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    188宝金博页面版: 【精品】Effects of micromolar concentrations of Mn, Mo, and Si on α

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    内容提示： ?9 1998 by Humana Press Inc. All rights of any nature, whatsoever, reserved. 0163-4984/98/6401-3~075 $11.25 Effects of Micromolar Concentrations of Mn, Mo, and Si on o/1- Adrenoceptor-Mediated Contraction in Porcine Coronary Artery MING YAN, 1'* ZHIZHEN Lu,' XIAO-JUN Du, 2 AND CHIDE HAN 1 'Institution of Vascular Medicine, The Third Hospital, Beijing Medical University, Beijing, P. R. China, 2Baker Medical Research Institute, Melbourne, Victoria, Australia Received June 17, 1997; Accepted September 30, 199...

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    ?9 1998 by Humana Press Inc. All rights of any nature, whatsoever, reserved. 0163-4984/98/6401-3~075 $11.25 Effects of Micromolar Concentrations of Mn, Mo, and Si on o/1- Adrenoceptor-Mediated Contraction in Porcine Coronary Artery MING YAN, 1'* ZHIZHEN Lu,' XIAO-JUN Du, 2 AND CHIDE HAN 1 'Institution of Vascular Medicine, The Third Hospital, Beijing Medical University, Beijing, P. R. China, 2Baker Medical Research Institute, Melbourne, Victoria, Australia Received June 17, 1997; Accepted September 30, 1997 ABSTRACT We studied the effects of trace elements, Mn, Mo, and Si, on vasoconstriction induced by norepinephrine (NE) or electrical field stimulation in isolated porcine right coronary arteries. ~l-Adren- oceptor (AR) antagonist prazosin dose-despondently suppressed vasoconstriction in response to NE or field stimulation indicating an 0h-AR mediated response. Mn, Mo, and Si at 0.3-3 ~tmol/L dose- despondently inhibited NE mediated contraction (all p < 0.05). In con- trast, Mn, Mo, and Si at the same concentrations (0.3-3 ~tmol/L) enhanced the maximal contractile response to field stimulation in a dose-dependent manner (all p < 0.05), but these elements at 10 ~tmol/L suppressed the vasoconstrictive response. The results indicate that in porcine right coronary arteries, the ~l-AR-mediated vasoconstriction by NE or electrical field stimulation was affected differently by micro- molar concentrations of Mn, Mo, and Si and that the elements might facilitate NE release presynaptically but inhibit the contractile response postsynaptically. Index Entries: Rl-adrenoceptor; trace elements; manganese; molybdenum; silicon; coronary artery; electrical field stimulation. *Current address and address for correspondence: Dr. Ming Yan, Department of Cardiology, Box Hill Hospital, Victoria 3128, Australia. Phone: +61 3 9895 4832; Fax: +61 3 9895 0332. Biological Trace Element Research 75 Vol. 64, 1998

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