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2015 ; 6
(9
): 6959-76
Nephropedia Template TP
gab.com Text
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English Wikipedia
ZBRK1, a novel tumor suppressor, activates VHL gene transcription through
formation of a complex with VHL and p300 in renal cancer
#MMPMID25749518
Chen K
; Yu G
; Gumireddy K
; Li A
; Yao W
; Gao L
; Chen S
; Hao J
; Wang J
; Huang Q
; Xu H
; Ye Z
Oncotarget
2015[Mar]; 6
(9
): 6959-76
PMID25749518
show ga
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.