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* Department of Pharmacology, New York University Medical Center, New York 10016; Receptor protein tyrosine phosphatase
SUGEN, Inc., Redwood City,
California 94063-4720; and § Becton Dickinson Research Center, Becton Dickinson and Company, P.O. Box 12016, Research
Triangle Park, North Carolina 27709-2016
(RPTP
) is expressed as soluble and receptor forms
with common extracellular regions consisting of a carbonic anhydrase domain (C), a fibronectin type III repeat (F), and a unique region called S. We showed previously that a recombinant Fc fusion protein with the
C domain (
C) binds to contactin and supports neuronal adhesion and neurite growth. As a substrate,
CFS was less effective in supporting cell adhesion, but
it was a more effective promoter of neurite outgrowth
than
CF.
S had no effect by itself, but it potentiated
neurite growth when mixed with
CF. Neurite outgrowth induced by
CFS was inhibited by antibodies
against Nr-CAM and contactin, and these cell adhesion molecules formed a complex that bound
CFS. NIH3T3 cells transfected to express
CFS on their surfaces
induced neuronal differentiation in culture. These results suggest that binding of glial RPTP
to the contactin/Nr-CAM complex is important for neurite growth and neuronal differentiation.
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