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The effect of sodium bisulfite, a specific inhibitor of chromatin proteolysis, on radiation damage in rat thymocytes in vitro was examined. Rat thymocytes irradiated with 1 kR X rays in vitro were incubated at 37 degrees C with 10 mM glucose for 4 to 6 hr. During that time development of interphase death as judged by erythrosin B uptake, release of low molecular weight DNA (free DNA), and reduction in cell size was measured. Sodium bisulfite added to the cells at the beginning of incubation exerted a marked preventive effect on radiation damage. The effect was enhanced with increasing concentration of bisulfite from 0.25 to 2 mM. The effect of bisulfite was reversible; i.e., removal of bisulfite from the cells resulted in the reappearance of the radiation damage.
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