ABSTRACT
The purpose of this study is to evaluate the effect of Curcuma longa extract on the telomerase gene expression in QU-DB lung cancer and T47D breast cancer cell lines. The present study is an experimental research. Using 3 different phases n-hexane, dichloromethane and methanol, total extract of Curcuma longa in a serial dilution was prepared and three phases was analyzed for determining which phase has more curcuminoids. Then the extract cytotoxicity effect was tested on breast cancer cell line [T47D], and lung cancer cell line [QU-DB] by 24, 48 and 72 h MTT [Dimethyl thiazolyl diphenyl tetrazolium] assay. Then, the cells were treated with serial concentrations of the extract. Finally, total protein was extracted from the control and test groups, its quantity was determined and telomeric repeat amplification protocol [TRAP] assay was performed for measurement of possible inhibition of the telomerase activity. Cell viability and MTT-based cytotoxicity assay show that the total extract of Curcuma longa has cytotoxic effect with different IC50s in breast and lung cancer cell lines. Analysis of TRAP assay also shows a significant reduction in telomerase activity on both cancer cells with different levels. Curcuma longa extract has anti-proliferation and telomerase inhibitory effects on QU-DB lung cancer and T47D breast cancer cells with differences in levels of telomerase inhibition