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首页> 外文期刊>Neuron >Synaptic activation of metabotropic glutamate receptors regulates dendritic outputs of thalamic interneurons.
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Synaptic activation of metabotropic glutamate receptors regulates dendritic outputs of thalamic interneurons.

机译:代谢型谷氨酸受体的突触激活调节丘脑中神经元的树突状输出。

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摘要

Information gating through the thalamus is dependent on the output of thalamic relay neurons. These relay neurons receive convergent innervation from a number of sources, including GABA-containing interneurons that provide feed-forward inhibition. These interneurons are unique in that they have two distinct outputs: axonal and dendritic. In addition to conventional axonal outputs, these interneurons have presynaptic dendrites that may provide localized inhibitory influences. Our study indicates that synaptic activation of metabotropic glutamate receptors (mGluRs) increases inhibitory activity in relay neurons by increasing output of presynaptic dendrites of interneurons. Optic tract stimulation increases inhibitory activity in thalamic relay neurons in a frequency- and intensity-dependent manner and is attenuated by mGluR antagonists. Our data suggest that synaptic activation of mGluRs selectively alters dendritic output but not axonal output of thalamic interneurons. This mechanism could serve an important role in focal, feed-forward information processing in addition to dynamic information processing in thalamocortical circuits.
机译:通过丘脑的信息门控取决于丘脑中继神经元的输出。这些中继神经元从许多来源接受收敛的神经支配,包括提供前馈抑制作用的含GABA的中间神经元。这些中间神经元的独特之处在于它们具有两个不同的输出:轴突和树突。除常规的轴突输出外,这些中间神经元还具有突触前树突,可提供局部抑制作用。我们的研究表明,代谢型谷氨酸受体(mGluRs)的突触激活通过增加中间神经元突触前树突的输出而增加了中继神经元的抑制活性。视束刺激以频率和强度依赖性方式增加丘脑中继神经元的抑制活性,并被mGluR拮抗剂减弱。我们的数据表明,mGluRs的突触激活选择性地改变丘脑中间神经元的树突状输出,而不是轴突输出。除了在丘脑皮层回路中进行动态信息处理之外,该机制还可以在聚焦,前馈信息处理中发挥重要作用。

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