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EphA4 defines a class of excitatory locomotor-related interneurons

机译:EphA4定义了与兴奋性运动相关的中间神经元

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Relatively little is known about the interneurons that constitute the mammalian locomotor central pattern generator and how they interact to produce behavior. A potential avenue of research is to identify genetic markers specific to interneuron populations that will assist further exploration of the role of these cells in the network. One such marker is the EphA4 axon guidance receptor. EphA4-null mice display an abnormal rabbit-like hopping gait that is thought to be the result of synchronization of the normally alternating, bilateral locomotor network via aberrant crossed connections. In this study, we have performed whole-cell patch clamp on EphA4-positive interneurons in the flexor region (L2) of the locomotor network. We provide evidence that although EphA4 positive interneurons are not entirely a homogeneous population, most of them fire in a rhythmic manner. Moreover, a subset of these interneurons provide direct excitation to ipsilateral motor neurons as determined by spike-triggered averaging of the local ventral root DC trace. Our findings substantiate the role of EphA4-positive interneurons as significant components of the ipsilateral locomotor network and describe a group of putative excitatory central pattern generator neurons.
机译:关于构成哺乳动物运动中心模式发生器的中间神经元以及它们如何相互作用以产生行为的了解相对较少。一个潜在的研究途径是鉴定特定于中间神经元种群的遗传标记,这将有助于进一步探索这些细胞在网络中的作用。一种这样的标记是EphA4轴突导向受体。 EphA4无效的小鼠表现出异常的兔样跳跃步态,这被认为是正常交叉的双边运动网络通过异常交叉连接同步的结果。在这项研究中,我们对运动网络的屈肌区域(L2)中的EphA4阳性神经元进行了全细胞膜片钳。我们提供的证据表明,尽管EphA4阳性内部神经元并不完全是同质种群,但它们中大多数都以有节奏的方式发射。此外,这些中间神经元的一个子集提供了对同侧运动神经元的直接激励,这是通过局部腹侧根DC迹线的尖峰触发平均来确定的。我们的研究结果证实了EphA4阳性神经元作为同侧运动网络的重要组成部分的作用,并描述了一组假定的兴奋性中央模式发生器神经元。

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