[Alterations in composition of sterols and in properties of erythrocyte membranes in rats with Shvetz experimental leukemia and after UV irradiation].

Amount of cholesterol was distinctly decreased but content of scvalene, lanosterol, 7-dehydrocholesterol and 7-beta-hydroxycholesterol--increased in erythrocyte membranes of rats with Shvetz experimental leukosis. At the same time, osmotic stability of erythrocytes and a pattern of acidic erythrogramms were altered. After UV irradiation of rats amount of cholesterol was increased as well as other unidentified substances appeared in erythrocyte membranes. These alterations appear to be one of factors responsible for development of body resistance to leukosis.