Journal
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
Volume 368, Issue 1, Pages 1-5Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.bbrc.2007.04.004
Keywords
leptin; survivin; signal transducer and activator transcription 3; MCF-7; apoptosis
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Leptin and its receptors are overexpressed in breast cancer tissues and correlate with poor prognosis. Survivin, a member of the inhibitor of apoptosis protein (IAP) gene family, is generally upregulated in tumor tissues and prevents tumor cells from apoptosis. Here we showed that leptin upregulated survivin mRNA and protein expression in MCF-7 breast cancer cells. Meanwhile, leptin suppressed docetaxel-induced apoptosis by inhibiting caspase activity. Knockdown of signal transducer and activator transcription 3 (STAT3) expression by small interfering RNA (siRNA) blocked leptin-induced upregulation of survivin. TransAM ELISA showed that leptin increased nuclear translocation of active STAT3. In addition, chromatin immunoprecipitation (ChIP) assay detected an enhanced binding of STAT3 to survivin promoter in MCF-7 cells after treatment by leptin. Further studies showed that leptin enhanced the transcriptional activity of survivin promoter. Collectively, our findings identify leptin/STAT3 signaling as a novel pathway for survivin expression in breast cancer cells. (C) 2007 Elsevier Inc. All rights reserved.
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