VHL substrate transcription factor ZHX2 as an oncogenic driver in clear cell renal cell carcinoma

J Zhang, T Wu, J Simon, M Takada, R Saito, C Fan… - Science, 2018 - science.org
J Zhang, T Wu, J Simon, M Takada, R Saito, C Fan, XD Liu, E Jonasch, L Xie, X Chen, X Yao
Science, 2018science.org
Inactivation of the von Hippel-Lindau (VHL) E3 ubiquitin ligase protein is a hallmark of clear
cell renal cell carcinoma (ccRCC). Identifying how pathways affected by VHL loss contribute
to ccRCC remains challenging. We used a genome-wide in vitro expression strategy to
identify proteins that bind VHL when hydroxylated. Zinc fingers and homeoboxes 2 (ZHX2)
was found as a VHL target, and its hydroxylation allowed VHL to regulate its protein stability.
Tumor cells from ccRCC patients with VHL loss-of-function mutations usually had increased …
Inactivation of the von Hippel-Lindau (VHL) E3 ubiquitin ligase protein is a hallmark of clear cell renal cell carcinoma (ccRCC). Identifying how pathways affected by VHL loss contribute to ccRCC remains challenging. We used a genome-wide in vitro expression strategy to identify proteins that bind VHL when hydroxylated. Zinc fingers and homeoboxes 2 (ZHX2) was found as a VHL target, and its hydroxylation allowed VHL to regulate its protein stability. Tumor cells from ccRCC patients with VHL loss-of-function mutations usually had increased abundance and nuclear localization of ZHX2. Functionally, depletion of ZHX2 inhibited VHL-deficient ccRCC cell growth in vitro and in vivo. Mechanistically, integrated chromatin immunoprecipitation sequencing and microarray analysis showed that ZHX2 promoted nuclear factor κB activation. These studies reveal ZHX2 as a potential therapeutic target for ccRCC.
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