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2015 ; 29
(21
): 2244-57
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WSB1 promotes tumor metastasis by inducing pVHL degradation
#MMPMID26545811
Kim JJ
; Lee SB
; Jang J
; Yi SY
; Kim SH
; Han SA
; Lee JM
; Tong SY
; Vincelette ND
; Gao B
; Yin P
; Evans D
; Choi DW
; Qin B
; Liu T
; Zhang H
; Deng M
; Jen J
; Zhang J
; Wang L
; Lou Z
Genes Dev
2015[Nov]; 29
(21
): 2244-57
PMID26545811
show ga
The von Hippel-Lindau tumor suppressor pVHL is an E3 ligase that targets
hypoxia-inducible factors (HIFs). Mutation of VHL results in HIF up-regulation
and contributes to processes related to tumor progression such as invasion,
metastasis, and angiogenesis. However, very little is known with regard to
post-transcriptional regulation of pVHL. Here we show that WD repeat and SOCS
box-containing protein 1 (WSB1) is a negative regulator of pVHL through WSB1's E3
ligase activity. Mechanistically, WSB1 promotes pVHL ubiquitination and
proteasomal degradation, thereby stabilizing HIF under both normoxic and hypoxic
conditions. As a consequence, WSB1 up-regulates the expression of HIF-1?'s target
genes and promotes cancer invasion and metastasis through its effect on pVHL.
Consistent with this, WSB1 protein level negatively correlates with pVHL level
and metastasis-free survival in clinical samples. This work reveals a new
mechanism of pVHL's regulation by which cancer acquires invasiveness and
metastatic tendency.