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Thymic stromal lymphopoetin-induced expression of the endogenous inhibitory enzyme SLPI mediates recovery from colonic inflammation.

Authors:
Reardon C, Lechmann M, Brüstle A, Gareau MG, Shuman N, Philpott D, Ziegler SF, Mak TW
Affiliation:
Journal:
Immunity

Abstract

Thymic stromal lymphopoetin (TSLP) influences numerous immune functions, including those in the colonic mucosa. Here we report that TSLP-deficient (Tslp(-/-)) mice did not exhibit increased inflammation during dextran sodium sulfate (DSS)-induced colitis but failed to recover from disease, resulting in death. Increased localized neutrophil elastase (NE) activity during overt inflammation was observed in Tslp(-/-) mice and was paralleled by reduced expression of an endogenous inhibitor, secretory leukocyte peptidase inhibitor (SLPI). Pharmacological inhibition of NE or treatment with rSLPI reduced DSS-induced mortality in Tslp(-/-) mice. Signaling through TSLPR on nonhematopoietic cells was sufficient for recovery from DSS-induced colitis. Expression of the receptor occurred on intestinal epithelial cells (IEC), with stimulation inducing SLPI expression. Therefore, TSLP is critical in mediating mucosal healing after insult and functions in a nonredundant capacity that is independent of restraining T helper 1 (Th1) and Th17 cell cytokine production.

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