Abstract
Multiple sclerosis (MS) is a chronic inflammatory demyelinating disease of the central nervous system (CNS). Both genetic and environmental causes for MS have been suggested. Recent genome-wide association studies revealed new susceptibility alleles for MS besides the HLA complex that are all related with immune functions. Whereas there is little evidence to support a purely environmental trigger for the disease in the sense of an infectious agent, the autoimmune hypothesis of MS is well established. Myelin antigen-specific CD4+ T cells become activated in the peripheral immune compartment, cross the blood-brain barrier and trigger the disease. Here, current concepts of the commitment of T cells to pro-inflammatory effector T helper cell lineages including Th17 cells that appear to be important inducers of organ-specific autoimmunity will be discussed.
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