CD4 T Cells but Not Th17 Cells Are Required for Mouse Lung Transplant Obliterative Bronchiolitis

American Journal of Transplantation : Official Journal of the American Society of Transplantation and the American Society of Transplant Surgeons
Qiang WuRebecca A Shilling

Abstract

Lung transplant survival is limited by obliterative bronchiolitis (OB), but the mechanisms of OB development are unknown. Previous studies in a mouse model of orthotopic lung transplantation suggested a requirement for IL-17. We have used this orthotopic mouse model to investigate the source of IL-17A and the requirement for T cells producing IL-17A. The major sources of IL-17A were CD4(+) T cells and γδ T cells. Depletion of CD4(+) T cells led to a significantly decreased frequency and number of IL-17A(+) lymphocytes and was sufficient to prevent acute rejection and OB. However, mice with STAT3-deficient T cells, which are unable to differentiate into Th17 cells, rejected lung allografts and developed OB similar to control mice. The frequency of IL-17A(+) cells was not decreased in mice with STAT3-deficient T cells due mainly to the presence of IL-17A(+) γδ T cells. Deficiency of γδ T cells also did not affect the development of airway fibrosis. Our data suggest that CD4(+) T cells are required for OB development and expansion of IL-17A responses in the lung, while Th17 and γδ T cells are not absolutely required and may compensate for each other.

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Citations

Jan 13, 2016·The Journal of Heart and Lung Transplantation : the Official Publication of the International Society for Heart Transplantation·Yoshito YamadaWolfgang Jungraithmayr
Sep 22, 2016·Immunology and Cell Biology·Pawan K GuptaRebecca A Shilling
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