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首页> 外文期刊>Neuron >Selective GABAergic control of higher-order thalamic relays.
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Selective GABAergic control of higher-order thalamic relays.

机译:高阶丘脑继电器的选择性GABA能控制。

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摘要

GABAergic signaling is central to the function of the thalamus and has been traditionally attributed primarily to the nucleus reticularis thalami (nRT). Here we present a GABAergic pathway, distinct from the nRT, that exerts a powerful inhibitory effect selectively in higher-order thalamic relays of the rat. Axons originating in the anterior pretectal nucleus (APT) innervated the proximal dendrites of relay cells via large GABAergic terminals with multiple release sites. Stimulation of the APT in an in vitro slice preparation revealed a GABA(A) receptor-mediated, monosynaptic IPSC in relay cells. Activation of presumed single APT fibers induced rebound burst firing in relay cells. Different APT neurons recorded in vivo displayed fast bursting, tonic, or rhythmic firing. Our data suggest that selective extrareticular GABAergic control of relay cell activity will result in effective, state-dependent gating of thalamocortical information transfer in higher-order but not in first-order relays.
机译:GABA能信号是丘脑功能的核心,传统上主要归因于网状丘脑(nRT)。在这里,我们提出了一种不同于nRT的GABA能途径,该途径选择性地在大鼠的高丘脑中枢传导中发挥强大的抑制作用。起源于前直肠前核(APT)的轴突通过具有多个释放位点的大型GABA能端,支配了中继细胞的近端树突。在体外切片制备中对APT的刺激揭示了中继细胞中GABA(A)受体介导的单突触IPSC。假定的单根APT纤维的激活在中继电池中引起回弹爆发。体内记录的不同APT神经元表现出快速爆发,强直或有节奏的放电。我们的数据表明,对继发细胞活性的选择性网状GABA能控制将导致高级别丘脑皮质信息传递的有效,状态依赖的门控,而在一阶中则不会。

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