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- W1512014737 abstract "Proceedings: AACR Annual Meeting 2014; April 5-9, 2014; San Diego, CAWe have previously demonstrated that type II interleukin 1 receptor (IL1R2), which is an IL-1 decoy receptor and inhibits exogenous IL-1 signaling, activates the expression of several proinflammatory cytokines. We also found that enhanced expression of IL1R2 promotes tumor growth and increases tumor angiogenesis through activated IL-6/VEGF-A signalings. Recently, we observed a close association of enhanced expression of IL1R2 and Regorafenib resistance in colorectal cancer (CRC) cell lines. Regorafenib is the newly approved multi-kinase inhibitor used for treatment of late-stage metastatic CRC by US FDA. To have a better use of Regorafenib against CRC, we conducted experiments to understand the mechanism underlying which IL1R2 is involved in Regorafenib resistance. In the present study, we demonstrated that silencing of IL1R2 in HT29 cell overcame its resistance to Regorafenib whereas ectopic expression of IL1R2 decreased the sensitivity of HCT116 cell to Regorafenib in in vitro and in vivo systems. IL1R2 silencing also enhanced the apoptotic proteins expression in Regorafenib-treated cells. In addition, we have established Regorafenib-resistant DLD-1 colon cancer cells by growing them in the presence of Regorafenib. Consistently, higher IL1R2 expression was found in Regorafenib-resistant cells than the parental cells. Mechanistically, we observed that Regorafenib treatment significantly resulted in enhanced expression of extracellular-signal-regulated kinase (Erk), which functions as a survival factor, in IL1R2-overexpressing cells. Therefore, pretreatment of IL1R2-overepressing CRC cells with Erk inhibitor, U0126, reversed their Regorafenib resistance, suggesting that Erk signaling cascade is crucial in Regorafenib resistance resulted from IL1R2 overexpression. Taken together, our present study suggested that combination of Regorafenib and Erk inhibitor is a rationale regime to overcome IL1R2 overexpression-induced Regorafenib resistance in CRC patients, but also IL1R2 is a potential biomarker for colon cancer therapy.Citation Format: Ai-Chung Mar, Chun-Ho Chu, Te-Chang Lee. Erk inhibitor overcomes type II interleukin 1 receptor, a decoy receptor, associated Regorafenib resistance in colorectal carcinoma. [abstract]. In: Proceedings of the 105th Annual Meeting of the American Association for Cancer Research; 2014 Apr 5-9; San Diego, CA. Philadelphia (PA): AACR; Cancer Res 2014;74(19 Suppl):Abstract nr 1714. doi:10.1158/1538-7445.AM2014-1714" @default.
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- W1512014737 date "2014-09-30" @default.
- W1512014737 modified "2023-09-26" @default.
- W1512014737 title "Abstract 1714: Erk inhibitor overcomes type II interleukin 1 receptor, a decoy receptor, associated Regorafenib resistance in colorectal carcinoma" @default.
- W1512014737 doi "https://doi.org/10.1158/1538-7445.am2014-1714" @default.
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