Abstract:
:Retinoic acid (RA) in the steady state enhances induction of Foxp3(+) regulatory T (Treg) cells and inhibits differentiation of Th1 and Th17 cells, thereby maintaining tolerance, but can in inflammatory conditions promote effector Th1 and Th17 cells that mediate inflammation. IL-17-producing γδ T cells have recently been shown to have a major pathogenic role in autoimmune diseases. Here, we examined the immunomodulatory effects of RA on γδ T cells. We found that RA had a dramatic suppressive effect on IL-17A and IL-17F production by γδ T cells stimulated with IL-1β and IL-23. RA suppressed RORγt, IL-1R and IL-23R expression in γδ T cells. Treatment of mice with RA suppressed IL-17 production by γδ T cells in vivo. Furthermore, treatment of T cells with RA attenuated their ability to induce disease in experimental autoimmune encephalomyelitis (EAE), a murine model for multiple sclerosis. This was associated with a reduction in the number of central nervous system-infiltrating γδ T cells, but also CD4(+) T cells that produced IL-17A, IL-17F or GM-CSF. Interestingly, treatment of γδ T cells with RA or removal of γδ T cells from a bulk population of T cells significantly reduced their capacity to induce EAE, demonstrating a critical role for γδ T cells in promoting pathogenic Th17 cells. Our findings demonstrate that the anti-inflammatory properties of RA are mediated in part by suppressing STAT3-mediated activation of cytokine production and cytokine receptor expression in γδ T cells, which suppresses their ability to activate Th17 cells.
journal_name
Immunol Cell Bioljournal_title
Immunology and cell biologyauthors
Raverdeau M,Breen CJ,Misiak A,Mills KHdoi
10.1038/icb.2016.39subject
Has Abstractpub_date
2016-09-01 00:00:00pages
763-73issue
8eissn
0818-9641issn
1440-1711pii
icb201639journal_volume
94pub_type
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