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AJP - Gastrointestinal and Liver Physiology, Vol 260, Issue 6 925-G928, Copyright © 1991 by American Physiological Society
ARTICLES |
A. K. Sandvik and H. L. Waldum
Department of Medicine, University Hospital, Trondheim, Norway.
To study the interdependence between gastric histamine release and acid secretion, we examined the effects of gastrin-(1-17) [G-(1-17)] or cholecystokinin-(1-33) [CCK-(1-33)] alone or combined with the gastrin (CCK-B) antagonist L365,260 or the CCK-A antagonist L364,718 in the isolated vascularly perfused rat stomach. G-(1-17) and CCK-(1-33) gave concentration-dependent increases in acid secretion and histamine release. Gastrin or CCK-A antagonist alone did not stimulate histamine release or acid secretion. Maximally G-(1-17) or CCK-(1-33) stimulated histamine release and acid secretion was unchanged by the CCK-A antagonist, while the gastrin antagonist induced a parallel and concentration-dependent decrease in stimulated histamine and acid secretion. We conclude that G-(1-17) and CCK-(1-33) stimulate histamine and acid secretion by a CCK-B (gastrin) receptor. The present results indicate that gastrin, at least in this species, stimulates acid secretion by releasing histamine.
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