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Thymoquinone From Nigella Sativa Was More Potent Than Cisplatin in Eliminating of SiHa Cells via Apoptosis With Down-Regulation of Bcl-2 Protein
Posted by Admin, Senior Editor in Nigella Sativa (Black Seed)
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Ng WK, Yazan LS, Ismail M. Thymoquinone from nigella sativa was more potent than cisplatin in eliminating of SiHa cells via apoptosis with down-regulation of Bcl-2 protein. 1. Toxicol In Vitro. 2011 Oct;25(7):1392-8. Epub 2011 May 15.
Thymoquinone (TQ), the active constituent of nigella sativa or black cumin exhibited cytotoxic effects in several cancer cell lines. In this study, the cytotoxicity of TQ in human cervical squamous carcinoma cells (SiHa) was investigated. TQ was cytotoxic towards SiHa cells with IC50 values of 10.67 ? 0.12 and 9.33 ? 0.19 ?g/mL as determined by MTT assay and trypan blue dye exclusion test, respectively, after 72 h of incubation. TQ was more cytotoxic towards SiHa cells compared to cisplatin. Interestingly, TQ was less cytotoxic towards the normal cells (3T3-L1 and Vero). Cell cycle analysis performed by flowcytometer showed a significant increase in the accumulation of TQ-treated cells at sub-G1 phase, indicating induction of apoptosis by the compound. Apoptosis induction by TQ was further confirmed by Annexin V/PI and AO/PI staining. Significant elevation of p53 and down-regulation of the anti-apoptotic Bcl-2 protein was found in the treated cells, without any changes in the expression of the pro-apoptotic Bax protein. In conclusion, thymoquinone from N. sativa was more potent than cisplatin in elimination of SiHa cells via apoptosis with down-regulation of Bcl-2 protein.


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