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pubmed-article:3000805pubmed:abstractTextThe effects of dermorphin and morphine on gastric acid secretion were studied in conscious dogs with both gastric fistulas (GF) and Heidenhain pouches (HP). Under basal conditions dermorphin and morphine, infused systemically at graded doses, produced a significant increase in acid secretion from both GF and HP. This increase was significantly inhibited by naloxone, naltrexone methylbromide and N-methyl-levallorphan methanesulphonate. Dermorphin did not modify the acid output stimulated by 2-deoxy-D-glucose from GF, while morphine significantly inhibited it; on the contrary acid secretion from HP was increased in this test by both dermorphin and morphine. Acid secretion from GF stimulated by pentagastrin was unaffected by morphine and significantly enhanced by dermorphin. Under these conditions a significant increase in acid secretion from HP was recorded with dermorphin and morphine. Naloxone and N-methyl-levallorphan methanesulphonate, given during pentagastrin-stimulated secretion, significantly inhibited acid output 'per se' from GF and HP and prevented the stimulatory effect of dermorphin and morphine. Bethanechol-induced secretion from GF and HP was significantly increased by both dermorphin and morphine. The present results demonstrate that opioids have simultaneous yet opposite effects on acid secretion in the dog and that mu receptors are involved in both the excitatory and inhibitory effects. Excitatory effects do not seem to be mediated via a vagal pathway (peripheral ?), in contrast to the inhibitory effects (central ?). The inhibitory effects of opiate antagonists on pentagastrin-stimulated secretion suggest a physiological role of peripheral opioid receptors in gastric acid secretion.lld:pubmed
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pubmed-article:3000805pubmed:pagination295-301lld:pubmed
pubmed-article:3000805pubmed:dateRevised2006-11-15lld:pubmed
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pubmed-article:3000805pubmed:articleTitleCentral and peripheral involvement of mu receptors in gastric secretory effects of opioids in the dog.lld:pubmed
pubmed-article:3000805pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:3000805pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed