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Ethanol induces fluid hypersecretion from guinea-pig pancreatic duct cells

Akiko Yamamoto, Hiroshi Ishiguro, Shigeru B. H. Ko, Atsushi Suzuki, Youxue Wang, Hiroyuki Hamada, Nobumasa Mizuno, Motoji Kitagawa, Tetsuo Hayakawa and Satoru Naruse

Ethanol is the leading cause of pancreatitis; however, its cellular effects are poorly understood. We examined the direct effects of ethanol in the concentration range 0.1-30 mM, i.e. relevant to usual levels of drinking, on fluid secretion from guinea-pig pancreatic duct cells. Fluid secretion was continuously measured by monitoring the luminal volume of interlobular duct segments isolated from the guinea-pig pancreas. [Ca²⁺]_i was estimated by microfluorometry in duct cells loaded with fura-2. Ethanol at 0.3-30 mM significantly augmented fluid secretion stimulated by physiological (1 pM) or pharmacological (1 nM) concentrations of secretin. It augmented dibutyryl cAMP-stimulated fluid secretion but failed to affect spontaneous or acethylcholine-stimulated secretion. Ethanol at 1 mM shifted the secretin concentration-fluid secretion response curve upwards and raised the maximal secretory response significantly by 41 %. In secretin-stimulated ducts, 1 mM ethanol induced a transient increase in [Ca²⁺]_i that was dependent on the presence of extracellular Ca²⁺. Ethanol failed to augment secretin-stimulated secretion from ducts pretreated with an intracellular Ca²⁺ buffer (BAPTA) or a protein kinase A inhibitor (H89). In conclusion, low concentrations of ethanol directly augment pancreatic ductal fluid secretion stimulated by physiological and pharmacological concentrations of secretin, and this appears to be mediated by the activation of both the intracellular cAMP pathway and Ca²⁺ mobilization.

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