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Anti-angiogenic Effect of Cryptotanshinone through Inhibition of HIF-1alpha and STAT3 in Prostate Cancer Cells  

Lee, Hyo-Jeong (Korean Medicine, Kyunghee University)
Hong, Sang-Hyuk (Korean Medicine, Kyunghee University)
Kim, Sung-Hoon (Korean Medicine, Kyunghee University)
Publication Information
Journal of Physiology & Pathology in Korean Medicine / v.26, no.4, 2012 , pp. 437-440 More about this Journal
Abstract
Signal transducer and activator of transcription 3 (STAT3) is a transcription factor that regulates various cellular processes such as cell survival, angiogenesis and proliferation. In the present study, we examined that Cryptotanshione(CT), a tanshinone from oriental traditional medicinal herb Danshen (Salvia miltiorrhiza Bunge), had the inhibitory effects on hypoxia-mediated activation of STAT3 in androgen independent human prostate cancer PC-3 cells. CT inhibited the protein expression of hypoxia-inducible factor-1alpha (HIF-$1{\alpha}$) under hypoxic condition. Consistently, CT blocked hypoxia-induced phosphorylation and nuclear accumulation of STAT3. In addition, CT reduced cellular of vascular endothelial growth factor (VEGF), a critical angiogenic factor and a target gene of STAT3 induced under hypoxia. Of note, chromatin immunoprecipitation (ChiP) assay revealed that CT inhibited binding of STAT3 to VEGF promoter. Taken together, our results suggest that CT has anti-angiogenic activity by disturbing the binding STAT3 to the VEGF promoter in PC-3 cells.
Keywords
Danshen; Salvia miltiorrhiza Bunge; Cryptotanshinone; HIF-$1{\alpha}$; STAT-3;
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