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• W2500850101 abstract "Si-Wu-Tang (SWT), comprising the combination of four herbs, Rehmanniae, Angelica, Chuanxiong and Paeoniae, is one of the most popular Chinese medicines for women's diseases. Previously we showed that SWT was able to upregulate genes in the nuclear factor erythroid 2-related factor 2 (Nrf2) pathway, suggesting a potential application for cancer chemoprevention. The present study examined the chemopreventive activity of SWT using models of skin carcinogenesis. In JB6 P+ cells, a non-cancerous murine epidermal cell line for studying skin tumor promotion, SWT inhibited epidermal growth factor (EGF)-induced neoplastic transformation. In a 7,12-dimethylbenz(a)anthracene (DMBA)-induced murine skin tumorigenesis model, both topical and oral treatment of SWT inhibited epidermal hyperplasia, proliferating cell nuclear antigen expression, and H-ras mutations induced by DMBA treatment. In addition, SWT exhibited a significant antimutagenic activity against DMBA-induced mutagenicity, determined by the Ames Test using Salmonella typhimurium TA100 in the presence of metabolic activator S9 system. To identify active components in SWT, among nine compounds previously reported in commercial SWT products, in silico molecular docking analysis predicted some as potential Nrf2 activators due to an ability of interfering the forming of Nrf2-Keap1 complex. Three of these compounds, gallic acid, Z-liguistilide and senkyunolide A, were confirmed with highest potency of increasing the antioxidant response element luciferase reporter activity, inducing Nrf2-regulated genes Hmox1, Slc7A11 and Nqo1, and inhibiting EGF-induced JB6 P+ transformation. Further mechanistic studies showed that SWT and the three compounds suppressed EGF-induced activation of the activator protein 1 (AP-1), an essential transcription factor involved in skin carcinogenesis. The antimutagenic activity for the three compounds was also confirmed with the Ames Test. In conclusion, these results provide evidence that SWT and its constituents are able to prevent skin cancer, at least partly, by activating the Nrf2 pathway and blocking the activation of AP-1. Thus, this widely used Chinese medicinal formula may provide a promising option toward preventing skin cancer or may be other types of cancer.Citation Format: Kevin Huang, Mandy Liu, Suhui Zhang, Steven Yeung, Andy Chang, Li Qian, Payal Chatterjee, Rui Li, Su Zhou, Nan Mei, Zhijun Wang, Cyrus Parsa, Robert Orlando, Yun Luo, Ying Huang. Skin cancer prevention by traditional Chinese medicinal formula Si-Wu-Tang and its constituents. [abstract]. In: Proceedings of the 107th Annual Meeting of the American Association for Cancer Research; 2016 Apr 16-20; New Orleans, LA. Philadelphia (PA): AACR; Cancer Res 2016;76(14 Suppl):Abstract nr 5252." @default.
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• W2500850101 date "2016-07-15" @default.
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• W2500850101 title "Abstract 5252: Skin cancer prevention by traditional Chinese medicinal formula Si-Wu-Tang and its constituents" @default.
• W2500850101 doi "https://doi.org/10.1158/1538-7445.am2016-5252" @default.
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