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Currently, no transplantable gastric cancer syngeneic animal models exist; therefore, we set out to establish a mouse gastric carcinoma cell line, which was named mouse gastric carcinoma cell line 3I (MGCC3I), from forestomach carcinoma developed in benzo[a]pyrene\u2010treated ICR mice. MGCC3I cells showed epithelial\u2010like morphology, multinuclear giant cell formation, and retained an intestinal phenotype, which are similar to human gastric cancer carcinoma cells. The expression of gastric cancer markers MUC1, MUC2, and MUC5AC, and oncogenes c\u2010<jats:italic>myc<\/jats:italic>, c\u2010met, cyclin E1, and cancer stem cell marker CD44 was determined in MGCC3I cells. MGCC3I cells formed poorly differentiated stomach tumors following orthotopic implantation into the stomachs of syngeneic ICR mice. Histone deacetylase inhibitors are recognized as a new class of anticancer drugs. The immunological therapeutic effects of the histone deacetylase inhibitors sodium butyrate and valproic acid were evaluated in this new animal tumor model. Sodium butyrate inhibited MGCC3I stomach tumor formation in animal models. Increased tumor infiltration by CD8 T cells and neutrophils was observed in mice treated with sodium butyrate or valproic acid. Depletion of CD8 T cells significantly attenuated tumor regression mediated by histone deacetylase inhibitors, which is correlated with enhancement of the MHC class I pathway in MGCC3I cells. Taken together, we have successfully established an orthotopic transplantable gastric tumor animal model and demonstrated its usefulness in revealing the role of CD8 T cells in the therapeutic effects of sodium butyrate. \u00a9 2010 Wiley\u2010Liss, Inc.<\/jats:p>","DOI":"10.1002\/mc.20668","type":"journal-article","created":{"date-parts":[[2010,8,29]],"date-time":"2010-08-29T17:58:24Z","timestamp":1283104704000},"page":"739-750","source":"Crossref","is-referenced-by-count":13,"title":["Establishment of an orthotopic transplantable gastric cancer animal model for studying the immunological effects of new cancer therapeutic 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