Cellular mechanisms of netrin function: Long-range and short-range actions

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Abstract
Netrins are secreted proteins that direct axon extension and cell migration during neural development. They are bifunctional cues that act as an attractant for some cell types and as a repellent for others. Several lines of evidence suggest that two classes of receptors, the deleted in colorectal cancer (DCC) family and the UNC-5 family, mediate the attractant and repellent response to netrin. Although netrins were first identified as diffusible long-range cues for developing axons, recent findings provide evidence that they also function as short-range cues close to the surface of the cells that produce them. This short-range function of netrin contributes to guiding neurite outgrowth and mediating cell-cell interactions during development and perhaps also in adults.

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