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Elevated FBXO45 promotes liver tumorigenesis through enhancing IGF2BP1 ubiquitination and subsequent PLK1 upregulation

Dysregulation of tumor-relevant proteins may contribute to human hepatocellular carcinoma (HCC) tumorigenesis. FBXO45 is an E3 ubiquitin ligase that is frequently elevated expression in human HCC. However, it remains unknown whether FBXO45 is associated with hepatocarcinogenesis and how to treat HCC...

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Autores principales: Lin, Xiao-Tong, Yu, Hong-Qiang, Fang, Lei, Tan, Ye, Liu, Ze-Yu, Wu, Di, Zhang, Jie, Xiong, Hao-Jun, Xie, Chuan-Ming
Formato: Online Artículo Texto
Lenguaje:English
Publicado: eLife Sciences Publications, Ltd 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8641947/
https://www.ncbi.nlm.nih.gov/pubmed/34779401
http://dx.doi.org/10.7554/eLife.70715
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author Lin, Xiao-Tong
Yu, Hong-Qiang
Fang, Lei
Tan, Ye
Liu, Ze-Yu
Wu, Di
Zhang, Jie
Xiong, Hao-Jun
Xie, Chuan-Ming
author_facet Lin, Xiao-Tong
Yu, Hong-Qiang
Fang, Lei
Tan, Ye
Liu, Ze-Yu
Wu, Di
Zhang, Jie
Xiong, Hao-Jun
Xie, Chuan-Ming
author_sort Lin, Xiao-Tong
collection PubMed
description Dysregulation of tumor-relevant proteins may contribute to human hepatocellular carcinoma (HCC) tumorigenesis. FBXO45 is an E3 ubiquitin ligase that is frequently elevated expression in human HCC. However, it remains unknown whether FBXO45 is associated with hepatocarcinogenesis and how to treat HCC patients with high FBXO45 expression. Here, IHC and qPCR analysis revealed that FBXO45 protein and mRNA were highly expressed in 54.3% (57 of 105) and 52.2% (132 of 253) of the HCC tissue samples, respectively. Highly expressed FBXO45 promoted liver tumorigenesis in transgenic mice. Mechanistically, FBXO45 promoted IGF2BP1 ubiquitination at the Lys190 and Lys450 sites and subsequent activation, leading to the upregulation of PLK1 expression and the induction of cell proliferation and liver tumorigenesis in vitro and in vivo. PLK1 inhibition or IGF2BP1 knockdown significantly blocked FBXO45-driven liver tumorigenesis in FBXO45 transgenic mice, primary cells, and HCCs. Furthermore, IHC analysis on HCC tissue samples revealed a positive association between the hyperexpression of FBXO45 and PLK1/IGF2BP1, and both had positive relationship with poor survival in HCC patients. Thus, FBXO45 plays an important role in promoting liver tumorigenesis through IGF2BP1 ubiquitination and activation, and subsequent PLK1 upregulation, suggesting a new strategy for treating HCC by targeting FBXO45/IGF2BP1/PLK1 axis.
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spelling pubmed-86419472021-12-06 Elevated FBXO45 promotes liver tumorigenesis through enhancing IGF2BP1 ubiquitination and subsequent PLK1 upregulation Lin, Xiao-Tong Yu, Hong-Qiang Fang, Lei Tan, Ye Liu, Ze-Yu Wu, Di Zhang, Jie Xiong, Hao-Jun Xie, Chuan-Ming eLife Biochemistry and Chemical Biology Dysregulation of tumor-relevant proteins may contribute to human hepatocellular carcinoma (HCC) tumorigenesis. FBXO45 is an E3 ubiquitin ligase that is frequently elevated expression in human HCC. However, it remains unknown whether FBXO45 is associated with hepatocarcinogenesis and how to treat HCC patients with high FBXO45 expression. Here, IHC and qPCR analysis revealed that FBXO45 protein and mRNA were highly expressed in 54.3% (57 of 105) and 52.2% (132 of 253) of the HCC tissue samples, respectively. Highly expressed FBXO45 promoted liver tumorigenesis in transgenic mice. Mechanistically, FBXO45 promoted IGF2BP1 ubiquitination at the Lys190 and Lys450 sites and subsequent activation, leading to the upregulation of PLK1 expression and the induction of cell proliferation and liver tumorigenesis in vitro and in vivo. PLK1 inhibition or IGF2BP1 knockdown significantly blocked FBXO45-driven liver tumorigenesis in FBXO45 transgenic mice, primary cells, and HCCs. Furthermore, IHC analysis on HCC tissue samples revealed a positive association between the hyperexpression of FBXO45 and PLK1/IGF2BP1, and both had positive relationship with poor survival in HCC patients. Thus, FBXO45 plays an important role in promoting liver tumorigenesis through IGF2BP1 ubiquitination and activation, and subsequent PLK1 upregulation, suggesting a new strategy for treating HCC by targeting FBXO45/IGF2BP1/PLK1 axis. eLife Sciences Publications, Ltd 2021-11-15 /pmc/articles/PMC8641947/ /pubmed/34779401 http://dx.doi.org/10.7554/eLife.70715 Text en © 2021, Lin et al https://creativecommons.org/licenses/by/4.0/This article is distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use and redistribution provided that the original author and source are credited.
spellingShingle Biochemistry and Chemical Biology
Lin, Xiao-Tong
Yu, Hong-Qiang
Fang, Lei
Tan, Ye
Liu, Ze-Yu
Wu, Di
Zhang, Jie
Xiong, Hao-Jun
Xie, Chuan-Ming
Elevated FBXO45 promotes liver tumorigenesis through enhancing IGF2BP1 ubiquitination and subsequent PLK1 upregulation
title Elevated FBXO45 promotes liver tumorigenesis through enhancing IGF2BP1 ubiquitination and subsequent PLK1 upregulation
title_full Elevated FBXO45 promotes liver tumorigenesis through enhancing IGF2BP1 ubiquitination and subsequent PLK1 upregulation
title_fullStr Elevated FBXO45 promotes liver tumorigenesis through enhancing IGF2BP1 ubiquitination and subsequent PLK1 upregulation
title_full_unstemmed Elevated FBXO45 promotes liver tumorigenesis through enhancing IGF2BP1 ubiquitination and subsequent PLK1 upregulation
title_short Elevated FBXO45 promotes liver tumorigenesis through enhancing IGF2BP1 ubiquitination and subsequent PLK1 upregulation
title_sort elevated fbxo45 promotes liver tumorigenesis through enhancing igf2bp1 ubiquitination and subsequent plk1 upregulation
topic Biochemistry and Chemical Biology
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8641947/
https://www.ncbi.nlm.nih.gov/pubmed/34779401
http://dx.doi.org/10.7554/eLife.70715
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