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Background

Tripartite motif-containing proteins (TRIM) play a crucial role in carcinogenesis. Little attention has been focused on the possible functions of TRIM6 on carcinogenesis.

Methods

The expression levels of TRIM6 were assessed in colorectal cancer (CRC) samples. TRIM6 expression was knocked down in CRC cell lines, and subjected to Cell counting kit-8 (CCK-8), bromodeoxyuridine (BrdU) incorporation and cell cycle assays. Immunoprecipitation and proteomics analysis was performed to identify potential associated proteins of TRIM6.

Results

TRIM6 expression was up-regulated in CRC samples and TRIM6 expression may be an independent prognostic marker for CRC. Knocking down TRIM6 expression suppressed CRC cell proliferation, induced cell cycle arrested at G2/M phase and increased sensitivity to 5-fluorouracil and oxaliplatin. TIS21, an anti-proliferative protein involved in the regulation of G2/M arrest, was identified as an interaction partner of TRIM6. Moreover, CRC cells with TRIM6 overexpression showed decreased TIS21 protein stability. TIS21 ubiquitination was increased in CRC cells overexpressing TRIM6, but not in those overexpressing TRIM6 E3 catalytic mutant (C15A). Further, Lys5 was essential for TRIM6 mediated TIS21 ubiquitination. TIS21 overexpression reversed the induced effects of TRIM6 overexpression on CRC cell proliferation, and the levels of forkhead box M1 (FoxM1), phosphorylated FoxM1, Cyclin B1 and c-Myc. Thiostrepton, a specific inhibitor for FoxM1, was less effective in anti-proliferative activity against CRC cells with lower level of TRIM6 in vitro and in vivo.

Conclusions

Our study suggests that TRIM6 promotes the progression of CRC via TIS21/FoxM1."xsd:string
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http://purl.uniprot.org/citations/31992359http://purl.uniprot.org/core/author"Li H."xsd:string
http://purl.uniprot.org/citations/31992359http://purl.uniprot.org/core/author"Sun Y."xsd:string
http://purl.uniprot.org/citations/31992359http://purl.uniprot.org/core/author"Wang Y."xsd:string
http://purl.uniprot.org/citations/31992359http://purl.uniprot.org/core/author"Zhou C."xsd:string
http://purl.uniprot.org/citations/31992359http://purl.uniprot.org/core/author"Shen Z."xsd:string
http://purl.uniprot.org/citations/31992359http://purl.uniprot.org/core/author"Zheng S."xsd:string
http://purl.uniprot.org/citations/31992359http://purl.uniprot.org/core/date"2020"xsd:gYear
http://purl.uniprot.org/citations/31992359http://purl.uniprot.org/core/name"J Exp Clin Cancer Res"xsd:string
http://purl.uniprot.org/citations/31992359http://purl.uniprot.org/core/pages"23"xsd:string
http://purl.uniprot.org/citations/31992359http://purl.uniprot.org/core/title"TRIM6 promotes colorectal cancer cells proliferation and response to thiostrepton by TIS21/FoxM1."xsd:string
http://purl.uniprot.org/citations/31992359http://purl.uniprot.org/core/volume"39"xsd:string
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