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  • 1
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    A mutant Drosophila insulin receptor homolog that extends life-span and impairs neuroendocrine function (2001)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2001-04-09
    Description: The Drosophila melanogaster gene insulin-like receptor (InR) is homologous to mammalian insulin receptors as well as to Caenorhabditis elegans daf-2, a signal transducer regulating worm dauer formation and adult longevity. We describe a heteroallelic, hypomorphic genotype of mutant InR, which yields dwarf females with up to an 85% extension of adult longevity and dwarf males with reduced late age-specific mortality. Treatment of the long-lived InR dwarfs with a juvenile hormone analog restores life expectancy toward that of wild-type controls. We conclude that juvenile hormone deficiency, which results from InR signal pathway mutation, is sufficient to extend life-span, and that in flies, insulin-like ligands nonautonomously mediate aging through retardation of growth or activation of specific endocrine tissue.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Tatar, M -- Kopelman, A -- Epstein, D -- Tu, M P -- Yin, C M -- Garofalo, R S -- R01 AG16632/AG/NIA NIH HHS/ -- New York, N.Y. -- Science. 2001 Apr 6;292(5514):107-10.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Brown University, Providence, RI 02912, USA., University of Massachusetts, Amherst, MA 01003, USA. Marc_Tatar@Brown.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11292875" target="_blank"〉PubMed〈/a〉
    Keywords: Aging/*physiology ; Alleles ; Animals ; Carrier Proteins/*genetics/*physiology ; Corpora Allata/*metabolism ; *Drosophila Proteins ; Drosophila melanogaster/genetics/*physiology ; Female ; Fertility ; Genes, Insect ; Genotype ; Insulin/pharmacology ; Juvenile Hormones/metabolism ; Longevity/*physiology ; Male ; Methoprene/pharmacology ; Mutation ; Protein-Tyrosine Kinases/*genetics/*physiology ; *Receptor Protein-Tyrosine Kinases ; Receptor, Insulin/genetics/physiology ; Reproduction ; Signal Transduction ; Superoxide Dismutase/metabolism ; Triglycerides/metabolism ; Vitellogenesis/drug effects
    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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  • 2
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    Protection of C. elegans from anoxia by HYL-2 ceramide synthase (2009)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2009-04-18
    Description: Oxygen deprivation is rapidly deleterious for most organisms. However, Caenorhabditis elegans has developed the ability to survive anoxia for at least 48 hours. Mutations in the DAF-2/DAF-16 insulin-like signaling pathway promote such survival. We describe a pathway involving the HYL-2 ceramide synthase that acts independently of DAF-2. Loss of the ceramide synthase gene hyl-2 results in increased sensitivity of C. elegans to anoxia. C. elegans has two ceramide synthases, hyl-1 and hyl-2, that participate in ceramide biogenesis and affect its ability to survive anoxic conditions. In contrast to hyl-2(lf) mutants, hyl-1(lf) mutants are more resistant to anoxia than normal animals. HYL-1 and HYL-2 have complementary specificities for fatty acyl chains. These data indicate that specific ceramides produced by HYL-2 confer resistance to anoxia.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Menuz, Vincent -- Howell, Kate S -- Gentina, Sebastien -- Epstein, Sharon -- Riezman, Isabelle -- Fornallaz-Mulhauser, Monique -- Hengartner, Michael O -- Gomez, Marie -- Riezman, Howard -- Martinou, Jean-Claude -- New York, N.Y. -- Science. 2009 Apr 17;324(5925):381-4. doi: 10.1126/science.1168532.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Cell Biology, University of Geneva, CH-1211 Geneva 4, Switzerland.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19372430" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Apoptosis ; Caenorhabditis elegans/cytology/genetics/*physiology ; Caenorhabditis elegans Proteins/*genetics/*metabolism ; *Cell Hypoxia ; Ceramides/biosynthesis/*physiology ; Gene Deletion ; Genes, Helminth ; Mutation ; Oxidoreductases/*genetics/*metabolism ; Oxygen/*physiology ; Receptor, Insulin/genetics/metabolism ; Saccharomyces cerevisiae/genetics/growth & development/physiology ; Sphingomyelins/biosynthesis/physiology ; Substrate Specificity ; Transformation, Genetic ; Transgenes
    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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    How calcium enhances plant salt tolerance (1998)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1998-07-21
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Epstein, E -- New York, N.Y. -- Science. 1998 Jun 19;280(5371):1906-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Land, Air and Water Resources-Soils and Biogeochemistry, Universsity of California at Davis 95616-8627, USA. eqepstein@ucdavis.e eqepstein@ucdavis.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9669949" target="_blank"〉PubMed〈/a〉
    Keywords: Arabidopsis/genetics/metabolism ; *Arabidopsis Proteins ; Calcium/*metabolism ; Genes, Plant ; Ion Transport ; Mutation ; Plant Proteins/chemistry/*genetics/*metabolism ; Plants/genetics/*metabolism ; Potassium/metabolism ; Second Messenger Systems ; Signal Transduction ; Sodium/metabolism/*pharmacology ; Water/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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  • 4
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    Basal cell carcinomas in mice overexpressing sonic hedgehog (1997)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1997-05-02
    Description: Mutations in the tumor suppressor gene PATCHED (PTC) are found in human patients with the basal cell nevus syndrome, a disease causing developmental defects and tumors, including basal cell carcinomas. Gene regulatory relationships defined in the fruit fly Drosophila suggest that overproduction of Sonic hedgehog (SHH), the ligand for PTC, will mimic loss of ptc function. It is shown here that transgenic mice overexpressing SHH in the skin develop many features of basal cell nevus syndrome, demonstrating that SHH is sufficient to induce basal cell carcinomas in mice. These data suggest that SHH may have a role in human tumorigenesis.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Oro, A E -- Higgins, K M -- Hu, Z -- Bonifas, J M -- Epstein, E H Jr -- Scott, M P -- AR39959/AR/NIAMS NIH HHS/ -- New York, N.Y. -- Science. 1997 May 2;276(5313):817-21.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute, Department of Dermatology, Stanford University School of Medicine, Stanford, CA 94305-5427, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9115210" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Basal Cell Nevus Syndrome/*genetics/metabolism/pathology ; Carcinoma, Basal Cell/*genetics/metabolism/pathology ; Embryo, Mammalian ; *Gene Expression Regulation, Neoplastic ; Hedgehog Proteins ; Humans ; Intracellular Signaling Peptides and Proteins ; Keratinocytes/metabolism ; Male ; Membrane Proteins/genetics/metabolism ; Mice ; Mice, SCID ; Mice, Transgenic ; Mutation ; Neoplasm Transplantation ; Protein Biosynthesis ; Proteins/*genetics/metabolism ; Receptors, Cell Surface ; Skin/pathology ; Skin Neoplasms/*genetics/metabolism/pathology ; Skin Transplantation ; *Trans-Activators
    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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  • 5
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    Cancer. An anchor for tumor cell invasion (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-03-19
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Yuspa, Stuart H -- Epstein, Ervin H Jr -- New York, N.Y. -- Science. 2005 Mar 18;307(5716):1727-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratory of Cellular Carcinogenesis and Tumor Promotion, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA. sy12j@nih.gov〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15774745" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Carcinoma, Squamous Cell/etiology/genetics/pathology/*physiopathology ; Cell Adhesion Molecules/metabolism ; Cell Transformation, Neoplastic ; Collagen Type VII/chemistry/*genetics/*physiology ; Disease Susceptibility ; Epidermolysis Bullosa Dystrophica/complications/*genetics/metabolism/pathology ; Genes, ras ; Humans ; I-kappa B Proteins/genetics/metabolism ; Keratinocytes/*metabolism/pathology ; Mice ; Mutation ; Neoplasm Invasiveness ; Protein Structure, Tertiary ; Skin Neoplasms/etiology/genetics/pathology/*physiopathology ; Transduction, Genetic ; Transforming Growth Factor beta/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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  • 6
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    Bats are natural reservoirs of SARS-like coronaviruses (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-10-01
    Description: Severe acute respiratory syndrome (SARS) emerged in 2002 to 2003 in southern China. The origin of its etiological agent, the SARS coronavirus (SARS-CoV), remains elusive. Here we report that species of bats are a natural host of coronaviruses closely related to those responsible for the SARS outbreak. These viruses, termed SARS-like coronaviruses (SL-CoVs), display greater genetic variation than SARS-CoV isolated from humans or from civets. The human and civet isolates of SARS-CoV nestle phylogenetically within the spectrum of SL-CoVs, indicating that the virus responsible for the SARS outbreak was a member of this coronavirus group.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Li, Wendong -- Shi, Zhengli -- Yu, Meng -- Ren, Wuze -- Smith, Craig -- Epstein, Jonathan H -- Wang, Hanzhong -- Crameri, Gary -- Hu, Zhihong -- Zhang, Huajun -- Zhang, Jianhong -- McEachern, Jennifer -- Field, Hume -- Daszak, Peter -- Eaton, Bryan T -- Zhang, Shuyi -- Wang, Lin-Fa -- R01-TW05869/TW/FIC NIH HHS/ -- New York, N.Y. -- Science. 2005 Oct 28;310(5748):676-9. Epub 2005 Sep 29.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute of Zoology, Chinese Academy of Sciences (CAS), Beijing, China.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16195424" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Cercopithecus aethiops ; China/epidemiology ; Chiroptera/*virology ; Communicable Diseases, Emerging ; *Coronavirus/classification ; Disease Outbreaks ; *Disease Reservoirs ; Genetic Variation ; Genome, Viral ; Henipavirus/classification ; Humans ; Molecular Sequence Data ; Mutation ; Phylogeny ; Polymerase Chain Reaction ; *SARS Virus/classification ; Sequence Analysis, DNA ; Severe Acute Respiratory Syndrome/epidemiology/transmission/virology ; Vero Cells ; Viverridae/virology
    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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  • 7
    Electronic Resource
    Electronic Resource
    The Importance of Magnetic Coupling Through Atoms with Large Spin Densities - Structure and Magnetic Properties of meso-Tetrakis-(4′-tert-Butylphenyl)Porphinatomanganese(III) Hexacyanobutadienide, [MnIIITtBuPP]+[C4(CN)6].- (1997)
    Weinheim : Wiley-Blackwell
    Chemistry - A European Journal 3 (1997), S. 138-142 
    Details
    ISSN: 0947-6539
    Keywords: electron transfer ; magnetic properties ; metalloporphryins ; polymers ; spin density ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: [MnIIITtBuPP]+[C4(CN)6].- · 5PhMe [MnIIITtBuPP = meso-tetrakis-(4′-tert-butylphenyl)porphinatomanganese(III)] has been prepared and structurally and magnetically characterized. The uniform, linear-chain (1-D) coordination polymer comprises alternating cations and anions. The bond lengths in planar ion [C4(CN)6].-]'- are 1.377(10) (CC-CC), 1.418(7) (C-CCC), 1.414 (C-CN), 1.457 (C-CNMn), 1.150 (C≡N), and 1.134 Å (C = NMn). The Mn-N-C angle is 172.3(4)°, and the intrachain Mn  -  Mn separation is 10.685 Å. Each [C4(CN)6].-]' unit is bonded to two MnIII atoms through the interior nitrogen atoms in a trans-μ2-N-σ manner with N-Mn bond lengths of 2.353 Å. The ṽCN absorptions are at 2217 (w, br) and 2190 (m) cm-1. Above 50 K the magnetic susceptibility of [MnIIITtBuPP]+[C4(CN)6].- can be fitted to the Curie-Weiss expression, χ∝1(T - θ), with an effective θ of -13 K. This is consistent with weak antiferromagnetic coupling, which is in contrast to the effective θ of +67 K for the uniform chain [MnIIIOEP]+[C4(CN)6].- [OEP = octaethylporphinato]. Here, the [C4(CN)6].-'- units are bonded to the MnIII centers through endo CN nitrogen atoms in a similar trans-μ2 manner. Density functional theory MO calculations reveal that the spin density of the CN nitrogen atom bound to [MnIIITtBuPP]+ (0.019 μBÅ-3) is significantly lower than that of the N atom bound to [MnIIIOEP]+ (0.102 μBÅ-3). This is consistent with the reduced spin coupling observed for [MnIIITtBuPP]+[C4(CN)6].-with respect to [MnIIITtBuPP]+[C4(CN)6].-, as evidenced by the lower θ value. The different orientations of the [C4(CN)6].- units - almost perpendicular (84.72°) for [MnIIITtBuPP]+[C4(CN)6].- and substantially tilted (32.1°) for [MnIIIOEP]+ [C4(CN)6].- may also contribute to the poorer overlap and weaker spin coupling. Hence, binding between sites with large spin densities is needed to stabilize strong ferromagnetic coupling.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/chem.19970030121
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  • 8
    Electronic Resource
    Electronic Resource
    Steuerung der elektronischen Struktur organischer Leiter am Beispiel von [NMP][TCNQ]-Charge-Transfer-Komplexen (1987)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 99 (1987), S. 332-339 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Der Austausch von Kationen gegen Neutralmoleküle ähnlicher Form und Polarisierbarkeit in einem hochleitfähigen („metallischen“) organischen Charge-Transfer-Komplex ermöglicht die gezielte Einstellung von dessen elektronischer Struktur vom viertel- zum halbgefüllten Band. Verwirklicht wurde dieses Konzept in idealer Weise am N-Methylphenazinium(NMP)-Salz des Tetracyanchinodimethan(TCNQ)-Anions; bei diesem Salz läßt sich das Kation partiell gegen Phenazin austauschen. Eine detaillierte Untersuchung der optischen, elektrischen und magnetischen Eigenschaften der so erhaltenen leitfähigen molekularen Festkörper führte zu einem besseren Verständnis der Physik eindimensionaler organischer Leiter und zur Neuinterpretation des Mechanismus des Elektrontransports in diesen Festkörpern. Es wurden Phänomene wie der Übergang von einem „Zwei-Ketten-Leiter“ mit niedriger Coulomb-Abstoßung zum „Ein-Ketten-Leiter“ mit hoher Coulomb-Abstoßung und ein durch Solitonen unterstützter Elektronentransport beobachtet.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19870990408
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  • 9
    Electronic Resource
    Electronic Resource
    Organische und metallorganische molekulare magnetische Materialien: Designer-Magnete (1994)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 106 (1994), S. 399-432 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 30 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19941060405
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  • 10
    Electronic Resource
    Electronic Resource
    Bestimmung der Spindichteverteilung im Tetracyanethylen-Radikalanion durch Beugung polarisierter Neutronen am EinkristallBeitrag Nr. 6619. Diese Arbeit wurde vom Department of Energy, Division of Materials Sciences (Grant Nos. DE-FG03-93ER45504 und DE-FG02-86BR45271) gefördert. Wir danken Carlos Vazquez, William J. Marshall und Joseph C. Calabrese (DuPont) für die Einkristallröntgenstrukturanalyse. (1994)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 106 (1994), S. 1454-1457 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19941061325
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