Reciprocal differentiation and tissue-specific pathogenesis of Th1, Th2, and Th17 cells in graft-versus-host disease.


In acute graft-versus-host disease (GVHD), naive donor CD4(+) T cells recognize alloantigens on host antigen-presenting cells and differentiate into T helper (Th) subsets (Th1, Th2, and Th17 cells), but the role of Th subsets in GVHD pathogenesis is incompletely characterized. Here we report that, in an MHC-mismatched model of C57BL/6 donor to BALB/c recipient, WT donor CD4(+) T cells predominantly differentiated into Th1 cells and preferentially mediated GVHD tissue damage in gut and liver. However, absence of interferon-gamma (IFN-gamma) in CD4(+) T cells resulted in augmented Th2 and Th17 differentiation and exacerbated tissue damage in lung and skin; absence of both IL-4 and IFN-gamma resulted in augmented Th17 differentiation and preferential, although not exclusive, tissue damage in skin; and absence of both IFN-gamma and IL-17 led to further augmentation of Th2 differentiation and idiopathic pneumonia. The tissue-specific GVHD mediated by Th1, Th2, and Th17 cells was in part associated with their tissue-specific migration mediated by differential expression of chemokine receptors. Furthermore, lack of tissue expression of the IFN-gamma-inducible B7-H1 played a critical role in augmenting the Th2-mediated idiopathic pneumonia. These results indicate donor CD4(+) T cells can reciprocally differentiate into Th1, Th2, and Th17 cells that mediate organ-specific GVHD.

DOI: 10.1182/blood-2009-05-219402

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@article{Yi2009ReciprocalDA, title={Reciprocal differentiation and tissue-specific pathogenesis of Th1, Th2, and Th17 cells in graft-versus-host disease.}, author={Tangsheng Yi and Ying Chen and Lin Wang and Gong Du and Daniel Huang and Dongchang Zhao and Heather Johnston and James Young and Ivan Todorov and Dale T Umetsu and Lieping Chen and Yoichiro Iwakura and Fouad Kandeel and Stephen Forman and Defu Zeng}, journal={Blood}, year={2009}, volume={114 14}, pages={3101-12} }