The radioprotector 2-[aminopropyl)amino] ethanethiol (WR1065), which has been reported to reduce the cytotoxic and mutagenic effects of low LET radiation, was investigated for its ability to protect against low LET (60Co γ ray) and high LET (fission-spectrum neutron)-induced chromosome damage in V79 cells. Cells were irradiated in G2 phase in the presence or absence of 4 mM WR1065 and were harvested and analyzed 2 h later for chromatid-type aberrations. Irradiation of G 2-phase V79 cells in the presence of WR1065 resulted in a 30 to 50% reduction in the frequency of ?-ray and neutron-induced chromatid-type breaks and exchanges. The effects were found only after exposures of greater than 200 cGy γ-ray or 50 cGy neutron irradiation. The radioprotector was effective at reducing neutron-induced aberrations after exposures at dose rates of both 10 and 43 cGy/min. Thus the radioprotector WR1065 is an effective anticlastogenic agent in V79 cells, protecting against both 60Co γ-ray and fission-spectrum neutron-induced aberrations, when present during irradiation.

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