期刊
FRONTIERS IN CELLULAR NEUROSCIENCE
卷 14, 期 -, 页码 -出版社
FRONTIERS MEDIA SA
DOI: 10.3389/fncel.2020.600656
关键词
complement; multiple sclerosis; pathology; outside-in; inside-out
资金
- Global Multiple Sclerosis Innovation (GMSI) award
- Multiple Sclerosis Society of Canada Research Foundation (MSSRF)
- National Multiple Sclerosis Society [RG-1602-07777]
- UK Dementia Research Institute
- MRC [UKDRI-3002] Funding Source: UKRI
Research in the past 15 years has uncovered the significant role of complement in the central nervous system (CNS), impacting various processes such as cell migration, synaptic elimination during development, and damage to nerve cells in neurologic disorders and injury. Evidence suggests that complement production from CNS-resident cells, along with intracellular complement functions, may play a crucial role in shaping synaptic circuits and pathology within the brain.
The last 15 years have seen an explosion of new findings on the role of complement, a major arm of the immune system, in the central nervous system (CNS) compartment including contributions to cell migration, elimination of synapse during development, aberrant synapse pruning in neurologic disorders, damage to nerve cells in autoimmune diseases, and traumatic injury. Activation of the complement system in multiple sclerosis (MS) is typically thought to occur as part of a primary (auto)immune response from the periphery (the outside) against CNS antigens (the inside). However, evidence of local complement production from CNS-resident cells, intracellular complement functions, and the more recently discovered role of early complement components in shaping synaptic circuits in the absence of inflammation opens up the possibility that complement-related sequelae may start and finish within the brain itself. In this review, the complement system will be introduced, followed by evidence that implicates complement in shaping the developing, adult, and normal aging CNS as well as its contribution to pathology in neurodegenerative conditions. Discussion of data supporting outside-in vs. inside-out roles of complement in MS will be presented, concluded by thoughts on potential approaches to therapies targeting specific elements of the complement system.
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