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YAP-dependent induction of UHMK1 supports nuclear enrichment of the oncogene MYBL2 and proliferation in liver cancer cells

Abstract

The oncogene yes-associated protein (YAP) is a key modifier of liver homeostasis and regulates mitosis in hepatocytes as well as in malignantly transformed cells. However, the question of how YAP supports cell proliferation in hepatocellular carcinoma (HCC) is not well understood. Here we identified U2AF momology motif kinase 1 (UHMK1) as a direct transcriptional target of YAP and the transcription factor forkhead box M1 (FOXM1), which supports HCC cell proliferation but not migration. Indeed, UHMK1 stimulates the expression of genes that are specific for cell cycle regulation and which are known downstream effectors of YAP. By using BioID labeling and mass spectrometry, the dimerization partner, RB-like, E2F and multi-vulval class B (DREAM) complex constituent MYB proto-oncogene like 2 (MYBL2, B-MYB) was identified as a direct UHMK1 interaction partner. Like YAP, UHMK1 stimulates nuclear enrichment of MYBL2, which is associated HCC cell proliferation and the expression of the cell cycle regulators CCNB1, CCNB2, KIF20A, and MAD2L1. The association between YAP, UHMK1, MYBL2, and proliferation was confirmed in YAPS127A-transgenic mice and human HCC tissues. In summary, we provide a model by which YAP supports cell proliferation through the induction of important cell cycle regulators in a UHMK1- and MYBL2-dependent manner.

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Acknowledgements

We thank M. Bissinger and J. Schmitt for excellent technical assistance, Dr. A. Ori for providing us with the BirA vector, as well as T. R. Brummelkamp and F. D. Camargo for providing Col1A1-YAPS127A transgenic mice. Tissue samples were provided by the tissue bank of the National Center of Tumor Diseases (Heidelberg, Germany) in accordance with the regulations of the tissue bank and the approval of the Ethics Committee of Heidelberg University. We also thank the Center of Model System and Comparative Pathology (CMCP; Dr. F. Lasitschka, Dr. T. Poth) and H. Conrad for their support. This study was supported by a grant from the German Cancer Aid (Deutsche Krebshilfe/Dr. Mildred Scheel Stiftung, to K.B., DKH 111524), the SFB/TR 209 “Liver Cancer” (to K.B., S.S., and P.S.), the priority program SPP1782/2 (to K.B.), and the China Scholarship Council/CSC (to T.W.). J.U.M. is supported by grants from the German Research Foundation (MA 4443/2-2) and the Volkswagen Foundation (Lichtenberg program).

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Wei, T., Weiler, S.M.E., Tóth, M. et al. YAP-dependent induction of UHMK1 supports nuclear enrichment of the oncogene MYBL2 and proliferation in liver cancer cells. Oncogene 38, 5541–5550 (2019). https://doi.org/10.1038/s41388-019-0801-y

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