Neuronal Ig/Caspr recognition promotes the formation of axoaxonic synapses in mouse spinal cord.

Neuronal Ig/Caspr recognition promotes the formation of axoaxonic synapses in mouse spinal cord.
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DOI:
10.1016/j.neuron.2013.10.060
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发表时间:
2014-01-08
期刊:
影响因子:
16.2
通讯作者:
Kaltschmidt JA
Kaltschmidt JA
中科院分区:
医学1区
文献类型:
--
作者:
Ashrafi S;Betley JN;Comer JD;Brenner-Morton S;Bar V;Shimoda Y;Watanabe K;Peles E;Jessell TM;Kaltschmidt JA

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Inhibitory microcircuits are wired with a precision that underlies their complex regulatory roles in neural information processing. In the spinal cord, one specialized class of GABAergic interneurons (GABApre) mediates presynaptic inhibitory control of sensory-motor synapses. The synaptic targeting of these GABAergic neurons exhibits an absolute dependence on proprioceptive sensory terminals, yet the molecular underpinnings of this specialized axoaxonic organization remain unclear. Here, we show that sensory expression of an NB2 (Contactin5)/Caspr4 coreceptor complex, together with spinal interneuron expression of NrCAM/CHL1, directs the high-density accumulation of GABAergic boutons on sensory terminals. Moreover, genetic elimination of NB2 results in a disproportionate stripping of inhibitory boutons from high-density GABApre-sensory synapses, suggesting that the preterminal axons of GABApre neurons compete for access to individual sensory terminals. Our findings define a recognition complex that contributes to the assembly and organization of a specialized GABAergic microcircuit. Sensory Ig/Caspr4 complex directs inhibitory synapse formation in mouse spinal cord Eliminating NB2 results in a reduced number of GABApre-sensory synapses Quantitative modeling suggests competition for formation of axoaxonic synapses Role for a contactin/Caspr complex in central synapse formation The mechanisms that confer synaptic specificity in mammalian circuits remain unclear. Ashrafi et al. describe a selective role for contactin-Caspr recognition in directing the formation of a presynaptic inhibitory microcircuit in the developing mouse spinal cord.
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