Abstract
Berberine (BBR) is an isoquinoline alkaloid and is beneficial for the anticancer effect on a variety of human tumor cells. However, BBR's anti-angiogenesis property and its clinical potential as an inhibitor of tumor angiogenesis in breast cancer cells have not been fully elucidated. Here, we investigated the effect of BBR on TPA-induced VEGF and fibronectin (FN) as well as VEGF-induced FN in breast cancer cells. The secretion of VEGF protein was detected by ELISA. Fibronectin mRNA and protein expression was analyzed by Real-Time PCR and western blotting, respectively. The overexpressions of CA-MEK, and CA-Akt were examined by adenovirus system. Our results showed that TPA, a tumor promoter, significantly increased the level of VEGF and FN expression in both MCF7 and T47D breast cancer cells. On the other hand, TPA-induced VEGF and FN expression was suppressed by LY294002, a PI-3K inhibitor. In contrast, the level of FN expression also significantly increased by constitutively active (CA)-AKT overexpression. We also found that TPA-induced VEGF and FN expression was decreased by BBR treatment. Finally, our results showed that VEGF augmented the expression of FN whereas VEGF-induced FN expression was decreased by BBR treatment. T...Continue Reading
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