ZBRK1, a novel tumor suppressor, activates VHL gene transcription through formation of a complex with VHL and p300 in renal cancer
ZBRK1, a novel tumor suppressor, activates VHL gene transcription through formation of a complex with VHL and p300 in renal cancer
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.
- University of Minnesota United States
- Union Hospital China (People's Republic of)
- WISTAR INSTITUTE
- University of Minesota United States
- University of Minnesota Crookston United States
Transcription, Genetic, Gene Expression Profiling, Mice, Nude, Prognosis, Kidney Neoplasms, Gene Expression Regulation, Neoplastic, Repressor Proteins, Cell Movement, Von Hippel-Lindau Tumor Suppressor Protein, Disease Progression, Animals, Humans, Genes, Tumor Suppressor, Neoplasm Invasiveness, Promoter Regions, Genetic, Carcinoma, Renal Cell, E1A-Associated p300 Protein, Protein Binding
Transcription, Genetic, Gene Expression Profiling, Mice, Nude, Prognosis, Kidney Neoplasms, Gene Expression Regulation, Neoplastic, Repressor Proteins, Cell Movement, Von Hippel-Lindau Tumor Suppressor Protein, Disease Progression, Animals, Humans, Genes, Tumor Suppressor, Neoplasm Invasiveness, Promoter Regions, Genetic, Carcinoma, Renal Cell, E1A-Associated p300 Protein, Protein Binding
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