Sensory Experience Engages Microglia to Shape Neural Connectivity through a Non-Phagocytic Mechanism.

Sensory Experience Engages Microglia to Shape Neural Connectivity through a Non-Phagocytic Mechanism.
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DOI:
10.1016/j.neuron.2020.08.002
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发表时间:
2020-11-11
期刊:
影响因子:
16.2
通讯作者:
Greenberg ME
Greenberg ME
中科院分区:
医学1区
文献类型:
--
作者:
Cheadle L;Rivera SA;Phelps JS;Ennis KA;Stevens B;Burkly LC;Lee WA;Greenberg ME

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Sensory experience remodels neural circuits in the early postnatal brain through mechanisms that remain to be elucidated. Applying a new method of ultrastructural analysis to the retinogeniculate circuit, we find that visual experience alters the number and structure of synapses between the retina and the thalamus. These changes require the vision-dependent transcription of the receptor Fn14 in thalamic relay neurons and the induction of its ligand TWEAK in microglia. Fn14 functions to increase the number of bulbous spine-associated synapses at retinogeniculate connections likely contributing to the strengthening of the circuit that occurs in response to visual experience. However, at retinogeniculate connections nearby TWEAK-expressing microglia, TWEAK signals via Fn14 to restrict the number of bulbous spines on relay neurons, leading to the elimination of a subset of connections. Thus, TWEAK and Fn14 represent an intercellular signaling axis through which microglia shape retinogeniculate connectivity in response to sensory experience. Sensory experience induces Fn14 expression in relay neurons and TWEAK expression in microglia to drive the refinement of retinogeniculate connectivity. Microglial TWEAK signals through neuronal Fn14 to eliminate a subset of synapses proximal to TWEAK-expressing microglia while Fn14 acts alone at other synapses to strengthen connectivity.
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