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Title: Endothelin-3 stimulates the hypothalamic-pituitary-adrenal axis. Author: Hirai M, Miyabo S, Ooya E, Miyanaga K, Aoyagi N, Kimura K, Kishida S, Nakai T. Journal: Life Sci; 1991; 48(24):2359-63. PubMed ID: 1646364. Abstract: Endothelin-3 (ET-3) is a member of the novel vasoconstrictive peptide family, identified in porcine central nervous system. Intravenous bolus injection of 1000 pmol/kg of ET-3 in freely moving rats caused significant increases in plasma ACTH and corticosterone levels, almost equivalent to those of 100 pmol/kg of rat corticotropin-releasing hormone (rCRH). The action of ET-3 was virtually abolished by pretreatment of CRH-antagonist, alpha-helical CRH. When ET-3 was added to cultured anterior pituitary cells, neither direct stimulation of ACTH release nor potentiation of rCRH action was noted. The results indicate that ET-3 may function as a neuropeptide and stimulation of the CRH-neurons, direct or inderect, is mainly responsible for activation of ACTH and corticosterone release.[Abstract] [Full Text] [Related] [New Search]