Separate Microcircuit Modules of Distinct V2a Interneurons and Motoneurons Control the Speed of Locomotion

被引:140
作者
Ampatzis, Konstantinos [1 ]
Song, Jianren [1 ]
Ausborn, Jessica [1 ]
El Manira, Abdeljabbar [1 ]
机构
[1] Karolinska Inst, Dept Neurosci, S-17177 Stockholm, Sweden
基金
瑞典研究理事会;
关键词
EXCITATORY INTERNEURONS; SPINAL INTERNEURONS; ZEBRAFISH; CIRCUITS; NEURONS; RECRUITMENT; IDENTIFICATION; ORGANIZATION; GENERATION; LAMPREY;
D O I
10.1016/j.neuron.2014.07.018
中图分类号
Q189 [神经科学];
学科分类号
071006 [神经生物学];
摘要
Spinal circuits generate locomotion with variable speed as circumstances demand. These circuits have been assumed to convey equal and uniform excitation to all motoneurons whose input resistance dictates their activation sequence. However, the precise connectivity pattern between excitatory pre-motor circuits and the different motoneuron types has remained unclear. Here, we generate a connectivity map in adult zebrafish between the V2a excitatory interneurons and slow, intermediate, and fast motoneurons. We show that the locomotor network does not consist of a uniform circuit as previously assumed. Instead, it can be deconstructed into three separate microcircuit modules with distinct V2a interneuron subclasses driving slow, intermediate, or fast motoneurons. This modular design enables the increase of locomotor speed by sequentially adding microcircuit layers from slow to intermediate and fast. Thus, this principle of organization of vertebrate spinal circuits represents an intrinsic mechanism to increase the locomotor speed by incrementally engaging different motor units.
引用
收藏
页码:934 / 943
页数:10
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