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2017 ; 8
(20
): 32683-32695
Nephropedia Template TP
gab.com Text
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English Wikipedia
USP22 drives colorectal cancer invasion and metastasis via epithelial-mesenchymal
transition by activating AP4
#MMPMID28427243
Li Y
; Yang Y
; Li J
; Liu H
; Chen F
; Li B
; Cui B
; Liu Y
Oncotarget
2017[May]; 8
(20
): 32683-32695
PMID28427243
show ga
Ubiquitin specific peptidase 22 (USP22), a putative cancer stem cell marker, is
overexpressed in liver metastases of colorectal cancer (CRC). However, the
mechanism by which USP22 promotes CRC metastasis remains largely unknown. Here,
we report that USP22 and AP4 are simultaneously overexpressed during
TGF-?1-induced CRC cell epithelial-mesenchymal transition (EMT). USP22
up-regulation enhances CRC cell migration and invasion and EMT-related marker and
AP4 expression, but these effects are partly blocked by AP4 knockdown. In
addition, USP22 binds to the promoter region of AP4 to activate its
transcription. In vivo, elevated USP22 expression promotes CRC cell metastasis to
the lungs in nude mice, as evidenced by the fact that CRC metastatic nodules
stain deeply positive for USP22 and AP4. In human CRC tissues, the genes encoding
USP22 and AP4 are overexpressed in metastatic liver lesions compared with primary
cancer tissues, and their overexpression is significantly associated with poor
CRC patient survival. These findings indicate that USP22 and AP4 may serve as
prognostic markers for predicting the risk of developing distant metastases in
CRC.