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Among four tested extracts, obtained with different solvents, MRE showed the highest content of polyphenols, flavonoids, and tannins together with antioxidant activities tested with superoxide, nitric oxide, ABTS, and beta-carotene bleaching assays. Moreover, the cytotoxic effect of MRE was evaluated on the hepatocarcinoma cell line HepG2. In these cells, MRE treatment induced apoptosis and generated reactive oxygen species (ROS) in dose-dependent manner. The cytotoxic effect promoted by MRE was prevented by pretreatment of HepG2 cells with N-acetyl-L-cysteine (NAC), suggesting that oxidative stress was pivotal in MRE-mediated cell death. Moreover, we showed that the MRE treatment induced the mitochondrial membrane depolarization and the cytochrome<jats:italic>c<\/jats:italic>release from mitochondria into the cytosol. It suggests that the apoptosis occurred in a mitochondrial-dependent pathway. Interestingly, MRE showed a sensibly lower cytotoxicity, associated with a low increase of ROS, in normal human dermal fibroblasts compared to HepG2 cells. It is suggested that the methanolic root extract of<jats:italic>S. Birrea<\/jats:italic>is able to selectively increase intracellular ROS levels in cancer cells, promoting cell death.<\/jats:p>","DOI":"10.1155\/2015\/561589","type":"journal-article","created":{"date-parts":[[2015,5,18]],"date-time":"2015-05-18T02:50:33Z","timestamp":1431917433000},"page":"1-11","source":"Crossref","is-referenced-by-count":37,"title":["Antioxidant and Proapoptotic Activities of<i>Sclerocarya birrea<\/i>[(A. Rich.) 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