Essential role for the overexpression of type I IFN-related genes in the improved chemotherapeutic response of Stat3−/− tumors. Essential role for the.

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Essential role for the overexpression of type I IFN-related genes in the improved chemotherapeutic response of Stat3−/− tumors. Essential role for the overexpression of type I IFN-related genes in the improved chemotherapeutic response of Stat3−/− tumors. A, type I IFN-related gene expression with or without MTX treatment (16 hours) was measured in WT, Stat3−/−, Stat3−/− Tg WT, and Stat3−/− Tg YF tumor cells. Ppia was used as endogenous control. The relative expression to untreated WT MCA205 cells was calculated by means of the 2–ddCT method and shown as fold-change. The y axis is log-scaled. For gene expression, the unpaired Student t test was applied. B and C, MCA205 tumor cells, WT (B) or Stat3−/− (C), were inoculated into immunocompetent mice. Once tumor size reached 20 to 45 mm2, mice were treated by intratumoral injection of DOXO. Neutralizing antibodies targeting CXCR3 or IFNAR1 were repeatedly injected on the very day of chemotherapy and 2, 4, 7 days later. Mouse IgG1 (200 μg/injection) was used as an isotype control. All groups included 6 mice. Experiments were repeated twice yielding similar results. For tumor growth, the unpaired Mann–Whitney U test was used for statistical comparisons. *, P < 0.05; **, P < 0.01; ***, P < 0.001; ns, not significant. Heng Yang et al. Cancer Res 2015;75:3812-3822 ©2015 by American Association for Cancer Research