Abstract
Studies of spinal commissural neurons have provided substantial insight into the mechanisms that regulate axon guidance. Explants of embryonic spinal cords and isolated spinal commissural neurons have been important experimental tools for the identification and characterization of several guidance cues, including netrins, semaphorins, slits, sonic hedgehog, BMPs, and wnts. In this unit, protocols are provided for establishing these explant assays to assess the outgrowth and turning capacity of commissural axons. In addition, methods are included for preparing cultures highly enriched with embryonic commissural neurons, which have been used to probe the biochemical signaling mechanisms regulating axon guidance.
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