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Ruan, Dan-Yun; Li, Ting; Wang, Ying-Nan; Meng, Qi; Li, Yang; Yu, Kai; Wang, Min; Lin, Jin-Fei; Luo, Li-Zhi; Wang, De-Shen; Lin, Jun-Zhong; Bai, Long; Liu, Ze-Xian; Zhao, Qi; Wu, Xiang-Yuan; Ju, Huai-Qiang; Xu, Rui-Hua
Oncogene, 08/2021, Letnik: 40, Številka: 33Journal Article
Fat mass and obesity-associated protein (FTO), an N6-methyladenosine (m A) demethylase, participates in tumor progression and metastasis in many malignancies, but its role in colorectal cancer (CRC) is still unclear. Here, we found that FTO protein levels, but not RNA levels, were downregulated in CRC tissues. Reduced FTO protein expression was correlated with a high recurrence rate and poor prognosis in resectable CRC patients. Moreover, we demonstrated that hypoxia restrained FTO protein expression, mainly due to an increase in ubiquitin-mediated protein degradation. The serine/threonine kinase receptor associated protein (STRAP) might served as the E3 ligase and K216 was the major ubiquitination site responsible for hypoxia-induced FTO degradation. FTO inhibited CRC metastasis both in vitro and in vivo. Mechanistically, FTO exerted a tumor suppressive role by inhibiting metastasis-associated protein 1 (MTA1) expression in an m A-dependent manner. Methylated MTA1 transcripts were recognized by an m A "reader", insulin-like growth factor 2 mRNA binding protein 2 (IGF2BP2), which then stabilized its mRNA. Together, our findings highlight the critical role of FTO in CRC metastasis and reveal a novel epigenetic mechanism by which the hypoxic tumor microenvironment promotes CRC metastasis.
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in: SICRIS
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