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Microglia mediate forgetting via complement-dependent synaptic elimination.

Chao Wang1,2, Huimin Yue1,2, Zhechun Hu1,2

  • 1Institute of Neuroscience and Department of Neurology of the Second Affiliated Hospital, NHC and CAMS Key Laboratory of Medical Neurobiology, Zhejiang University School of Medicine, Hangzhou 310058, China.

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Summary
This summary is machine-generated.

Microglia engulf synapses in the brain, causing memory forgetting. Inhibiting this process, particularly complement pathways, prevents memory loss and preserves engram cell connections.

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Area of Science:

  • Neuroscience
  • Immunology
  • Memory Research

Background:

  • Synapses in engram cells are crucial for memory storage.
  • Memory loss is associated with the weakening or loss of these synapses.
  • Microglia, the brain's immune cells, are implicated in synaptic plasticity.

Purpose of the Study:

  • To investigate the role of microglia in the forgetting of remote memories.
  • To elucidate the mechanisms by which microglia contribute to memory degradation.
  • To determine if complement pathways are involved in microglial-mediated forgetting.

Main Methods:

  • Observation of microglial engulfment of synaptic components in mouse hippocampi.
  • Depletion of microglia and inhibition of microglial phagocytosis.
  • Introduction of CD55 to inhibit complement pathways in engram cells.
  • Assessment of memory retention and engram cell dissociation.

Main Results:

  • Microglial engulfment of synaptic components was observed in healthy adult mice.
  • Depleting microglia or inhibiting their phagocytosis prevented memory forgetting.
  • Inhibition of complement pathways in engram cells also prevented forgetting.
  • Microglia were involved in both neurogenesis-related and unrelated memory degradation.

Conclusions:

  • Microglia eliminate synapses in a complement-dependent and activity-dependent manner, leading to memory forgetting.
  • Complement-dependent synapse elimination by microglia is a key mechanism for the forgetting of remote memories.
  • Targeting microglial activity and complement pathways may offer strategies to combat memory loss.