Rapid Rejoining of DNA Strand Breaks in Resting Human Lymphocytes after Irradiation by Low Doses of 60 Co g Rays or 14.6-MeV Neutrons

Abstract

The production and repair of DNA strand breaks was studied in human lymphocytes by means of a sensitive fluorometric technique. Lymphocytes were isolated by conventional methods and air-equilibrated suspensions were irradiated by low doses (≤2 Gy) of either ⁶⁰ Co γ rays or 14.6-MeV neutrons at 0°C. The apparent yield of initial strand breaks induced by neutrons was only 36% of that induced by γ rays, in agreement with the observations of other workers. Resting lymphocytes were found to be proficient in their ability to rejoin γ-induced strand breaks at 37°C; rejoining followed biphasic kinetics, with 70% of the breaks disappearing with a half-life of about 3 min. Although the initial number of breaks induced by neutron irradiation was low, after 20 min of incubation the residual number of breaks was very similar for the two forms of radiation.