[Changes in ATPase activity of dog kidney nuclear membrane under the effect of polyenic antibiotics].

Effect of amphotericin B and nistatin on ATPase activity of dog kidney nuclear membranes is studied in vivo and in vitro. Long-term intravenous injections of the antibiotics do not change the ATPase activity of kidney nuclear membranes. However, short-term injections of polyenic antibiotics have some effect on ATPase activity on nuclear membranes: amphotericin B, considerably activates the enzyme . In vitro incubation of isolated dog kidney nuclei with amphotericin and nistatin at concentrations of 1 and 10 mcg/ml does not affect the activity of nuclear membrane ATPase, while increased concentrations of polyenic antibiotics, (up to 200 mcg/ml) results in a slight inhibition of the enzyme activity. The role of the data obtained for solving molecular basis of the toxic effect of polyenic antibiotics.