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2015 ; 362
(1
): 70-82
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English Wikipedia
FBXO11 promotes ubiquitination of the Snail family of transcription factors in
cancer progression and epidermal development
#MMPMID25827072
Jin Y
; Shenoy AK
; Doernberg S
; Chen H
; Luo H
; Shen H
; Lin T
; Tarrash M
; Cai Q
; Hu X
; Fiske R
; Chen T
; Wu L
; Mohammed KA
; Rottiers V
; Lee SS
; Lu J
Cancer Lett
2015[Jun]; 362
(1
): 70-82
PMID25827072
show ga
The Snail family of transcription factors are core inducers of
epithelial-to-mesenchymal transition (EMT). Here we show that the F-box protein
FBXO11 recognizes and promotes ubiquitin-mediated degradation of multiple Snail
family members including Scratch. The association between FBXO11 and Snai1 in
vitro is independent of Snai1 phosphorylation. Overexpression of FBXO11 in
mesenchymal cells reduces Snail protein abundance and cellular invasiveness.
Conversely, depletion of endogenous FBXO11 in epithelial cancer cells causes
Snail protein accumulation, EMT, and tumor invasion, as well as loss of estrogen
receptor expression in breast cancer cells. Expression of FBXO11 is downregulated
by EMT-inducing signals TGF? and nickel. In human cancer, high FBXO11 levels
correlate with expression of epithelial markers and favorable prognosis. The
results suggest that FBXO11 sustains the epithelial state and inhibits cancer
progression. Inactivation of FBXO11 in mice leads to neonatal lethality,
epidermal thickening, and increased Snail protein levels in epidermis, validating
that FBXO11 is a physiological ubiquitin ligase of Snail. Moreover, in C.
elegans, the FBXO11 mutant phenotype is attributed to the Snail factors as it is
suppressed by inactivation/depletion of Snail homologs. Collectively, these
findings suggest that the FBXO11-Snail regulatory axis is evolutionarily
conserved and critically governs carcinoma progression and mammalian epidermal
development.