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Neuroscience. 2008 Dec 2;157(3):621-36. doi: 10.1016/j.neuroscience.2008.09.031. Epub 2008 Oct 1.

Graded expression of netrin-1 by specific neuronal subtypes in the adult mammalian striatum.

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1
Centre for Neuronal Survival, Montreal Neurological Institute, McGill University, 3801 University Avenue, Montreal, Quebec, Canada H3A 2B4.

Abstract

Netrins are a family of secreted proteins that function as axon guidance cues during neural development. High levels of netrin-1 expressed by the embryonic ganglionic eminence, the precursor of the adult striatum, direct axons that pioneer the internal capsule. Here we describe netrin-1 expression by neurons distributed throughout the striatum of the adult mouse. Differences were detected in the number and type of neurons expressing netrin-1 in different regions of the striatum. Most neurons in the ventral striatum, including projection neurons and cholinergic interneurons, express netrin-1. In contrast, netrin-1 expression is largely limited to cholinergic interneurons in the dorsal striatum, and the proportion of cholinergic interneurons that express netrin-1 decreases along rostral-caudal and ventral-dorsal axes. Regional differences in expression in the adult striatum suggest that netrin-1 not only influences the development of striatal circuitry but may also participate in the maintenance and plasticity of connections in the adult brain.

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