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High cholesterol affects platelet APP processing in controls and in AD patients
Barbara Borroni1, Francesca Colciaghi, Gian Luigi Lenzi
1Department of Neurology, Clinica Neurologica, c/o Spedali Civili di Brescia, University of Brescia, Brescia, Italy.
Neurobiology of Aging
|July 30, 2003
Summary
High cholesterol levels in Alzheimer disease (AD) patients are linked to altered platelet Amyloid Precursor Protein ratio (APPr), suggesting cholesterol impacts AD progression. This finding highlights cholesterol
Area of Science:
- Neuroscience
- Biochemistry
- Gerontology
Background:
- Alzheimer disease (AD) is characterized by a reduced platelet Amyloid Precursor Protein ratio (APPr), correlating with symptom severity.
- Emerging evidence suggests cholesterol's role in AD pathophysiology, potentially by influencing amyloid-beta (Abeta) production.
Purpose of the Study:
- To investigate the association between serum cholesterol levels and platelet APP processing in AD patients and controls.
- To determine if cholesterol affects APP processing independently of AD severity.
Main Methods:
- Recruited 60 AD patients and 45 age-matched controls (CTRL).
- Conducted neuropsychological assessments, serum cholesterol measurements, and platelet APP form evaluations.
- Compared APPr scores between hypercholesterolemic and normocholesterolemic AD patients.
Main Results:
- Controls exhibited lower serum cholesterol and higher APPr scores than AD patients.
- Hypercholesterolemic AD patients had significantly lower APPr scores than normocholesterolemic AD patients, even in early disease stages.
- Cholesterol levels influenced APPr in AD independently of disease severity.
Conclusions:
- Confirms a significant association between cholesterol levels and Alzheimer disease.
- Suggests that elevated cholesterol in vivo interferes with APP processing and maturation in AD.
- Highlights cholesterol as a potential factor in AD pathogenesis and a target for future research.