Liu DL, Yan M, Chua YL, Chen C, Lim YL. Effects of molybdenum, silicon and nickel on alpha1-adrenoceptor-induced constriction of rat isolated aorta.
Clin Exp Pharmacol Physiol 2002;
29:395-8. [PMID:
12010182 DOI:
10.1046/j.1440-1681.2002.03674.x]
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Abstract
1. To determine the effects of trace elements on alpha1-adrenoceptor-mediated vasoconstriction, we studied the effects of molybdenum (Mo), silicon (Si) and nickel (Ni) on vasoconstrictor response to an alpha1-adrenoceptor agonist in rat aorta. 2. Cumulative concentration-contraction curves were obtained for phenylephrine (1 nmol/L-10 micromol/L) in the absence and presence of Mo, Si and Ni (0.3, 1 and 3 micromol/L) in rat aorta rings. Increasing the concentration of Mo and Si from 0.3 to 3 micromol/L shifted the cumulative concentration-contraction curve to the right, but did not reduce the maximal contractile response to phenylephrine. In contrast, Ni at 1 and 3 micromol/L shifted the cumulative concentration-contraction curve to the right and, at 3 micromol/L, reduced the maximum contractile response to phenylephrine. 3. We conclude that micromolar concentrations of Mo, Si and Ni affected alpha1-adrenoceptor-induced vasoconstriction and that Ni significantly inhibited the maximal contractile response to phenylephrine in rat isolated aorta.
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