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[Mechanism of action of interferon is linked to its ability to protect the cell from interstrand cross-linking of DNA, induced by 8-methoxypsoralen, activated by long-wave UV-light].

Treatment of human lymphocytes in the G1 phase of mitotic cycle with human lymphoblastoid interferon (Ly-IFN) decreased the frequencies of chromosome aberrations induced by 8-methoxy-psoralen-induced interstrand cross-links. Anticlastogenic effect of Ly-IFN was accompanied by stimulation of unscheduled synthesis of DNA in the G2 phase of mitotic cycle, as shown by increased percent of labeled cells registered by 3H-thymidine autoradiography. The data obtained seem to indicate that the mechanism of Ly-IFN protection is connected with stimulation of postreplicative repair.