NDLI: USP22 Acts as an Oncogene by the Activation of BMI-1-Mediated INK4a/ARF Pathway and Akt Pathway

Content Provider	Springer Nature Link
Author	Liu, Yan Long Jiang, Shi Xiong Yang, Yan Mei Xu, Hui Liu, Jing Lei Wang, Xi Shan
Copyright Year	2011
Abstract	Recent studies provided strong support for the view that ubiquitin-specific protease 22 (USP22) plays a central role in cell-cycle progression and also in pathological processes such as oncogenesis. We have recently shown that USP22 levels are elevated in colorectal carcinoma with associated increase in the expression of several cell-cycle-related genes. However, the precise mechanism for these functions of USP22 at molecular level has not been fully elucidated. Currently, we investigated the role of USP22 in human colorectal cancer (CRC). We observed that USP22 expression was statistically significantly correlated positively with that of BMI-1, c-Myc and both, pAkt (Ser473), and pAkt (Thr308), in primary tumor tissues from 43 CRC patients. Down-regulation of USP22 expression in HCT116 colorectal cancer cells by siRNA resulted in the accumulation of cells in the G1 phase of the cell cycle. RNAi-knockdown of USP22 in HCT16 cells also led to the repression of BMI-1 and was accompanied by the up-regulation of p16INK4a and p14ARF, with a consequent decrease in E2F1 and p53 levels. In addition, down-regulation of c-Myc-targeted cyclin D2 was also noticed in cells treated with USP22-siRNA. Furthermore, our results showed that USP22 deletion also caused down-regulation of Akt/GSK3β activity, which can also contribute to the reduction of cyclin D2. Collectively, our current results suggest that USP22 may act as an oncogene in CRC as it positively regulates cell cycle via both BMI-1-mediated INK4a/ARF pathway and Akt signaling pathway.
Starting Page	229
Ending Page	235
Page Count	7
File Format	PDF
ISSN	10859195
Journal	Cell Biochemistry and Biophysics
Volume Number	62
Issue Number	1
e-ISSN	15590283
Language	English
Publisher	Humana Press Inc
Publisher Date	2011-09-18
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	USP22 BMI-1 INK4a/ARF Akt Colorectal cancer Biophysics and Biological Physics Cell Biology Biochemistry Pharmacology/Toxicology Biotechnology
Content Type	Text
Resource Type	Article
Subject	Cell Biology Medicine Biochemistry Biophysics

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