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J Clin Endocrinol Metab. 1979 May;48(5):880-2.

Phentolamine and the action of somatostatin in man.

Abstract

The inhibition by somatostatin (SRIF) of basal and arginine-stimulated glucagon, insulin, and glucose levels was compared with that obtained when SRIF was preceded by alpha-adrenergic blockade with phentolamine. No noteworthy differences were observed, except that the characteristic rebound of insulin upon discontinuation of SRIF was significantly lower with phentolamine (P less than 0.01). These results indicate that inhibition of basal and arginine-stimulated glucagon and insulin secretion by SRIF in man is not mediated through activation by alpha-adrenergic receptors.

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