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  • Cell Line  (35)
  • Structure-Activity Relationship  (35)
  • American Association for the Advancement of Science (AAAS)  (69)
  • American Association of Petroleum Geologists (AAPG)
  • International Union of Crystallography
  • Taylor & Francis
  • 1975-1979  (69)
Collection
Keywords
Publisher
  • American Association for the Advancement of Science (AAAS)  (69)
  • American Association of Petroleum Geologists (AAPG)
  • International Union of Crystallography
  • Taylor & Francis
Years
Year
  • 1
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    Comparative biochemistry and drug design for infectious disease (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-09-07
    Description: In the past two decades, biochemistry and molecular biology have demonstrated the existence of potentially exploitable biochemical differences between etiologic agents of disease and their hosts. Known differences between organism and host with respect to metabolism and polymer structure point to the detailed characterization of key proteins as the focus for the development of potential inhibitors. In the last decade, the methodology of the isolation, characterization, and inactivation of proteins and enzymes has been advanced. The present scientific and technological base suggests that new efforts toward the development of selective chemotherapeutic agents for infections caused by bacteria, viruses, protozoa, and higher eukaryotes should exploit the known differences in proteins or other specific biopolymers serving crucial structural or metabolic roles in the economy of the parasite.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Cohen, S S -- New York, N.Y. -- Science. 1979 Sep 7;205(4410):964-71.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/382357" target="_blank"〉PubMed〈/a〉
    Keywords: *Anti-Bacterial Agents ; *Antiviral Agents ; Communicable Diseases/*drug therapy ; Humans ; Mycobacterium leprae/metabolism ; Polysaccharides, Bacterial/metabolism ; Species Specificity ; Structure-Activity Relationship ; Trypanosomiasis/drug therapy ; Vidarabine/pharmacology ; Viral Proteins/biosynthesis ; Virus Replication/drug effects
    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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    Amino acid sequence homology between histone H5 and murine leukemia virus phosphoprotein p12 (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-03-30
    Description: The amino terminal acid sequences of several mouse leukemia virus phosphoproteins (p12) show definite homology with the amino terminal conserved region of H5 histones, the phosphorylated nuclear proteins of nucleated erythrocytes. Differences in the amino acid compositions of the two groups of proteins seem to rule out the possibility that they evolved from a single common ancestral gene. The finding of sequence homology between viral p12's and cellular histones, however, is consistent with evolution of retrovirus structural proteins by a process of differentiation from preexisting cellular genes. The conserved primary and secondary structure at the amino terminal region, common to both groups of proteins, may be related to their common function of nucleic acid binding modulated by phosphorylation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Henderson, L E -- Gilden, R V -- Oroszlan, S -- New York, N.Y. -- Science. 1979 Mar 30;203(4387):1346-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/218289" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Carrier Proteins ; Cell Nucleus/analysis ; Chickens/blood ; Erythrocytes/analysis ; Geese/blood ; *Histones ; Leukemia Virus, Murine/*analysis ; Nucleic Acids/metabolism ; *Phosphoproteins ; Structure-Activity Relationship ; *Viral Proteins
    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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  • 3
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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
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  • 4
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    Digitalis genin activity: side-group carbonyl oxygen position is a major determinant (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-08-31
    Description: The Na+,k+-adenosine triphosphatase-inhibiting activity of digitalis genins and their analogs is a function of side-group carbonyl (C = O) oxygen position. For each 2.2 angstroms that this oxygen is displaced from its position in digitoxigenin, activity drops by one order of magnitude. This quantitative relation resolves previously proposed models which have attempted to describe the molecular basis of genin activity. A multidisciplinary (crystallographic, conformational energy, synthetic, biological) approach to structure-activity relations is described.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Fullerton, D S -- Yoshioka, K -- Rohrer, D C -- From, A H -- Ahmed, K -- New York, N.Y. -- Science. 1979 Aug 31;205(4409):917-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/224455" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Brain/enzymology ; Digitalis Glycosides/*pharmacology ; Molecular Conformation ; Rats ; Sodium-Potassium-Exchanging ATPase/*antagonists & inhibitors ; Structure-Activity Relationship
    Print ISSN: 0036-8075
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 5
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    Specific nonopiate receptors for beta-endorphin (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-09-07
    Description: Iodinated beta H-[2-D-alanine]endorphin exhibits specific binding to cultured human lymphocytes. The binding is inhibited by low concentrations of beta-endorphin and its D-alanine derivative, but is not affected by opiate agonists and antagonists, or by enkephalin analogs, beta-lipotropin, adrenocorticotrophic hormone, or alpha-melanocyte-stimulating hormone; this suggests the existence of a specific, non-opiate binding site (receptor) for beta-endorphin. The carboxy-terminal region of beta-endorphin is essential for this binding activity, since alpha-endorphin is not active. beta-Endorphin may be a circulating hormone with peripheral physiological effects that are not primarily mediated through interactions with opiate or enkephalin receptors.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hazum, E -- Chang, K J -- Cuatrecasas, P -- New York, N.Y. -- Science. 1979 Sep 7;205(4410):1033-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/224457" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Cells, Cultured ; Endorphins/blood/*metabolism ; Humans ; Lymphocyte Activation ; Lymphocytes/*metabolism ; Receptors, Drug/*metabolism ; Receptors, Opioid/metabolism ; Stress, Physiological/metabolism ; Structure-Activity Relationship
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 6
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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
    Print ISSN: 0036-8075
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  • 7
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    Heterogeneity of vertebrate luteinizing hormone-releasing hormone (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-10-05
    Description: Radioimmunoassay and chromatography analyses of hypothalamic luteinizing hormone-releasing hormone (LHRH) have demonstrated the presence of LHRH-like immunoreactive peptides in a wide range of vertebrates. Contrary to previous reports, the molecule differs in various vertebrates. Avian, reptilian, and teleostean LHRH's are chemically distinct from the mammalian peptide but are in themselves indistinguishable. However, amphibian LHRH appears to be identical to the mammalian peptide. These findings have interesting evolutionary implications.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉King, J A -- Millar, R P -- New York, N.Y. -- Science. 1979 Oct 5;206(4414):67-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/384514" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Biological Evolution ; Chromatography ; Gonadotropin-Releasing Hormone/*analysis/immunology ; Hypothalamus/analysis ; Radioimmunoassay ; Species Specificity ; Structure-Activity Relationship
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  • 8
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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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  • 9
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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
    Print ISSN: 0036-8075
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 10
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    N-acetyl gramicidin: single-channel properties and implications for channel structure (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-01-05
    Description: Substitution of a methyl group for the N-terminal hydrogen of gramicidin greatly increased the rate of dissociation of conductive channels in lipid bilayer membranes. The finding of short lifetimes for conductive channels, comparable to those seen for the neuromuscular junction, lends support to the head-to-head dimer structure for the conductive channel.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Szabo, G -- Urry, D W -- New York, N.Y. -- Science. 1979 Jan 5;203(4375):55-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/83000" target="_blank"〉PubMed〈/a〉
    Keywords: Cations, Monovalent ; Electric Conductivity ; *Gramicidin ; *Ion Channels ; Membranes, Artificial ; Models, Biological ; Structure-Activity Relationship
    Print ISSN: 0036-8075
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  • 11
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    Elimination of metabolic cooperation in Chinese hamster cells by a tumor promoter (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-11-30
    Description: Wild-type Chinese hamster V79 cells (6-thioguanine-sensitive) reduce the recovery of 6-thioguanine-resistant cells when they are cultured together at high densities, through a form of intercellular communication (metabolic cooperation). Cooperation is inhibited by 12-O-tetradecanoyl phorbol-13-acetate, rescuing the 6-thioguanine-resistant cells. These results may be useful in the study of an aspect of the mechanism of tumor promotion and in assaying for promoters.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Yotti, L P -- Chang, C C -- Trosko, J E -- New York, N.Y. -- Science. 1979 Nov 30;206(4422):1089-91.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/493994" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Communication/*drug effects ; Cell Membrane/drug effects ; Cricetinae ; Dose-Response Relationship, Drug ; Drug Resistance ; Phorbol Esters/*pharmacology ; Phorbols/*pharmacology ; Structure-Activity Relationship ; Tetradecanoylphorbol Acetate/pharmacology ; Thioguanine/pharmacology
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  • 12
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    Sporozoite-induced malaria: therapeutic effects of glycolipids in liposomes (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-09-14
    Description: Liposomes containing neutral glycolipids with a terminal glucose or galactose, when injected intravenously, prevented the appearance of erythrocytic forms of malaria (Plasmodium berghei) in mice previously injected with sporozoites. Inhibitory glycolipids included glucosyl, galactosyl, or lactosyl ceramide. Inhibition was not observed with liposomes containing ceramide, phosphocholine ceramide, sulfogalactosyl ceramide (sulfatide), or ganglioside GM1. Liposomes containing glycolipids did not inhibit infection transmitted by injecting blood containing erythrocytic stages of malaria. These results may have therapeutic implications in the treatment of malaria. Analysis of the mechanism of interference with the life cycle of malaria by liposomal glycolipids may yield information about the interactions of parasites with cellular membranes.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Alving, C R -- Schneider, I -- Swartz, G M Jr -- Steck, E A -- New York, N.Y. -- Science. 1979 Sep 14;205(4411):1142-4.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/382358" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Ceramides/therapeutic use ; Erythrocytes/parasitology ; Glycolipids/*therapeutic use ; Liposomes/therapeutic use ; Liver/parasitology ; Malaria/parasitology/*therapy ; Mice ; Plasmodium berghei ; Structure-Activity Relationship
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 13
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    Physical factors affecting the mutagenicity of fly ash from a coal-fired power plant (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-05-25
    Description: The two finest, most respirable coal fly ash fractions collected from the smokestack of a power plant were more mutagenic than two coarser fractions. Mutagenicity was evaluated in the histidine-requiring bacterial strains TA 1538, TA 98, and TA 100 of Salmonella typhimurium. Ash samples collected from the hoppers of an electrostatic precipitator in the plant were not mutagenic. The mutagens in coal fly ash were resistant to x-ray or ultraviolet irradiation, possibly as a result of stabilization by fly ash surfaces. All mutagenic activity is lost with heating to 350 degrees C.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Fisher, G L -- Chrisp, C E -- Raabe, O G -- New York, N.Y. -- Science. 1979 May 25;204(4395):879-81.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/375394" target="_blank"〉PubMed〈/a〉
    Keywords: Air Pollutants/*toxicity ; Carcinogens ; Coal ; Hot Temperature ; Industry ; *Mutagens ; *Power Plants ; Radiation Effects ; Salmonella typhimurium/drug effects ; Structure-Activity Relationship
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  • 14
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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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  • 15
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    Space-filling models of kinase clefts and conformation changes (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-04-27
    Description: Space-filling models of yeast hexokinase, adenylate kinase, and phosphoglycerate kinase drawn by computer clearly portray the bilobal character of these phosphoryl transfer enzymes, and the deep cleft which is formed between the lobes. A dramatic conformational change occurs in hexokinase as glucose binds to the bottom of the cleft, which causes the two lobes of hexokinase to come together. A substrate-induced closing of the active site cleft is postulated to occur in other kinases as well. This change may provide a mechanism by which some of these enzymes reduce their inherent adenosine triphosphatase activity and could be a general requirement of the kinase reaction.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Anderson, C M -- Zucker, F H -- Steitz, T A -- New York, N.Y. -- Science. 1979 Apr 27;204(4391):375-80.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/220706" target="_blank"〉PubMed〈/a〉
    Keywords: Adenylate Kinase ; Binding Sites ; Catalysis ; Hexokinase ; Models, Molecular ; Phosphoglycerate Kinase ; *Phosphotransferases ; Protein Conformation ; Saccharomyces cerevisiae/enzymology ; Structure-Activity Relationship
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  • 16
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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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  • 17
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    Selective phospholipid adsorption and atherosclerosis (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-05-04
    Description: Disaturated (fully saturated) lecithins adsorb onto solid surfaces more readily than lecithins in which one or both fatty acids are unsaturated. If saturated lecithins adsorb to arterial walls as they do to glass and polystyrene surfaces, there may be increased probability of atherosclerosis when the disaturated lecithin content of plasma is elevated. Analyses of lecithins in plasma samples from patients with myocardial infarction, and from patients with premature atherosclerosis but with low concentrations of plasma cholesterol and triglycerides, are consistent with the hypothesis that a high concentration of disaturated lecithin in plasma may be a significant risk factor for atherosclerosis, independent of triglyceride and cholesterol concentrations.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gershfeld, N L -- New York, N.Y. -- Science. 1979 May 4;204(4392):506-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/581915" target="_blank"〉PubMed〈/a〉
    Keywords: Adsorption ; Adult ; Aged ; Arteriosclerosis/blood/*etiology ; Coronary Disease/*blood ; Fatty Acids, Unsaturated ; Female ; Humans ; Male ; Middle Aged ; Myocardial Infarction/blood ; *Phosphatidylcholines/blood ; Pulmonary Surfactants/blood ; Structure-Activity Relationship ; Temperature
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  • 18
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    A synthetic pentapeptide with biological activity characteristic of the thymic hormone thymopoietin (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-06-22
    Description: The pentapeptide arginyl-lysyl-aspartyl-valyl-tyrosine, corresponding to amino acid residues 32--36 in thymopoietin, was synthesized. In vitro, this pentapeptide induced the differentiation of murine prothymocytes to thymocytes and inhibited differentiative induction of cells of the B lineage. This combination of actions is presently unique to the parent molecule thymopoietin. In vivo, the pentapeptide reduced the high numbers of autologous rosette-forming cells normally present in the spleens of athymic mice; this also is a property of thymopoietin. These results suggest that this readily synthesized pentapeptide corresponds to an active site of thymopoietin and might serve as a therapeutic substitute for thymopoietin.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Goldstein, G -- Scheid, M P -- Boyse, E A -- Schlesinger, D H -- Van Wauwe, J -- New York, N.Y. -- Science. 1979 Jun 22;204(4399):1309-10.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/451537" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Antigens, Surface/analysis ; Cell Differentiation/drug effects ; Complement System Proteins ; Isoantigens/analysis ; Lymphocytes/cytology/*immunology ; Mice ; Mice, Nude/immunology ; Oligopeptides/chemical synthesis/*pharmacology ; Receptors, Drug/analysis ; Structure-Activity Relationship ; Thymopoietins/*pharmacology ; Thymus Hormones/*pharmacology
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  • 19
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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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  • 20
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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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  • 21
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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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  • 22
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    Genetic effects of impure and pure saccharin in yeast (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-09-07
    Description: Yeast cells were grown in media containing impure or purified saccharin preparations. Dose-dependent increases in frequencies of cells possessing aberrant cell morphologies were revealed by light microscopy. At each test dose, cells grown in impure saccharin exhibited up to sevenfold higher frequencies of mitotic crossing-over or gene conversion in three of four assays for genetic recombination than cells grown in purified saccharin from the same lot. With one exception, the sweetener produced by the Maumee process caused larger increases in recombination and gene reversion than the sweetener produced by the Remsen-Fahlberg process. The several test markers did not respond equally to any test saccharin. Cells grown in liquid media containing no saccharin or two of three test concentrations of saccharin produced cell titers that were approximately equivalent.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Moore, C W -- Schmick, A -- New York, N.Y. -- Science. 1979 Sep 7;205(4410):1007-10.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/382356" target="_blank"〉PubMed〈/a〉
    Keywords: Cell Division/drug effects ; Crossing Over, Genetic/drug effects ; Dose-Response Relationship, Drug ; Mitosis/drug effects ; *Mutagens ; Recombination, Genetic/drug effects ; Saccharin/chemical synthesis/*pharmacology ; Saccharomyces cerevisiae/*drug effects ; Structure-Activity Relationship
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  • 23
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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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  • 24
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    Human macrophage migration inhibition factor: evidence for subunit structure (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    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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  • 25
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    Differential competition with cytotoxic agents: an approach to selectivity in cancer chemotherapy (1979)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1979-11-30
    Description: An approach to increasing the selectivity of cancer chemotherapeutic agents is presented in which noncytotoxic competitive substrates are used to discern the differences in structural requirements for transport of cytotoxic agents between tumor cells and a sensitive host tissue, the hematopoietic precursor cells of the bone marrow. Examples are given for two such systems, one responsible for the transport of nucleosides and another for the transport of amino acids. Cytidine is twice as effective in reducing the toxicity of showdomycin for murine bone marrow cells in culture as it is for murine L1210 leukemia cella. Conversely, homoleucine is twice as effective in reducing the toxicity of melphalan for L1210 cells as it is for bone marrow cells. These observations can serve as a basis for the development of bone marrow protective agents and for the design of cytotoxic agents that may be preferentially transported into tumor cells.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Rabinowitz, M -- Uehara, Y -- Vistica, D T -- New York, N.Y. -- Science. 1979 Nov 30;206(4422):1085-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/493993" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antibiotics, Antineoplastic/*metabolism ; Biological Transport ; Bone Marrow/drug effects ; Leukemia L1210/drug therapy ; Melphalan/metabolism/therapeutic use ; Mice ; Neoplasms/*drug therapy ; Showdomycin/*metabolism/therapeutic use ; Structure-Activity Relationship
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  • 26
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    Induction of differentiation in human promyelocytic leukemia cells by tumor promoters (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    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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  • 27
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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)
    Details
    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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  • 28
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    Effect of fluorine substitution on the agonist specificity of norepinephrine (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-06-15
    Description: Substitution of fluorine for hydrogen in position 2, 5, or 6 of the aromatic ring of norepinephrine markedly alters the alpha- and beta-adrenergic agonist properties of norephinephrine. The 6-fluoro isomer is an beta-adrenergic agonist with virtually no beta agonist activity, while the 2-fluoro isomer is a beta-adrenergic agonist with little alpha activity. The 5-fluoro isomer is equipotent with norepinephrine as an alpha agonist and significantly more potent as a beta agonist. The possible physiochemical basis for these differences is discussed.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Cantacuzene, D -- Kirk, K L -- McCulloh, D H -- Creveling, C R -- New York, N.Y. -- Science. 1979 Jun 15;204(4398):1217-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/221978" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Aorta ; Fluorine ; Guinea Pigs ; Hydrogen Bonding ; In Vitro Techniques ; Norepinephrine/*analogs & derivatives/chemical synthesis/pharmacology ; Receptors, Adrenergic/*drug effects ; Receptors, Adrenergic, alpha/*drug effects ; Receptors, Adrenergic, beta/*drug effects ; Structure-Activity Relationship
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  • 29
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    Partially modified retro-inverso-enkephalinamides: topochemical long-acting analogs in vitro and in vivo (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-06-15
    Description: The synthesis of four enkephalinamide analogs is described in which the peptide bond between residues 4 and 5 is reversed with or without simultaneous reversal of the carboxyl-terminal amide bond. These so-called partially modified retro-inverso-isomers are new, potent, topochemical analogs of the enkephalins. Tests, both in vitro and in vivo, have shown that these analogs are considerably longer acting than any previously studied enkephalins. Thus, partial reversal of the peptide bonds of the backbone can result in peptides with enhanced activity compared to a parent compound, provide that the structural complementarity of both the side chains and end groups are conserved.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chorev, M -- Shavitz, R -- Goodman, M -- Minick, S -- Guillemin, R -- New York, N.Y. -- Science. 1979 Jun 15;204(4398):1210-2.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/451565" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Behavior, Animal/drug effects ; Brain/drug effects ; Endorphins/*pharmacology ; Enkephalins/chemical synthesis/metabolism/*pharmacology ; Rats ; Structure-Activity Relationship
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  • 30
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    Heparin: an old drug with a new paradigm (1979)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1979-11-02
    Description: Recent studies have shown that heparin is a biochemical representative of a distinct class of compounds known as linear anionic polyelectrolytes. Members of this class are mixtures of individual highly negatively charged chains that show a wide spectrum of specific reactions with biologically active proteins. Upon administration, heparin chains enter a cellular pool and effectively prevent thrombosis by increasing the electronegative potential of the vessel wall. Anticoagulant activity is an unusual feature of a few heparin chains and appears to play a minor role in many clinical uses and in physiological and pathological responses.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Jacques, L B -- New York, N.Y. -- Science. 1979 Nov 2;206(4418):528-33.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/386509" target="_blank"〉PubMed〈/a〉
    Keywords: Antithrombin III/metabolism ; Blood Coagulation/drug effects ; Heparin/adverse effects/*pharmacology/therapeutic use ; Humans ; Ions ; Mast Cells/physiology ; Structure-Activity Relationship ; Sulfates/metabolism ; Thrombosis/prevention & control
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  • 31
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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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  • 32
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    Inhibition of mast cell histamine secretion by N-substituteed derivatives of phosphatidylserine (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-05-11
    Description: The structural basis for the highly specific action of phosphatidylserine in enhancing mast cell histamine secretion induced by concanavalin A was investigated by studying the activities of three N-substituted derivatives: N-acetyl phosphatidylserine, N-1-dimethylaminonaphthalene-5-sulfonly phosphatidylserine, and N-4-nitrobenzo-2-oxa-1,3-diazole phosphatidylserine. None of the derivatives was capable of activating concanavalin A-induced histamine secretion at concentrations two to three times that required for maximal activation by phosphatidylserine. Instead, the derivatives were found to inhibit the secretory response of mast cells to the calcium ionophore A23187 as well as to concanavalin A. The inhibition was noncytotoxic, partially reversible by washing, and associated with binding of N-substituted phosphatidylserine to the mast cell.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Martin, T W -- Lagunoff, D -- New York, N.Y. -- Science. 1979 May 11;204(4393):631-3.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/86210" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Membrane/drug effects ; Exocytosis/drug effects ; Histamine Release/*drug effects ; Mast Cells/*drug effects ; Phosphatidylserines/*pharmacology ; Rats ; Structure-Activity Relationship
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    Liposomes and local hyperthermia: selective delivery of methotrexate to heated tumors (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-04-13
    Description: Liposomes with phase transitions a few degrees above physiological temperature delivered more than four times as much methotrexate to murine tumors heated to 42 degrees C as to unheated control tumors. Most of the accumulated drug appeared to be intracellular and bound to dihydrofolate reductase, the enzyme blocked by methotrexate in its role as an antineoplastic agent.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Weinstein, J N -- Magin, R L -- Yatvin, M B -- Zaharko, D S -- New York, N.Y. -- Science. 1979 Apr 13;204(4389):188-91.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/432641" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Hot Temperature ; Liposomes/*therapeutic use ; Male ; Metabolic Clearance Rate ; Methotrexate/*administration & dosage/metabolism ; Mice ; Neoplasms, Experimental/*drug therapy ; Phospholipids ; Structure-Activity Relationship
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    Cellular interactions uncouple beta-adrenergic receptors from adenylate cyclase (1978)
    American Association for the Advancement of Science (AAAS)
    Details
    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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  • 36
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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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  • 37
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    Dual actions of substance P on nociception: possible role of endogenous opioids (1978)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1978-03-24
    Description: Substance P produces analgesia when administered to mice in very small doses by the intraventricular route (1.25 to 5 nanograms per mouse). The analgesic effect can be blocked by naloxone. At higher doses (greater than 50 nanograms per mouse), this activity is lost. At these higher doses, however, substance P produced hyperalgesia when combined with naloxone and analgesia when combined with baclofen [beta-(4-chlorophenyl)-gamma-aminobutyric acid]. Substance P may have dual actions in brain, releasing endorphins at very low doses and directly exciting neuronal activity in nociceptive pathways at higher doses.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Frederickson, R C -- Burgis, V -- Harrell, C E -- Edwards, J D -- New York, N.Y. -- Science. 1978 Mar 24;199(4335):1359-62.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/204012" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Baclofen/pharmacology ; Dose-Response Relationship, Drug ; Endorphins/*pharmacology ; Enkephalins/antagonists & inhibitors/*pharmacology ; Mice ; Naloxone/pharmacology ; Nociceptors/*drug effects ; Receptors, Opioid/*drug effects ; Structure-Activity Relationship ; Substance P/analogs & derivatives/antagonists & inhibitors/*pharmacology
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    Peptides in the brain: the new endocrinology of the neuron (1978)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1978-10-27
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Guillemin, R -- New York, N.Y. -- Science. 1978 Oct 27;202(4366):390-402.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/212832" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Endorphins/*history/isolation & purification/pharmacology ; Gonadotropin-Releasing Hormone/isolation & purification ; Growth Hormone-Releasing Hormone/isolation & purification ; History, 20th Century ; Hypothalamic Hormones/*history/pharmacology ; Hypothalamo-Hypophyseal System/*physiology ; *Neurosecretion ; Sheep ; Species Specificity ; Structure-Activity Relationship ; Synaptic Transmission ; Thyrotropin-Releasing Hormone/isolation & purification/physiology
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  • 39
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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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    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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  • 41
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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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  • 42
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    Growth inhibition of transformed cells with succinylated concanavalin A (1978)
    American Association for the Advancement of Science (AAAS)
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    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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    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)
    Details
    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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    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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    Photoejection of electrons from flavins in polar media (1978)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1978-08-18
    Description: Riboflavin and 12 of its derivatives have been shown to form solvated electrons under ultraviolet irradiation (253.7 nanometers) in various water-methanol solvent mixtures. The highest quantum yield of solvated electrons (about 0.03) was obtained for flavins containing tyrosine on a side chain in the isoalloxazine N-3 or N-10 position. The splitting of hydrogen atoms from excited flavin molecules was also observed. From the results presented here, it can be determined that the semiquinone transients are formed not only by way of the flavin triplet, as usually suggested, but also by the attack of the electrons and hydrogen atoms on flavin molecules in the ground state. This is important, because the flavin radicals remaining after the electron-ejection or hydrogen-splitting processes must also be considered in the subsequent reaction mechanisms. The electron-ejection process from electronically excited flavins has important implications in the photobiology of these compounds.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Getoff, N -- Solar, S -- New York, N.Y. -- Science. 1978 Aug 18;201(4356):616-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/675244" target="_blank"〉PubMed〈/a〉
    Keywords: Electrons ; Methanol ; Oxidation-Reduction ; Photochemistry ; Riboflavin/*analogs & derivatives/*radiation effects ; Solvents ; Structure-Activity Relationship ; *Ultraviolet Rays ; Water
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    Another flame retardant, tris-(1,3-dichloro-2-propyl)-phosphate, and its expected metabolites are mutagens (1978)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1978-05-19
    Description: A flame retardant used in children's sleepwear, tris-(1,3-dichloro-2-propyl)phosphate (Fyrol FR2) is a mutagen in the Salmonella-mammalian tissue homogenate test after it has been activated by mouse or rat liver homogenate. The expected enzymatic hydrolysis product, 1,3-dichloro-2-propanol, is similarly a mutagen after activation by liver homogenate. A proposed metabolite of the flame retardant, 1,3-dichloro-2-propanone, is a potent mutagen in the absence of such activation. A flame retardant with similar structure, tris-(2,3-dibromopropyl)phosphate (tris-BP), was shown previously to be a mutagen, to cause sterility in animals, to be a carcinogen, and to be absorbed through human skin. These and other flame retardants have characteristic nuclear magnetic resonance spectra that can be used to determine which flame retardant is present in commercially purchased sleepwear. Sleepwear treated with tris-BP, Fyrol FR2, and other chemical additives was being sold in late 1977.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gold, M D -- Blum, A -- Ames, B N -- New York, N.Y. -- Science. 1978 May 19;200(4343):785-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/347576" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Biotransformation ; Flame Retardants/*toxicity ; Hydrocarbons, Chlorinated/toxicity ; Liver/metabolism ; Mice ; *Mutagens ; Organophosphorus Compounds/*toxicity ; Salmonella typhimurium/drug effects ; Structure-Activity Relationship
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    Channel structures of gramicidin: characterization of succinyl derivatives (1978)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1978-04-28
    Description: Succinyl derivatives of gramicidin were tested for their ability to form channels in planar artificial lipid bilayers. Both N-succinyldeformylgramicidin methyl ester and charged O-succinylgramicidin formed channels, but the channels had markedly different sizes and lifetimes. This implies that gramicidin forms channels by end-to-end association. However, the doubly charged N,O-bissuccinyldeformylgramicidin was inactive, which suggests that only end-to-end association of gramicidin may result in channel formation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bradley, R J -- Urry, D W -- Okamoto, K -- Rapaka, R -- New York, N.Y. -- Science. 1978 Apr 28;200(4340):435-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/77040" target="_blank"〉PubMed〈/a〉
    Keywords: Electric Conductivity ; *Gramicidin ; Hydrogen Bonding ; Ionophores ; Membranes, Artificial ; Protein Conformation ; Structure-Activity Relationship
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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)
    Details
    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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    Electrostatic effects in proteins (1978)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1978-09-29
    Description: Electrostatic effects dominate many aspects of protein behavior. When polypeptide chains fold up, most polar side chains seek the exterior, where they can be solvated. Water bound in the interior has been found between the domains of enzymes of the chymotrypsin family, and between the subunits of hemoglobin and tobacco mosaic virus protein. Assembly of this protein from disk to virus is triggered by electrostatic interactions between neighboring subunits. Lysozyme stabilizes the constellation of charges involved in the transition state of its substrate by both permanent and induced dipoles. All factors that lower the oxygen affinity of hemoglobin act by strengthening the salt bridges that constrain its quaternary deoxy (T) structure. Enzymes of thermophile bacteria owe their extra stability mostly to additional salt bridges. The rate of denaturation of hemoglobins by alkali is determined by the ionization of internal side chains with pK's of about 12.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Perutz, M F -- New York, N.Y. -- Science. 1978 Sep 29;201(4362):1187-91.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/694508" target="_blank"〉PubMed〈/a〉
    Keywords: Allosteric Regulation ; Amino Acid Sequence ; Catalysis ; Ions ; Macromolecular Substances ; Protein Conformation ; Protein Denaturation ; *Proteins ; Salts ; Structure-Activity Relationship ; Temperature ; Viruses/ultrastructure ; Water
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  • 52
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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)
    Details
    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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    Myosin: immunofluorescent localization in neuronal and glial cultures (1978)
    American Association for the Advancement of Science (AAAS)
    Details
    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)
    Details
    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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    Tricyclic antidepressants: therapeutic properties and affinity for alpha-noradrenergic receptor binding sites in the brain (1978)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1978-01-13
    Description: Tricyclic antidepressants vary in their capacity to cause psychomotor activation, to relieve agitated depressive states, and to cause sedation and hypotension. We have quantified relative potencies of tricyclic antidepressants in competing for the binding of 3H-labeled WB-4101 to alpha-noradrenergic receptor sites in rat brain membranes. Affinities of tricyclic drugs for alpha-noradrenergic receptor sites in the brain correlate well with the capacity of these agents to relieve psychomotor agitation and to induce sedation and hypotension; these affinities also correlate inversely with tendencies to elicit psychomotor activation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉U'Prichard, D C -- Greenberg, D A -- Sheehan, P P -- Snyder, S H -- New York, N.Y. -- Science. 1978 Jan 13;199(4325):197-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/202024" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antidepressive Agents, Tricyclic/*metabolism/therapeutic use ; Binding, Competitive ; Brain/*metabolism ; Humans ; Hypotension/chemically induced ; Psychomotor Agitation/*drug therapy ; Rats ; Receptors, Adrenergic/*metabolism ; Receptors, Adrenergic, alpha/*metabolism ; Structure-Activity Relationship
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    Human breast cancer: androgen action mediated by estrogen receptor (1978)
    American Association for the Advancement of Science (AAAS)
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    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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    Vasopressin analog with extraordinarily high antidiuretic potency: a study of conformation and activity (1978)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1978-01-20
    Description: Application of information derived from a three-dimensional model of vasopressin bound to its antidiuretic receptor has resulted in the design and synthesis of a potent analog, [1-deamino, 2-phenylalanine, 7-(3,4-dehydroproline)]-arginine vasopressin; this analog has a specific antidiuretic activity of 13,000 +/- 1,250 units per milligram; noteworthy at these doses is the absence of any detectable pressor activity. Three modifications based on conformational considerations were introduced into the vasopressin molecule in preparing the analog: (i) to enhance binding, a double bond was introduced into the side chain of an amino acid residue occupying a corner position of a beta turn in the vasopressin conformation, (ii) the hydroxyl moiety was deleted from Tyr2, and (iii) to tighten the backbone structure and to enhance the enzymatic resistance of the analog, the NH2-terminal amino group was deleted.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Smith, C W -- Walter, R -- New York, N.Y. -- Science. 1978 Jan 20;199(4326):297-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/619455" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Deamino Arginine Vasopressin/analogs & derivatives ; Diuresis/drug effects ; Heart Rate/drug effects ; Protein Conformation ; Structure-Activity Relationship ; Vasopressins/*analogs & derivatives/pharmacology
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    Tumor promoters inhibit morphological differentiation in cultured mouse neuroblastoma cells (1978)
    American Association for the Advancement of Science (AAAS)
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    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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  • 59
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    Cyclic polyether-protonated organic amine binding: significance in enzymatic and ion transport processes (1978)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1978-03-03
    Description: The cyclic polyether, 18-crown-6, reacts with protonated amines in methanol to form complexes whose formation constants (log K) decrease in the order NH4+, RNH3+ greater than R2NH2+ greater than R3NH+. In the case of the organic amines, this stability order is identical to the earlier observed permeability sequence for protonated organic amines in glyceryl dioleate bilayers treated with valinomycin, nonactin, or gramicidin, and in bullfrog and rabbit gallbladder membranes. The decrease in log K values in the above series is primarily a result of decreased enthalpy change (deltaH) values, the entropy change (TdeltaS) term being essentially constant for the systems studied.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Izatt, R M -- Izatt, N E -- Rossiter, B E -- Christensen, J J -- Haymore, B L -- New York, N.Y. -- Science. 1978 Mar 3;199(4332):994-6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/622582" target="_blank"〉PubMed〈/a〉
    Keywords: Amines/*metabolism ; Biological Transport ; Enzymes/metabolism ; Ethers, Cyclic/*metabolism ; Hydrogen Bonding ; Membranes/metabolism ; Permeability ; Protons ; Structure-Activity Relationship ; Thermodynamics
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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)
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    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)
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    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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    Aspects of hypothalamic regulation of the pituitary gland (1978)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1978-10-06
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Schally, A V -- New York, N.Y. -- Science. 1978 Oct 6;202(4363):18-28.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/99816" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Awards and Prizes ; Gonadotropin-Releasing Hormone/isolation & purification/physiology ; Hormones/pharmacology ; Hypothalamic Hormones/*physiology ; Hypothalamus/*physiology ; Pituitary Gland, Anterior/*physiology ; Somatostatin/isolation & purification/physiology ; Structure-Activity Relationship ; Thyrotropin-Releasing Hormone/isolation & purification
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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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    Conformation of [Leu5]enkephalin from X-ray diffraction: features important for recognition at opiate receptor (1978)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1978-03-17
    Description: The conformation of [Leu5]enkephalin is produced by a Tyr-Gly-Gly-Phe beta bend stabilized by antiparallel hydrogen bonding between tyrosine and phenylalanine. On the basis of a comparison of the observed structure with the structure of known opiate agonists, three hydrophilic and two hydrophobic regions have been identified as contributing to the recognition of the molecule at the opiate receptor site.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Smith, D -- Griffin, J F -- New York, N.Y. -- Science. 1978 Mar 17;199(4334):1214-6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/204006" target="_blank"〉PubMed〈/a〉
    Keywords: *Endorphins/metabolism ; *Enkephalins/metabolism ; Hydrogen Bonding ; Models, Molecular ; Morphine ; Protein Conformation ; Receptors, Opioid/metabolism ; Structure-Activity Relationship ; X-Ray Diffraction
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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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
    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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    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
    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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    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
    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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    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
    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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  • 69
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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
    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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