Axon Guidance and Neuronal Signaling

During embryonic development, each neuron must extend a slender projection called an axon across considerable distances and connect it to precisely the right target cell — a feat of biological navigation that depends on a suite of molecular signals including Eph receptors, Semaphorins, and Netrins. These guidance cues act like a molecular GPS, attracting or repelling the growth cone at the axon's tip through cascades of intracellular signaling that reshape the cytoskeleton in real time. Researchers are now working to understand how growth cones integrate multiple, often competing signals simultaneously, and how the same molecular machinery that wires the nervous system also governs the patterning of blood vessels. A central open question is how disruptions to these pathways contribute to neurodevelopmental disorders and whether manipulating guidance signals could one day support nerve regeneration after injury.

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Keywords

Eph receptorsSemaphorinsNetrinsNeuronal polarityAxon guidanceCell signaling