ArticlebioRxiv : the preprint server for biology2026
FcγR- and CD9-dependent synapse engulfing microglia in the thalamus drives cognitive impairment following cortical brain injury.
Article in bioRxiv : the preprint server for biology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Various states of microglia appear in neuroinflammation, but their impact on brain function and behavior is not fully understood. Here we report that synapse engulfing microglia in the thalamus are crucial for cognitive impairment after cortical brain injury. Region-specific manipulations of reactive microglia in the chronic phase of injuries showed that microglial changes in the thalamus, but not in the hippocampus, impaired recognition memory. Single-cell RNA-sequencing analysis revealed the enrichment of synapse engulfing microglia in the thalamus, which developed in a CD9-dependent manner and caused synaptic loss and recognition memory deficits. In the thalamus, the blood-brain barrier was disrupted, and extravasated γ-immunoglobulins (IgG) co-localized with synapse engulfing microglia. Fc
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