Secreted clusterin (sCLU) regulates cell proliferation and chemosensitivity to cisplatin by modulating ERK1/2 signals in human osteosarcoma cells

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• 作者：Hai Huang (5)
  Linna Wang (6)
  Mingyu Li (7)
  Xiaohui Wang (8)
  Lin Zhang (9)
  
  5. Department of Orthopedics ; the Linyi People鈥檚 Hospital ; Linyi ; Shangdong ; 276003 ; China
  6. Department of Clinical Laboratory ; Qingdao Sanatorium of Shandong Province ; Qingdao ; China
  7. Department of NICU ; the Affiliated Hospital of QingDao University ; QingDao ; 266003 ; China
  8. Department of Orthopedics ; the Central Hospital of Yishui ; Linyi ; Shan Dong Province ; 276400 ; China
  9. Department of Anesthesiology ; the Affiliated Hospital of QingDao University ; QinDao ; 266003 ; China
  
• 关键词：Osteosarcoma ; Chemotherapy ; Secreted clusterin ; RNA interference ; ERK activator kinase 1/2
• 刊名：World Journal of Surgical Oncology
• 出版年：2014
• 出版时间：December 2014
• 年：2014
• 卷：12
• 期：1
• 全文大小：1,836 KB
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• 刊物主题：Surgical Oncology;
• 出版者：BioMed Central
• ISSN：1477-7819

文摘

Background Several studies have shown that secreted clusterin (sCLU) up-regulation in multi-drug resistant osteosarcoma (OS) cells relates to enhanced drug resistance. Furthermore, sCLU silencing directed against sCLU induces significant reduction of cellular growth and sensitizes OS cells to chemotherapy. However, the molecular mechanisms underlying the effect of sCLU on OS cells are not known. Methods To evaluate the roles and possible mechanisms of sCLU in chemoresistance of OS cells to cisplatin (DPP), we utilized RNA interference to knockdown sCLU expression in the sCLU-rich U-2 OS cells and to overexpress sCLU in the sCLU-poorer KH OS cells, and further assessed the cell viability and chemosensitivity to DDP as well as possible signaling transduction pathways. Results The data showed that sCLU depletion inhibited growth and sensitized sCLU-rich U-2 OS cells to cisplatin in vitro and in vivo by inducing inactivation of ERK1/2, and sCLU overexpression promoted growth and increased resistance of sCLU-less KH OS cells to cisplatin in vitro and in vivo by activation of ERK1/2. Conclusions The data also suggests critical roles of sCLU in OS cell chemoresistance to DPP and raises the possibility of sCLU depletion as a promising approach to OS therapy.