Abstract
Central nervous system (CNS) injury incurs a rapid innate immune response, including that from macrophages derived from endogenous microglia and circulating monocytes infiltrating the lesion site. One example of such injury is the demyelination observed in the autoimmune disease multiple sclerosis (MS), where macrophages are implicated in both myelin injury and regeneration. Although initially microglia and monocyte-derived macrophages were considered to have identical origins, gene expression, and function, recent advances have revealed important distinctions in all three categories and have caused a paradigm shift in view of their unique identity and roles. This has important consequences for understanding their individual contribution to neurological function and therapeutic targeting of these populations in diseases like MS. Here, we address the differences between CNS endogenous and exogenously-derived macrophages with a particular focus on myelin damage and regeneration.
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