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Differences in alpha2-adrenoceptor modulation of calcium channels in vascular smooth muscle cells of male and female rats.

Effects of the alpha2-adrenergic agonist clonidine on current through Ca2+ channels was recorded from vascular smooth muscle cells isolated from tail arteries and aortae of male and female rats. The average Ba2+ current in control was not significantly different between males and females; however, clonidine (1 microM) enhanced Ba2+ current through Ca2+ channels in cells from females, but not from males. The greater sensitivity of vascular smooth muscle cells to clonidine may underlie different contractile responses to alpha2-adrenergic agonists between males and females.