Abstract
We have previously reported the inhibitory effect of NCX-4016, a nitro derivative of aspirin, on the proliferation of cisplatin-resistant human ovarian cancer cells, in vitro (Bratasz et al., Proc Natl Acad Sci USA 2006; 103:3914-9). In this report we present the results of our study on the mechanistic aspects of drug action including the molecular and signaling pathways involved in an in vitro cell line, as well as in a murine tumor xenograft. We report, for the first time, that NCX-4016 significantly inhibited the growth of cisplatin-resistant human ovarian cancer xenografts in mice. We observed that the inhibitory effect of NCX-4016 on cell proliferation was associated with G(1) phase cell cycle arrest with increased activity of p53, p21 and p27 proteins. NCX-4016 modulated the Bcl-2 family of proteins, and induced apoptosis by activating Bax and cytochrome c release in a time-dependent manner. In addition, NCX-4016 selectively down-regulated the phosphorylated forms of EGFR (Tyr845, Tyr992), pAkt (Ser473, Thr305), and STAT3 (Tyr705, Ser727), in vitro and in vivo. Taken together, the results clearly suggested that NCX-4016 causes significant induction of cell cycle arrest and apoptosis in cisplatin-resistant human ovarian ca...Continue Reading
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