Abstract
Cholangiocarcinoma (CCA) is a highly heterogeneous group of malignant tumors with different molecular etiologies and clinical manifestations. Post-translational modifications (PTM) such as ubiquitination and phosphorylation are widely involved in the progression of CCA. Our aim was to elucidate the effect of the deubiquitinating enzyme OTU domain-containing protein 3 (OTUD3) on the molecular pathogenesis of CAA. OTUD3 and ARID3A exhibit direct binding interactions and cytosolic substructural co-localization in CCA cells.OTUD3 specifically removes the ARID3A proteins K240 and K329 OTUD3 specifically removes the ubiquitinated chains at K240 and K329 of ARID3A protein, thereby enhancing ARID3A stability. OTUD3 promotes CCA proliferation and metastasis in vivo and in vitro by interacting with ARID3A.GSK3β interacts with OTUD3 protein and mediates phosphorylation of the Ser9 site of OTUD3, which enhances the affinity of OTUD3 to ARID3A and further stabilizes ARID3A protein. The expression of OTUD3 and ARID3A in CCA tissues is highly correlated, and the high expression of both proteins is closely related to the poor prognosis of patients. In conclusion, GSK3β phosphorylates OTUD3, enhances its binding ability to ARID3A, and ultimately inhibits the ubiquitination degradation of ARID3A, which promotes the progression of CCA. The GSK3β-OTUD3-ARID3A signaling pathway has been demonstrated for the first time in the progression of CCA.
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All data relevant to the study are included in the paper or uploaded as supplementary materials. The data and sources associated with this study are available from the corresponding author upon request.
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Acknowledgements
This study was supported by Anhui province health scientific research project (AHWJ2023b015), Anhui Provincial Natural Science Foundation (202308085MH271), Anhui University Natural Science Research Project (2024AH051282), the sixth batch of “special support plan” leading talent projects in Anhui Province.
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Deng-Yong Zhang, Wei-ying Zhao, Xiao-Lun Huang, and Zheng Lu conceived of and designed the study. Shuoshuo Ma, Yan Zhu, Deng-Yong Zhang, and Chen-yang Xu performed the main experiments, analyzed the data, and drafted the manuscript. Deng-Yong Zhang, Zhonglin Wang, Fangfang Chen, and Hui Wang helped with data analysis. Deng-Yong Zhang, Jin Shang, and Sihua Liu collected samples. Prit Benny Malgulwar assisted with drafting the manuscript. All authors read and agreed to the published version of the paper.
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This animal study was approved by the Animal Ethics Committee of Bengbu Medical College (No. 2021298). This study was approved by the Bengbu Medical College Ethics Committee (No. 2021230). All methods were performed in accordance with the relevant guidelines and regulations. The informed consent was obtained from all participants.
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Zhang, DY., Zhu, Y., Ma, SS. et al. Phosphorylation enhanced OTUD3 deubiquitination ARID3A promotes the progress of cholangiocarcinoma. Oncogene 44, 2040–2053 (2025). https://doi.org/10.1038/s41388-025-03376-2
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DOI: https://doi.org/10.1038/s41388-025-03376-2