Relation of Coronary Atherosclerosis and Apolipoprotein E Genotypes in Alzheimer Patients

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Abstract
Background and Purpose Apolipoprotein E (apoE) ε4 allele has been associated with a high risk for coronary heart disease. Increased frequency of the ε4 allele has also been reported in patients with late-onset familial and sporadic Alzheimer’s disease (AD). The aim of this study was to investigate the degree of coronary and cerebral atherosclerosis in a neuropathologically verified series of AD patients with different apoE genotypes. In addition, we studied the relationship between the degree of coronary and cerebral atherosclerosis and the extent of β-amyloid (Aβ) accumulation. Methods We studied 38 subjects (32 patients with definite AD and 6 age-matched control subjects) for whom postmortem autopsy delay was less than 8 hours. ApoE genotypes were identified through Hha I digestion of the polymerase chain reaction–amplified samples. We used Aβ immunohistochemistry to detect diffuse and neuritic plaques as well as cerebrovascular amyloid. The degree of coronary and cerebral atherosclerosis was rated as none, mild, moderate, or severe. Results The apoE genotypes of the AD patients were ε4/4 2, ε3/4 19, ε3/3 9, and ε3/2 2. We found more severe atherosclerosis of the coronary vessels among AD patients with the apoE ε4 allele compared with those AD patients without the ε4 allele (χ 2 =4.1, df =1, P <.05). The extent of cerebral atherosclerosis did not differ among AD subgroups with and without the ε4 allele. The degree of coronary or cerebral atherosclerosis was not related to the amount of amyloid accumulation in the frontal and temporal cortices or in the hippocampal structures. Conclusions This study confirms the association of apoE ε4 allele with coronary atherosclerosis in AD patients.