Differential regulation of central nervous system autoimmunity by TH1 and TH17 cells

Abstract

Multiple sclerosis is an inflammatory, demyelinating disease of the central nervous system (CNS) characterized by a wide range of clinical signs1. The location of lesions in the CNS is variable and is a crucial determinant of clinical outcome. Multiple sclerosis is believed to be mediated by myelin-specific T cells, but the mechanisms that determine where T cells initiate inflammation are unknown. Differences in lesion distribution have been linked to the HLA complex, suggesting that T cell specificity influences sites of inflammation2. We demonstrate that T cells that are specific for different myelin epitopes generate populations characterized by different T helper type 17 (TH17) to T helper type 1 (TH1) ratios depending on the functional avidity of interactions between TCR and peptide-MHC complexes. Notably, the TH17:TH1 ratio of infiltrating T cells determines where inflammation occurs in the CNS. Myelin-specific T cells infiltrate the meninges throughout the CNS, regardless of the TH17:TH1 ratio. However, T cell infiltration and inflammation in the brain parenchyma occurs only when TH17 cells outnumber TH1 cells and trigger a disproportionate increase in interleukin-17 expression in the brain. In contrast, T cells showing a wide range of TH17:TH1 ratios induce spinal cord parenchymal inflammation. These findings reveal critical differences in the regulation of inflammation in the brain and spinal cord.

Cite this article

Stromnes, I., Cerretti, L., Liggitt, D. et al. Differential regulation of central nervous system autoimmunity by T_H1 and T_H17 cells. Nat Med 14, 337–342 (2008). https://doi.org/10.1038/nm1715

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