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Effect of TPA (12-O-tetradecanoyl phorbol-13-acetate), a potent tumor promoter, on immunoreactive somatostatin release was investigated using the isolated perfused rat stomach. TPA at the concentration as low as 20nM significantly stimulated the somatostatin release from isolated perfused rat stomach. The integrated net output of somatostatin induced by TPA was dose-dependent in a range of 5 - 50nM TPA. Since TPA is known to activate C-kinase specifically at a low dose (less than 20nM), these findings suggest that C-kinase system may be involved in the regulation of somatostatin release in rat stomach.
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