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Withaferin a Enhances Radiation-Induced Apoptosis in Caki Cells Through Induction of Reactive Oxygen Species, Bcl-2 Downregulation and Akt Inhibition
Posted by Admin, Senior Editor in Ashwagandha
Authored by PubMed
Topics: Ashwagandha Withania Somnifera

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Yang ES, Choi MJ, Kim JH, Choi KS, Kwon TK. Withaferin A enhances radiation-induced apoptosis in Caki cells through induction of reactive oxygen species, Bcl-2 downregulation and Akt inhibition. 1. Chem Biol Interact. 2011 Mar 15;190(1):9-15. Epub 2011 Jan 21.
Withaferin A (Wit A), a natural compound derived from the medicinal plant Withania somnifera, has been reported for the anti-tumor effects, including the inhibition of tumor cell growth, metastasis and angiogenesis. In this study, we investigated the effect of Wit A on radiation-induced apoptosis in human renal cancer cells (Caki cells). Our results showed that, compared with Wit A or radiation alone, the combination of both resulted in a significant enhancement of apoptosis, showing the increase in the cleavage of caspase-3 and PARP as well as sub-G1 cell population. In addition, reactive oxygen species (ROS) generation was correlated with the enhancement of radiation-induced apoptosis by Wit A. Wit A downregulated Bcl-2 protein levels and ectopic expression of Bcl-2 in Caki cells attenuated the apoptosis induced by Wit A plus radiation. Taken together, these results indicate that Wit A enhanced radiation-induced apoptosis in Caki cells through ROS generation, down-regulation of Bcl-2 and Akt dephosphorylation. Thus, our study shows that Wit A may be used as an effective radiosensitizer in cancer therapy.


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