NDLI: Blocking of JB6 Cell Transformation by Tanshinone IIA: Epigenetic Reactivation of Nrf2 Antioxidative Stress Pathway

Content Provider	Springer Nature Link
Author	Wang, Ling Zhang, Chengyue Guo, Yue Su, Zheng Yuan Yang, Yuqing Shu, Limin Kong, Ah Ng Tony
Copyright Year	2014
Abstract	Increasing numbers of natural products have been found to possess anticancer effects. Nuclear factor erythroid-2-related factor-2 (Nrf2) is a master regulator of the antioxidative stress response, and our previous studies found that epigenetic modification of the Nrf2 gene appears to be a critical mechanism. Salvia miltiorrhiza, a Chinese herbal medicine widely used in Asian countries, has been shown to possess anticancer and antioxidant effects. Tanshinone IIA (TIIA), an active component in S. miltiorrhiza, has been reported to activate Nrf2 pathway. The objective of this study was to investigate the epigenetic regulation of Nrf2 by TIIA in mouse skin epidermal JB6 cells and the functional consequences for cell transformation. TIIA was found to induce antioxidant response element-luciferase and upregulate the mRNA and protein levels of Nrf2 and Nrf2 downstream target genes HO-1 and NQO-1. TIIA decreased the colony formation of JB6 cells by approximately 80%. TIIA decreased the protein levels of DNMT1, DNMT3a, DNMT3b, and HDAC3 and inhibited the enzymatic activity of HDACs. Bisulfite genomic sequencing indicated that TIIA demethylated the first five CpGs in the promoter region of the Nrf2 gene. Chromatin immunoprecipitation assays showed that TIIA treatment increased the recruitment of RNA polymerase II at Nrf2 transcription start site but had limited effects on enrichment of Ac-H3 in Nrf2 promoter. Taken together, our results show that TIIA activates the Nrf2 signaling pathway and induces epigenetic demethylation of the CpGs of Nrf2. The epigenetic reactivation of the Nrf2 signaling pathway by TIIA could potentially contribute to the attenuation of JB6 cellular transformation and anticancer effects.
Starting Page	1214
Ending Page	1225
Page Count	12
File Format	PDF
ISSN	12341234
Journal	The AAPS Journal
Volume Number	16
Issue Number	6
e-ISSN	15507416
Language	English
Publisher	Springer US
Publisher Date	2014-10-02
Publisher Institution	American Association of Pharmaceutical Scientists
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Pharmacology/Toxicology Biochemistry Biotechnology Pharmacy
Content Type	Text
Resource Type	Article

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