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2018 ; 24
(ä): 1080-1088
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Preliminary Study of the Role F-Box Protein 32 (FBXO32) in Colorectal Neoplasms
Through the Transforming Growth Factor beta (TGF-?)/Smad4 Signalling Pathway
#MMPMID29465067
Yuan X
; Zhang Z
; Jiang K
; Wang X
; Li Y
Med Sci Monit
2018[Feb]; 24
(ä): 1080-1088
PMID29465067
show ga
BACKGROUND F-box protein 32 (FBXO32) (also known as atrogin-1), a member of the
F-box protein family, was recently shown to be a transforming growth factor beta
(TGF-?)/Smad4 target gene involved in regulating cell survival. It can be
transcriptionally silenced by epigenetic mechanisms in some cancers, but its role
in colorectal carcinoma (CRC) is unclear. We investigated the role of FBXO32 in
CRC and determined its prognostic significance. MATERIAL AND METHODS We used
real-time quantitative PCR, Western blot, and immunohistochemistry to elucidate
the role of FBXO32 in clinical specimens and primary CRC cell lines. Differences
in patient survival were determined by the Kaplan-Meier method and log-rank test.
RESULTS We found that the FBXO32 and SMAD4 levels were higher in normal tissues
than in CRC tissues, but PAI-1 and VEGF levels showed the opposite pattern. The
expressions of FBXO32 and SMAD4 were related to clinicopathological parameters in
CRC. Kaplan-Meier analyses showed that the 5-year overall survival of the
low-FBXO32 expression group was significantly shorter than that of the
high-FBXO32 expression group (p=0.010). CONCLUSIONS The fbxo32 gene is a novel
tumor suppressor that inhibits CRC progression by inducing differentiation.
Elevated expression of FBXO32 predicts longer survival in CRC patients.