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  • Humans  (3)
  • (Na, K)-ATPase  (1)
  • 1980-1984  (4)
  • 1960-1964
  • 1955-1959
  • 1940-1944
  • 1
    Electronic Resource
    Electronic Resource
    Ouabain binding in rectal gland ofSqualus acanthias (1983)
    Springer
    The journal of membrane biology 75 (1983), S. 105-114 
    Details
    ISSN: 1432-1424
    Keywords: shark rectal gland ; ouabain binding ; (Na, K)-ATPase ; cyclic AMP ; slices ; isolated cells
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Summary In an attempt to examine the mechanisms of activation of (Na, K)-ATPase when epithelial transport is stimulated, the binding of ouabain to rectal gland tissue was measured before and after stimulation with dibutyryl cAMP and theophylline. Stimulation significantly altered the characteristics of ouabain binding to slices ofSqualus acanthias rectal gland and to isolated rectal gland cells, accelerating the rate of binding and increasing the amount of ouabain bound at equilibrium when low concentrations of ouabain (10−9 to 10−7 m) were present in the medium. Scatchard plots of ouabain binding were nonlinear, suggesting at least two classes of binding sites, one of higher and one of lower affinity. Stimulation with cAMP and theophylline appeared to increase the affinity of the high-affinity site. Ouabain binding was increased by cAMP and theophylline even in the presence of furosemide (10−4 m) or bumetanide (10−5 m), and when Li+ was substituted for Na+, or NO 3 − for Cl−-maneuvers known to inhibit rectal gland secretion. The changes in ouabain binding induced by cAMP and theophylline do not appear, therefore, to be secondary to secretory activity but may reflect a change in the configuration, environment or location of existing enzyme so as to enhance its activity. Stimulation of ouabain binding cannot be demonstrated in whole homogenates of rectal gland, indicating that intact cells are necessary for the cyclic AMP-induced increase in ouabain binding to become manifest.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01995630
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    Paper (German National Licenses)
    Fulltext
  • 2
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    X-linked ichthyosis: increased blood cholesterol sulfate and electrophoretic mobility of low-density lipoprotein (1981)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1981-11-06
    Description: Plasma cholesterol sulfate concentration is increased in patients with recessive X-linked ichthyosis, a disease in which steroid sulfatase activity is absent. In these patients, cholesterol sulfate is found primarily in the low-density lipoprotein fraction of plasma, and the electrophoretic mobility of these lipoproteins is greatly increased.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Epstein, E H Jr -- Krauss, R M -- Shackleton, C H -- AM 28069/AM/NIADDK NIH HHS/ -- HL 18574/HL/NHLBI NIH HHS/ -- RR 00719/RR/NCRR NIH HHS/ -- New York, N.Y. -- Science. 1981 Nov 6;214(4521):659-60.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6945674" target="_blank"〉PubMed〈/a〉
    Keywords: Cholesterol Esters/*blood ; Electrophoresis, Agar Gel ; Female ; Genes, Recessive ; Genetic Linkage ; Humans ; Ichthyosis/blood/*genetics ; Lipoproteins, LDL/*blood ; Steryl-Sulfatase ; Sulfatases/deficiency ; Sulfates ; X Chromosome
    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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  • 3
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    Differential killing of normal and cystic fibrosis fibroblasts by dexamethasone (1980)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1980-02-29
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Breslow, J L -- Epstein, J -- New York, N.Y. -- Science. 1980 Feb 29;207(4434):1007-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7352296" target="_blank"〉PubMed〈/a〉
    Keywords: Cell Survival/drug effects ; Cells, Cultured ; Cystic Fibrosis/*drug therapy ; Dexamethasone/*pharmacology ; Ethyl Methanesulfonate/pharmacology ; Humans ; Methods
    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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  • 4
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    Endoscopy: developments in optical instrumentation (1980)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1980-10-17
    Description: Optical fibers transmit high-intensity illumination for viewing internal organs and tissue. Remote viewing is obtained by relays of lenses or graded-index-of-refraction rods in rigid endoscopes and by precisely aligned fiber-optic bundles in flexible fiberscopes. Endoscopy is considered for routine examinations, such as in colonoscopy. Lasers are used as surgical tools through endoscopes for cutting and coagulation. They may also be used to provide illumination for the efficient transmission of light through thin optical fibers.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Epstein, M -- New York, N.Y. -- Science. 1980 Oct 17;210(4467):280-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7423188" target="_blank"〉PubMed〈/a〉
    Keywords: Colonoscopes ; Colonoscopy/adverse effects ; *Endoscopes ; Fiber Optic Technology/instrumentation ; Humans ; Lasers ; Lighting ; Optical Fibers
    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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