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Somatostatin has been found to inhibit secretion vesicle fusion with the iodinated (125-I) inside-out plasma membrane vesicles (both were isolated from the anterior pituitaries). This effect of somatostatin was specific and dose-dependent (half-maximal effect at 10(-9) M). Calmodulin (10 microM), but not cyclic AMP, enhanced the fusion process between the two organelles and somatostatin inhibited calmodulin-stimulated fusion. These observations suggest that one facet of somatostatin action on hormone secretion may be its inhibition of secretion vesicle fusion with the plasma membrane.
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