ABSTRACT
Cell culture is a process in which the cells ware isolated from original tissue, dispersed in liquid media and then placed in culture plate where the cells adhere together and propagate. Today, this method is used for assessment of cell toxicity, its mechanisms and effect of different compounds on intracellular components. Clonogenic assay was used for assessment of cell toxicity and amount of cell death after a specific time during which cells were exposed to different compounds. Thus, IC50 in caner cell lines [HePG2, SKOV3 and A549] and normal cell [LLCPK1, CHO and HGF1] was assessed after exposure to cisplatin, acetaminophen and arsenic. Results showed that acetaminophen has maximum resistance and minimum sensitivity in CHO line with IC50 = 16.7 +/- 1.06 HePG2 with IC50 = 18.6 +/- 1.29. On the other hand, cisplatin showed minimum resistance and maximum sensitivity in HePG2 with IC50 = 0.87 +/- 0.07 and HGF1 with IC50 = 1.6 +/- 0.21 and lastly, arsenic showed minimum resistance and maximum sensitivity in A549 with IC50 = 4.59 +/- 0.29 and LLCPK1 with IC50-1 +/- 0.37. According to the evaluated IC50, there were differences between results of sensitivity of cell lines exposed to the three drugs [P < 0.05]. Entirely, resistance in cancer cell lines was lower than normal cells. The results showed the importance of cell defensive mechanisms encountering different substances like glutathione