Effects of ehtanol on acid secretion by isolated parietal cell from guinea pig.

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We studied the effects of ethanol (0.1-10%) on acid secretion of parietal cell-rich fractions isolated from guinea pig gastric mucosa. Ethanol (0.1-3%) increased histamine-stimulated cAMP content, while over 1% ethanol decreased histamine-stimulated acid secretion. H+, K+-ATPase activity in microsomal fraction also decreased after treatment with 3% ethanol. Thus, ethanol may disturb the signalling process from CAMP to H+, K+-ATPase.On the other hand, carbachol-stimulated acid secretion was more sensitive to ethanol than that with histamine, and 0.1% ethanol suppressed the acid secretion. This effect was well correlated with the extent of the ethanol-induced increase of [Ca2+]i and with the attenuation of [Ca2+]i response following carbachol stimulation. The calcium response may be a primary target against ethanol in carbachol-dependent process.In conclusion, low-dose ethanol have multi-effects on these critical intermediary steps in acid secretion.
財団法人日本消化器病学会の論文