Abstract
Head injury and APOE epsilon4 are risk factors for Alzheimer's disease (AD). We previously found that deposits of amyloid beta-protein (Abeta) occur in fatal head injury, more frequently in patients with APOE epsilon4. We postulated that Abeta deposits triggered by injury could, in survivors, lead to AD-like pathology later in life. Here, we compared Abeta deposits in 21 long term survivors of head injury (up to 20 years) with age and APOE genotype matched controls. In both groups Abeta deposits were more common among patients with APOE epsilon4. However, Abeta deposits were not more common among survivors of head injury than controls. The findings support previous studies associating APOE epsilon4 with deposition of Abeta. However pathogenetic mechanisms other than Abeta deposition may explain the association of head injury with AD.
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