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(Hypertension. 1995;25:170-173.)
© 1995 American Heart Association, Inc.

Articles

Production of Aldosterone in Isolated Rat Blood Vessels

Yoshiyu Takeda; Isamu Miyamori; Takashi Yoneda; Kazuhiro Iki; Haruhiko Hatakeyama; Ian A. Blair; Feng-Yin Hsieh; Ryoyu Takeda

From the Second Department of Internal Medicine, School of Medicine, Kanazawa (Japan) University (Y.T., I.M., T.Y., K.I., H.H., R.T.), and the Division of Clinical Pharmacology, Mass Spectrometry Resource, School of Medicine, Vanderbilt University, Nashville, Tenn (I.A.B., F.-Y.H.).

Abstract Angiotensin I (Ang I), Ang II, angiotensinogen, and renin are formed locally in the vasculature. We undertook this study to determine whether the rat mesenteric artery produces aldosterone and to investigate the effects of adrenalectomy, an angiotensin-converting enzyme inhibitor, Ang II, or potassium on aldosterone production in vascular tissue. Isolated rat mesenteric arteries were perfused with Krebs-Ringer solution for 4 hours. The perfusate was collected and chromatographed in a reversed-phase high-performance liquid chromatographic (HPLC) system. The fraction corresponding to synthetic aldosterone was collected and analyzed by mass spectrometry. The aldosterone concentration in the perfusate from the adrenalectomized rats and rats treated with an angiotensin-converting enzyme inhibitor was measured using radioimmunoassay after HPLC separation. The mass spectra of synthetic aldosterone and aldosterone isolated from the perfusate of rat mesenteric arteries were identical. Aldosterone production in the mesenteric arteries of adrenalectomized rats was increased and of rats treated with an angiotensin-converting enzyme inhibitor was reduced compared with that of controls. Ang II (1.9x10^-10 mol/L) and potassium (6.0 mmol/L) increased aldosterone production in mesenteric arteries. This study shows that the rat mesenteric artery produces aldosterone and that the intravascular renin-angiotensin-aldosterone system may contribute to vascular tone.

Key Words: aldosterone • mesenteric artery • rats • adrenalectomy • angiotensin I–converting enzyme inhibitors • angiotensin II

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