Enhancement by methylxanthines of sister-chromatid exchange frequency induced by cytostatics in normal and leukemic human lymphocytes
The effect of theobromine (TB) and diphylline (DP) or (1,2-dihydroxy-3-propyl)theophylline on SCE rates induced in vitro by mitomycin C (MMC), and the effect of caffeine on SCE rates induced in vitro by cytosine arabinoside (Ara-C) was studied. The combined treatments with MMC plus TB or DP showed the potentiating ability of the latter drugs. Caffeine also enhanced SCEs induced by Ara-C in cultured human lymphocytes. Caffeine and adriamycin (ADR) did not act synergistically on induction of SCEs. In a combined study, in vivo and in vitro, lymphocytes taken from 2 leukemic patients who had been given chlorambucil (CBC) or Ara-C by injection 3 h before, and then treated with caffeine in vitro, were found to have synergistically increased exchange frequencies
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