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  • 1
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    Cholinergic agonists induce vectorial release of serotonin from duodenal enterochromaffin cells (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1982-07-23
    Description: Serotonin-containing enterochromaffin cells in the rabbit duodenal mucosa span the tissue contacting both the luminal and serosal sides. When the serosal surface is stimulated with carbachol in vitro, serotonin is secreted on the serosal side but not the mucosal side. Carbachol added to the luminal side is ineffective. Atropine but not hexamethonium blocks the effect of carbachol. Acetylcholine on the serosal surface also stimulates serotonin release on the serosal side. These findings indicate that enterochromaffin cells possess on their serosal surfaces muscarinic receptors that mediate vectorial release of serotonin when activated by cholinergic agonists.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Forsberg, E J -- Miller, R J -- DA 02121/DA/NIDA NIH HHS/ -- New York, N.Y. -- Science. 1982 Jul 23;217(4557):355-6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7089569" target="_blank"〉PubMed〈/a〉
    Keywords: Acetylcholine/pharmacology ; Animals ; Atropine/pharmacology ; Carbachol/pharmacology ; Chromaffin System/*secretion ; Duodenum/physiology ; Enterochromaffin Cells/*secretion ; Hexamethonium Compounds/pharmacology ; In Vitro Techniques ; Intestinal Mucosa/drug effects ; Parasympathomimetics/*pharmacology ; Rabbits ; Receptors, Muscarinic/metabolism ; Serotonin/*secretion ; Serous Membrane/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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    Stimulation of colonic secretion by lipoxygenase metabolites of arachidonic acid (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1982-09-24
    Description: Both 5-hydroperoxyeicosatetraenoic acid (5-HPETE) and 5-hydroxyeicosatetraenoic acid (5-HETE) increased the short-circuit current (Isc) in rabbit colonic mucosa mounted in vitro in Ussing chambers. Measurements of chlorine-36 fluxes indicated that the Isc response to 5-HPETE is due to stimulation of active chlorine secretion. 9-, 11-, and 12-HPETE's and leukotrienes C4 and B4 produced either very small increases in Isc or no increase. In contrast to results in rabbit colon, no HPETE, HETE, or leukotriene was effective in rabbit ileal mucosa. The effects of 5-HPETE in the rabbit colon were unaffected by mepacrine, but could be partially blocked by indomethacin. These results suggest that drugs which block both cyclooxygenase and lipoxygenase may be effective antidiarrheals in patients with colitis.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Musch, M W -- Miller, R J -- Field, M -- Siegel, M I -- AM 21345/AM/NIADDK NIH HHS/ -- DA 02121/DA/NIDA NIH HHS/ -- New York, N.Y. -- Science. 1982 Sep 24;217(4566):1255-6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6810465" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Arachidonic Acids/*pharmacology ; Bicarbonates/metabolism ; Chlorides/metabolism ; Colitis/physiopathology ; Colon/*physiopathology ; Diarrhea/*physiopathology ; *Hydroxyeicosatetraenoic Acids ; Ileum/physiopathology ; Indomethacin/pharmacology ; *Leukotrienes ; *Lipoxygenase Inhibitors ; Rabbits
    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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    N-acetylation regulates the behavioral activity of alpha-melanotropin in a multineurotransmitter neuron (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1982-02-26
    Description: A multineurotransmitter neuronal system that synthesizes and secretes both acetylated and deacetylated forms of alpha-melantropin and beta-endorphin is present in rat and human brain. The N-acetylated from of alpha-melanotropin had more potent behavioral effects than the deacetylated alpha-melanotropin. In the case of beta-endorphin, however, the deacetylated form has been shown to be more potent than the acetylated form. Enzymatic N-acetylation appears to be an important regulatory process for modulating the behavioral activity of peptides secreted from the opiomelanotropinergic multineurotransmitter neuron.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉O'Donohye, T L -- Handelmann, G E -- Miller, R L -- Jacobowitz, D M -- New York, N.Y. -- Science. 1982 Feb 26;215(4536):1125-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7063845" target="_blank"〉PubMed〈/a〉
    Keywords: Acetylation ; Animals ; Behavior, Animal/drug effects ; Brain/*metabolism ; Humans ; Melanocyte-Stimulating Hormones/*metabolism/pharmacology ; Neurons/metabolism ; Rats ; Structure-Activity Relationship
    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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