A synaptic strategy for consolidation of convergent visuotopic maps.

A synaptic strategy for consolidation of convergent visuotopic maps.
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DOI:
10.1016/j.neuron.2011.06.023
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发表时间:
2011-08-25
期刊:
影响因子:
16.2
通讯作者:
Constantine-Paton M
Constantine-Paton M
中科院分区:
医学1区
文献类型:
--
作者:
Phillips MA;Colonnese MT;Goldberg J;Lewis LD;Brown EN;Constantine-Paton M

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The mechanisms by which experience guides refinement of converging afferent pathways are poorly understood. We describe a vision-driven refinement of cortico-collicular inputs that determines the consolidation of retinal and visual cortical (VC) synapses on individual neurons in the superficial superior colliculus (sSC). Highly refined cortico-collicular terminals form 1-2d after eye-opening (EO), accompanied by VC-dependent filopodia sprouting on proximal dendrites, and PSD-95 and VC-dependent quadrupling of functional synapses. Delayed EO eliminates synapses, cortico-collicular terminals, and spines on VC-recipient dendrites. Awake recordings after eye-opening show that VC and retina cooperate to activate sSC neurons, and VC light responses precede sSC responses within intervals promoting potentiation. Eyelid closure is associated with more protracted cortical visual responses, causing the majority of VC spikes to follow those of the colliculus. These data implicate spike-timing plasticity as a mechanism for cortical input survival, and support a cooperative strategy for retinal and cortical co-innervation of the sSC. 150/150 words
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