Female microglia exhibit heightened complement gene expression and pruning capacity via estrogen-regulated epigenetic sensitization, explaining the female AD risk advantage

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Synaptic pruning by microglia in neurodegeneration

What is the role of microglial synaptic pruning in Alzheimer's disease and other neurodegenerative conditions?

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Hypotheses from Same Analysis (6)

These hypotheses emerged from the same multi-agent debate that produced this hypothesis.

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graph TD
    sess_SDA_2026_04_02_gap_s["sess_SDA-2026-04-02-gap-synaptic-pruning-microglia_task_9aae8fc5"] -->|produced| SDA_2026_04_02_gap_synapt["SDA-2026-04-02-gap-synaptic-pruning-microglia"]
    A__oligomers["Aβ oligomers"] -->|activates| microglia["microglia"]
    A__oligomers_1["Aβ oligomers"] -->|causes| C1q_C3_CR3_upregulation["C1q/C3/CR3 upregulation"]
    C1q["C1q"] -->|activates| synaptic_phagocytosis["synaptic phagocytosis"]
    C1q_blockade["C1q blockade"] -.->|inhibits| synapse_loss["synapse loss"]
    complement_cascade["complement cascade"] -->|causes| synaptic_loss["synaptic loss"]
    synaptic_loss_2["synaptic loss"] -->|precedes| neurodegeneration["neurodegeneration"]
    TREM2["TREM2"] -->|required for| DAM_microglia_formation["DAM microglia formation"]
    TREM2_3["TREM2"] -->|regulates| microglial_survival["microglial survival"]
    TREM2_4["TREM2"] -->|regulates| microglial_proliferation["microglial proliferation"]
    TREM2_R47H_variant["TREM2 R47H variant"] -->|risk factor for| Alzheimer_s_disease["Alzheimer's disease"]
    TREM2_deficiency["TREM2 deficiency"] -->|impairs| plaque_containment["plaque containment"]
    style sess_SDA_2026_04_02_gap_s fill:#4fc3f7,stroke:#333,color:#000
    style SDA_2026_04_02_gap_synapt fill:#4fc3f7,stroke:#333,color:#000
    style A__oligomers fill:#81c784,stroke:#333,color:#000
    style microglia fill:#4fc3f7,stroke:#333,color:#000
    style A__oligomers_1 fill:#81c784,stroke:#333,color:#000
    style C1q_C3_CR3_upregulation fill:#4fc3f7,stroke:#333,color:#000
    style C1q fill:#4fc3f7,stroke:#333,color:#000
    style synaptic_phagocytosis fill:#4fc3f7,stroke:#333,color:#000
    style C1q_blockade fill:#4fc3f7,stroke:#333,color:#000
    style synapse_loss fill:#4fc3f7,stroke:#333,color:#000
    style complement_cascade fill:#81c784,stroke:#333,color:#000
    style synaptic_loss fill:#4fc3f7,stroke:#333,color:#000
    style synaptic_loss_2 fill:#4fc3f7,stroke:#333,color:#000
    style neurodegeneration fill:#ef5350,stroke:#333,color:#000
    style TREM2 fill:#ce93d8,stroke:#333,color:#000
    style DAM_microglia_formation fill:#4fc3f7,stroke:#333,color:#000
    style TREM2_3 fill:#ce93d8,stroke:#333,color:#000
    style microglial_survival fill:#4fc3f7,stroke:#333,color:#000
    style TREM2_4 fill:#ce93d8,stroke:#333,color:#000
    style microglial_proliferation fill:#4fc3f7,stroke:#333,color:#000
    style TREM2_R47H_variant fill:#ce93d8,stroke:#333,color:#000
    style Alzheimer_s_disease fill:#ef5350,stroke:#333,color:#000
    style TREM2_deficiency fill:#4fc3f7,stroke:#333,color:#000
    style plaque_containment fill:#4fc3f7,stroke:#333,color:#000

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