Abstract
The effects of vascular factors on the nervous system are still poorly investigated. Angiopoietin-1 (Ang-1), an endothelial cell growth factor with influences on blood vessel stabilization, has been recently reported to prevent apoptosis in a neuroblastoma cell line via a pathway dependent on Tie-2 receptor. The present study focuses on the effect of Ang-1 on cultured dorsal root ganglion (DRG) cells isolated from 1-day-old rats. Three-day-old DRG cultures were exposed to Ang-1 treatment under serum-free condition for another 5 days and stained with antibodies against neurofilament (NF) 200 protein. Neurite length and density increased compared with those of controls. Double-immunofluorescence staining demonstrated the co-localization of the Tie-2 receptor in some NF-200-positive perikarya. The reverse transcription/polymerase chain reaction technique identified Tie-2 receptor mRNA in intact DRG and in Ang-1-stimulated DRG cell cultures, but not in a Schwann cell line or in primary astrocyte cultures. Western blotting confirmed that the expression of NF 68 protein in cultures treated with Ang-1 or nerve growth factor was higher than that in cultures treated with medium alone. When the Tie-2 receptor was blocked with anti-Tie-2 receptor antibody, neurite outgrowth was severely impeded. Induction of trkA-receptor protein expression was observed to be dependent on the presence of Tie-2 receptors. We conclude that Ang-1 promotes neurite outgrowth from DRG cells positive for Tie-2 receptor. The signalling pathway appears to involve transactivation of the trkA receptor.
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Acknowledgements
We deeply appreciate the technical skills of Claudia Merkwitz. This study was financially supported by the Deutsche Forschungsgemeinschaft, DFG, project no. Sp 232/7-1.
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This study was financially supported by the Deutsche Forschungsgemeinschaft (DFG), project no. Sp 232/7-1.
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Kosacka, J., Figiel, M., Engele, J. et al. Angiopoietin-1 promotes neurite outgrowth from dorsal root ganglion cells positive for Tie-2 receptor. Cell Tissue Res 320, 11–19 (2005). https://doi.org/10.1007/s00441-004-1068-2
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DOI: https://doi.org/10.1007/s00441-004-1068-2