Abstract
Free radical-induced phototoxicity mediated by laser irradiation was investigated in the rabbit facial nerve. Azure-C, mesoporphyrin, or the dye conjugated to the protein carrier horseradish peroxidase were injected into the levator alae nasi muscle. Two to 7 days after uptake and laser exposure, nerve sections showed varying degrees of cellular modifications including: severe membrane degradation and associated lipid peroxide granules, distended mitochondria, and mitochondrial loss. Immunoblots of homogenates from treated nerves revealed specific changes in neurofilament and myelin basic protein. The site specific damage produced in vivo by photosensitizing dye resembles abnormalities in aging neurons and in Batten's disease, both hypothesized to be cases of free radical-peroxidation reactions. These reactions differ from those found in transection and crush lesions.
Original language | English (US) |
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Pages (from-to) | 122-128 |
Number of pages | 7 |
Journal | Brain research |
Volume | 534 |
Issue number | 1-2 |
DOIs | |
State | Published - Nov 26 1990 |
Externally published | Yes |
Keywords
- Axonal transport
- Facial nerve
- Free radical
- Laser
- Nerve degeneration
- Photosensitizing dye
- Phototoxicity
ASJC Scopus subject areas
- Developmental Biology
- Molecular Biology
- Clinical Neurology
- Neuroscience(all)