The Risk of Parkinson Disease Associated with Urate in a Community-Based Cohort of Older AdultsJain S.a, c · Ton T.G.e · Boudreau R.M.b · Yang M.b · Thacker E.L.f · Studenski S.d · Longstreth, Jr. W.T.e · Strotmeyer E.S.b · Newman A.B.b, d
aPittsburgh Institute for Neurodegenerative Diseases, bDepartment of Epidemiology, University of Pittsburgh Graduate School of Public Health, and cDepartment of Neurology, dUniversity of Pittsburgh School of Medicine, Pittsburgh, Pa., and Departments of eNeurology and fEpidemiology, University of Washington, Seattle, Wash., USA
Samay Jain, MD, MS
Department of Neurology, University of Pittsburgh Medical Center
3471 Fifth Ave., Suite 811
Pittsburgh, PA 15213-3232 (USA)
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Background/Aims: Studies suggest an inverse association between urate concentration and the risk of Parkinson disease (PD). We investigated this in the Cardiovascular Health Study in an elderly community-based cohort of adults. Methods: The association of baseline urate (µmol/l) and incident PD over 14 years was assessed with locally weighted scatterplot smoothing (LOESS) regression from which categories of low (<300 µmol/l), middle (300–500 µmol/l), and high (>500 µmol/l) urate ranges were derived. Multivariate logistic regression models assessed the risk of PD for each urate range. Linear and quadratic terms were tested when modeling the association between urate and the risk of PD. Results: Women had significantly lower urate concentrations than did men [316.8 µmol/l (SD 88.0) vs. 367.4 µmol/l (SD 87.7), p < 0.0001] and in women no associations between urate and PD risk were observed. In men, LOESS curves suggested a U-shaped or threshold effect between urate and PD risk. With the middle range as reference, the risk of developing PD was significantly increased for urate <300 µmol/l (OR 1.69, 95% CI 1.03–2.78) but not for urate >500 µmol/l (OR 1.55, 95% CI 0.72–3.32) in men. A negative linear term was significant for urate <500 µmol/l, and across the entire range a convex quadratic term was significant. Conclusions: Results suggest a more complex relationship than previously reported between urate levels and the risk of PD in men. Low urate concentrations were associated with a higher PD risk and high urate concentrations were not associated with a further decrease in PD risk.
© 2011 S. Karger AG, Basel
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