Effects of Beta-lipotropin and Beta-lipotropin-derived Peptides on Aldosterone Production in the Rat Adrenal Gland

Overview

Journal J Clin Invest

Specialty General Medicine

Date 1981 Sep 1

PMID 6268663

Citations 5

Authors

H Matsuoka

P J Mulrow

R Franco-Saenz

C H Li

Affiliations

Soon will be listed here.

Abstract

To investigate the role of non-ACTH pituitary peptides on steroidogenesis, we studied the effects of synthetic beta-lipotropin, beta-melanotropin, and beta-endorphin on aldosterone and corticosterone stimulation using rat adrenal collagenase-dispersed capsular and decapsular cells. beta-lipotropin induced a significant aldosterone stimulation in a dose-dependent fashion (10 nM-1 muM). beta-endorphin, which is the carboxyterminal fragment of beta-lipotropin, did not stimulate aldosterone production at the doses used (3 nM-6 muM). beta-melanotropin, which is the middle fragment of beta-lipotropin, showed comparable effects on aldosterone stimulation. beta-lipotropin and beta-melanotropin did not affect corticosterone production in decapsular cells. Although ACTH(1-24) caused a significant increase in cyclic AMP production in capsular cells in a dose-dependent fashion (1 nM-1 muM), beta-lipotropin and beta-melanotropin did not induce an increase in cyclic AMP production at the doses used (1 nM-1 muM). The beta-melanotropin analogue (glycine[Gly](10)-beta-melanotropin) inhibited aldosterone production induced by beta-lipotropin or beta-melanotropin, but did not inhibit aldosterone production induced by ACTH(1-24) or angiotensin II. Corticotropin-inhibiting peptide (ACTH(7-38)) inhibited not only ACTH(1-24) action but also beta-lipotropin or beta-melanotropin action; however it did not affect angiotensin II-induced aldosterone production. (saralasin [Sar](1); alanine [Ala](8))-Angiotensin II inhibited the actions of beta-lipotropin and beta-melanotropin as well as angiotensin II. These results indicate that (a) beta-lipotropin and beta-melanotropin cause a significant stimulation of aldosterone production in capsular cells, (b) beta-lipotropin and beta-melanotropin have a preferential effect on zona glomerulosa cells, (c) beta-melanotropin contains the active peptide core necessary for aldosterone stimulation, (d) the effects of these peptides on aldosterone production may be independent of cyclic AMP, and (e) the receptors for beta-lipotropin or beta-melanotropin may be different from those for ACTH or angiotensin II.

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