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T helper (Th) 17 cells are a subset of Th cells expressing interleukin- (IL-) 17 and initiating an inflammatory response in autoimmune diseases. Graft-versus-host disease (GVHD) is an immune inflammatory disease caused by interactions between the adaptive immunity of donor and recipient. The Th17 lineage exhibits proinflammatory activity and is believed to be a central player in GVHD. IL-1 performs a key function in immune responses and induces development of Th17 cells. Here, we show that blockade of IL-1 signaling suppresses Th17 cell differentiation and alleviates GVHD severity. We hypothesized that the IL-1 receptor antagonist (IL-1Ra) would suppress Th17 cell differentiation  in vitro  via inhibition of glycolysis-related genes. Blockade of IL-1 using IL-1Ra downregulated Th17 cell differentiation, an alloreactive T cell response, and expression of genes of the glycolysis pathway. Severity of GVHD was reduced in mice with a transplant of IL-Ra-treated cells, in comparison with control mice. To clarify the mechanisms via which IL-1Ra exerts the therapeutic effect, we demonstrated  in vivo  that IL-1Ra decreased the proportion of Th17 cells, increased the proportion of FoxP3-expressing T regulatory (T reg ) cells, and inhibited expression of glycolysis-related genes and suppressed Th17 cell development and B-cell activation. These results suggest that blockade of IL-1 signaling ameliorates GVHD via suppression of excessive T cell-related inflammation.

mediators of inflammation

IL-1 Receptor Blockade Alleviates Graft-versus-Host Disease through Downregulation of an Interleukin-1<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M1"><mml:mrow><mml:mi mathvariant="bold-italic">β</mml:mi></mml:mrow></mml:math>-Dependent Glycolytic Pathway in Th17 Cells

IL-1 Receptor Blockade Alleviates Graft-versus-Host Disease through Downregulation of an Interleukin-1β-Dependent Glycolytic Pathway in Th17 Cells