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Int J Biol Sci 2019; 15(2):441-452. doi:10.7150/ijbs.26826

Research Paper

Hypoxia-elevated circELP3 contributes to bladder cancer progression and cisplatin resistance

Yinjie Su1*, Weiping Yang1,2*, Ning Jiang1,4*, Juanyi Shi1, Luping Chen3, Guangzheng Zhong1, Junming Bi1, Wei Dong1, Qiong Wang1, Chunhui Wang2✉, Tianxin Lin1✉

1. The Department of Urology, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, China;
2. The Department of Urology, Yan'an Hospital Affiliated with Kunming Medical University, Kunming, China;
3. The Department of Pediatric Surgery, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, China;
4. The Department of Urology, Zhujiang Hospital of Southern Medical University, Guangzhou, China.
*Authors who contributed equally to this article.

Abstract

Hypoxia plays a critical role in cancer biology. It induces genomic instability, which in turn helps cancer cells respond adaptively to meet the needs of carcinogenesis, cancer progression and relapse. Circular RNA has not been reported among the variety of downstream factors in this adaptive response. Although a few studies have demonstrated the important role of circular RNAs in driving human bladder cancer progression, their carcinogenic roles are still under investigated. Here, we identified a hypoxia-elevated circular RNA, circELP3, that contributes to bladder cancer progression and cisplatin resistance. Decreasing the level of circELP3 via siRNA clearly reduced the in vitro proliferation and cisplatin resistance of bladder cancer cells and promoted apoptosis. Interfering with circELP3 suppressed tumor xenograft growth in nude mice in vivo. In addition, lower circELP3-expressing bladder cancer cells displayed poorer self-renewal capacity, as demonstrated by lower levels of sphere formation and stem cell marker expression. Furthermore, in human bladder cancer patients, strong correlations between a high circELP3 level and advanced tumor grade and lymph node metastasis were observed. In summary, we provide the first direct evidence that circular RNA participates in the adaptive response to hypoxia and may play a role in the progression and drug resistance of bladder cancer.

Keywords: Hypoxia, Circular RNA, Bladder cancer, Progression, Cisplatin resistance

This is an open access article distributed under the terms of the Creative Commons Attribution (CC BY-NC) license (https://creativecommons.org/licenses/by-nc/4.0/). See http://ivyspring.com/terms for full terms and conditions.
How to cite this article:
Su Y, Yang W, Jiang N, Shi J, Chen L, Zhong G, Bi J, Dong W, Wang Q, Wang C, Lin T. Hypoxia-elevated circELP3 contributes to bladder cancer progression and cisplatin resistance. Int J Biol Sci 2019; 15(2):441-452. doi:10.7150/ijbs.26826. Available from http://www.ijbs.com/v15p0441.htm