Shi Y,Yang S,Troup S,Lu X,Callaghan S,Park DS,Xing Y,Yang X. Resveratrol induces apoptosis in breast cancer cells by E2F1-mediated up-regulation of ASPP1.Oncology Reports.2011 Jun;25(6):1713-9. doi: 10.3892/or.2011.1248. Epub 2011 Apr 6.
Resveratrol is a natural polyphenolic compound with cancer chemopreventive activity. However, our understanding of the molecular mechanism responsible for resveratrol-induced apoptosis is still very limited. Here, we used MCF-7 and MDA-MB231 breast cancer cells as a model to demonstrate that resveratrol induced the expression of ASPP1, a new member of the ASPP (apoptosis stimulation protein of p53) family, which plays an important role in the regulation of apoptosis. Moreover, resveratrol enhanced apoptosis of MCF-7/ASPP1 cells, accompanied by higher expression of bax and p21. In contrast, siRNA-mediated knockdown of ASPP1 inhibited apoptosis in MB231 cells. Furthermore, we found that higher levels of ASPP1 were associated with adenovirus-mediated overexpression of E2F1 while siRNA-mediated E2F1 knockdown led to down-regulation of ASPP1. In conclusion, our results demonstrate that overexpression of ASPP1 rendered MCF-7 and MDA-MB231 breast cancer cells more sensitive to resveratrol-mediated apoptosis via the E2F pathway, thus suggesting that ASPP1 may represent a novel therapeutic target for resveratrol in human breast cancer.