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21 February 2018 : Laboratory Research

Preliminary Study of the Role F-Box Protein 32 (FBXO32) in Colorectal Neoplasms Through the Transforming Growth Factor beta (TGF-β)/Smad4 Signalling Pathway

Xuemin Yuan12BCDEF, Zhen Zhang3BCEF, Kaitong Jiang2BEF, Xinguo Wang4BDF, Yanqing Li5AG*

DOI: 10.12659/MSM.908030

Med Sci Monit 2018; 24: LBR1080-1088

Abstract

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-β)/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.

Keywords: Colorectal Neoplasms, F-Box Proteins, Smad4 Protein, Transforming Growth Factor beta1

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Medical Science Monitor eISSN: 1643-3750
Medical Science Monitor eISSN: 1643-3750