Faculty Collaboration Database

Mechanisms of histamine-induced relaxation in bovine small adrenal cortical arteries. Am J Physiol Endocrinol Metab 2005 Dec;289(6):E1058-63

Date

08/04/2005

Pubmed ID

16076876

DOI

10.1152/ajpendo.00162.2005

Scopus ID

2-s2.0-33644678022 (requires institutional sign-in at Scopus site)   9 Citations

Abstract

Adrenal steroidogenesis is closely correlated with increases in adrenal blood flow. Many reports have studied the regulation of adrenal blood flow in vivo and in perfused glands, but until recently few studies have been conducted on isolated adrenal arteries. The present study examined vasomotor responses of isolated bovine small adrenal cortical arteries to histamine, an endogenous vasoactive compound, and its mechanism of action. In U-46619-precontracted arteries, histamine (10(-9)-5 x 10(-6) M) elicited concentration-dependent relaxations. The relaxations were blocked by the H(1) receptor antagonists diphenhydramine (10 microM) or mepyramine (1 microM) (maximal relaxations of 18 +/- 6 and 22 +/- 6%, respectively, vs. 55 +/- 5% of control) but only partially inhibited by the H(2) receptor antagonist cimetidine (10 microM) and the H(3) receptor antagonist thioperamide (1 microM). Histamine-induced relaxations were also blocked by the nitric oxide synthase inhibitor N-nitro-L-arginine (L-NA, 30 microM; maximal relaxation of 13 +/- 7%) and eliminated by endothelial removal or L-NA combined with the cyclooxgenase inhibitor indomethacin (10 microM). In the presence of adrenal zona glomerulosa (ZG) cells, histamine did not induce further relaxations compared with histamine alone. Histamine (10(-7)-10(-5) M) concentration-dependently increased aldosterone production by adrenal ZG cells. Compound 48/80 (10 microg/ml), a mast cell degranulator, induced significant relaxations (93 +/- 0.6%), which were blocked by L-NA plus indomethacin or endothelium removal, partially inhibited by the combination of the H(1), H(2), and H(3) receptor antagonists, but not affected by the mast cell stabilizer sodium cromoglycate (1 mM). These results demonstrate that histamine causes direct relaxation of small adrenal cortical arteries, which is largely mediated by endothelial NO and prostaglandins via H(1) receptors. The potential role of histamine in linking adrenal vascular events and steroid secretion requires further investigation.

Author List

Zhang DX, Gauthier KM, Campbell WB

Authors

William B. Campbell PhD Professor in the Pharmacology and Toxicology department at Medical College of Wisconsin
David X. Zhang MD, PhD Associate Professor in the Medicine department at Medical College of Wisconsin

MESH terms used to index this publication - Major topics in bold

Adrenal Cortex
Aldosterone
Animals
Arteries
Cattle
Cells, Cultured
Endothelium, Vascular
Histamine
Muscle Contraction
Muscle Relaxation
Muscle, Smooth, Vascular
Zona Glomerulosa
p-Methoxy-N-methylphenethylamine