TET1 inhibits cell proliferation by inducing RASSF5 expression
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Bo-Tai Li2, Chao Yu2, Ying Xu1, Sheng-Bing Liu1, Heng-Yu Fan2 and Wei-Wei Pan1
1Department of Cell Biology, College of Medicine, Jiaxing University, Jiaxing 314001, China
2Life Sciences Institute, Zhejiang University, Hangzhou 301158, China
Wei-Wei Pan, email: [email protected]
Heng-Yu Fan, email: [email protected]
Keywords: ovarian cancer, TET1, RASSF5, proliferation, DNA methylation
Received: May 07, 2017 Accepted: August 23, 2017 Published: September 23, 2017
Tet methylcytosine dioxygenases (TETs) catalyze the oxidative reactions of 5-methylcytosine to 5-hydroxymethylcytosine (5hmC). However, TET1 roles in ovarian cancer cell growth are unknown. Here, we show that ectopic expression of TET1 increased 5hmC levels, and inhibited proliferation and colony formation in ovarian cancer cell lines. Furthermore, in vitro and in vivo functional studies demonstrated that TET1 overexpression is necessary for the suppression of ovarian cancer growth, whereas depletion of TET1 expression had the opposite effect. Furthermore, the results of RNA-seq and qRT-PCR analyses identified a tumor suppressor, Ras association domain family member 5 (RASSF5), as the key downstream target of TET1. TET1 promotes RASSF5 expression by demethylating a CpG site within RASSF5 promoter. Up-regulated RASSF5 expression leads to the suppression of ovarian cancer cells growth. Additionally, we demonstrated that inhibition of CUL4-DDB1 ubiquitin ligase complex decrease 5hmC levels in ovarian cancer cells. These results provide new insights into the understanding of how ovarian cancers develop and grow, and identify TET1 as a key player in this process.
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