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Serum Uric Acid Levels in Patients with Alzheimer's Disease: A Meta-Analysis

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  • Xueping Chen
  • Xiaoyan Guo
  • Rui Huang
  • Yongping Chen
  • Zhenzhen Zheng
  • Huifang Shang

Abstract

Background: Serum uric acid (UA) could exert neuro-protective effects against Alzheimer's disease (AD) via its antioxidant capacities. Many studies investigated serum UA levels in AD patients, but to date, results from these observational studies are conflicting. Methods: We conducted a meta-analysis to compare serum UA levels between AD patients and healthy controls by the random-effects model. Studies were identified by searching PubMed, ISI Web of Science, EMBASE, and the Cochrane library databases from 1966 through July 2013 using the Medical Subject Headings and keywords without restriction in languages. Only case-control studies were included if they had data on serum UA levels in AD patients and healthy controls. Begg's funnel plot and Egger's regression test were applied to assess the potential publication bias. Sensitivity analyses and meta-regression were conducted to explore possible explanations for heterogeneity. Results: A total of 11 studies met the inclusion criteria including 2708 participants were abstracted. Serum UA levels were not significantly different in AD patients compared to healthy controls (standardized mean difference (SMD) = −0.50; 95% confidence interval (CI): −1.23 to 0.22). Little evidence of publication bias was observed. Sensitivity analyses showed that the combined SMD was consistent every time omitting any one study, except only one study which greatly influenced the overall results. Meta-regression showed that year of publication, race, sample size, and mean age were not significant sources of heterogeneity. Conclusion: Our meta-analysis of case-control studies suggests that serum UA levels do not differ significantly in AD patients, but there may be a trend toward decreased UA in AD after an appropriate interpretation. More well-designed investigations are needed to demonstrate the potential change of serum UA levels in AD patients.

Suggested Citation

  • Xueping Chen & Xiaoyan Guo & Rui Huang & Yongping Chen & Zhenzhen Zheng & Huifang Shang, 2014. "Serum Uric Acid Levels in Patients with Alzheimer's Disease: A Meta-Analysis," PLOS ONE, Public Library of Science, vol. 9(4), pages 1-9, April.
    • Handle: RePEc:plo:pone00:0094084
    DOI: 10.1371/journal.pone.0094084
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    References listed on IDEAS

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    1. Qin Lv & Xian-Fang Meng & Fang-Fang He & Shan Chen & Hua Su & Jing Xiong & Pan Gao & Xiu-Juan Tian & Jian-She Liu & Zhong-Hua Zhu & Kai Huang & Chun Zhang, 2013. "High Serum Uric Acid and Increased Risk of Type 2 Diabetes: A Systemic Review and Meta-Analysis of Prospective Cohort Studies," PLOS ONE, Public Library of Science, vol. 8(2), pages 1-7, February.
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