Abstract
Neuronal growth cones are guided to their targets by attractive and repulsive guidance cues1. In mammals, netrin-1 is a bifunctional cue, attracting some axons and repelling others2,3,4,5. Deleted in colorectal cancer (Dcc) is a receptor for netrin-1 that mediates its chemoattractive effect on commissural axons6,7, but the signalling mechanisms that transduce this effect are poorly understood. Here we show that Dcc activates mitogen-activated protein kinase (MAPK) signalling, by means of extracellular signal-regulated kinase (ERK)-1 and -2, on netrin-1 binding in both transfected cells and commissural neurons. This activation is associated with recruitment of ERK-1/2 to a Dcc receptor complex. Inhibition of ERK-1/2 antagonizes netrin-dependent axon outgrowth and orientation. Thus, activation of MAPK signalling through Dcc contributes to netrin signalling in axon growth and guidance.
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Acknowledgements
We thank J. Pouyssegur for reagents and discussions; V. Fafeur and E. Bloch-Gallego for providing reagents; C. Guix for technical assistance; and S. Dazy for preliminary observations on ERK-1/2 activation. This work was supported by the Ligue Contre le Cancer and the ARC (P.M.). L.P. is supported by a post-doctoral fellowship from the Ligue Contre le Cancer. E.S. is an Associate and M.T.-L. an Investigator of the Howard Hughes Medical Institute.
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Forcet, C., Stein, E., Pays, L. et al. Netrin-1-mediated axon outgrowth requires deleted in colorectal cancer-dependent MAPK activation. Nature 417, 443–447 (2002). https://doi.org/10.1038/nature748
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DOI: https://doi.org/10.1038/nature748
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