Pathogenic Myelin-Reactive CD4+ T Helper Cell (None)

Pathogenic myelin-reactive CD4+ T helper cells are a subset of immune cells that recognize and respond to components of myelin, the insulating sheath around nerve fibers in the central nervous system (CNS). These autoreactive T cells play a central role in the development and progression of autoimmune demyelinating diseases such as multiple sclerosis (MS) and its animal model, experimental autoimmune encephalomyelitis (EAE). They become activated when they encounter myelin-derived antigens presented by antigen-presenting cells (APCs) via MHC class II molecules. Upon activation, they differentiate into various effector subsets—primarily Th1 and Th17—which secrete proinflammatory cytokines such as IFN-γ, IL-17, GM-CSF, and others. The inflammatory milieu created by these cytokines leads to recruitment of additional immune cells into the CNS, resulting in inflammation, demyelination, oligodendrocyte injury, and neurodegeneration.

Other names

Autoreactive CD4+ T cellMyelin-specific CD4+ T cellMS-associated CD4+ T cellEAE-associated CD4+ T cell

Targeting these pathogenic populations or their effector functions is a major focus for immunomodulatory therapies in MS. Strategies include blocking key cytokines like IL‑17 or GM‑CSF or modulating costimulatory pathways involved in their activation/differentiation.