[The effect of polyene antibiotics on fractions of DNP both bound and not bound to dog kidney nuclear membranes].

Effects of amphotericine B and nistatine on nuclear membrane-bound DNP (DNPm) and free DNP (DNPf) from dog kidney are studied. Intravenous injection of amphotericine B resulted in the increase of binding of DNP particles with nuclear membrane: the content of DNA in DNPm fraction was 50-fold increased. The injection of nistatine did not affect DNP binding with nuclear membrane. Amphotericine B alone increased the protein-DNA ratio and decreased the RNA/DNA ratio in DNPf fraction. Both amphotericine B and nistatine sharply increased the protein/DNA ratio and practically did not change the RNA/DNA ratio in DNPm fraction. Amphotericine B produced considerable changes in temperature denaturation of DNA in DNPo, while nistatine produced no effect. Both antibiotics considerably changed the composition of acid soluble proteins in DNPm and DNPf, non-histone proteins in DNPf, and also they caused the changed and quantitative redistribution of separate lipid components in DNPm lipids. Polyene antibiotics are suggested to effect on animal cell nuclear structures.