire, W L -- New York, N.Y. -- Science. 1978 Feb 17;199(4330):787-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/622569" target="_blank"〉PubMed〈/a〉
    Keywords: Androgens/*pharmacology ; Breast Neoplasms/*metabolism ; Cell Line ; Cell Nucleus/drug effects/metabolism ; Cytoplasm/drug effects/metabolism ; Dihydrotestosterone/pharmacology ; Humans ; Receptors, Androgen/drug effects ; Receptors, Estrogen/drug effects/*physiology ; Receptors, Glucocorticoid/drug effects/metabolism ; Receptors, Progesterone/drug effects/metabolism ; Stimulation, Chemical ; Translocation, Genetic
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    Tumor promoters inhibit morphological differentiation in cultured mouse neuroblastoma cells (1978)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1978-05-05
    Description: When added to mouse neuroblastoma cultures, the potent tumor promoter 12-O-tetradecanoyl-phorbol-13-acetate (TPA) inhibits spontaneous neurite formation as well as that induced in response to serum deprivation, prostaglandin E1, 5-bromo-2'-deoxyuridine, and papaverine. Other tumor-promoting macrocyclic plant diterpenes also inhibit neurite formation, whereas nonpromoting diterpenes do not. Inhibition by TPA was reversible and was unrelated to toxicity.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ishii, D N -- Fibach, E -- Yamasaki, H -- Weinstein, I B -- New York, N.Y. -- Science. 1978 May 5;200(4341):556-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/644318" target="_blank"〉PubMed〈/a〉
    Keywords: Bromodeoxyuridine/antagonists & inhibitors ; Cell Differentiation/drug effects ; Cell Line ; Diterpenes/pharmacology ; Dose-Response Relationship, Drug ; Neuroblastoma/pathology ; Neurons/*cytology ; Papaverine/antagonists & inhibitors ; Phorbols/*pharmacology ; Prostaglandins E/antagonists & inhibitors ; Tetradecanoylphorbol Acetate/*pharmacology
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    Subpicosecond spectroscopy of bacteriorhodopsin (1978)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1978-06-16
    Description: Subpicosecond pulses have been used to study the ultrafast dynamics of the photochemistry of bacteriorhodopsin. An optically induced absorption that appears in about 1.0 picosecond at physiological temperatures has been resolved in time. The data can be interpreted in terms of the photochemical formation of bathobacteriorhodopsin and provide support for an excitation mechanisms involving molecular rearrangement in the protein induced by electron redistribution in the chromophore.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ippen, E P -- Shank, C V -- Lewis, A -- Marcus, M A -- New York, N.Y. -- Science. 1978 Jun 16;200(4347):1279-81.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/663607" target="_blank"〉PubMed〈/a〉
    Keywords: *Bacteriorhodopsins ; Biological Transport, Active ; *Carotenoids ; Halobacterium ; Kinetics ; Lasers ; Photochemistry ; Protons ; Spectrum Analysis ; Temperature
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  • 69
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    Tumor-promoting phorbol esters inhibit binding of epidermal growth factor to cellular receptors (1978)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1978-10-20
    Description: Tumor-promoting phorbol esters and related plant macrocyclic diterpenes inhibit the binding of epidermal growth factor to its receptors on HeLa cells. This effect shows marked structural specificity and correlates with other biological effects of these compounds on mouse skin and in cell culture systems. The active compounds inhibited binding of 125I-labeled epidermal growth factor with a 50 per-cent effective dose in the range of 10(-8) to 10(-9) M. Inhibition appears to be due to a decrease in the number of available epidermal growth factor receptors rather than a change in receptor affinity. These results suggest that certain biologic effects of tumor promoters may result from alterations in the function of cell surface receptors involved in growth regulation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lee, L S -- Weinstein, I B -- New York, N.Y. -- Science. 1978 Oct 20;202(4365):313-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/308698" target="_blank"〉PubMed〈/a〉
    Keywords: Binding, Competitive ; Cell Membrane/metabolism ; Epidermal Growth Factor/*metabolism ; HeLa Cells ; Kinetics ; Peptides/*metabolism ; Phorbol Esters/*metabolism/pharmacology ; Phorbols/*metabolism ; Receptors, Drug/drug effects/*metabolism ; Tetradecanoylphorbol Acetate/metabolism
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  • 70
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    Chick embryonic skin as a rapid organ culture assay for cellular neoplasia (1978)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1978-03-03
    Description: We used chick embryonic skin (CES) in organ culture to assess the neoplastic potential of a variety of cultured human and nonhuman cell lines. Cells derived from cancer tissues grew in CES and formed tumors in nude mice while cells derived from normal tissues grew in neither system. The CES proved to be more sensitive than the nude mouse when used to assay SV40 transformed human cells; each of four such lines grew in CES while only one of the four lines grew and formed tumors in nude mice. In addition, the patterns of invasion by inoculated cells can be easily studied in the CES. These results suggest that CES in organ culture offers an inexpensive, rapid, and reliable alternative to the nude mouse as a tumorigenicity test.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Noguchi, P D -- Johnson, J B -- O'Donnell, R -- Petricciani, J C -- New York, N.Y. -- Science. 1978 Mar 3;199(4332):980-3.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/203036" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Division ; Cell Line ; Cell Survival ; *Cell Transformation, Neoplastic ; *Chick Embryo/metabolism ; Mice ; Mice, Nude ; Mitosis ; Neoplasm Invasiveness ; Neoplasms/*metabolism/pathology ; *Organ Culture Techniques ; Simian virus 40 ; Skin/*embryology/metabolism/pathology
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    Histidine transfer RNA levels in Friend leukemia cells: stimulation by histidine deprivation (1978)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1978-08-11
    Description: Friend leukemia cells incubated with sublethal concentrations of histidinol for 5 to 6 days show up to twofold increases in their relative concentrations of histidine transfer RNA and no change in the relative concentrations of leucine transfer RNA. A similar effect is seen when cells are grown to stationary phase in the presence of 0.2 times the amount of histidine in Eagle's minimum essential medium. These observations support the theory that the concentrations of specific transfer RNA's are regulated by a mechanism that is sensitive to the extent of their aminoacylation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Litt, M -- Weiser, K -- New York, N.Y. -- Science. 1978 Aug 11;201(4355):527-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/248241" target="_blank"〉PubMed〈/a〉
    Keywords: Cell Division ; Cell Line ; Histidine/metabolism ; Histidine-tRNA Ligase/antagonists & inhibitors ; Histidinol/pharmacology ; Leucine/metabolism ; RNA, Transfer/*metabolism ; RNA, Transfer, Amino Acyl/*metabolism
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    Fasting decreases triiodothyronine receptor capacity (1978)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1978-02-10
    Description: Fasting decreases the ratio of hepatic nuclear to serum triiodothyronine (T3) by diminishing the binding capacity of nuclear T3 receptors. In combination with the lower serum T3 concentration caused by fasting, the decrease in receptor content results in a marked decrease in nuclear T3-receptor complexes. The changes in T3 receptor content and circulating T3 in fasted animals appear to be independent synergistic adaptations for caloric conservation in the fasted state. Unlike changes in hormonal level, the modification of nuclear receptor content provides a mechanism that may protect cells with a low caloric reserve independently of the metabolic status of the whole animal.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Schussler, G C -- Orlando, J -- New York, N.Y. -- Science. 1978 Feb 10;199(4329):686-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/204004" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Nucleus/metabolism ; *Fasting ; Female ; Kinetics ; Liver/*metabolism ; Rats ; Receptors, Cell Surface/*metabolism ; Triiodothyronine/blood/*metabolism
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    The glycosylation of hemoglobin: relevance to diabetes mellitus (1978)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1978-04-07
    Description: Glucose reacts nonenzymatically with the NH2-terminal amino acid of the beta chain of human hemoglobin by way of a ketoamine linkage, resulting in the formation of hemoglobin AIc. Other minor components appear to be adducts of glucose 6-phosphate and fructose 1,6-diphosphate. These hemoglobins are formed slowly and continuously throughout the 120-day life-span of the red cell. There is a two- to threefold increase in hemoglobin AIc in the red cells of patients with diabetes mellitus. By providing an integrated measurement of blood glucose, hemoglobin AIc is useful in assessing the degree of diabetic control. Furthermore, this hemoglobin is a useful model of nonenzymatic glycosylation of other proteins that may be involved in the long-term complications of the disease.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bunn, H F -- Gabbay, K H -- Gallop, P M -- New York, N.Y. -- Science. 1978 Apr 7;200(4337):21-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/635569" target="_blank"〉PubMed〈/a〉
    Keywords: Blood Glucose/metabolism ; Chemical Phenomena ; Chemistry ; Diabetes Complications ; Diabetes Mellitus/*blood/diagnosis ; Diphosphoglyceric Acids/blood ; Glycosides/blood ; Glycosuria/etiology ; Hemoglobin A/*metabolism ; Hemoglobins/*analysis/*metabolism ; Humans ; Kinetics ; Oxygen/blood ; Structure-Activity Relationship
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  • 74
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    Pressure-adaptive differences in lactate dehydrogenases of congeneric fishes living at different depths (1978)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1978-07-21
    Description: The muscle-type (M4) lactate dehydrogenases of Sebastolobus altivelis, a deep-water scorpaenid, and S. alascanus, a shallower species, are electrophoretically indistinguishable, yet differ in pressure sensitivities. The lactate dehydrogenase of S. altivelis exhibits lower pressure sensitivities of substrate and coenzyme binding and catalytic rate. Such apparently pressure-adaptive kinetic properties may be important for establishing species depth zonation patterns in the ocean.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Siebenaller, J -- Somero, G N -- New York, N.Y. -- Science. 1978 Jul 21;201(4352):255-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/208149" target="_blank"〉PubMed〈/a〉
    Keywords: *Adaptation, Biological ; Animals ; Biological Evolution ; Fishes/*physiology ; *Hydrostatic Pressure ; Isoenzymes ; Kinetics ; L-Lactate Dehydrogenase/*metabolism ; Muscles/enzymology ; NAD/metabolism ; *Pressure ; Pyruvates/metabolism ; Species Specificity ; Temperature
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  • 75
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    Membrane enzymes: artifacts in Arrhenius plots due to temperature dependence of substrate-binding affinity (1978)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1978-02-24
    Description: For the membrane sodium-stimulated magnesium-adenosinetriphosphatase of Acholeplasma laidlawii B both the Vmax and Km values in the Michaelis equation very strongly with temperature. Simulations of Arrhenius plots show that an enzyme with a temperature-dependent Km can yield a variety of Arrhenius plot artifacts, most notably erroneous "breaks," if activity is assayed at a fixed substrate concentration.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Silvius, J R -- Read, B D -- McElhaney, R N -- New York, N.Y. -- Science. 1978 Feb 24;199(4331):902-4.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/146257" target="_blank"〉PubMed〈/a〉
    Keywords: Acholeplasma laidlawii/enzymology ; Adenosine Triphosphatases/*metabolism ; Adenosine Triphosphate/metabolism ; Fatty Acids/pharmacology ; Kinetics ; Magnesium/metabolism ; Membrane Proteins/metabolism ; Membranes/*enzymology ; Temperature ; Thermodynamics
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    Regulation of macrophage tumoricidal function: a role for prostaglandins of the E series (1978)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1978-10-20
    Description: Exogenously added prostaglandins E1 and E2, but not F2alpha, inhibited the tumoricidal activity of interferon-activated macrophages of mice. A role for adenosine 3',5'-monophosphate (cyclic AMP) in modulating macrophage functional activity was suggested because prostaglandins of the E series increase intracellular concentrations of cyclic AMP in macrophages and because treatment of interferon-activated macrophages with dibutyryl cyclic AMP consistently inhibits expression of cytotoxicity. Since the activated macrophage releases high concentrations of prostaglandin E2, it is postulated that this prostaglandin could act locally in negative feedback inhibition to limit cell activities.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Schultz, R M -- Pavlidis, N A -- Stylos, W A -- Chirigos, M A -- New York, N.Y. -- Science. 1978 Oct 20;202(4365):320-1.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/694537" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Line ; Cytotoxicity, Immunologic/drug effects ; Immunity, Cellular/*drug effects ; Interferons/*antagonists & inhibitors ; Macrophages/*immunology ; Male ; Mice ; Neoplasms, Experimental/*immunology ; Nucleotides, Cyclic/pharmacology ; Prostaglandins E/*pharmacology ; Prostaglandins F/pharmacology
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  • 77
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    L-Dopa methyl ester: prolongation of survival of neuroblastoma-bearing mice after treatment (1978)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1978-02-17
    Description: L-Dopa has has been shown to demonstrate enhanced toxicity toward melanoma cells in vitro. Since melanocytes arise from the neural crest embryologically, the effect of L-dopa methyl ester, a soluble analog, on the murine C1300 neuroblastoma was studied. There was significant antitumor activity against the neuroblastoma, which was enhanced by combination with a dopa decarboxylase inhibitor, Ro4-4602. In vitro studies suggested inhibition of DNA synthesis as the principal site of action. A mechanism involving sulfhydryl compound scavenging is postulated.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wick, M M -- New York, N.Y. -- Science. 1978 Feb 17;199(4330):775-6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/622565" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Benserazide/pharmacology ; Cell Line ; Drug Synergism ; Leucine/metabolism ; Levodopa/*analogs & derivatives/pharmacology/therapeutic use ; Male ; Mice ; Neoplasms, Experimental/drug therapy/metabolism ; Neuroblastoma/*drug therapy/metabolism ; Thymidine/metabolism ; Uridine/metabolism
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    Saccharin-induced sister chromatid exchanges in Chinese hamster and human cells (1978)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1978-05-05
    Description: Since the induction of sister chromatid exchanges in cultured cells has been shown to be the most sensitive mammalian system to detect the effects of mutagenic carcinogens, Chinese hamster ovary cells and human lymphocytes were exposed to the sodium saccharin found to induce bladder cancer in rats. Both that saccharin and a highly purified extract of it increased the yield of sister chromatid exchanges in both types of cells. The results, which were repeatable and statistically highly significant, indicated that the weak carcinogen, saccharin, is also mutagenic in the sense that it induces cytogenetic changes.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wolff, S -- Rodin, B -- New York, N.Y. -- Science. 1978 May 5;200(4341):543-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/644315" target="_blank"〉PubMed〈/a〉
    Keywords: Cell Line ; Chromatids/*drug effects ; Crossing Over, Genetic/*drug effects ; Dose-Response Relationship, Drug ; HeLa Cells ; Saccharin/*pharmacology
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    Production of antibody to tetanus toxoid by continuous human lymphoblastoid cell lines (1978)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1978-03-31
    Description: Peripheral lymphocytes from human volunteers boosted with tetanus toxoid were cultured after in vitro infection with Epstein-Barr virus. Forty-four continuous lymphoblastoid lines were established which continued to secrete human gamma globulin; seven of these secreted antibody to tetanus toxoid. Subcultures derived from limiting dilution experiments continued to secrete the antibody. Some of these antibody-secreting cells have been in continuous culture for more than 6 months.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Zurawski, V R Jr -- Haber, E -- Black, P H -- New York, N.Y. -- Science. 1978 Mar 31;199(4336):1439-41.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/204013" target="_blank"〉PubMed〈/a〉
    Keywords: Antibody Formation ; Antibody Specificity ; Cell Line ; Clone Cells/immunology ; Herpesvirus 4, Human ; Histological Techniques ; Humans ; Lymphocytes/*immunology ; *Tetanus Antitoxin ; *Tetanus Toxoid
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  • 80
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    Dopaminergic inhibition of adrenergic neurotransmission as a model for studies on dopamine receptor mechanisms (1978)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1978-01-27
    Description: Dopamine and apomorphine produced concentration-dependent inhibition of adrenergic neurotransmission in the isolated, perfused, rabbit ear artery. The inhibitory action of both dopamine and apomorphine was competitively antagonized by haloperidol and several other antipsychotic drugs. The calculated affinities of these drugs for the dopaminergic receptor correlate closely with both the pharmacological potencies of these drugs in vivo and their reported potencies as inhibitors of [3H]haloperidol binding to "dopamine receptors" in brain homogenates.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Steinsland, O S -- Hieble, J P -- New York, N.Y. -- Science. 1978 Jan 27;199(4327):443-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22933" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antipsychotic Agents/*pharmacology ; Apomorphine/pharmacology ; Dopamine/*pharmacology ; Ear/blood supply ; Haloperidol/pharmacology ; Kinetics ; Neuromuscular Junction/drug effects ; Norepinephrine/metabolism ; Rabbits ; Receptors, Dopamine/*drug effects ; Synaptic Transmission/*drug effects ; Vasoconstriction/drug effects
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    Immunofluorescent detection of nuclear double-stranded RNA in situ in Vero and mosquito cells (1978)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1978-06-23
    Description: Double-stranded RNA (dsRNA) was detected in situ by indirect immunofluorescence with antibodies to dsRNA. It was seen in nuclei of Vero and Aedes albopictus cells, but not in BHK cells, KB cells, chick embryo fibroblasts, or HeLa cells. Reactive dsRNA was present in the nucleoplasm, but not in nucleoli or cytoplasm. Extracted RNA from the whole cell contained from 0.08 percent (BHK) to 0.46 percent (HeLa) dsRNA, as estimated by serological methods. This dsRNA, found in molecules having the size distribution of heterogeneous nuclear RNA, did not renature rapidly after denaturation. The quantity of dsRNA in total extracted RNA did not correlate with the presence or absence of nuclear staining in situ.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Stollar, B D -- Koo, R -- Stollar, V -- New York, N.Y. -- Science. 1978 Jun 23;200(4348):1381-3.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26972" target="_blank"〉PubMed〈/a〉
    Keywords: Cell Line ; Cell Nucleolus/analysis ; Cell Nucleus/*analysis ; Culicidae ; Cytoplasm/analysis ; Fluorescent Antibody Technique ; Nucleic Acid Conformation ; RNA/*analysis
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