NFAT1 Regulates Systemic Autoimmunity through the Modulation of a Dendritic Cell Property

NFAT1 Regulates Systemic Autoimmunity through the Modulation of a Dendritic Cell Property
이충구채창석김기천박은실Ravi Verma조학림전창덕유영준임신혁
Issue Date
The journal of immunology : official journal of the American Association of Immunologists
VOL 199, NO 9-3062
The transcription factor NFAT1 plays a pivotal role in the homeostasis of T lymphocytes. However, its functional importance in non-CD4(+) T cells, especially in systemic immune disorders, is largely unknown. In this study, we report that NFAT1 regulates dendritic cell (DC) tolerance and suppresses systemic autoimmunity using the experimental autoimmune myasthenia gravis (EAMG) as a model. Myasthenia gravis and EAMG are T cell-dependent, Ab-mediated autoimmune disorders in which the acetylcholine receptor is the major autoantigen. NFAT1-knockout mice showed higher susceptibility to EAMG development with enhanced Th1/Th17 cell responses. NFAT1 deficiency led to a phenotypic alteration of DCs that show hyperactivation of NF-kappa B-mediated signaling pathways and enhanced binding of NF-kappa B (p50) to the promoters of IL-6 and IL-12. As a result, NFAT1-knockout DCs produced much higher levels of proinflammatory cytokines such as IL-1 beta, IL-6, IL-12, and TNF-alpha, which preferentially induce Th1/Th17 cell differentiation. Our data suggest that NFAT1 may limit the hyperactivation of the NF-kappa B-mediated proinflammatory response in DCs and suppress autoimmunity by serving as a key regulator of DC tolerance.
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