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ZBRK1, a novel tumor suppressor, activates VHL gene transcription through formation of a complex with VHL and p300 in renal cancer

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单位: [1]Huazhong Univ Sci & Technol,Dept Urol,Tongji Med Coll,Tongji Hosp,Wuhan 430074,Peoples R China [2]Huazhong Univ Sci & Technol,Inst Urol,Tongji Med Coll,Tongji Hosp,Wuhan 430074,Peoples R China [3]Wistar Inst Anat & Biol, Philadelphia, PA 19104 USA [4]Huazhong Univ Sci & Technol, Dept Cardiol, Tongji Med Coll, Inst Cardiovasc Dis,Union Hosp, Wuhan 430074, Peoples R China [5]Wuhan Univ, Sch Basic Med Sci, Wuhan 430072, Peoples R China [6]Wuhan Univ, Cardiovasc Res Inst, Wuhan 430072, Peoples R China [7]Univ Minnesota, Hormel Inst, Dept Cell Death & Canc Genet, Austin, MN 55912 USA
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关键词: ZBRK1 VHL p300 renal cancer tumor suppressor

摘要:
Inactivation or mutation of the VHL gene causes various tumors, including clear cell renal cell carcinoma (ccRCC). In the present study, we identified ZBRK1 as a novel VHL interacting protein by yeast two-hybrid screening, and found a single ZBRK1-binding site located in the VHL promoter region. Ectopic expression of ZBRK1 increases transcriptional activity of the VHL, whereas the depletion of endogenous ZBRK1 by shRNA leads to reduction of VHL expression. We also demonstrate that the inhibition of VEGF transcription by ZBRK1 overexpression is dependent on VHL/HIF pathway. Moreover, VHL is confirmed to serve as a bridge component for the association of ZBRK1 and p300, which leads to an increase in ZBRK1 transcriptional activity in the VHL promoter. We further provide striking evidences that ZBRK1 acts as a tumor suppressor in renal carcinoma by a variety of in vitro and in vivo assays, and ZBRK1 may represent a molecular marker to distinguish patients with ccRCC at high risk from those with a better survival prognosis. Taken together, these findings suggest that ZBRK1 suppresses renal cancer progression perhaps by regulating VHL expression.

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出版当年[2014]版:
大类 | 2 区 医学
小类 | 2 区 肿瘤学 3 区 细胞生物学
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Q1 ONCOLOGY Q1 CELL BIOLOGY
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第一作者单位: [1]Huazhong Univ Sci & Technol,Dept Urol,Tongji Med Coll,Tongji Hosp,Wuhan 430074,Peoples R China [2]Huazhong Univ Sci & Technol,Inst Urol,Tongji Med Coll,Tongji Hosp,Wuhan 430074,Peoples R China
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通讯机构: [1]Huazhong Univ Sci & Technol,Dept Urol,Tongji Med Coll,Tongji Hosp,Wuhan 430074,Peoples R China [2]Huazhong Univ Sci & Technol,Inst Urol,Tongji Med Coll,Tongji Hosp,Wuhan 430074,Peoples R China
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