PMID: 8602117Jan 1, 1996Paper

Adrenomedullin and calcitonin gene-related peptide inhibit aldosterone secretion in rats, acting via a common receptor

Life Sciences
G MazzocchiG G Nussdorfer

Abstract

Adrenomedullin (ADM) and calcitonin gene-related peptide (CGRP) did not affect either basal or ACTH-stimulated secretion of a1dosterone and corticosterone by dispersed rat capsular and inner adrenocortical cells, respectively. However, both peptides strongly depressed angiotensin-II (ANG- II)-stimulated a1dosterone production by capsular cells, the minimal effective concentration was 10(-7) M. The inhibitory effect of both ADM and CGRP was reversed by CGRP8-37, a specific CGRP1 receptor antagonist; a complete reversal was obtained with a CGRP8-37 concentration of 10(-6) M. Our findings indicate that ADM and CGRP specifically interfere with the intracellular mechanisms transducing the secretagogue signal of ANG-II, and suggest that the ADM effect is mediated by CGRP receptors

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