Abstract
Multiple sclerosis (MS) is an immune mediated demyelinating disease of the central nervous system (CNS). The importance of immune cells to MS pathology is supported by clinical data linking the depletion of T and B cells, or the prevention of their migration into the brain with significant reduction in relapses and development of new lesions. In vitro studies, preclinical animal models and encouraging data with the anti-IL-17A antibody secukinumab in a small proof of concept study in man, indicate that IL-17A, a key interleukin associated with many inflammatory and autoimmune diseases, may be involved in MS. Not only cells involved in adaptive immune responses such as Th17 cells and cytotoxic T cells, or innate immune responses such as mucosa-associated invariant T (MAIT) cells and γδT cells, but also CNS resident cells such as astrocytes and oligodendrocytes might contribute to the local production of IL-17A. IL-17A synergizes with other proinflammatory cytokines, by inducing the release of additional cytokines, mediators of tissue damage and chemokines, that recruit new inflammatory cells. IL-17A adversely affects the functions of microglia, astrocytes, oligodendrocytes, neurons, neural precursor cells and endothelial cells. Blockade of IL-17A might be beneficial to MS patients not only by inhibiting inflammation and tissue destruction, but also by enhancing repair processes.
Keywords: IL-17, IL17RA, IL-17RC, multiple sclerosis, secukinumab, Tc17, Th17 cells.
Graphical Abstract
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