Central Nervous System Regulation of Adrenocorticotropin Secretion: Role of Somatostatins*

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Abstract
Somatostatin-28 (SS-28) and desAA1,2,4,5,12,13[dTrp8] somatostatin (ODT8-SS), but not somatostatin-14, given intracerebroventricularly, but not when given iv, inhibit stressinduced pituitary ACTH and adrenomedullary epinephrine secretion in rats. The elevation of ACTH after tail-suspension stress is totally prevented by iv administration of antisera raised against corticotropin-releasing factor (CRF). SS-28 and ODT8-SS do not inhibit CRF-induced ACTH secretion in vivo or in vitro. These results are consistent with the hypothesis that SS-28 and ODT8-SS prevent stress-induced ACTH secretion by inhibition of CRF release. (Endocrinology114: 1546, 1984)