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[Platelet cytochrome c-oxidase and glutamine synthetase-like protein in patients with mild cognitive impairment]

G Sh Burbaeva, I S Boksha, O K Savushkina

    Zhurnal Nevrologii I Psikhiatrii Imeni S.S. Korsakova
    |June 9, 2012
    PubMed

    Insights

    Platelet enzymes cytochrome c-oxidase (COX) and glutamine synthetase-like protein (GSLP) show potential as early biomarkers for cognitive impairment. Lower COX activity and varying GSLP levels were observed in mild cognitive impairment and Alzheimer

    Area of Science:

    • Biochemistry
    • Neuroscience
    • Medical Diagnostics

    Background:

    • Alzheimer's disease (AD) diagnosis and treatment remain critical challenges.
    • Mild cognitive impairment (MCI) is a precursor stage to dementia.
    • Early detection of cognitive decline is essential for timely intervention.

    Purpose of the Study:

    • To investigate platelet enzyme activity and amounts as potential pre-clinical diagnostic markers for AD.
    • To explore the relationship between platelet enzymes and cognitive impairment severity in MCI and AD patients.
    • To assess the utility of cytochrome c-oxidase (COX) and glutamine synthetase-like protein (GSLP) as early markers.

    Main Methods:

    • Comparative study involving MCI patients (n=44), AD patients (n=42), and a healthy control group (n=24).
    • Measurement of platelet enzyme activity (COX) and protein levels (GSLP).
    • Correlation analysis between enzyme levels and cognitive function assessed by Mini-Mental State Examination (MMSE) scores.

    Main Results:

    • Significantly lower COX activity was found in both MCI and AD groups compared to controls (p=0.003).
    • Significant differences in GSLP levels were observed across the three groups (p=0.01).
    • A significant inverse correlation between GSLP levels and MMSE scores in the combined MCI+AD group (R=-0.43, p=0.007) was identified.

    Conclusions:

    • Platelet COX activity and GSLP levels may serve as early diagnostic markers for cognitive impairment.
    • These enzymes show promise for the pre-clinical diagnosis of Alzheimer's disease.
    • Further research could lead to the development of preventive therapies for MCI and AD.

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