Gene silencing of USP1 by lentivirus effectively inhibits proliferation and invasion of human osteosarcoma cells

Liu,Jinbo; Zhu,Hongjun; Zhong,Ning; Jiang,Zifeng; Xu,Lele; Deng,Youping; Jiang,Zhenhuan; Wang,Hongwei; Wang,Jinzhi

doi:10.3892/ijo.2016.3752

Gene silencing of USP1 by lentivirus effectively inhibits proliferation and invasion of human osteosarcoma cells

Authors:
- Jinbo Liu
- Hongjun Zhu
- Ning Zhong
- Zifeng Jiang
- Lele Xu
- Youping Deng
- Zhenhuan Jiang
- Hongwei Wang
- Jinzhi Wang
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Affiliations: Department of Orthopaedics, The Third Affiliated Hospital of Soochow University, Changzhou, Jiangsu 213003, P.R. China, Department of Thoracic Surgery, The First People's Hospital of Shangqiu, Shangqiu, Henan 476100, P.R. China, Department of Thoracic Surgery, Kunshan First People's Hospital Affiliated to Jiangsu University, Kunshan, Jiangsu 215000, P.R. China, Clinical Laboratories, The University of Chicago Medical Center, Chicago, IL 60637, USA, Department of Gastroenterology, The First Affiliated Hospital of Soochow University, Suzhou, Jiangsu 215200, P.R. China, Department of Medicine, Rush University Medical Center, Chicago, IL 60612, USA, Department of Orthopaedics, People's Hospital of Yixing City, Yixing, Jiangsu 214200, P.R. China, Department of Medicine, University of Chicago, Chicago, IL 60637, USA, Department of Cell Biology, School of Medicine, Soochow University, Suzhou, Jiangsu 215007, P.R. China
Published online on: November 2, 2016 https://doi.org/10.3892/ijo.2016.3752
Pages: 2549-2557

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Abstract

Osteosarcoma is the most frequent malignant bone tumor, affecting the extremities of adolescents and young adults. Ubiquitin-specific protease 1 (USP1) plays a critical role in many cellular processes including proteasome degradation, chromatin remodeling and cell cycle regulation. In the present study, we discovered that USP1 was overexpressed in 26 out of 30 osteosarcoma tissues compared to cartilage tumor tissues and normal bone tissues. We then constructed a lentiviral vector mediating RNA interference (RNAi) targeting USP1 and demonstrated that it significantly suppressed the mRNA and protein expression of the USP1 gene in U2OS cells. Knockdown of USP1 inhibited the growth and colony-forming, as well as significantly reduced the invasiveness of U2OS cells. Western blot analysis indicated that suppression of USP1 downregulated the expression of many proteins including SIK2, MMP-2, GSK-3β, Bcl-2, Stat3, cyclin E1, Notch1, Wnt-1 and cyclin A1. Most of these proteins are associated with tumor genesis and development. RNAi of SIK2 significantly decreased SIK2 protein expression and inhibited the ability of forming colonies, as well as induced apoptosis and reduced the invasiveness of U2OS cells. Collectively, our results suggest that silencing USP1 inhibits cell proliferation and invasion in U2OS cells. Therefore, USP1 may provide a novel therapeutic target for the treatment of osteosarcoma.

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