The present study was carried out to define which bombesin receptors are involved in the delay of gastric emptying induced by bombesin-like peptides. Adult male rats were fitted with gastric and jugular vein cannulas. Gastric emptying was determined 5 min after a 3-ml intragastric load of 0.9 M NaCl using phenol red as a marker. Mammalian bombesin-like peptides gastrin-releasing peptide-10 and neuromedin B both induced a delay of gastric emptying. When [Phe6]bombesin-(6-13)-methyl ester, a selective antagonist of the gastrin-releasing peptide-preferring subtype of bombesin receptors, was injected 5 min before the agonists, the effect of gastrin-releasing peptide-10 was competitively inhibited, whereas that of neuromedin B remained unaffected. Our results indicate that gastrin-releasing peptide-10 and neuromedin B delay gastric emptying by acting on distinct receptors in rats, in vivo.
Distinct receptors mediate gastrin-releasing peptide and neuromedin beta-induced delay of gastric of liquids in rats / Varga G;Liehr RM;Scarpignato C;Coy DH. - In: EUROPEAN JOURNAL OF PHARMACOLOGY. - ISSN 0014-2999. - 286:1(1995), pp. 109-112. [10.1016/0014-2999(95)00567-5]
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