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Influence of Serotonin-Transporter-Linked Promoter Region Polymorphism on Platelet Activation in Geriatric Depression

OBJECTIVE: Depression has been associated with increased platelet activation. Variations in the serotonin-transporter-linked promoter region (5-HTTLPR) polymorphism may influence the degree of activation. The authors examined the association among depression, platelet activation, and 5-HTTLPR genotype. METHOD: Elderly subjects with (N=61) and without (N=12) major depression were assessed for cognitive impairment, cardiovascular disease, and two indices of platelet activation. The depressed subjects were genotyped for the 5-HTTLPR polymorphism. RESULTS: The depressed subjects were older, were more cognitively impaired, and had higher platelet factor 4 and ß-thromboglobulin levels; cardiovascular disease was minimal in both groups. In the depressed group, subjects with the 5-HTTLPR l/l genotype had significantly higher platelet factor 4 and ß-thromboglobulin levels. CONCLUSIONS: Platelet activation is increased in elderly depressed patients, especially those with the 5-HTTLPR l/l genotype. This finding suggests how genetic differences may influence cardiovascular mortality in depressed patients with ischemic heart disease.

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