Induction of neurite outgrowth through contactin and Nr-CAM by extracellular regions of glial receptor tyrosine phosphatase beta.
Receptor protein tyrosine phosphatase beta (RPTPbeta) 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 (beta C) binds to contactin and supports neuronal adhesion and neurite growth. As a substrate, betaCFS was less effective in supporting cell adhesion, but it was a more effective promoter of neurite outgrowth than betaCF. betaS had no effect by itself, but it potentiated neurite growth when mixed with betaCF. Neurite outgrowth induced by betaCFS was inhibited by antibodies against Nr-CAM and contactin, and these cell adhesion molecules formed a complex that bound betaCFS. NIH-3T3 cells transfected to express betaCFS on their surfaces induced neuronal differentiation in culture. These results suggest that binding of glial RPTPbeta to the contactin/Nr-CAM complex is important for neurite growth and neuronal differentiation.
Sakurai
T
T
Department of Pharmacology, New York University Medical Center 10016, USA.
Lustig
M
M
Nativ
M
M
Hemperly
J J
JJ
Schlessinger
J
J
Peles
E
E
Grumet
M
M
D000818:Animals; D019138:Antibodies, Blocking / Q000494:pharmacology; D002256:Carbonic Anhydrases / Q000502:physiology; D015815:Cell Adhesion Molecules; D015816:Cell Adhesion Molecules, Neuronal / Q000276:immunology / Q000378:metabolism / Q000494:pharmacology*; D002454:Cell Differentiation / Q000187:drug effects; D058966:Contactins; D005110:Extracellular Space / Q000201:enzymology / Q000502:physiology*; D005347:Fibroblasts / Q000378:metabolism / Q000502:physiology; D005353:Fibronectins / Q000502:physiology; D006801:Humans; D009419:Nerve Tissue Proteins / Q000378:metabolism / Q000494:pharmacology* / Q000502:physiology*; D016501:Neurites / Q000187:drug effects* / Q000201:enzymology / Q000502:physiology*; D009457:Neuroglia / Q000201:enzymology*; D009474:Neurons / Q000166:cytology; D017027:Protein Tyrosine Phosphatases / Q000378:metabolism / Q000502:physiology*; D054633:Receptor-Like Protein Tyrosine Phosphatases, Class 5
D019138:Antibodies, Blocking; D015815:Cell Adhesion Molecules; D015816:Cell Adhesion Molecules, Neuronal; D058966:Contactins; D005353:Fibronectins; C491152:NRCAM protein, human; D009419:Nerve Tissue Proteins; C516895:PTPRZ1 protein, human; D017027:Protein Tyrosine Phosphatases; D054633:Receptor-Like Protein Tyrosine Phosphatases, Class 5; D002256:Carbonic Anhydrases