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Anti-Cancer Effects of Thymoquinone in Mouse Neuroblastoma (Neuro-2a) Cells Through Caspase-3 Activation With Down-Regulation of XIAP
Posted by HealthyMuslim, in Nigella Sativa (Black Seed)
Authored by PubMed
Topics: Nigella Sativa Black Seed

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Paramasivam A, Sambantham S, Shabnam J, Raghunandhakumar S, Anandan B, Rajiv R, Vijayashree Priyadharsini J, Jayaraman G. Anti-cancer effects of thymoquinone in mouse neuroblastoma (Neuro-2a) cells through caspase-3 activation with down-regulation of XIAP. 1. Toxicol Lett. 2012 Jun 23;213(2):151-159. [Epub ahead of print]
Thymoquinone (TQ) is a bioactive component derived from the medicinal plant nigella sativa. Recent studies reported that TQ exhibited cytotoxic effects in several cancer cell lines. Currently, no information in the literature is found concerning its mechanisms and cytotoxicity on neuroblastoma cells. In this study, the cytotoxicity of TQ in mouse neuroblastoma cells (Neuro-2a) was investigated. Our results showed that TQ significantly reduced viability of Neuro-2a cells than normal neuronal cells. Apoptosis induction by TQ was confirmed by DAPI and AO/PI staining. TQ triggered the apoptotic pathway, which was characterized by increased Bax/Bcl-2 ratio. TQ significantly increased the expression of pro-apoptotic protein Bax, whereas decreased the expression of anti-apoptotic protein Bcl-2, which leads to the release of cytochrome c from mitochondria into the cytoplasm. Moreover, TQ treatment directs the activation of caspase-3 followed by the cleavage of poly(ADP-ribose) polymerase (PARP). Interestingly, we also observed that TQ down-regulated caspase inhibitor X-linked inhibitor of apoptosis protein (XIAP). These results indicate that TQ induces apoptosis via caspase-3 activation with down-regulation of XIAP in Neuro-2a cells.

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