SorCS2 binds progranulin and regulates motor axon outgrowth
Thomassen, P. B.; Salasova, A.; Login, H.; Beel, S.; Tranberg-Jensen, J.; Qvist, P.; Ovesen, P. L.; Nolte, S.; Nejsum, L.; Chao, M. V.; Dasen, J.; Van Damme, P.; Sorensen, K. K.; Oxvig, C.; Nykjaer, A.
Show abstract
Motor neuron development requires an orchestrated action of trophic factors and guidance cues for axons to reach their targets. Here, we identify SorCS2 as a novel receptor for progranulin (PGRN) that is required for motor axon outgrowth in zebrafish and mice. In both species motor neurons express SorCS2, and PGRN is produced in cells juxta-positioned the projecting axon, but in mice the neurons also co-express PGRN. In zebrafish, sorcs2 knockdown produces stunted and aberrantly branched motor axons, and in Sorcs2-/- mice, forelimb innervation and motor neuron regeneration are substantially perturbed; phenotypes also observed in fish and mice lacking PGRN. SorCS2 binds PGRN and while motor neuron cultures from wildtype mice respond to exogenous PGRN by axon outgrowth, knockout neurons are unresponsive. Remarkably, when co-expressed in the same cells, SorCS2 controls secretion of PGRN. We conclude that SorCS2 navigates motor neuron development and enables axon regeneration through binding of PGRN.
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