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No radiosensitivity-related change in plasma membrane properties in X- or gamma-irradiated L5178Y-R and L5178Y-S cells.

Two strains of murine lymphoma cells, L5178Y-R (LY-R) and L5178Y-S (LY-S) differ in radiosensitivity (D0 ca 1 and 0.5, respectively), in Na+/K+ and Mg2+-ATPase activities and susceptibility to heat; their fatty acid composition is also slightly different. Nevertheless, neither Na+-dependent amino acid uptake, nor membrane fluidity change after X- or gamma-irradiation (10 Gy under aerobic conditions, 27 Gy under extreme hypoxia). Although in LY-S cells there is a decrease in partition coefficient in a two-phase system, which indicates a late (24 h after irradiation) change in surface charge, this change is not related to viability, membrane fluidity, amino acid transport and survival.