PSMD2 regulates breast cancer cell proliferation and cell cycle progression by modulating p21 and p27 proteasomal degradation

Cancer Letters
Yunhai LiGuosheng Ren

Abstract

Alterations in the ubiquitin-proteasome system (UPS) and UPS-associated proteins have been implicated in the development of many human malignancies. In this study, we investigated the expression profiles of 797 UPS-related genes using HiSeq data from The Cancer Genome Atlas and identified that PSMD2 was markedly upregulated in breast cancer. High PSMD2 expression was significantly correlated with poor prognosis. Gene set enrichment analysis revealed that transcriptome signatures involving proliferation, cell cycle, and apoptosis were critically enriched in specimens with elevated PSMD2. Consistently, PSMD2 knockdown inhibited cell proliferation and arrested cell cycle at G0/G1 phase in vitro, as well as suppressed tumor growth in vivo. Rescue assays demonstrated that the cell cycle arrest caused by silencing PSMD2 partially resulted from increased p21 and/or p27. Mechanically, PSMD2 physically interacted with p21 and p27 and mediated their ubiquitin-proteasome degradation with the cooperation of USP14. Notably, intratumor injection of therapeutic PSMD2 small interfering RNA effectively delayed xenograft tumor growth accompanied by p21 and p27 upregulation. These data provide novel insight into the role of PSMD2 in breast cancer...Continue Reading

Citations

Jan 25, 2019·Genetic Testing and Molecular Biomarkers·Dazhi WangLanying Wang
Aug 17, 2019·Cancers·Bahar Shamloo, Sinem Usluer
Mar 25, 2019·The Kaohsiung Journal of Medical Sciences·Zi-Ming HuangFeng Xu
Mar 12, 2021·Journal of Cellular and Molecular Medicine·Qianxue WuHongyuan Li
Apr 4, 2021·Experimental Cell Research·Xianbiao ShiYongzhong Yao
Aug 10, 2021·Frontiers in Genetics·Jia LeiRuixia Guo
Sep 1, 2021·Biomedicine & Pharmacotherapy = Biomédecine & Pharmacothérapie·T O ConceiçãoD A Maria

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