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Sun C, Han B, Zhai Y, Zhao H, Li X, Qian J, Hao X, Liu Q, Shen J, Kai G. Dihydrotanshinone I inhibits ovarian tumor growth by activating oxidative stress through Keap1-mediated Nrf2 ubiquitination degradation. Free Radic Biol Med 2022; 180:220-235. [PMID: 35074488 DOI: 10.1016/j.freeradbiomed.2022.01.015] [Citation(s) in RCA: 25] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/20/2021] [Revised: 01/12/2022] [Accepted: 01/18/2022] [Indexed: 12/20/2022]
Abstract
Dihydrotanshinone I (DHT), a bioactive compound in Salvia miltiorrhiza, was reported to exhibit cytotoxicity against various malignancies. However, the underlying mechanism on ovarian cancer remains unclear. Here, DHT inhibited cell viability of ovarian cancer HO8910PM, SKOV3, A2780 and ES2 cells. It showed moderate inhibitory effect on ovarian epithelial IOSE80 cells and lower toxicity than chemotherapy drugs. DHT induced apoptosis and G2 cell cycle arrest accompanied by reduced expression of Bcl-2, Caspase-3, and increased Bax. Meanwhile, DHT increased ROS accumulation, decreased mitochondrial membrane potential and activated oxidative stress in HO8910PM and ES2 cells. Mechanistically, DHT inhibited Nrf2 and p62 expression, Nrf2 target genes and enzymes, and Nrf2 nuclear translocation, while increased the expression of Nrf2 inhibitor Keap1. NAC, a ROS scavenger, rescued DHT-induced proliferation inhibition, ROS generation and Nrf2 inhibition. DHT alleviated tBHQ-induced Nrf2 expression and increased its mRNA level. However, the proteasome inhibitor MG132 blocked DHT-induced Nrf2 inhibition, suggesting a post-translational regulation manner. DHT enhanced Nrf2 binding with Keap1, leading to potentiated Nrf2 ubiquitination degradation. Furthermore, Nrf2 and p62 overexpression blocked DHT-induced Nrf2 and p62 inhibition. Consistent with the in vitro results, DHT significantly delayed tumor growth in HO8910PM and ES2 xenograft nude mice, decreased tumor marker HE4 and CA125 levels, reversed the abnormally expressed proteins including Ki67, Nrf2, p62, Keap1, Bcl-2, CyclinB1, Cdc-2, and antioxidant enzymes SOD, CAT in vivo. Serum from DHT-treated mice also inhibited cell growth in vitro. Taken together, DHT exhibits anti-ovarian tumor effect by activating oxidative stress through ubiquitination-mediated Nrf2 degradation. Our findings implicate a potential application of DHT for ovarian cancer therapy.
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Affiliation(s)
- Chengtao Sun
- Laboratory for Core Technology of TCM Quality Improvement and Transformation, College of Pharmaceutical Science, The Third Affiliated Hospital, Academy of Chinese Medical Science, Zhejiang Chinese Medical University, Hangzhou, 310053, China
| | - Bing Han
- Laboratory for Core Technology of TCM Quality Improvement and Transformation, College of Pharmaceutical Science, The Third Affiliated Hospital, Academy of Chinese Medical Science, Zhejiang Chinese Medical University, Hangzhou, 310053, China
| | - Yufei Zhai
- Laboratory for Core Technology of TCM Quality Improvement and Transformation, College of Pharmaceutical Science, The Third Affiliated Hospital, Academy of Chinese Medical Science, Zhejiang Chinese Medical University, Hangzhou, 310053, China
| | - Huan Zhao
- Laboratory for Core Technology of TCM Quality Improvement and Transformation, College of Pharmaceutical Science, The Third Affiliated Hospital, Academy of Chinese Medical Science, Zhejiang Chinese Medical University, Hangzhou, 310053, China
| | - Xuan Li
- Laboratory for Core Technology of TCM Quality Improvement and Transformation, College of Pharmaceutical Science, The Third Affiliated Hospital, Academy of Chinese Medical Science, Zhejiang Chinese Medical University, Hangzhou, 310053, China
| | - Jun Qian
- Laboratory for Core Technology of TCM Quality Improvement and Transformation, College of Pharmaceutical Science, The Third Affiliated Hospital, Academy of Chinese Medical Science, Zhejiang Chinese Medical University, Hangzhou, 310053, China
| | - Xiaolong Hao
- Laboratory for Core Technology of TCM Quality Improvement and Transformation, College of Pharmaceutical Science, The Third Affiliated Hospital, Academy of Chinese Medical Science, Zhejiang Chinese Medical University, Hangzhou, 310053, China
| | - Qun Liu
- Institute of Botany, Jiangsu Province and Chinese Academy of Sciences (Nanjing Botanical Garden Mem. Sun Yat-Sen), Nanjing, 210014, China
| | - Jiayan Shen
- Laboratory for Core Technology of TCM Quality Improvement and Transformation, College of Pharmaceutical Science, The Third Affiliated Hospital, Academy of Chinese Medical Science, Zhejiang Chinese Medical University, Hangzhou, 310053, China
| | - Guoyin Kai
- Laboratory for Core Technology of TCM Quality Improvement and Transformation, College of Pharmaceutical Science, The Third Affiliated Hospital, Academy of Chinese Medical Science, Zhejiang Chinese Medical University, Hangzhou, 310053, China.
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Mackay HJ, Kohn EC. Intraperitoneal chemotherapy: Hot, timely, and relevant? Cancer 2020; 126:5206-5209. [PMID: 32931026 DOI: 10.1002/cncr.33163] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2020] [Accepted: 07/17/2020] [Indexed: 11/10/2022]
Affiliation(s)
- Helen J Mackay
- Division of Medical Oncology and Hematology, Odette Cancer Centre, Sunnybrook Health Sciences Centre, Toronto, Ontario, Canada
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