Abstract
9-Bromo-5-morpholino-tetrazolo[1,5-c]quinazoline (BMTQ) acted cytotoxically on murine leukemia cell line L1210 and human colon carcinoma cells Caco-2. We found the two highest concentrations of BMTQ (149.2 and 74.6 μM) induced an acute cytotoxic effect, however other tested concentrations (<74.6 μM) manifested a concentration/dependent and time/dependent cytotoxic effect. The sensitivity of murine leukemia cells L1210 and human colon carcinoma cells Caco-2 was expressed in the same order. The cytotoxicity of BMTQ was not accompanied by changes of the cell cycle profile. Following the cytotoxicity-related effects of BMTQ we observed the induction of ssDNA breaks after BMTQ treatment. All the concentrations of BMTQ increased the level of ssDNA breaks 1.3–2.9 times (after 2 h of treatment) and 1.6–2.8 times (after 4 h of treatment) in Caco-2 cells compared to the control. No apoptotic DNA fragmentation induced by BMTQ in Caco-2 cells was recorded.
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