Evaluation of Markers of Oxidative Stress, Antioxidant Function and Astrocytic Proliferation in the Striatum and Frontal Cortex of Parkinson’s Disease Brains
Abstract
Dopaminergic neurons die in Parkinson’s disease (PD) due to oxidative stress and mitochondrial dysfunction in the substantia nigra (SN). We evaluated if oxidative stress occurs in other brain regions like the caudate nucleus (CD), putamen (Put) and frontal cortex (FC) in human postmortem PD brains (n = 6). While protein oxidation was elevated only in CD (P < 0.05), lipid peroxidation was increased only in FC (P < 0.05) and protein nitration was unchanged in PD compared to controls. Interestingly, mitochondrial complex I (CI) activity was unaffected in PD compared to controls. There was a 3–5 fold increase in the total glutathione (GSH) levels in the three regions (P < 0.01 in FC and CD; P < 0.05 in Put) but activities of antioxidant enzymes catalase, superoxide dismutase, glutathione reductase and glutathione-s-tranferase were not increased. Total GSH levels were elevated in these areas because of decreased activity of gamma glutamyl transpeptidase (γ-GT) (P < 0.05) activity suggesting a decreased breakdown of GSH. There was an increase in expression of glial fibrillary acidic protein (GFAP) (P < 0.001 in FC; P < 0.05 in CD) and glutathione peroxidase (P < 0.05 in CD and Put) activity due to proliferation of astrocytes. We suggest that increased GSH and astrocytic proliferation protects non-SN brain regions from oxidative and mitochondrial damage in PD.
Keywords
Parkinson’s disease Protein oxidation Protein nitration Glutathione Glial fibrillary acidic protein Frontal cortex Caudate nucleus PutamenAbbreviations
- PD
Parkinson’s disease
- AD
Alzheimer’s disease
- SN
Substantia nigra
- CI
Mitochondrial complex I
- ROS
Reactive oxygen species
- GSH
Glutathione reduced
- PMI
Postmortem interval
- FC
Frontal cortex
- CD
Caudate nucleus
- Put
Putamen
- SN
Substantia Nigra
- 3-NT
3-nitrotyrosine
- GFAP
Glial Fibrillary acidic protein
- SOD
Superoxide dismutase
- GST
Glutathione-s-transferase
- GR
Glutathione reductase
- γ-GCL
Gamma glutamyl cysteine ligase
- γGT
Gamma glutamyl transpeptidase
- GPx
Glutathione peroxidase
Notes
Acknowledgments
This work was financially supported by the Department of Science and Technology (DST) (fast-track grant no.SR/FT/L-152/2005), India and Indian Council of Medical Research (ICMR IRIS ID No. 2009-07710), India, both to MMSB. RM was supported by a senior research fellowship from Council of Scientific and Industrial Research (CSIR), India. GH is a senior research fellow of ICMR, India. We thank all the donors and their relatives for donating human brain tissue samples for this study. Human brain tissue for the study is sourced from Human Brain Tissue Repository for Neurobiological Studies (A National Research Facility), Department of Neuropathology, NIMHANS, Bangalore 560 029.
Supplementary material
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