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Tyrosine phosphorylation in rat spinal cord after sciatic nerve transection
W A Eckert1, J G Valtschanoff, C A Otey
1Department of Physiology, University of North Carolina at Chapel Hill 27599.
Neuroreport
|June 2, 1994
Summary
Sciatic nerve injury in rats triggers increased tyrosine phosphorylation in spinal cord glial cells. This suggests a growth factor released by damaged nerves activates these cells, impacting nerve repair.
Area of Science:
- Neuroscience
- Cell Biology
- Biochemistry
Background:
- Sciatic nerve injury can lead to complex cellular responses in the central nervous system.
- Tyrosine phosphorylation is a key signaling mechanism in cellular responses to injury.
Purpose of the Study:
- To investigate changes in tyrosine phosphorylation in the rat spinal cord following sciatic nerve injury.
- To identify the cell types involved in these phosphorylation changes.
Main Methods:
- Immunocytochemistry using phosphotyrosine antibodies was performed on rat spinal cord tissue.
- Analysis focused on changes in immunostaining intensity and localization at various time points post-injury.
Main Results:
- Increased phosphotyrosine immunostaining was observed in the spinal gray matter, dorsal columns, and gracile nucleus ipsilateral to the sciatic nerve lesion.
- These changes were evident by 3 days and increased up to 3 weeks post-injury, most prominently in the L4 segment.
- Immunostaining was localized to astroglial cells and microglia in the dorsal horn and around motoneurons.
Conclusions:
- Sciatic nerve injury induces significant tyrosine phosphorylation in spinal cord glial cells.
- These changes are likely mediated by a diffusible growth factor released from the injured nerve.
- Receptor tyrosine kinases are implicated in mediating the glial response to nerve injury.