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Updated: Jul 12, 2026
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Published on: August 28, 2021
Proteomic identification of nitrated brain proteins in amnestic mild cognitive impairment: a regional study
Rukhsana Sultana1, Tanea Reed, Marzia Perluigi
1Department of Chemistry, University of Kentucky, Lexington, KY 40506, USA.
Abstract:
Oxidative stress is an imbalance between the level of antioxidants and oxidants in a cell. Oxidative stress has been shown in brain of subjects with mild cognitive impairment (MCI) as well Alzheimer's disease (AD). MCI is considered as a transition phase between control and AD. The focus of the current study was to identify nitrated proteins in the hippocampus and inferior parietal lobule (IPL) brain regions of subjects with amnestic MCI using proteomics. The identified nitrated proteins in MCI brain were compared to those previously reported to be nitrated and oxidatively modified in AD brain, a comparison that might provide an invaluable insight into the progression of the disease.
Insights
Oxidative stress impacts brain function in mild cognitive impairment (MCI). This study identified specific nitrated proteins in MCI brain regions, offering insights into disease progression toward Alzheimer's disease (AD).
Area of Science:
- Neuroscience
- Biochemistry
- Proteomics
Background:
- Oxidative stress, an imbalance of oxidants and antioxidants, is implicated in neurodegenerative diseases.
- Mild cognitive impairment (MCI) represents a transitional stage between normal cognition and Alzheimer's disease (AD).
- Previous research indicates oxidative stress in the brains of individuals with AD.
Purpose of the Study:
- To identify proteins modified by nitration in the hippocampus and inferior parietal lobule (IPL) of subjects with amnestic MCI.
- To compare these identified nitrated proteins with those previously found in AD brains.
- To gain insights into the molecular mechanisms underlying the progression from MCI to AD.
Main Methods:
- Proteomic analysis was employed to identify nitrated proteins.
- Samples were obtained from hippocampus and IPL brain regions of individuals diagnosed with amnestic MCI.
- Comparative analysis was performed against existing proteomic data from AD brains.
Main Results:
- Specific nitrated proteins were identified in the hippocampus and IPL of MCI subjects.
- A comparison revealed overlaps and differences in nitrated protein profiles between MCI and AD brains.
- These findings highlight specific molecular alterations occurring during MCI.
Conclusions:
- Protein nitration is a significant molecular event in the progression of mild cognitive impairment.
- The identified nitrated proteins in MCI may serve as potential biomarkers for disease progression.
- Understanding these changes provides critical insights into the early stages of neurodegeneration.
