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- W20176790 abstract "AIMS: TIPE2 is a novel inflammation regulator, and the role of TIPE2 in colitis-induced colon cancer is not clear. The aim of this study was to test whether TIPE2 inhibits TLR4 pathway in colon cancer patients and to explore potential mechanism of TIPE2 in colon cancer by caspase-8. METHODS: Expression of TIPE2 and TLR4 in human colon cancer tissues and cell line HT-29 was detected by immunohistochemistry or real-time PCR. TIPE2 mRNA was suppressed by siRNA transfection and the transfection efficiency was proved by fluorescence microscopy and real-time PCR. TLR4 pathway was activated by treating the cells with 1 μg/ml LPS for 4 h. Caspase-8 activities were tested by colorimetric assay in four HT-29 cell groups. RESULTS: TIPE2 was expressed in the cytoplasm of colon cancer tissues and HT-29 cells. TIPE2 expression was more pronounced in colon cancer tissues compared to normal controls and it was related with lymph node metastasis and Dukes stage of colon cancer. TIPE2 expression was positively correlated with that of TLR4 in colon cancer (r = 0.7354). TIPE2 expression was knocked down successfully by siRNA transfection. Caspase-8 activity was elevated both in TIPE2 knockdown cells and in TLR4 activated cells compared to wild-type cells ( P< 0.05). And the caspase-8 activity was further increased in TIPE2 knockdown cells after TLR4 was activated ( P< 0.05). CONCLUSION: TIPE2 can inhibit caspase-8 activity in colon cancer cells. TIPE2 can regulate TLR4 inflammatory effect and inhibit further amplification of cascade reaction via caspase-8, which provides one new therapeutic target for clinical treatment schedule. Abbreviations: TIPE2, the tumor necrosis factor (TNF)-α-induced protein 8-like-2; TCR, T cell receptor; TLR4, toll-like receptor 4; NF-κ, nuclear factor-κ ;I L-1β, interleukin-1β; LPS, lipopolysaccharide; Cox-2, cyclooxygenase 2; EGFR, epidermal growth factor receptor" @default.
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- W20176790 date "2014-06-12" @default.
- W20176790 modified "2023-10-14" @default.
- W20176790 title "A novel inflammatory regulator TIPE2 inhibits TLR4-mediated development of colon cancer via caspase-8" @default.
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- W20176790 doi "https://doi.org/10.3233/cbm-140402" @default.
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