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  • Title: Inhibition of N-terminal ATPase on HSP90 attenuates colitis through enhanced Treg function.
    Author: Collins CB, Aherne CM, Yeckes A, Pound K, Eltzschig HK, Jedlicka P, de Zoeten EF.
    Journal: Mucosal Immunol; 2013 Sep; 6(5):960-71. PubMed ID: 23321985.
    Abstract:
    Inflammatory bowel disease (IBD) is a chronic inflammatory condition thought to reflect a failure of the enteral immune system to adequately regulate itself. Inflammatory stress drives upregulation of heat-shock proteins (HSPs), including the pro-inflammatory chaperone, HSP90. This protein sequesters the transcription factor, heat-shock factor 1 (HSF1) in the cytoplasm preventing transcription of a number of anti-inflammatory proteins. We hypothesized that inhibition of HSP90 would exert an anti-inflammatory effect and thereby attenuate intestinal inflammation in murine models of IBD. Inhibition of HSP90 with 17-allylaminogeldanamycin (17-AAG) reduced inflammation in acute dextran sodium sulfate and chronic CD45RB(High) colitis models coinciding with increased interleukin (IL)-10 production in the colon. Regulatory T cells (Tregs) from mice treated with 17-AAG demonstrated significantly greater suppressive capacity in vitro abolished in HSF1-/- or IL-10-/- cells. Finally, Tregs treated with 17-AAG exhibited increased nuclear localization of HSF1 with resultant upregulation of HSF1 response genes, including HSP70, HSP90 and IL-10.
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