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pubmed-article:1670978pubmed:abstractTextOpioid receptors on isolated gastric smooth muscle cells were characterized pharmacologically by a technique in which synthetic selective opioid agonists and antagonists were used to protect and thus enrich a specific receptor type while all other receptors were inactivated by N-ethylamaleimide. Treatment of the cells with the selective mu-receptor agonist DAGO or antagonist CTAP preserved only the response to DAGO; treatment with the selective delta-receptor agonist DPDPE or antagonist naltrindole preserved only the response to DPPE; and treatment with the selective kappa-receptor agonist U50,488H or antagonist nor-binaltorphimine preserved only the response to U50,488H. The results established the presence of distinct kappa-, delta-, and mu-opioid receptors capable of mediating contraction of isolated gastric muscle cells. The pattern of interaction of endogenous opioid peptides with protected receptors implied that dynorphin-(1-13) and Met-enkephalin were selective agonists for kappa- and delta-opioid receptors, respectively, and Leu-enkephalin a preferential agonist of mu-opioid receptors. The results were confirmed by a reverse approach in which opioid receptors were inactivated by site-directed irreversible antagonists. beta-Funaltrexamine, a mu-selective antagonist, abolished the response to mu-receptor agonists, whereas beta-chlornaltrexamine, a mu- and kappa-selective antagonist, abolished the response to mu-receptor agonists and partially inhibited the response to kappa-receptor agonists.lld:pubmed
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pubmed-article:1670978pubmed:authorpubmed-author:MakhloufG MGMlld:pubmed
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pubmed-article:1670978pubmed:articleTitleIdentification of opioid receptors on gastric muscle cells by selective receptor protection.lld:pubmed
pubmed-article:1670978pubmed:affiliationDepartment of Physiology, Medical College of Virginia, Richmond 23298-0711.lld:pubmed
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