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  • Mice  (307)
  • Adult  (71)
  • American Association for the Advancement of Science (AAAS)  (378)
  • American Geophysical Union
  • Blackwell Publishing Ltd
  • 2020-2023
  • 1985-1989  (208)
  • 1980-1984  (170)
  • 1970-1974
Collection
Publisher
  • American Association for the Advancement of Science (AAAS)  (378)
  • American Geophysical Union
  • Blackwell Publishing Ltd
  • Springer  (6)
Years
Year
  • 1
    Publication Date: 1981-12-04
    Description: Leucine catabolism is regulated by either of the first two degradative steps: (reversible) transamination to the keto acid or subsequent decarboxylation. A method is described to measure rates of leucine transamination, reamination, and keto acid oxidation. The method is applied directly to humans by infusing the nonradioactive tracer, L-[15N,1-13C]leucine. Leucine transamination was found to be operating several times faster than the keto acid decarboxylation and to be of equal magnitude in adult human males under two different dietary conditions, postabsorptive and fed. These results indicate that decarboxylation, not transamination, is the rate-limiting step in normal human leucine metabolism.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Matthews, D E -- Bier, D M -- Rennie, M J -- Edwards, R H -- Halliday, D -- Millward, D J -- Clugston, G A -- AM-25994/AM/NIADDK NIH HHS/ -- HD-10667/HD/NICHD NIH HHS/ -- RR-00954/RR/NCRR NIH HHS/ -- New York, N.Y. -- Science. 1981 Dec 4;214(4525):1129-31.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7302583" target="_blank"〉PubMed〈/a〉
    Keywords: Adult ; Carbon Isotopes ; Humans ; Kinetics ; Leucine/*metabolism ; Male ; Models, Biological ; Nitrogen Isotopes ; Oxidation-Reduction
    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
    Publication Date: 1989-08-18
    Description: CD4 is a cell surface glycoprotein that is thought to interact with nonpolymorphic determinants of class II major histocompatibility (MHC) molecules. CD4 is also the receptor for the human immunodeficiency virus (HIV), binding with high affinity to the HIV-1 envelope glycoprotein, gp120. Homolog-scanning mutagenesis was used to identify CD4 regions that are important in class II MHC binding and to determine whether the gp120 and class II MHC binding sites of CD4 are related. Class II MHC binding was abolished by mutations in each of the first three immunoglobulin-like domains of CD4. The gp120 binding could be abolished without affecting class II MHC binding and vice versa, although at least one mutation examined reduced both functions significantly. These findings indicate that, while there may be overlap between the gp120 and class II MHC binding sites of CD4, these sites are distinct and can be separated. Thus it should be possible to design CD4 analogs that can block HIV infectivity but intrinsically lack the ability to affect the normal immune response by binding to class II MHC molecules.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lamarre, D -- Ashkenazi, A -- Fleury, S -- Smith, D H -- Sekaly, R P -- Capon, D J -- New York, N.Y. -- Science. 1989 Aug 18;245(4919):743-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratoire d'Immunologie, Institut de Recherches Cliniques de Montreal, Quebec, Canada.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2549633" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Antigens, Surface ; Binding Sites ; DNA, Recombinant ; HIV/*metabolism ; HIV Envelope Protein gp120 ; HLA-DP Antigens/immunology ; Histocompatibility Antigens Class II/*immunology ; Humans ; Hybridomas ; Mice ; Molecular Sequence Data ; Mutation ; Receptors, HIV ; Receptors, Virus/genetics/immunology/*metabolism ; Retroviridae Proteins/immunology/*metabolism ; Rosette Formation ; Structure-Activity Relationship ; T-Lymphocytes/immunology/metabolism ; Transfection
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 3
    Publication Date: 1983-11-18
    Description: Hybridoma technology has made it possible to introduce into continuous culture normal antibody-forming cells and to obtain large amounts of the immunoglobulin produced by each of these cells. Examination of the structure of a number of monoclonal antibodies that react with a single antigen has provided new information on the structural basis of the specificity and affinity of antibodies. Comparisons of families of monoclonal antibodies derived from a single germ line gene revealed the importance of somatic mutation in generating antibody diversity. Monoclonal antibodies that react with variable regions of other monoclonals allow the further dissection and modulation of the immune response. Finally, the continued somatic instability of immunoglobulin genes in cultured antibody-forming cells makes it possible to determine the rate of somatic mutation and to generate mutant monoclonal antibodies that may be more effective serological reagents.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Teillaud, J L -- Desaymard, C -- Giusti, A M -- Haseltine, B -- Pollock, R R -- Yelton, D E -- Zack, D J -- Scharff, M D -- 5T32GM7288/GM/NIGMS NIH HHS/ -- AI05231/AI/NIAID NIH HHS/ -- AI10702/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 1983 Nov 18;222(4625):721-6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6356353" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Antibodies, Monoclonal/genetics/*immunology ; *Antibody Diversity ; Antibody Specificity ; Genes ; Hybridomas/immunology ; Immunoglobulin Idiotypes/immunology ; Immunoglobulin Variable Region/genetics ; Mice ; Mutation ; Protein Conformation ; Structure-Activity Relationship
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 4
    Publication Date: 1984-11-30
    Description: A single recessive gene, lpr, induces an autoimmune-lymphoproliferative syndrome in several strains of mice. The lymphoid organs of lpr/lpr mice contained cells with increased amounts of myb RNA, which codes for a protein found in the nucleus. A similar human lymphoproliferative disorder also had an increase in c-myb expression. Mouse T cells induced by mitogens to proliferate did not express large amounts of myb RNA, indicating that marked myb expression is not a general feature of lymphocyte activation and proliferation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Mountz, J D -- Steinberg, A D -- Klinman, D M -- Smith, H R -- Mushinski, J F -- New York, N.Y. -- Science. 1984 Nov 30;226(4678):1087-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6494925" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Autoantibodies/*genetics ; Autoimmune Diseases/*genetics ; Female ; *Genes, Recessive ; Lymphocytes/immunology ; Lymphoproliferative Disorders/*genetics ; Mice ; Mice, Inbred Strains ; Nucleic Acid Hybridization ; *Oncogenes ; Species Specificity ; Spleen/immunology ; *Transcription, Genetic
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  • 5
    Publication Date: 1984-07-06
    Description: A retrovirus isolated from three patients with the acquired immunodeficiency syndrome (AIDS) in the United States was morphologically and antigenically identical to lymphadenopathy associated virus isolated in France. Two of these isolates were from a blood donor-recipient pair, each of whom developed AIDS. Lymphadenopathy associated virus was isolated from the blood donor's lymphocytes 12 months after his onset of AIDS symptoms and from the blood recipient's lymphocytes 1 month after her onset of AIDS symptoms. Two isolates from the blood donor-recipient pair and an isolate from an epidemiologically unrelated homosexual man were examined by competitive radioimmunoassay to determine their antigenic relatedness to each other and to other human retroviruses. The major core proteins (p25) of the isolates were antigenically identical and all three isolates were identical to prototype lymphadenopathy associated virus isolated in France.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Feorino, P M -- Kalyanaraman, V S -- Haverkos, H W -- Cabradilla, C D -- Warfield, D T -- Jaffe, H W -- Harrison, A K -- Gottlieb, M S -- Goldfinger, D -- Chermann, J C -- New York, N.Y. -- Science. 1984 Jul 6;225(4657):69-72.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6328663" target="_blank"〉PubMed〈/a〉
    Keywords: Acquired Immunodeficiency Syndrome/*microbiology/transmission ; Adult ; Antibodies, Viral/immunology ; *Blood Donors ; Blood Transfusion/adverse effects ; Deltaretrovirus/immunology ; Female ; Humans ; Male ; Retroviridae/*immunology ; Retroviridae Infections/*immunology
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  • 6
    Publication Date: 1984-02-17
    Description: The effect of hypoxic exposure on various mitochondrial enzymes and on cell mitochondrial genomic content was studied in two types of mammalian cells. Hypoxia depressed the activity of six enzymes to the same degree. The kinetics of depression and of recovery during reexposure to normoxia were statistically similar for three marker enzymes. Despite the global and symmetrical decrease in enzyme activities, mitochondrial DNA remained constant. This suggests either symmetrical loss of mitochondrial enzymes from all mitochondria or complete loss of enzymes from a subpopulation of mitochondria with retention of an intact mitochondrial genome.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Murphy, B J -- Robin, E D -- Tapper, D P -- Wong, R J -- Clayton, D A -- 5 R01 HL23701-14/HL/NHLBI NIH HHS/ -- New York, N.Y. -- Science. 1984 Feb 17;223(4637):707-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6320368" target="_blank"〉PubMed〈/a〉
    Keywords: Aerobiosis ; Anaerobiosis ; Animals ; Anoxia/physiopathology ; Citrate (si)-Synthase/genetics/*metabolism ; DNA, Mitochondrial/*genetics ; Electron Transport Complex IV/genetics/*metabolism ; Macrophages/*enzymology ; Mice ; Mitochondria/*enzymology ; Mitochondria, Muscle/*enzymology ; Oxidoreductases/genetics/*metabolism ; Oxo-Acid-Lyases/*metabolism ; Rats
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  • 7
    Publication Date: 1984-08-31
    Description: Plasma-free homovanillic acid, a major metabolite of dopamine, was measured in chronically ill schizophrenic patients both before and during treatment with the antipsychotic phenothiazine, fluphenazine. Neuroleptic treatment was associated with a significant time-dependent decrease in plasma homovanillic acid from pretreatment values, which were significantly elevated when compared with those of age- and sex-matched healthy control subjects. Further, both the absolute concentrations as well as the neuroleptic-induced reductions in plasma homovanillic acid determined over 5 weeks of neuroleptic treatment were statistically significantly correlated with ratings of psychosis and improvement in psychosis, respectively. These findings suggest that the delayed effects of neuroleptic agents on presynaptic dopamine activity may more closely parallel their therapeutic actions than do their immediate effects in blocking postsynaptic dopamine receptors and that a decrease in dopamine "turnover" may be responsible for their antipsychotic effects.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Pickar, D -- Labarca, R -- Linnoila, M -- Roy, A -- Hommer, D -- Everett, D -- Paul, S M -- New York, N.Y. -- Science. 1984 Aug 31;225(4665):954-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6474162" target="_blank"〉PubMed〈/a〉
    Keywords: Adult ; Dopamine/metabolism ; Female ; Fluphenazine/pharmacology/*therapeutic use ; Homovanillic Acid/*blood ; Humans ; Male ; Phenylacetates/*blood ; Schizophrenia/blood/*drug therapy ; Time Factors
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  • 8
    Publication Date: 1982-08-13
    Description: Cognitive activity resulted in increased flow of blood to the cerebral hemispheres. The increase was greater to the left hemisphere for a verbal task and greater to the right hemisphere for a spatial task. The direction and degree of hemispheric flow asymmetry were influenced by sex and handedness, females having a higher rate of blood flow per unit weight of brain, and females and left-handers having a greater percentage of fast-clearing tissue, presumably gray matter.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gur, R C -- Gur, R E -- Obrist, W D -- Hungerbuhler, J P -- Younkin, D -- Rosen, A D -- Skolnick, B E -- Reivich, M -- MH 30456/MH/NIMH NIH HHS/ -- NS-10939-09/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 1982 Aug 13;217(4560):659-61.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7089587" target="_blank"〉PubMed〈/a〉
    Keywords: Adolescent ; Adult ; Brain/metabolism/*physiology ; *Cerebrovascular Circulation ; *Cognition ; Female ; *Functional Laterality ; Humans ; Male ; Metabolic Clearance Rate ; Rest ; *Sex Characteristics
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  • 9
    Publication Date: 1988-08-19
    Description: Familial polyposis coli (FPC) is caused by an autosomal dominant gene on chromosome 5, and it has been proposed that colorectal cancer in the general population arises from loss or inactivation of the FPC gene, analogous to recessive tumor genes in retinoblastoma and Wilms' tumor. Since allelic loss can be erroneously scored in nonhomogeneous samples, tumor cell populations were first microdissected from 24 colorectal carcinomas, an additional nine cancers were engrafted in nude mice, and nuclei were flow-sorted from an additional two. Of 31 cancers informative for chromosome 5 markers, only 6 (19%) showed loss of heterozygosity of chromosome 5 alleles, compared to 19 of 34 (56%) on chromosome 17, and 17 of 33 (52%) on chromosome 18. Therefore, it appears that (i) FPC is a true dominant for adenomatosis but not a common recessive gene for colon cancer; and (ii) simple Mendelian models involving loss of alleles at a single locus may be inappropriate for understanding common human solid tumors.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Law, D J -- Olschwang, S -- Monpezat, J P -- Lefrancois, D -- Jagelman, D -- Petrelli, N J -- Thomas, G -- Feinberg, A P -- New York, N.Y. -- Science. 1988 Aug 19;241(4868):961-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute, University of Michigan Medical School, Ann Arbor 48109.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2841761" target="_blank"〉PubMed〈/a〉
    Keywords: Adenocarcinoma/genetics ; Adenoma/genetics ; Adenomatous Polyposis Coli/*genetics ; *Alleles ; Animals ; Chromosomes, Human, Pair 17 ; Chromosomes, Human, Pair 18 ; Chromosomes, Human, Pair 5 ; Colonic Neoplasms/*genetics ; DNA, Neoplasm/analysis ; Genes, Dominant ; *Genetic Linkage ; Humans ; Mice ; Precancerous Conditions/genetics ; Rectal Neoplasms/*genetics
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  • 10
    Publication Date: 1985-08-09
    Description: Fifteen independently isolated complementary DNA clones that contain T-cell receptor (TCR) V beta genes were sequenced and found to represent 11 different V beta genes. When compared with known sequences, 14 different V beta genes could be defined from a total of 25 complementary DNA's; 11 clones therefore involved repeated usage of previously identified V beta's. Based on these data, we calculate a maximum likelihood estimate of the number of expressed germline V beta genes to be 18 with an upper 95 percent confidence bound of 30 genes. Southern blot analysis has shown that most of these genes belong to single element subfamilies which show very limited interstrain polymorphism. The TCR beta-chain diversity appears to be generated from a limited V beta gene pool primarily by extensive variability at the variable-diversity-joining (V-D-J) junctional site, with no evidence for the involvement of somatic hypermutation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Behlke, M A -- Spinella, D G -- Chou, H S -- Sha, W -- Hartl, D L -- Loh, D Y -- GM07200/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1985 Aug 9;229(4713):566-70.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3875151" target="_blank"〉PubMed〈/a〉
    Keywords: Alleles ; Animals ; Base Sequence ; Chromosome Mapping ; Cloning, Molecular ; Dna ; Gene Pool ; *Genetic Variation ; Humans ; Hybridomas ; Immunoglobulin Variable Region/genetics ; Mice ; Mice, Inbred BALB C/genetics ; Mice, Inbred C57BL/genetics ; Mice, Inbred Strains/genetics ; Receptors, Antigen, T-Cell/*genetics ; Species Specificity ; Spleen ; T-Lymphocytes ; Thymus Gland
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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