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Caspase-1 expression in multiple sclerosis plaques and cultured glial cells
Xue Ming1, Weiping Li, Yasuhiro Maeda
1Department of Neurosciences, UMDNJ-New Jersey Medical School, Newark, NJ, USA.
Journal of the Neurological Sciences
|May 9, 2002
Summary
Caspase-1 (an inflammatory enzyme) is elevated in multiple sclerosis (MS) brain tissue. This enzyme appears to contribute to oligodendrocyte death and inflammation in MS pathogenesis.
Area of Science:
- Neuroimmunology
- Cellular Biology
- Molecular Pathology
Background:
- Caspase-1 processes inflammatory cytokines and induces apoptosis.
- Multiple sclerosis (MS) involves neuroinflammation and oligodendrocyte damage.
Purpose of the Study:
- To investigate the role of caspase-1 in multiple sclerosis pathogenesis.
- To determine if caspase-1 is upregulated in MS lesions and contributes to oligodendrocyte death.
Main Methods:
- RT-PCR to quantify caspase-1 mRNA in MS brain tissue.
- Immunohistochemistry to localize caspase-1 protein expression.
- TUNEL assay for DNA fragmentation.
- Oligodendroglial cell line studies with caspase inhibitors and Western immunoblotting.
Main Results:
- Caspase-1 mRNA and protein were significantly upregulated in MS brain lesions, particularly in oligodendrocytes.
- Caspase-1 expression was observed in microglia, infiltrating cells, and within apoptotic bodies.
- In vitro, a caspase-1 inhibitor blocked cytokine-induced death in oligodendroglial cells more effectively than a caspase-3 inhibitor.
- Procaspase-1 levels decreased in dying oligodendroglia, suggesting caspase-1 activation.
Conclusions:
- Caspase-1 is upregulated in multiple sclerosis lesions and is present in dying oligodendrocytes.
- Caspase-1 activation may contribute to oligodendrocyte apoptosis and neuroinflammation in MS.
- Targeting caspase-1 could be a potential therapeutic strategy for multiple sclerosis.