Faculty Collaboration Database

Endothelial metabolism of angiotensin II to angiotensin III, not angiotensin (1-7), augments the vasorelaxation response in adrenal cortical arteries. Endocrinology 2013 Dec;154(12):4768-76

Date

10/05/2013

Pubmed ID

24092640

Pubmed Central ID

PMC3836075

DOI

10.1210/en.2013-1160

Scopus ID

2-s2.0-84888263542 (requires institutional sign-in at Scopus site)   11 Citations

Abstract

Hyperaldosteronism is linked to the development and progression of several different cardiovascular diseases. Angiotensin (Ang) II increases aldosterone secretion and adrenal blood flow. Ang II peptide fragments are produced by various peptidases, and these Angs have diverse and vital physiologic roles. Due to the uncharacteristic vasorelaxation of adrenal arteries by Ang II, we tested the hypothesis that Ang II metabolism contributes to its relaxant activity in adrenal arteries. Metabolism of Angs by bovine adrenal cortical arteries and isolated bovine adrenal vascular cells was measured by liquid chromatography-mass spectrometry. The primary Ang metabolites of adrenal arteries are Ang III and Ang (1-7), with Ang IV produced to a lesser extent. Bovine microvascular endothelial cells produced a similar metabolic profile to adrenal arteries, whereas bovine adrenal artery smooth muscle cells exhibited less metabolism. In preconstricted adrenal arteries, Ang II caused relaxation in picomolar concentrations and constrictions at 10nM. Ang-converting enzyme 2 inhibition augmented this relaxation response, whereas aminopeptidase inhibition did not. Ang III was equipotent to Ang II in relaxing adrenal arteries. Ang IV did not cause relaxation. Nitric oxide synthase inhibition enhanced Ang II-induced constriction of adrenal arteries. Aminopeptidase inhibition increased the concentration range for Ang II-induced constriction of adrenal arteries. Ang III and Ang IV did not change the basal tone but caused constriction of adrenal arteries with nitric oxide synthase inhibition. These data indicate that Ang II metabolism modulates the vascular effects of Ang II in the adrenal vasculature.

Author List

Kopf PG, Campbell WB

Author

William B. Campbell PhD Professor in the Pharmacology and Toxicology department at Medical College of Wisconsin

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

Adrenal Glands
Angiotensin I
Angiotensin II
Angiotensin III
Animals
Cattle
Cells, Cultured
Endothelial Cells
Endothelium, Vascular
Gene Expression Regulation
Peptide Fragments
Vasodilation