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Complement-Mediated Synapse Loss

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wiki page Created: 2026-04-02T07:19:55 By: crosslink-migration Quality: 50% ✓ SciDEX ID: wiki-mechanisms-complement-mediated-syna
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Complement-Mediated Synapse Loss

Overview

Complement-mediated synapse loss is a pathological mechanism in which the innate immune [complement system](/entities/complement-system) aberrantly tags functional synapses for elimination by [microglia](/cell-types/microglia) and [astrocytes](/cell-types/astrocytes). Originally discovered as a normal developmental pruning mechanism, inappropriate reactivation of complement-dependent synaptic elimination in the adult brain has emerged as a major contributor to cognitive decline in Alzheimer's disease, Huntington's disease, multiple sclerosis, frontotemporal dementia, and other neurodegenerative conditions[@stevens2007].

The discovery that complement proteins C1q and C3 mediate this synapse loss has opened new therapeutic avenues targeting upstream immune machinery rather than downstream protein aggregates.

The Complement System

The complement system is a cascade of plasma proteins that opsonize pathogens, recruit immune cells, and directly lyse targets. Three complement activation pathways converge at C3:

| Pathway | Initiator | Relevance to Neurodegeneration |
|---------|-----------|-------------------------------|
| Classical | C1q binding to immune complexes | Synapse tagging in disease |
| Lectin | Mannose-binding lectin | Less characterized in brain |
| Alternative | Spontaneous C3 activation | Chronic inflammation |

Key Complement Proteins in Synapse Elimination


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