Comparison of Anticancer Activity of Hydroalcoholic Extracts of <i>Curcuma longa</i> L., <i>Peganum harmala</i> L., and <i>Boswellia serrata</i> on HeLa cells
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Background: Cervical cancer is the second most common cancer in women. Several native Iranian herbs used in traditional medicine are proven to have cytotoxic effects. Objectives: The present study was designed to compare the anticancer effects of three medicinal herbs, Peganum harmala L., Curcuma longa L., and Boswellia serrata, on a cervical cancer cell line (HeLa). Methods: HeLa cells were exposed to different doses of hydroalcoholic extracts of the three plants (12.5, 25, 50, 100, and 200 µg/mL) for 24, 48, 72, and 96 hours. After the incubation period, the modified colorimetric MTT assay was used to determine cytotoxicity. Results: The highest percentage of cell death for P. harmala was observed after 72 hours of incubation, and 50% growth inhibitory concentration (IC50) at 24 hours was 12.5 μg/mL. For B. serrata, the highest percentage of cell death was observed after 72 hours of incubation; IC50 at 24 and 48 hours were 50 μg/mL and 12.5 μg/mL, respectively. C. longa L. had an IC50 of 12.5 μg/mL after 72 hours of incubation. Conclusions: The results of the MTT assay showed that B. serrata and P. harmala L. extracts had time- and dose-dependent cytotoxic effects. However, C. longa L. extracts induced apoptosis only in a time-dependent manner. A higher cytotoxic effect was observed on HeLa cells with P. harmala and B. serrata extracts compared to C. longa extract at all applied concentrations.