Deubiquitinase USP10 Promotes Osteosarcoma Autophagy and Progression Through Regulating GSK3β-ULK1 Axis

Overview

Journal Cell Biosci

Publisher Biomed Central

Specialty Biology

Date 2024 Sep 1

PMID 39218913

Authors

Zuxi Feng

Yanghuan Ou

Xueqiang Deng

Minghao Deng

Xiaohua Yan

Leifeng Chen

Fan Zhou

Liang Hao

Affiliations

Soon will be listed here.

Abstract

Background: Deubiquitinating enzymes (DUBs) are pivotal in maintaining cell homeostasis by regulating substrate protein ubiquitination in both healthy and cancer cells. Ubiquitin-specific protease 10 (USP10) belongs to the DUB family. In this study, we investigated the clinical and pathological significance of USP10 and Unc-51-like autophagy activating kinase 1 (ULK1) in osteosarcoma (OS), as well as the mechanism of USP10 action in ULK1-mediated autophagy and disease progression.

Results: The analysis of OS and adjacent normal tissues demonstrated that USP10 and ULK1 were significantly overexpressed in OS, and a positive association between their expression and malignant properties was observed. USP10 knockdown in OS cells reduced ULK1 mRNA and protein expression, whereas USP10 overexpression increased ULK1 mRNA and protein expression. In vitro experiments showed that USP10 induced autophagy, cell proliferation, and invasion by enhancing ULK1 expression in OS cell lines. Furthermore, we found that the regulation of ULK1-mediated autophagy, cell proliferation, and invasion in OS by USP10 was dependent on glycogen synthase kinase 3β (GSK3β) activity. Mechanistically, USP10 promoted ULK1 transcription by interacting with and stabilising GSK3β through deubiquitination, which, in turn, increased the activity of the ULK1 promoter, thereby accelerating OS progression. Using a xenograft mouse model, we showed that Spautin-1, a small-molecule inhibitor targeting USP10, significantly reduced OS development, with its anti-tumour activity significantly enhanced when combined with the chemotherapeutic agent cisplatin.

Conclusion: Collectively, we demonstrated that the USP10-GSK3β-ULK1 axis promoted autophagy, cell proliferation, and invasion in OS. The findings imply that targeting USP10 may offer a promising therapeutic avenue for treating OS.

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