首页> 外文期刊>Neuron >The GABAB1b isoform mediates long-lasting inhibition of dendritic Ca2+ spikes in layer 5 somatosensory pyramidal neurons.
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The GABAB1b isoform mediates long-lasting inhibition of dendritic Ca2+ spikes in layer 5 somatosensory pyramidal neurons.

机译:GABA B1b亚型介导5层体感锥体神经元中树突状Ca2 +尖峰的持久抑制。

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The apical tuft of layer 5 pyramidal neurons is innervated by a large number of inhibitory inputs with unknown functions. Here, we studied the functional consequences and underlying molecular mechanisms of apical inhibition on dendritic spike activity. Extracellular stimulation of layer 1, during blockade of glutamatergic transmission, inhibited the dendritic Ca2+ spike for up to 400 ms. Activation of metabotropic GABAB receptors was responsible for a gradual and long-lasting inhibitory effect, whereas GABAA receptors mediated a short-lasting (approximately 150 ms) inhibition. Our results suggest that the mechanism underlying the GABAB inhibition of Ca2+ spikes involves direct blockade of dendritic Ca2+ channels. By using knockout mice for the two predominant GABAB1 isoforms, GABAB1a and GABAB1b, we showed that postsynaptic inhibition of Ca2+ spikes is mediated by GABAB1b, whereas presynaptic inhibition of GABA release is mediated by GABAB1a. We conclude that the molecular subtypes of GABAB receptors play strategically different physiological roles in neocortical neurons.
机译:第5层锥体神经元的顶端簇被大量功能未知的抑制性输入所支配。在这里,我们研究了顶突抑制树突棘活动的功能后果和潜在的分子机制。在阻断谷氨酸能传递期间,第1层的细胞外刺激可抑制树突状Ca2 +尖峰长达400毫秒。促代谢型GABA B受体的激活是渐进和持久的抑制作用,而GABA A受体介导了短时(约150 ms)抑制作用。我们的结果表明,GABA B抑制Ca2 +峰值的机制涉及直接阻断树突状Ca2 +通道。通过使用敲除小鼠的两个主要的GABAB1亚型,GABAB1a和GABAB1b,我们表明,Ca2 +突触的突触后抑制是由GABAB1b介导的,而突触前对GABA释放的抑制是由GABAB1a介导的。我们得出结论,GABA B受体的分子亚型在新皮层神经元中发挥战略性的不同生理作用。

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