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Controversies in Neurology |

Multiple Sclerosis Is an Inflammatory T-Cell–Mediated Autoimmune Disease

Howard L. Weiner, MD
Arch Neurol. 2004;61(10):1613-1615. doi:10.1001/archneur.61.10.1613.
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The etiology and pathogenesis of multiple sclerosis (MS) have been much debated during the past 50 years. It is now recognized that MS is a complex disease with different clinical and pathological phenotypes, perhaps reflecting different pathways to tissue injury. Thus, MS may not be a single disease entity. Nonetheless, with recent advances in immunology and magnetic resonance imaging and the demonstration that immunomodulatory treatment can have an ameliorating effect on the disease process, it is now clear that the core process in MS is inflammatory, with T cells and their mediators triggering injury of axons and their myelin sheaths through a complex sequence of events. The T- cell–mediated inflammation is driven by an autoimmune process, which in turn can trigger a degenerative phase that is immune independent. As described below, a large body of evidence suggests there is a Th1-type bias in MS (interferon [IFN] gamma, interleukin [IL]12, IL-18, and osteopontin) and that factors associated with Th2-type (IL-4 and IL-10) or Th3-type (transforming growth factor β) responses are beneficial in MS.

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