Axon Guidance and Neuronal Signaling

During the development of the nervous system, growing axons must navigate enormous distances through complex tissue to reach precise targets, guided by molecular signals that attract or repel them along the way. Proteins such as Netrins, Semaphorins, and Eph receptors act as the core vocabulary of this guidance language, binding to receptors on the axon's tip—the growth cone—to steer it through a series of intermediate waypoints. Getting these connections wrong has consequences not only for circuit formation but also for vascular patterning, since many of the same signaling pathways govern how blood vessels are laid out alongside nerves. Researchers are actively working out how growth cones integrate competing attractive and repulsive signals simultaneously, and how the same receptor can switch its response depending on the internal state of the neuron—questions with direct implications for regeneration after injury and for understanding developmental disorders.

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Keywords

Eph receptorsSemaphorinsNetrinsNeuronal polarityAxon guidanceCell signaling