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• W2024002382 abstract "Proceedings: AACR 102nd Annual Meeting 2011‐‐ Apr 2‐6, 2011; Orlando, FLBACKGROUND:Enhanced activation of inflammatory cytokines signaling transductions have been suggested as a driving force in the development of gastric tumors. The suppressor of cytokine signaling (SOCS) family proteins are important negative regulator of proinflammatory cytokine signals and have been reported to be frequently silenced by DNA methylation of CpG islands in gastric cancer (GC). The aim of this in vitro assessment was to evaluate the role of SOCS-1 and SOCS-3 in the proliferation of GC cell through regulating cytokine signaling pathways. MATERIAL AND METHODS:Six GC cell lines (NUGC3, AGS, MKN45, NUGC4, MKN7, and MKN74) were used in this study. Methylation status of SOCS-1/-3 was assessed by methylation specific PCR. The concentrations of IL-6 in the cell culture supernatant was measured by ELISA. Adenovirus vectors encoding either SOCS-1 or SOCS-3 were constructed for gene delivery to GC cells. The status of activated kinases and downstream proteins were determined by Western blot analysis. Anti-proliferative effects in GC cells were assessed by WST-8 assay.RESULTS: In six GC cell lines used in our study, SOCS-1 and SOCS-3 genes were methylated except one cell line, and two cell lines (NUGC3, AGS) showed elevated endogenous IL-6 production with constitutively phosphorylated STAT3. Unexpectedly, anti-IL-6R antibody did not affect both of the cell proliferation and the status of phosphorylated STAT3 in these two cell lines. In contrast, adenovirus-mediated SOCS-1 /-3 gene delivery markedly reduced cell proliferation of these cells. The anti-proliferative effect of SOCS-1/-3 correlated with decreased levels of the activation of STAT3 and p38 MAPK. Cell proliferation assay confirmed that the blockade of JAK/STAT and p38 MAPK signaling pathways also reduced cell proliferation of these cell lines. CONCLUSIONS: Our results indicated that the DNA methylation of SOCS-1/-3 may be associated with GC proliferation, and highlighted an anti-proliferative potential of SOCS-1/-3 through the inhibition of JAK/STAT and p38 MAPK signaling pathways independently IL-6 signaling. Thus, DNA methylation of SOCS-1/-3 can be a molecular marker of GC progression, and their forced expression may represent a novel therapeutic application as a multi-growth signal inhibitor for GC treatment.Citation Format: {Authors}. {Abstract title} [abstract]. In: Proceedings of the 102nd Annual Meeting of the American Association for Cancer Research; 2011 Apr 2-6; Orlando, FL. Philadelphia (PA): AACR; Cancer Res 2011;71(8 Suppl):Abstract nr 1970. doi:10.1158/1538-7445.AM2011-1970" @default.
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• W2024002382 date "2011-04-15" @default.
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• W2024002382 title "Abstract 1970: SOCS-1,-3 gene delivery in gastric cancer cells induces a potent anti-proliferative effectviathe suppression of JAK/STAT and P38 MAPK signaling pathways" @default.
• W2024002382 doi "https://doi.org/10.1158/1538-7445.am2011-1970" @default.
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