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Published 20 August 2001. doi:10.1083/jcb.200105019
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© The Rockefeller University Press, 0021-9525/2001/8/867 $5.00
The Journal of Cell Biology, Volume 154, Number 4, August 20, 2001 867-878

Article

CRYP-2/cPTPRO is a neurite inhibitory repulsive guidance cue for retinal neurons in vitro



Laurie Stepanek2, Qi Lun Sun1, Jun Wang1, Cong Wang1 and John L. Bixby1,2

1 Department of Molecular and Cellular Pharmacology, University of Miami School of Medicine, Miami, FL 33136
2 Neuroscience Program, University of Miami School of Medicine, Miami, FL 33136

Address correspondence to John Bixby, Dept. of Molecular and Cellular Pharmacology and Neuroscience Program, University of Miami School of Medicine, 1600 NW 10 Ave., R-189, Miami, FL 33136. Tel.: (305) 243-4875. Fax: (305) 243-2970. E-mail: jbixby{at}miami.edu

Receptor protein tyrosine phosphatases (RPTPs) are implicated as regulators of axon growth and guidance. Genetic deletions in the fly have shown that type III RPTPs are important in axon pathfinding, but nothing is known about their function on a cellular level. Previous experiments in our lab have identified a type III RPTP, CRYP-2/cPTPRO, specifically expressed during the period of axon outgrowth in the chick brain; cPTPRO is expressed in the axons and growth cones of retinal and tectal projection neurons. We constructed a fusion protein containing the extracellular domain of cPTPRO fused to the Fc portion of mouse immunoglobulin G-1, and used it to perform in vitro functional assays. We found that the extracellular domain of cPTPRO is an antiadhesive, neurite inhibitory molecule for retinal neurons. In addition, cPTPRO had potent growth cone collapsing activity in vitro, and locally applied gradients of cPTPRO repelled growing retinal axons. This chemorepulsive effect could be regulated by the level of cGMP in the growth cone. Immunohistochemical examination of the retina indicated that cPTPRO has at least one heterophilic binding partner in the retina. Taken together, our results indicate that cPTPRO may act as a guidance cue for retinal ganglion cells during vertebrate development.

Key Words: tyrosine phosphorylation; axon growth; chemorepulsion; growth cone; chick embryo


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