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Neurology. 1995 Mar;45(3 Pt 1):555-7.

Synergistic effects of traumatic head injury and apolipoprotein-epsilon 4 in patients with Alzheimer's disease.

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  • 1Gertrude H. Sergievsky Center, Columbia University, New York, NY 10032.


The apolipoprotein-epsilon 4 allele increases the risk of Alzheimer's disease (AD), but cerebral deposition of beta-amyloid with age, a genetic mutation, or head injury may contribute to the pathogenesis of this disease. We examined the risks of AD associated with traumatic head injury and apolipoprotein-epsilon 4 in 236 community-dwelling elderly persons. A 10-fold increase in the risk of AD was associated with both apolipoprotein-epsilon 4 and a history of traumatic head injury, compared with a two-fold increase in risk with apolipoprotein-epsilon 4 alone. Head injury in the absence of an apolipoprotein-epsilon 4 allele did not increase risk. These data imply that the biological effects of head injury may increase the risk of AD, but only through a synergistic relationship with apolipoprotein-epsilon 4.

[PubMed - indexed for MEDLINE]
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