Netrin-1-dependent Spinal Interneuron Subtypes Are Required for the Formation of Left-right Alternating Locomotor Circuitry

Overview

Journal J Neurosci

Specialty Neurology

Date 2009 Dec 18

PMID 20016078

Citations 38

Authors

Nadine Rabe

Henrik Gezelius

Anna Vallstedt

Fatima Memic

Klas Kullander

Affiliations

Soon will be listed here.

Abstract

Neuronal circuits in the spinal cord that produce the rhythmic and coordinated activities necessary for limb movements are referred to as locomotor central pattern generators (CPGs). The identities and preceding development of neurons essential for coordination between left and right limbs are not yet known. We show that the ventral floor plate chemoattractant Netrin-1 preferentially guides dorsally originating subtypes of commissural interneurons, the majority of which are inhibitory. In contrast, the excitatory and ventralmost V3 subtype of interneurons have a normal number of commissural fibers in Netrin-1 mutant mice, thus being entirely independent of Netrin-1-mediated attraction. This selective loss of commissural fibers in Netrin-1 mutant mice resulted in an abnormal circuitry manifested by a complete switch from alternating to synchronous fictive locomotor activity suggesting that the most ventral-originating excitatory commissural interneurons are an important component of a left-right synchrony circuit in the locomotor CPG. Thus, during development, Netrin-1 plays a critical role for the establishment of a functional balanced CPG.

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