Vascular endothelial growth factor has neurotrophic activity and stimulates axonal outgrowth, enhancing cell survival and Schwann cell proliferation in the peripheral nervous system.
Vascular endothelial growth factor (VEGF) is a mitogen for endothelial cells, and it promotes angiogenesis in vivo. Here we report that VEGF(165) has neurotrophic actions on cultured adult mouse superior cervical ganglia (SCG) and dorsal root ganglia (DRG), measured as axonal outgrowth. Maximal effect was observed at 10-50 ng/ml for SCG and 100 ng/ml for DRG. VEGF-induced axonal outgrowth was inhibited by the mitogen-activated protein kinase kinase inhibitor PD 98059 but not by the protein kinase inhibitor K252a. VEGF also increased survival of both neurons and satellite cells and the number of proliferating Schwann cells. Immunocytochemistry and immunoblotting revealed that VEGF was expressed in virtually all nerve cells in the SCG but only in a population of small-diameter (<35 micrometers) neurons representing approximately 30% of the neurons in DRG. Immunostaining showed that the VEGF receptor fetal liver kinase receptor (flk-1) was found on nerve cell bodies in DRG and to a lesser extent on neurons in SCG. Growth cones of regenerating axons from both types of ganglia exhibited flk-1 immunoreactivity, as did Schwann cells. We conclude that VEGF has both neurotrophic and mitogenic activity on cells in the peripheral nervous system.
Sondell
M
M
Department of Animal Physiology, University of Lund, S-223 62 Lund, Sweden.
Lundborg
G
G
Kanje
M
M
D000818:Animals; D001369:Axons / Q000187:drug effects / Q000502:physiology / Q000648:ultrastructure*; D002227:Carbazoles / Q000494:pharmacology; D002470:Cell Survival / Q000187:drug effects; D002478:Cells, Cultured; D016228:Endothelial Growth Factors / Q000494:pharmacology*; D004791:Enzyme Inhibitors / Q000494:pharmacology; D005419:Flavonoids / Q000494:pharmacology; D005727:Ganglia, Spinal / Q000166:cytology* / Q000502:physiology; D006801:Humans; D026121:Indole Alkaloids; D008222:Lymphokines / Q000494:pharmacology*; D008297:Male; D051379:Mice; D008815:Mice, Inbred Strains; D009414:Nerve Growth Factors / Q000494:pharmacology*; D047428:Protein Kinase Inhibitors; D011994:Recombinant Proteins / Q000494:pharmacology; D012583:Schwann Cells / Q000166:cytology* / Q000187:drug effects / Q000502:physiology; D017783:Superior Cervical Ganglion / Q000166:cytology* / Q000502:physiology; D013997:Time Factors; D042461:Vascular Endothelial Growth Factor A; D042442:Vascular Endothelial Growth Factors
D002227:Carbazoles; D016228:Endothelial Growth Factors; D004791:Enzyme Inhibitors; D005419:Flavonoids; D026121:Indole Alkaloids; D008222:Lymphokines; D009414:Nerve Growth Factors; D047428:Protein Kinase Inhibitors; D011994:Recombinant Proteins; C467484:VEGFA protein, human; D042461:Vascular Endothelial Growth Factor A; D042442:Vascular Endothelial Growth Factors; C049985:staurosporine aglycone; C093973:2-(2-amino-3-methoxyphenyl)-4H-1-benzopyran-4-one