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The effects of a synthetic enkephalin analogue with prolonged opioid activity, D-ala-2-enkephalin (ala-enk) and naloxone given alone or in combination, on vagally, pentagastrin- and histamine-induced gastric secretion and plasma hormonal responses to vagal stimulation have been studied in healthy subjects. D-ala-2-enkephalin reduced basal gastric acid and pepsin secretion, and caused a dose-dependent inhibition of gastric secretory responses to modified sham-feeding and pentagastrin but not to histamine. It increased serum gastrin concentration and suppressed plasma pancreatic polypeptide response to modified sham-feeding. Naloxone alone at lower dose levels did not affect gastric secretion and plasma hormonal concentrations but at higher doses it reduced both basal and modified sham-feeding-induced secretion. When combined with ala-enk it reversed in part gastric secretory and plasma hormonal changes induced by this peptide during modified sham-feeding and pentagastrin stimulation. These results indicate that (1) stable enkaphalin analogue inhibits basal and vagally or pentagastrin-induced gastric secretion, and affects plasma hormonal response to vagal stimulation, at least in part, via activation of opioid receptors and (2) endogenous opioid substances may be involved in the stimulation of gastric secretion in man.
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W Obtułowicz, and
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J Oleksy, and
D H Coy
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D H Coy
July 1982,
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S J Konturek, and
N Kwiecień, and
W Obtułowicz, and
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D H Coy
January 1982,
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S J Konturek, and
N Kwiecień, and
W Obtułowicz, and
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W Bielański, and
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D H Coy
July 1982,
Gastroenterology,
S J Konturek, and
N Kwiecień, and
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July 1983,
Gastroenterology,
S J Konturek, and
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October 1988,
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S J Konturek, and
N Kwiecień, and
W Obtułowicz, and
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W Bielański, and
J Oleksy, and
D H Coy
November 1982,
Regulatory peptides,
S J Konturek, and
N Kwiecień, and
W Obtułowicz, and
J Swierczek, and
W Bielański, and
J Oleksy, and
D H Coy
October 1991,
Gastroenterology,
S J Konturek, and
N Kwiecień, and
W Obtułowicz, and
J Swierczek, and
W Bielański, and
J Oleksy, and
D H Coy
January 1982,
Biology of the neonate,
S J Konturek, and
N Kwiecień, and
W Obtułowicz, and
J Swierczek, and
W Bielański, and
J Oleksy, and
D H Coy
December 1982,
The Journal of clinical endocrinology and metabolism,
