Association between apolipoprotein E4 and cognitive decline in elderly adults

C.J. Packard, R.G.J. Westendorp, D.J. Stott, M.J. Caslake, H.M. Murray, J. Sheperd, G.J. Blauw, M.B. Murphy, E.L. Bollen, B.M. Buckley, S. Cobbe, I. Ford, A. Gaw, M. Hyland, J.W. Jukema, A.M. Kamper, P W. Macfarlane, J. Jolles, IJ. Perry, B.J. SweeneyC. Twomey

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Abstract

OBJECTIVE: To determine the influence of apolipoprotein E on cognitive decline in a cohort of elderly men and women. DESIGN: Prospective study. SETTING: Scotland, Ireland, and the Netherlands. PARTICIPANTS: Five thousand eight hundred four subjects aged 70 to 82 from the Prospective Study of Pravastatin in the Elderly at Risk (PROSPER). MEASUREMENTS: Subjects were assessed at baseline and over a mean 3.2-year (range 0.7-4.2) follow-up for memory (Picture-Word Recall), speed of information processing (Stroop and Letter-Digit Coding), global cognitive function (Mini-Mental State Examination), and activities of daily living. RESULTS: At baseline, subjects with apolipoprotein E-4 versus those without E-4 had poorer memory performance (mean score difference -0.20 (95% confidence interval (CI)=-0.31 to -0.09) for immediate recall and -0.32 (95% CI=-0.48 to -0.16) for delayed recall and slower information processing (difference in Stroop, 2.79 seconds, (95% CI=1.20-4.28); Letter-Digit score, -0.36, (95% CI=-0.77-0.05). Subjects with apolipoprotein E-4 showed a greater decline in immediate (-0.22, 95% CI=-0.33 to -0.11) and delayed (-0.30, 95% CI=-0.46 to -0.15) memory scores but no significant change in speed of information processing (Stroop, P=.17; Letter-Digit, P=.06). Memory scores decreased 2.5% from baseline in those without E-4, 4.3% in E-4 heterozygotes (P=.01 for immediate and P=.03 for delayed, vs no E-4) and 8.9% to 13.8% in E-4 homozygotes (P=.04 for immediate and P=.004 for delayed, vs heterozygotes). Apolipoprotein E-4 was associated with greater decline in instrumental activities of daily living (P
Original languageEnglish
Pages (from-to)1777-1785
JournalAmerican Journal of Geriatric Psychiatry
Volume55
Issue number11
DOIs
Publication statusPublished - 1 Jan 2007

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