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Subdomain-mediated axon-axon signaling and chemoattraction cooperate to regulate afferent innervation of the lateral habenula

By Ewoud Roberto Eduard Schmidt, Sara Brignani, Youri Adolfs, Suzanne Lemstra, Jeroen Demmers, Marina Vidaki, Amber-Lee Skye Donahoo, Kersti Lillevali, Eero Vasar, Linda Jane Richards, Domna Karagogeos, Sharon Margriet Kolk and Ronald Jeroen Pasterkamp

Abstract

A dominant feature of neural circuitry is the organization of neuronal projections and synapses into specific brain nuclei or laminae. Lamina-specific connectivity is controlled by the selective expression of extracellular guidance and adhesion molecules in the target field. However, how (sub)nucleus-specific connections are established and whether axon-derived cues contribute to subdomain targeting are largely unknown. Here, we demonstrate that the lateral subnucleus of the habenula (lHb) determines its own afferent innervation by sending out efferent projections that express the cell adhesion molecule LAMP to reciprocally collect and guide dopaminergic afferents to the lHb-a phenomenon we term subdomain-mediated axon-axon signaling. This process of reciprocal axon-axon interactions cooperates with lHb-specific chemoattraction mediated by Netrin-1, which controls axon target entry, to ensure specific innervation of the lHb. We propose that cooperation between pretarget reciprocal axon-axon signaling and subdomain-restricted instructive cues provides a highly precise and general mechanism to establish subdomain-specific neural circuitry

Topics: General Neuroscience
Publisher: Cell Press
Year: 2014
OAI identifier: oai:espace.library.uq.edu.au:UQ:336055

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