1. USP8 promotes the tumorigenesis of intrahepatic cholangiocarcinoma via stabilizing OGT
- Author
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Guo Long, Dong Wang, Jianing Tang, Kuan Hu, and Ledu Zhou
- Subjects
USP8 ,Intrahepatic cholangiocarcinoma ,OGT ,Ubiquitination ,Pemigatinib ,Neoplasms. Tumors. Oncology. Including cancer and carcinogens ,RC254-282 ,Cytology ,QH573-671 - Abstract
Abstract Ubiquitination was considered to be a crucial factor in intrahepatic cholangiocarcinoma (iCCA) development. Herein, we identified Ubiquitin-specific peptidase 8 (USP8) as a key regulator for promoting the tumorigenesis of iCCA cell via stabilizing OGT. USP8 was overexpressed in human tumor tissues and correlated with worse survival. Moreover, the mass spectrometry and co-immunoprecipitation analysis indicated that USP8 interacted with OGT. USP8 worked as a bona fide deubiquitylase of OGT. It stabilized OGT in a deubiquitylation activity-dependent manner. Meanwhile, DUB-IN3, the USP8 inhibitor, could also restrain the malignancy of intrahepatic cholangiocarcinoma. In addition, USP8 depletion promoted the response of iCCA to pemigatinib. In conclusion, our findings pointed to a previously undocumented catalytic role for USP8 as a deubiquitinating enzyme of OGT. The USP8-OGT axis could be a potential target for iCCA therapy.
- Published
- 2024
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