[Kinetics and energy aspects of the effect of incubation medium dielectric permeability on the catalytic and transporting activity of Mg2+-ATP-dependent Ca2+ pump plasma membranes].

: The effects of subacute, acute and chronic ethanol exposure on the activity of Ca(2+)-accumulating systems of mitochondria and endoplasmic reticulum in myometrial cells of nonpregnant estrogen-treated rats were studied. It has been shown that the activity of Ca(2+)-accumulating system of mitochondria was higher than the activity of Ca(2+)-accumulating system of endoplasmic reticulum in myometrial cells from control, acute and subacute treated with ethanol rats. Under ethanol chronical assumption both Ca(2+)-accumulation in mitochondria and Ca(2+)-transporting activity of endoplasmic reticulum are inhibited. In the latter ease Mg2+, ATP-dependent Ca(2+)-pump lost its sensitivity to oxytocin.