Gamma-secretase inhibitors alter Th1 and Th17 responses but do not inhibit EAE.

<p>B6 mice were immunized with MOG35-55 to induce active EAE. Beginning on the day after immunization, the mice were randomized and treated with DMSO or GSI every other day for 18 days. A. Clinical course of EAE. B. Peak clinical score of DMSO and GSI-treated mice. C. Cumulative EAE scores for DMSO and GSI-treated animals. T cell cytokine expression in CNS-infiltrating CD4+ T cells from DMSO or GSI-treated mice following the Peak of EAE. On day 17 post-immunization, CNS cells were isolated and intracellular cytokine staining performed. D. Expression of IL-17 and IFNγ. E. Expression of GM-CSF and IFNγ. Distribution of the percentages of cells expressing IFNγ (F), IL-17 (G), GM-CSF (H) or FoxP3 (I) among CNS-infiltrating CD4+ T cells. J-L, Presence of cytokine expression in the spleens of EAE mice on day 17 post-immunization. Distribution of the percentages of cells expressing IFNγ (J), IL-17 (K), GM-CSF (L). Symbols indicate the percentage of cells from individual mice. Also plotted are the mean and SEM for each treatment group. Open circles indicate DMSO treatment, filled squares indicate treatment with GSI. Error bars represent SEM. Asterisks indicate significant differences (* p<0.05, ** p<0.01 and ***p <0.001).