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From the Departments of Neurosciences (Drs. Assini, Vitali, Colucci, Giliberto, Borghi, Piccini, and Tabaton, and M.L. Inglese and S. Volpe) and Internal Medicine (Dr. Odetti), University of Genoa; and the Departments of Neurology (Drs. Cammarata and Ratto) and Human Genetics (Drs. Dagna-Bricarelli, Baldo, and Argusti), Galliera Hospital, Genoa, Italy.
Address correspondence and reprint requests to Dr. Massimo Tabaton, Department of Neurosciences, University of Genoa, Via De Toni 5, 16132 Genoa, Italy; e-mail: mtabaton{at}neurologia.unige.it
Background: Accumulation in the brain of small aggregates of amyloid ß-protein 42 (Aß42) is the major pathogenic event of Alzheimer disease (AD). In familial early-onset AD this event is likely the result of Aß42 overproduction; in the most common sporadic late-onset form of the disease the mechanisms of Aß42 accumulation are unknown.
Methods: To address this issue the authors analyzed plasma levels of Aß42 in 88 elderly patients with amnestic mild cognitive impairment (MCI), chosen as paradigm of preclinical sporadic AD.
Results: The authors found a significant increase of Aß42 plasma levels in women with MCI, in comparison to the affected men and 72 cognitively normal age-matched subjects. The levels were independent of variables in education, apolipoprotein E genotype, cholesterol, and creatinine plasma concentrations, as well as hemoglobin content.
Conclusions: The elevation of Aß42 plasma levels in women with MCI may represent a biologic explanation for the sex-dependent increased incidence of late-onset AD in women identified by epidemiologic studies.
Received January 7, 2004. Accepted in final form April 28, 2004.
*These authors contributed equally to the study.
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Neurology 2004 63: 766-767.
Correspondence:
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