IFN-γ induces MHCII expression on IECs.

<p>(A) Frequency of CD45.2⁻ EpCAM⁺ MHCII⁺ intestinal epithelial cells (IEC) isolated from Rag1−/− or Rag1−/− IFN-γ−/− mice that were adoptively transferred with CD4⁺ CD45RB^hi T cells from WT or IFN-γ−/− mice shown as means and SEM in representative histograms (<i>n</i> = 3 mice per group). (B–C) Frequency of CD45.2⁻ EpCAM⁺ MHCII⁺ IECs (B) and CD4⁺ T cells from the colonic intestinal epithelium (C) isolated from <i>H. hepaticus</i>-infected, anti-IL-10R mAb-administered pIV−/− K14 CIITA Tg, pIV+/− K14 CIITA Tg or pIV+/− K14 CIITA Tg that were treated with neutralizing anti-IFN-γ mAb. Shown are representative FACS plots, means and SEM from two pooled experiments (<i>n</i> = 4–7 mice per group). αIFN-y, anti-interferon-γ monoclonal antibodies; FSC, forward scatter; IFN, interferon; Rag, recombination activating gene; WT, wild type;