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Plasma levels of beta-amyloid(1-40), beta-amyloid(1-42), and total beta-amyloid remain unaffected in adult patients with hypercholesterolemia after treatment with statins.

BACKGROUND
Epidemiological studies suggest that statins reduce the risk of developing Alzheimer disease. Cell and animal experiments have revealed a connection between cholesterol metabolism and the processing of amyloid precursor protein. To our knowledge, the mechanism for statins in risk reduction of Alzheimer disease is unknown.


OBJECTIVE
To test the effect of statin treatment on beta-amyloid (A beta) metabolism in humans.


DESIGN
A prospective, randomized, dose-finding 36-week treatment trial with statins. Plasma samples were taken at baseline (week 0) and at weeks 6, 12, and 36.


SETTING
Outpatient clinical study at a university hospital.


PATIENTS
Thirty-nine patients who met the criteria for hypercholesterolemia.


INTERVENTIONS
Patients were randomized to oral treatment with either simvastatin or atorvastatin calcium according to the following regimen: simvastatin, 40 mg/d, or atorvastatin, 20 mg/d, for 6 weeks; followed by simvastatin, 80 mg/d, or atorvastatin, 40 mg/d, for 6 weeks; and finally, simvastatin, 80 mg/d, or atorvastatin, 80 mg/d, for 24 weeks.


MAIN OUTCOME MEASURES
Plasma levels of A beta(1-40) and A beta(1-42) were measured using 2 enzyme-linked immunosorbent assays, and total A beta was quantified by Western blotting.


RESULTS
Treatment with both statins reduced total plasma cholesterol levels by 56% (P =.00). The plasma levels of A beta(1-40), A beta(1-42), and total A beta were stable in individual patients during the treatment period. No significant change in the level of A beta(1-40), A beta(1-42), or total A beta was found.


CONCLUSION
This study questions the effect of statins on the processing of amyloid precursor protein in humans.