Ota S, Yoshiura K, Takahashi M, Hata Y, Kohmoto O, Kawabe T, Shimada T, Hiraishi H, Mutoh H, Terano A. P2 purinergic receptor regulation of mucus glycoprotein secretion by rabbit gastric mucous cells in a primary culture.
Gastroenterology 1994;
106:1485-92. [PMID:
8194693 DOI:
10.1016/0016-5085(94)90401-4]
[Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
BACKGROUND/AIMS
Physiological regulation of gastric mucus secretion has not been well studied. The present study investigated the effects of adenosine 5'-triphosphate (ATP), a P2 purinergic receptor agonist, and its analogues on gastric mucus secretion using gastric mucous cells in a primary culture.
METHODS
A monolayer culture of gastric mucous cells from adult rabbits were prepared after enzyme digestion. Mucus secretion was estimated from the release of [3H]glucosamine from prelabeled cells. Intracellular calcium concentration ([Ca2+]i) was monitored by a Ca(2+)-sensitive probe, indo-1. Prostaglandin E2 (PGE2) in the media was measured by an enzyme-linked immunoassay.
RESULTS
ATP significantly stimulated mucus secretion by these cells at nontoxic doses in a dose-dependent fashion. The order of potency of ATP analogues stimulating mucus secretion was alpha beta-methylene ATP > ATP > 2-methylthio ATP, whereas adenosine, a P1 purinergic receptor agonist, had no effect. ATP also induced an elevation of [Ca2+]i in a dose-dependent fashion. The efficacy of ATP analogues to increase [Ca2+]i showed a similar potency to their actions on mucus secretion. ATP increased PGE2 at relatively higher concentrations, whereas indomethacin did not block ATP-induced increase of mucus secretion.
CONCLUSIONS
These results suggest that ATP stimulates mucus secretion by gastric mucous cells through P2 purinergic receptors; this appears to be mediated by intracellular calcium not by endogenous PGE2.
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