Synaptic inhibition in the olfactory bulb accelerates odor discrimination in mice.
Synaptic inhibition in the olfactory bulb accelerates odor discrimination in mice.
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DOI:
10.1016/j.neuron.2010.01.009
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发表时间:
2010-02-11
期刊:
影响因子:
16.2
通讯作者:
Kuner T
中科院分区:
文献类型:
--
作者:
Abraham NM;Egger V;Shimshek DR;Renden R;Fukunaga I;Sprengel R;Seeburg PH;Klugmann M;Margrie TW;Schaefer AT;Kuner T
Local inhibitory circuits are thought to shape neuronal information processing in the central nervous system, but it remains unclear how specific properties of inhibitory neuronal interactions translate into behavioral performance. In the olfactory bulb, inhibition of mitral/tufted cells via granule cells may contribute to odor discrimination behavior by refining neuronal representations of odors. Here we show that selective deletion of the AMPA receptor subunit GluA2 in granule cells boosted synaptic Ca2+ influx, increasing inhibition of mitral cells. On a behavioral level, discrimination of similar odor mixtures was accelerated while leaving learning and memory unaffected. In contrast, selective removal of NMDA receptors in granule cells slowed discrimination of similar odors. Our results demonstrate that inhibition of mitral cells controlled by granule cell glutamate receptors results in fast and accurate discrimination of similar odors. Thus, spatio-temporally defined molecular perturbations of olfactory bulb granule cells directly link stimulus-similarity, neuronal processing time and discrimination behavior to synaptic inhibition.
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