Abstract:
:Embryonic retinal ganglion cell (RGC) axons must extend toward and grow through the optic disc to exit the eye into the optic nerve. In the embryonic mouse eye, we found that immunoreactivity for the axon guidance molecule netrin-1 was specifically on neuroepithelial cells at the disk surrounding exiting RGC axons, and RGC axons express the netrin receptor, DCC (deleted in colorectal cancer). In vitro, anti-DCC antibodies reduced RGC neurite outgrowth responses to netrin-1. In netrin-1- and DCC-deficient embryos, RGC axon pathfinding to the disc was unaffected; however, axons failed to exit into the optic nerve, resulting in optic nerve hypoplasia. Thus, netrin-1 through DCC appears to guide RGC axons locally at the optic disc rather than at long range, apparently reflecting the localization of netrin-1 protein to the vicinity of netrin-1-producing cells at the optic disc.
journal_name
Neuronjournal_title
Neuronauthors
Deiner MS,Kennedy TE,Fazeli A,Serafini T,Tessier-Lavigne M,Sretavan DWdoi
10.1016/s0896-6273(00)80373-6subject
Has Abstractpub_date
1997-09-01 00:00:00pages
575-89issue
3eissn
0896-6273issn
1097-4199pii
S0896-6273(00)80373-6journal_volume
19pub_type
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