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10p.-3 fig.DNA damage repair was assessed in quiescent (G0) leukocytes and in hepatocytes of mice, after 1 and 2 hours recovery from a single whole body γ-irradiation with 0.5, 1 or 2 Gy. Evaluation of single-strand breaks (SSB)\udand alkali-labile sites together were carried out by a single-cell electrophoresis at pH>13.0 (alkaline comet assay). In non-irradiated (control) mice, the constitutive, endogenous DNA damage (basal) was around 1.5 times higher in leukocytes than in hepatocytes. Irradiation immediately increased SSB frequency in both cell types, in a dose-dependent manner. Two sequential phases took place during the in vivo repair of the radioinduced DNA lesions. The earliest one, present in both hepatocytes and leukocytes, further increased the SSB\udfrequency, making evident the processing of some primary lesions in DNA bases into the SSB repair intermediates. In a second phase, SSB frequency decreased because of their removal. In hepatocytes, such a frequency regressed to the constitutive basal level after 2 hours recovery from either 0.5 or1 Gy. On the other hand, the SSB repair phase was specifically abrogated in leukocytes, at the doses and recovery times analyzed. Thus, the efficiency of in vivo repair of radio-induced DNA damage in dormant cells (lymphocytes) is quite different from that in hepatocytes whose low proliferation activity accounts only for cell renewal.This work has been partially supported by the\udUniversidad de Chile-CSIC Agreement (Project 99CLO09), and the Mecesup Postgrado UCH (Project 9903) and also by the Dirección General de Investigación, Ministerio de Educación y Ciencia, Spain (Project BFU2004-03071)Peer reviewe

Hepatocytes, rather than leukocytes reverse DNA damage in vivo induced by whole body y-irradiation of mice, as shown by the alkaline comet assay