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Manganese potentiates nitric oxide production by microglia
1Department of Anatomy, Slot 510, University of Arkansas for Medical Sciences, 4301 W. Markham St., Little Rock, AR 72205, USA.
Brain Research. Molecular Brain Research
|May 13, 1999
Summary
Manganese exposure activates immune cells in the brain, increasing neurotoxic nitric oxide production. This finding suggests a potential mechanism linking manganese toxicity to Parkinson
Area of Science:
- Neuroscience
- Toxicology
- Immunology
Background:
- Manganese toxicity presents neurotoxic symptoms mirroring Parkinson's disease.
- Reactive microglia are observed in the substantia nigra of Parkinson's patients.
Purpose of the Study:
- To investigate the association between high manganese levels and microglial activation.
- To determine manganese's effect on nitric oxide production in microglial cells.
Main Methods:
- Utilized N9 microglial cells for experimental analysis.
- Measured nitric oxide production and inducible nitric oxide synthase (iNOS) expression.
- Employed immunohistochemical staining, Western blot, and Northern blot analyses.
Main Results:
- Manganese significantly enhanced lipopolysaccharide-induced nitric oxide production in microglial cells.
- Manganese increased cellular and mRNA levels of inducible nitric oxide synthase (iNOS).
- Unlike other tested metals, manganese did not exhibit cytotoxicity to microglial cells.
Conclusions:
- Manganese induces sustained production of neurotoxic nitric oxide by activated microglia.
- This manganese-induced neuroinflammation may contribute to neuronal damage.
- Suggests a potential pathway for manganese neurotoxicity relevant to Parkinson's disease.