Abstract
Serum uric acid (sUA) level may be associated with cognitive impairment/dementia. It is possible this relationship varies with dementia subtype, particularly between vascular dementias (VaD) and Alzheimer’s (AD) or Parkinson’s disease (PDD)-related dementia. We aimed to present a synthesis of all published data on sUA and relationship with dementia/cognition through systematic review and meta-analysis. We included studies that assessed the association between sUA and any measure of cognitive function or a clinical diagnosis of dementia. We pre-defined subgroup analyses for patients with AD, VaD, PDD, mild cognitive impairment (MCI), and mixed or undifferentiated. We assessed risk of bias/generalizability, and where data allowed, we performed meta-analysis to describe pooled measures of association across studies. From 4811 titles, 46 papers (n = 16,688 participants) met our selection criteria. Compared to controls, sUA was lower in dementia (SDM −0.33 (95%CI)). There were differences in association by dementia type with apparent association for AD (SDM −0.33 (95%CI)) and PDD (SDM −0.67 (95%CI)) but not in cases of mixed dementia (SDM 0.19 (95%CI)) or VaD (SDM −0.05 (95%CI)). There was no correlation between scores on Mini-Mental State Examination and sUA level (summary r 0.08, p = 0.27), except in patients with PDD (r 0.16, p = 0.003). Our conclusions are limited by clinical heterogeneity and risk of bias in studies. Accepting this caveat, the relationship between sUA and dementia/cognitive impairment is not consistent across all dementia groups and in particular may differ in patients with VaD compared to other dementia subtypes.


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References
Afsar B, Elsurer R, Covic A et al (2011) Relationship between uric acid and subtle cognitive dysfunction in chronic kidney disease. Am J Nephrol 34:49–54
Ahlskog JE, Uitti RJ, Low PA et al (1995) No evidence for systemic oxidant stress in Parkinson’s or Alzheimer’s disease. Mov Disord 10(5):566–573
Annanmaki T, Pessala-Driver A, Hokkanen L et al (2008) Uric acid associates with cognition in Parkinson’s disease. Parkinsonism Relat Disord 14:576–578
Annanmaki T, Pohja M, Parviainn T et al (2011) Uric acid and cognition in Parkinson’s disease: a follow-up study. Parkinsonism Relat Disord 17:333–337
Ascherio A, LeWitt PA, Xu K (2009) Urate as a predictor of the rate of clinical decline in Parkinson disease. Arch Neurol 66 (12)
Baldieras I, Santana I, Proenca MT et al (2008) Peripheral oxidative damage in mild cognitive impairment and mild Alzheimer’s disease. J Alzheimers Dis 15:117–128
Bowman GL, Shannon J, Frei B (2010) Uric acid as a CNS antioxidant. J Alzheimers Dis 19(4):1331–1336. doi:10.3233/JAD-2010-1330
Can M, Varlibas F, Guven B (2013) Ischemia modified albumin and plasma oxidative stress markers in Alzheimer’s disease. Eur Neurol 69:377–380
Cankurtaran M, Yesil Y, Kuyumcu ME et al (2013) Altered levels of homocysteine and serum natural antioxidants links oxidative damage to Alzheimer’s disease. J Alzheimers Dis 33(4):1051–1058. doi:10.3233/JAD-2012-121630
Cascalheira JF, Joao SS, Pinhancos SS (2009) Serum homocysteine: interplay with other circulating and genetic factors in association to Alzheimer’s type dementia. Clin Biochem 42:783–790
Cervelatti C, Cremonini E, Bosi C (2013) Systemic oxidative stress in older patients with mild cognitive impairment or late onset Alzheimer’s disease. Curr Alzheimer Res 10:000–000
Choi HK, Atkinson K, Karlson EW, Willett W, Curhan G (2004) Purine-rich foods, dairy and protein intake, and the risk of gout in men. N Engl J Med 350:1093–1103
Cicero AF, Desideri G, Grossi G (2014) Serum uric acid and impaired cognitive function in a cohort of healthy young elderly: data from the Brisighella study. Intern Emerg Med
Dawson J, Walters M (2006) Uric acid and xanthine oxidase: future therapeutic targets in the prevention of cardiovascular disease? Br J Clin Pharmacol 62:633–644
Euser SM, Hofman A, Westendrop RGJ (2009) Serum uric acid and cognitive function and dementia. Brain 132:377–382
Folstein MF, Fosltein SE, McHugh PR (1975) “Mini-mental state”. A practical method for grading the cognitive state of patients for the clinician. J Psychiatr Res 12(3):189–198
Foy CJ, Passmore AP, Vahidassr MD et al (1999) Plasma chain-breaking antioxidants in Alzheimer’s disease, vascular dementia and Parkinson’s disease. Q J Med 92:39–45
Gackowski D, Rozalski R, Siomek A (2008) Oxidative stress and oxidative DNA damage is characteristic for mixed Alzheimer disease/vascular dementia. J Neurol Sci 266:57–62
González-Aramburu I, Sánchez-Juan P, Sierra M (2014) Serum uric acid and risk of dementia in Parkinson’s disease. Parkinsonism Relat Disord 20(6):637–639
Hemingway H, Croft P, Perel P (2013) Prognosis research strategy (PROGRESS) 1: a framework for researching clinical outcomes. BMJ 346:e5595
Higgin JPT, Altman DB, Sterne JAC (2011) Chapter 8: assessing risk of bias in included studies. Cochrane Handbook for Systematic Reviews of Interventions. Version 5.1.0 Updated March
Irizarry MC, Raman R, Schwarzschild MA (2009) Plasma urate and progression of mild cognitive impairment. Neurodegener Dis 6:23–28
Iuliano L, Monticolo R, Straface G (2010) Vitamin E and enzymatic/oxidative stress-driven oxysterols in amnestic mild cognitive impairment subtypes and Alzheimer’s disease. J Alzheimers Dis 21:1383–1392
Kasa M, Bierma TJ, Waterstraat F Jr et al (1989) Routine blood chemistry screen: a diagnostic aid for Alzheimer’s disease. Neuroepidemiology 8(5):254–261
Kim TS, Pae CU, Yun SJ (2006) Decreased plasma antioxidants in patients with Alzheimer’s disease. Int J Geriatr Psychiatry 21:344–348
Li J, Dong BR, Lin P (2010) Association of cognitive function with serum uric acid level among Chinese nonagenarians and centenarians. Exp Gerontol 45(5):331–335
Li W, Zhao P, Zhao X-J, Li Z-K (2012) Clinic Focus 27:1508–1509
Madan P, Kalra OP, Agarwal S et al (2007) Cognitive impairment in chronic kidney disease. Nephrol Dial Transplant 22:440–444
Maesaka JK, Wolf-Klein G, Piccione JM et al (1993) Hypouricemia, abnormal renal tubular urate transport, and plasma natriuretic factor(s) in patients with Alzheimer's disease. J Am Geriatr Soc 41(5):501–506
Maetzler W, Stapf AK, Schulte C et al (2011) Serum and cerebrospinal fluid uric acid levels in Lewy body disorders: associations with disease occurrence and amyloid-B pathway. J Alzheimers Dis 27:119–126
Matsubayashi K, Matsumoto M, Kawamoto A et al (1988) Hematocrit, serum lipids and cardiovascular indices as risk factors in vascular dementia. Jpn J Geriatr 25:576–580
Moccia M, Piccilo M, Erro R et al (2014) I s serum uric acid related to non-motor symptoms in de-novo Parkinson’s disease patients? Parkinsonism Relat Disord 20(7):772–775. doi:10.1016/j.parkreldis.2014.03.016
Pan M, Gao H, Long L et al (2013) Serum uric acid in patients with Parkinson’s disease and vascular parkinsonism: a cross-sectional stud. Neuroimmunomodulation 20:19–28
Polidori MC, Meococci P (2002) Plasma susceptibility to free radical-induced al1tioxidant consumptiol1 and lipid peroxidation is increased in very old subjects with Alzheimer disease. J Alzheimers Dis 4(6):517–522
Polidori MC, Mattioli P, Aldred S (2004) Plasma antioxidant status, immunoglobulin g oxidation and lipid peroxidation in demented patients: relevance to Alzheimer disease and vascular dementia. Dement Geriatr Cogn Disord 18(3-4):265–270
Pulido R, Jimenez-Escrig A, Orensanz L et al (2005) Study of plasma antioxidant status in Alzheimer’s disease. Eur J Neurol 12:531–535
Qin JB, Yang MH (2009) Clin Focus 24:57–58
Reyes AJ (2003) Cardiovascular drugs and serum uric acid. Cardiovasc Drugs Ther 17:397–414
Rinaldi P, Polidori MC, Metastasio X et al (2003) Plasma antioxidants are similarly depleted in mild cognitive impairment and in Alzheimer’s disease. Neurobiol Aging 24:915–919
Ruggiero Cherubini A, Lauretani F et al (2009) Uric acid and dementia in community-dwelling older persons. Dement Geriatr Cogn Disord 27:382–389
Schretlen DJ, Inscore AB, Vannorsdall TD et al (2007) Serum uric acid and brain ischemia in normal elderly adults. Neurology 69:1418–1423
Shang X, Zhang F, Meng L et al (2009) Relationship between the level of serum uric acid and alzheimer’s disease. J China Med Univ 38(5)
Stroup DF, Berlin JA, Morton SC et al (2000) Meta-analysis of observational studies in epidemiology: a proposal for reporting. JAMA 283:2008–2012
Tohgi H, Abe T, Takahashi S et al (1993) The urate and xanthine concentrations in the cerebrospinal fluid in patients with vascular dementia of the Binswanger type, Alzheimer type dementia, and Parkinson’s disease. J Neural Transm 6:119–126
Vanorsdall TD, Jinnah HA, Gordon B, Kraut M, Schrelten D (2008) Cerebral ischemia mediates the effect of serum uric acid on cognitive function. Stroke 39:3418–3420
Verhaaren BF, Vernooji MW, Dehghen A et al (2013) The relation of uric acid to brain atrophy and cognition: the Rotterdam Scan Study. Neuroepidemiology 41(1):29–34. doi:10.1159/000346606
von Elm E, Altman DG, Egger M (2008) The strengthening the reporting of observational studies in epidemiology (STROBE) statement: guidelines for reporting observational studies. J Clin Epidemiol 61(4):344–349. doi:10.1016/j.jclinepi.2007.11.008
Wang X, Luo W, Wang L et al (2009) Study on uric acid and the related factors associated with cognition in the patients with Parkinson’s disease. Zhonghua Yi Xue Za Zhi 89(23):1633–1635
Wells GA, Shea B, O’Connell D et al. The Newcastle-Ottawa Scale (NOS) for assessing the quality if nonrandomized studies in meta-analyses. Available from: URL: http://www.ohri.ca/programs/clinical_epidemiology/oxford.htm
Wen S, Minfeng C, Houliang W et al (2012) Serum uric acid levels and the clinical characteristics of depression. Clin Biochem 45:49–53
Wikkelso C, Blomstrand C, Nordquist P (1981) Cerebrospinal fluid investigations in multi-infarct dementia and senile dementia. Acta Neurol Scand 64:1–11
Wu Y, Zhang D, Pang Z et al (2013) Association of serum uric acid level with muscle strength and cognitive function among Chinese aged 50–74 years. Geriatr Gerontol Int 13:672–677
Yoldas TK, Keklikoglu H, Zengin O et al (2010) Relation of serum uric acid level with cognitive functions and number of plaques in patients with relapsing remitting multiple sclerosis. Nöropsikiyatri Arşivi 47:333–337
You Z, Liu D (2012) The relationship of serum uric acid level with depression and cognitive dysfunction in elderly patients with PD. Chinese J Rehabil 27(4)
Yu ZF, Bruce-Keller AJ, Goodman Y, Mattson MP (1998) Uric acid protects neurons against excitotoxic and metabolic insults in cell culture, and against focal ischemic brain injury in vivo. J Neurosci Res 53:613–625
Zafrilla P, Mulero J, Xandri JM et al (2006) Oxidative stress in alzheimer patients in different stages of the disease. Current I("iI,,'illal Chemistr) 13:1075-1 OS]
Acknowledgments
Dr. J Dawson has access to all relevant project data and takes full responsibility for the data, the analyses and interpretation, and the conduct of the research. There are no conflicts of interest to note.
Dr. Quinn is supported by a joint Stroke Association/Chief Scientist Office Senior Clinical Lectureship.
This project was supported by a Scottish Society of Physicians Research Grant.
Author contributions
Dr Khan—study design, data acquisition, analysis, interpretation, critical revision
Dr. Quinn—study design, data acquisition, analysis, interpretation, critical revision
Dr. Hewitt—study design, interpretation, critical revision
Dr. Fan—data acquisition, interpretation, and critical revision
Dr. Dawson—study design, data acquisition, analysis, interpretation, critical revision, and study supervision
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Khan, A.A., Quinn, T.J., Hewitt, J. et al. Serum uric acid level and association with cognitive impairment and dementia: systematic review and meta-analysis. AGE 38, 16 (2016). https://doi.org/10.1007/s11357-016-9871-8
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DOI: https://doi.org/10.1007/s11357-016-9871-8