A cluster of cholinergic premotor interneurons modulates mouse locomotor activity.

A cluster of cholinergic premotor interneurons modulates mouse locomotor activity.
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DOI:
10.1016/j.neuron.2009.10.017
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发表时间:
2009-12-10
期刊:
影响因子:
16.2
通讯作者:
Miles, Gareth B.
Miles, Gareth B.
中科院分区:
医学1区
文献类型:
--
作者:
Zagoraiou, Laskaro;Akay, Turgay;Martin, James F.;Brownstone, Robert M.;Jessell, Thomas M.;Miles, Gareth B.

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Mammalian motor programs are controlled by networks of spinal interneurons that set the rhythm and intensity of motor neuron firing. Motor neurons have long been known to receive prominent ‘C-bouton’ cholinergic inputs from spinal interneurons, but the source and function of these synaptic inputs have remained obscure. We show here that the transcription factor Pitx2 marks a small cluster of spinal cholinergic interneurons, V0C neurons, that represents the sole source of C-bouton inputs to motor neurons. The activity of these cholinergic interneurons is tightly phase-locked with motor neuron bursting during fictive locomotor activity, suggesting a role in the modulation of motor neuron firing frequency. Genetic inactivation of the output of these neurons impairs a locomotor task-dependent increase in motor neuron firing and muscle activation. Thus V0C interneurons represent a defined class of spinal cholinergic interneurons with an intrinsic neuromodulatory role in the control of locomotor behavior.
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