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Advanced lipid peroxidation end-products in Alexander's disease
R J Castellani1, G Perry, P L Harris
1Department of Pathology, University of Maryland Medical Center, 22 South Greene Street, Baltimore, MD 21201, USA.
Brain Research
|June 6, 1998
Summary
Lipid peroxidation adducts, specifically 4-hydroxy-2-nonenal pyrrole adducts, are found in Rosenthal fibers (RF) in Alexander's disease. This suggests oxidative stress and protein modification are key to RF formation and disease pathogenesis.
Area of Science:
- Neuroscience
- Pathology
- Biochemistry
Background:
- Rosenthal fibers (RF) are intra-astrocytic inclusions characteristic of Alexander's disease.
- The exact pathogenesis, accumulation, and insolubility of RF remain largely unknown.
- Previous studies identified advanced Maillard reaction end products in RF.
Purpose of the Study:
- To investigate the role of lipid peroxidation in the formation of Rosenthal fibers.
- To examine the presence of 4-hydroxy-2-nonenal (4-HNE) pyrrole adducts in Alexander's disease RF.
Main Methods:
- Immunohistochemical analysis of three Alexander's disease cases.
- Utilized antibodies specific to lysine-derived pyrrole modification from 4-HNE.
- Compared findings with age-matched control cases.
Main Results:
- Strong immunolabeling of RF with 4-HNE pyrrole adduct antibodies in all Alexander's disease cases.
- No immunoreactivity observed in age-matched control cases.
- Indicates protein modification by lipid peroxidation adducts in RF.
Conclusions:
- Lipid peroxidation adducts are significantly involved in Rosenthal fiber formation.
- Post-translational modification, initiated by oxidative stress, is critical for RF accumulation and insolubility.
- These findings advance the understanding of Alexander's disease pathogenesis.