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Astrocytic reactions in spinal gray matter following sciatic axotomy
S A Gilmore1, T J Sims, J E Leiting
1Department of Anatomy, University of Arkansas for Medical Sciences, Little Rock 72205-7199.
Glia
|January 1, 1990
Summary
Sciatic nerve injury rapidly activates spinal cord astrocytes, indicated by increased glial fibrillary acidic protein (GFAP). This response occurs in both dorsal and ventral gray matter, suggesting broader involvement beyond motor neuron reactions.
Area of Science:
- Neuroscience
- Cellular Biology
- Spinal Cord Injury Research
Background:
- Astrocytes play crucial roles in central nervous system homeostasis and injury response.
- Glial fibrillary acidic protein (GFAP) is a key marker for reactive astrocytes.
Purpose of the Study:
- To investigate astrocytic responses in the spinal cord gray matter following unilateral sciatic nerve axotomy.
- To characterize the temporal and spatial dynamics of glial fibrillary acidic protein (GFAP) immunoreactivity post-injury.
Main Methods:
- Unilateral sciatic nerve axotomy in animal models.
- Immunohistochemical analysis using an antiserum to glial fibrillary acidic protein (GFAP).
- Observation at intervals from 2 to 34 days post-axotomy.
Main Results:
- Increased GFAP-immunoreactive astrocytes were observed in the gray matter ipsilateral to the sciatic nerve axotomy.
- The astrocytic response was rapid, evident by day 2, and persisted throughout the 34-day observation period.
- GFAP-positive astrocytes were found in both ventral (motor neurons) and dorsal (dorsal root ganglion neuron processes) gray matter.
Conclusions:
- Astrocytic activation following sciatic nerve injury is a widespread phenomenon in the spinal cord gray matter.
- The rapid onset in the dorsal gray matter suggests mechanisms independent of transganglionic degeneration.
- The response involves astrocytes associated with both motor neurons and sensory afferents, indicating complex neural circuit involvement.