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  • Title: Reactive oxygen species-mediated mitochondrial dysfunction is involved in apoptosis in human nasopharyngeal carcinoma CNE cells induced by Selaginella doederleinii extract.
    Author: Liu H, Peng H, Ji Z, Zhao S, Zhang Y, Wu J, Fan J, Liao J.
    Journal: J Ethnopharmacol; 2011 Oct 31; 138(1):184-91. PubMed ID: 21924341.
    Abstract:
    ETHNOPHARMACOLOGICAL RELEVANCE: A traditional Chinese medicine Selaginella doederleinii Hieron has been combined with radiotherapy for the treatment of human nasopharyngeal carcinoma in clinic in China. However, the detailed mechanism of anti-tumor effect of Selaginella doederleinii remains elusive. AIM OF THE STUDY: This study was designed to investigate the anti-tumor effect of ethanol extract of Selaginella doederleinii (SDE) on human nasopharyngeal carcinoma and its possible mechanisms. MATERIALS AND METHODS: Viability, apoptosis and protein expression of tumor cells were analyzed by MTT, Annexin V staining and Western blot, respectively. Formation of intracellular reactive oxygen species was determined using dichlorofluorescin fluorescence. The in vivo anti-tumor effect was evaluated by measuring tumor volume changes and TUNEL staining in nude mice. RESULTS: SDE significantly inhibited the growth and induced apoptosis in human nasopharyngeal carcinoma CNE cells. In addition, SDE triggered the mitochondrial/caspase apoptotic pathway indicated by enhanced Bax-to-Bcl-2 ratio, loss of mitochondrial membrane potential, cytochrome c release, and caspase cascade. Moreover, SDE provoked the generation of reactive oxygen species in CNE cells, while the antioxidant N-acetyl cysteine almost completely blocked SDE-induced disruption of mitochondrial membrane potential, caspases activation and apoptosis. Furthermore, a transplantable nude mice model was utilized to estimate the effectiveness of SDE in vivo. The treated mice displayed decreased tumor size, which was associated with enhanced apoptotic cell death. CONCLUSIONS: These results, offering solid evidence of the induction of mitochondria-related apoptosis in tumor cells, provide the molecular theoretical basis of clinical application of Selaginella doederleinii for the treatment of human nasopharyngeal carcinoma.
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