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- Title
DNA polymerase POLD1 promotes proliferation and metastasis of bladder cancer by stabilizing MYC.
- Authors
Wang, Yejinpeng; Ju, Lingao; Wang, Gang; Qian, Kaiyu; Jin, Wan; Li, Mingxing; Yu, Jingtian; Shi, Yiliang; Wang, Yongzhi; Zhang, Yi; Xiao, Yu; Wang, Xinghuan
- Abstract
To date, most studies on the DNA polymerase, POLD1, have focused on the effect of POLD1 inactivation mutations in tumors. However, the implications of high POLD1 expression in tumorigenesis remains elusive. Here, we determine that POLD1 has a pro-carcinogenic role in bladder cancer (BLCA) and is associated to the malignancy and prognosis of BLCA. Our studies demonstrate that POLD1 promotes the proliferation and metastasis of BLCA via MYC. Mechanistically, POLD1 stabilizes MYC in a manner independent of its' DNA polymerase activity. Instead, POLD1 attenuates FBXW7-mediated ubiquitination degradation of MYC by directly binding to the MYC homology box 1 domain competitively with FBXW7. Moreover, we find that POLD1 forms a complex with MYC to promote the transcriptional activity of MYC. In turn, MYC increases expression of POLD1, forming a POLD1-MYC positive feedback loop to enhance the pro-carcinogenic effect of POLD1-MYC on BLCA. Overall, our study identifies POLD1 as a promotor of BCLA via a MYC driven mechanism and suggest its potential as biomarker for BLCA. DNA polymerase 1 (POLD1) has an important role in DNA damage repair and is frequently upregulated in cancer. Here, the authors report a non-canonical role of POLD1 wherein it stabilises MYC protein, creating a positive feedback loop with POLD1 expression and driving bladder cancer progression and metastasis.
- Subjects
BLADDER cancer; METASTASIS; MYC proteins; CANCER invasiveness; DNA repair; MOLECULAR motor proteins
- Publication
Nature Communications, 2023, Vol 14, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-023-38160-x