期刊
EUROPEAN JOURNAL OF IMMUNOLOGY
卷 39, 期 7, 页码 1864-1869出版社
WILEY
DOI: 10.1002/eji.200939305
关键词
Autoimmunity; EAE; IL-17; IL-23; T helper cells
类别
资金
- Swiss National Science Foundation
- US National MS-Society
- Swiss MS-Society
- Merck Serono, Geneva
- National Center for Competence in Research (NCCR-Neuro)
IL-23 but not IL-12 is essential for the development of autoimmune tissue inflammation in mice. Conversely, IL-12 and IL-23 impact on the polarization of Th1 and Th17 cells, respectively. While both polarized T helper populations can mediate autoimmune inflammation, their redundancy in the pathogenesis of EAE indicates that IL-23 exerts its crucial influence on the disease independent of its T helper polarizing capacity. To study the impact of IL-23 and IL-12 on the behavior of encephalitogenic T cells in Vivo, we generated BM-chimeric mice in which we can trace individual populations of IL-23 or IL-12 responsive T helper cells during EAE. We observed that T cells, which lack IL-12R beta 1 (no IL-12 and IL-23 signaling), fail to invade the CNS and do not acquire a Th17 phenotype. In contrast, loss of IL-12 signaling prevents Th1 polarization but does not prevent T-cell entry into the CNS. The loss of IL-12R engagement does not appear to alter T-cell expansion but leads to their accumulation in secondary lymphoid organs. We found that IL-23 licenses T cells to invade the target tissue and to exert their effector function, whereas IL-12 is critical for Th1 differentiation, but does not influence the pathogenic capacity of auto-reactive T helper cells in vivo.
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