[Effect of zinc on the activities of ATPase of erythrocyte membrane].

The effects of zinc on the activities of Na+, K(+)-ATPase and Ca2+, Mg(2+)-ATPase of erythrocyte membrane were studied both in vivo and in vitro. Male adult rats were divided into three groups and fed on diets with different concentration of zinc (2.2, 28 and 128 mg/kg diet). Eight rats of each group were sacrificed after 25 days and the activities of the two ATPase were measured. The rest rats were changed diet for an other seven days to detect the sensitivities of the ATPases. The activities of these ATPase were also determined in fresh human erythrocyte membrane treated with different concentration of zinc (0, 5, 10, 50, 100, 500 mumol/L). The results showed that the activities of both Na+, K(+)-ATPase and Ca2+, Mg(2+)-ATPase were in close relationship with zinc concentration, too low or too high zinc could decrease them. Compared with Na+, K(+)-ATPase, Ca2+, Mg(2+)-ATPase was more sensitive to zinc deficiency and in a slower reaction to zinc supplement, but it could stand higher zinc concentration. It was concluded that zinc played an important role on maintaining the normal activities of Na+, K(+)-ATPase and Ca2+, Mg(2+)-ATPase.