alexa Microglia sculpt postnatal neural circuits in an activity and complement-dependent manner.
Reproductive Medicine

Reproductive Medicine

Clinics in Mother and Child Health

Author(s): Schafer DP, Lehrman EK, Kautzman AG, Koyama R, Mardinly AR,

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Abstract Microglia are the resident CNS immune cells and active surveyors of the extracellular environment. While past work has focused on the role of these cells during disease, recent imaging studies reveal dynamic interactions between microglia and synaptic elements in the healthy brain. Despite these intriguing observations, the precise function of microglia at remodeling synapses and the mechanisms that underlie microglia-synapse interactions remain elusive. In the current study, we demonstrate a role for microglia in activity-dependent synaptic pruning in the postnatal retinogeniculate system. We show that microglia engulf presynaptic inputs during peak retinogeniculate pruning and that engulfment is dependent upon neural activity and the microglia-specific phagocytic signaling pathway, complement receptor 3(CR3)/C3. Furthermore, disrupting microglia-specific CR3/C3 signaling resulted in sustained deficits in synaptic connectivity. These results define a role for microglia during postnatal development and identify underlying mechanisms by which microglia engulf and remodel developing synapses. Copyright © 2012 Elsevier Inc. All rights reserved.
This article was published in Neuron and referenced in Clinics in Mother and Child Health

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