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Macroglial alterations after isolated optic nerve sheath fenestration in rabbit
Max Villain1, Françoise Sandillon, Agnès Muller
1Unité INSERM 336, Développement, Plasticité et Vieillissement du Système Nerveux Central, Montpellier, France. u336@univ-montp2.fr
Investigative Ophthalmology & Visual Science
|January 5, 2002
Summary
Surgical breach of optic nerve meninges in rabbits causes astrocyte reactivity and proliferation without axonal damage. This inflammation-induced astrocyte response may positively influence optic nerve axons and their environment.
Area of Science:
- Neuroscience
- Ophthalmology
- Cell Biology
Background:
- Optic nerve injury can lead to secondary damage.
- Understanding glial cell responses is crucial for neuroprotection.
Purpose of the Study:
- To investigate macroglial cell modifications following optic nerve meningeal breach in rabbits.
- To assess astrocyte reactivity and proliferation without inducing optic neuropathy.
Main Methods:
- Adapted human optic nerve sheath fenestration technique in rabbits, ensuring no axonal injury.
- Immunocytochemistry using glial fibrillary acidic protein (GFAP) and vimentin antibodies.
- Evaluated glial cell proliferation via 5-bromodeoxyuridine (BrdU) labeling and electron microscopy.
Main Results:
- Meningeal fenestration led to reduced subarachnoid space and increased optic nerve area.
- Hypertrophic astrocytes and numerous BrdU-labeled mitotic cells, including astrocyte lineage cells, were observed.
- No optic nerve axon loss was detected.
Conclusions:
- Surgical breach of optic nerve meninges induces significant astrocyte reactivity and proliferation.
- Reactive astrocytes may play a beneficial role in optic nerve axon health and extracellular environment modulation.