Activity-induced remodeling of olfactory bulb microcircuits revealed by monosynaptic tracing.

Activity-induced remodeling of olfactory bulb microcircuits revealed by monosynaptic tracing.
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DOI:
10.1371/journal.pone.0029423
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发表时间:
2011
期刊:
影响因子:
3.7
通讯作者:
Ehlers MD
Ehlers MD
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Arenkiel BR;Hasegawa H;Yi JJ;Larsen RS;Wallace ML;Philpot BD;Wang F;Ehlers MD

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The continued addition of new neurons to mature olfactory circuits represents a remarkable mode of cellular and structural brain plasticity. However, the anatomical configuration of newly established circuits, the types and numbers of neurons that form new synaptic connections, and the effect of sensory experience on synaptic connectivity in the olfactory bulb remain poorly understood. Using in vivo electroporation and monosynaptic tracing, we show that postnatal-born granule cells form synaptic connections with centrifugal inputs and mitral/tufted cells in the mouse olfactory bulb. In addition, newly born granule cells receive extensive input from local inhibitory short axon cells, a poorly understood cell population. The connectivity of short axon cells shows clustered organization, and their synaptic input onto newborn granule cells dramatically and selectively expands with odor stimulation. Our findings suggest that sensory experience promotes the synaptic integration of new neurons into cell type-specific olfactory circuits.
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