F-box protein FBXO31 is down-regulated in gastric cancer and negatively regulated by miR-17 and miR-20a
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Xinchao Zhang1, Ye Kong1, Xia Xu1, Huaixin Xing3, Yingjie Zhang4, Fengjuan Han2, Wenjuan Li2, Qing Yang2, Jiping Zeng1, Jihui Jia2 and Zhifang Liu1
1 Department of Biochemistry and Molecular Biology, School of Medicine, Shandong University, Jinan, P. R. China
2 Department of Microbiology, Key Laboratory for Experimental Teratology of Chinese Ministry of Education, School of Medicine, Shandong University, Jinan, P. R. China
3 Department of Anesthesiology, Shandong Cancer Hospital, Jinan, P.R. China.
4 Department of Radiation Oncology, Shandong Cancer Hospital; Jinan, P.R. China
Zhifang Liu, email:
Keywords: Gastric cancer; FBXO31; miR-20a; miR-17; CyclinD1
Received: April 23, 2014 Accepted: July 06, 2014 Published: July 08, 2014
FBXO31, a subunit of the SCF ubiquitin ligase, played a crucial role in neuronal development, DNA damage response and tumorigenesis. Here, we investigated the expression and prognosis value of FBXO31 in human primary gastric cancer (GC) samples. Meanwhile, the biological role and the regulation mechanism of FBXO31 were evaluated. We found that FBXO31 mRNA and protein was decreased dramatically in the GC tissue compared with the adjacent non-cancerous tissues. FBXO31 expression was significantly associated with tumor size, tumor infiltration, clinical grade and patients’ prognosis. FBXO31 overexpression significantly decreased colony formation and induced a G1-phase arrest and inhibited the expression of CyclinD1 protein in GC cells. Further evidence was obtained from knockdown of FBXO31. Ectopic expression of FBXO31 dramatically inhibited xenograft tumor growth in nude mice. miR-20a and miR-17 mimics inhibited, whereas the inhibitor of miR-20a and miR-17 increased, the expression of FBXO31, respectively. miR-20a and miR-17 directly bind to the 3’-UTR of FBXO31. The level of miR-20a and miR-17 in GC tissue was significantly higher than that in surrounding normal mucosa. Moreover, a highly significant negative correlation between miR-20a (miR-17) and FBXO31 was observed in these GC samples. Therefore, effective therapy targeting the miR-20a (miR-17)-FBXO31-CyclinD1 pathway may help control GC progression.
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