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Im SW, Chae J, Son HY, Cho B, Kim JI, Park JH. A population-specific low-frequency variant of SLC22A12 (p.W258*) explains nearby genome-wide association signals for serum uric acid concentrations among Koreans. PLoS One 2020; 15:e0231336. [PMID: 32271837 PMCID: PMC7145145 DOI: 10.1371/journal.pone.0231336] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2019] [Accepted: 03/20/2020] [Indexed: 11/30/2022] Open
Abstract
Prolonged hyperuricemia is a cause of gout and an independent risk factor for chronic health conditions including diabetes and chronic kidney diseases. Genome-wide association studies (GWASs) for serum uric acid (SUA) concentrations have repeatedly confirmed genetic loci including those encoding uric acid transporters such as ABCG2 and SLC9A2. However, many single nucleotide polymorphisms (SNPs) found in GWASs have been common variants with small effects and unknown functions. In addition, there is still much heritability to be explained. To identify the causative genetic variants for SUA concentrations in Korean subjects, we conducted a GWAS (1902 males) and validation study (2912 males and females) and found four genetic loci reaching genome-wide significance on chromosomes 4 (ABCG2) and 11 (FRMD8, EIF1AD and SLC22A12-NRXN2). Three loci on chromosome 11 were distributed within a distance of 1.3 megabases and they were in weak or moderate linkage disequilibrium (LD) states (r2 = 0.02–0.68). In a subsequent association analysis on the GWAS loci of chromosome 11 using closely positioned markers derived from whole genome sequencing data, the most significant variant to be linked with the nearby GWAS signal was rs121907892 (c.774G>A, p.W258*) of the SLC22A12 gene. This variant, and each of the three GWAS SNPs, were in LD (r2 = 0.06–0.32). The strength of association of SNPs with SUA concentration (negative logarithm of P-values) and the genetic distance (r2 of LD) between rs121907892 and the surrounding SNPs showed a quantitative correlation. This variant has been found only in Korean and Japanese subjects and is known to lower the SUA concentration in the general population. Thus, this low-frequency variant, rs121907892, known to regulate SUA concentrations in previous studies, is responsible for the nearby GWAS signals.
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Affiliation(s)
- Sun-Wha Im
- Genomic Medicine Institute, Medical Research Center, Seoul National University, Seoul, Republic of Korea
| | - Jeesoo Chae
- Department of Biomedical Science, Seoul National University Graduate School, Seoul, Republic of Korea
| | - Ho-Young Son
- Genomic Medicine Institute, Medical Research Center, Seoul National University, Seoul, Republic of Korea
| | - Belong Cho
- Departments of Family Medicine, Seoul National University College of Medicine and Seoul National University Hospital, Seoul, Republic of Korea
| | - Jong-Il Kim
- Genomic Medicine Institute, Medical Research Center, Seoul National University, Seoul, Republic of Korea
- Department of Biomedical Science, Seoul National University Graduate School, Seoul, Republic of Korea
- Cancer Research Institute, Seoul National University, Seoul, Republic of Korea
- * E-mail: (JK); (JP)
| | - Jin-Ho Park
- Departments of Family Medicine, Seoul National University College of Medicine and Seoul National University Hospital, Seoul, Republic of Korea
- * E-mail: (JK); (JP)
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Lu W, Gong S, Li J, Wang Y. Clinicopathological features and prognosis in patients with idiopathic membranous nephropathy with hypertension. Exp Ther Med 2020; 19:2615-2621. [PMID: 32256741 PMCID: PMC7086205 DOI: 10.3892/etm.2020.8506] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2019] [Accepted: 11/06/2019] [Indexed: 12/30/2022] Open
Abstract
The present study analyzed the clinicopathological features and prognosis in patients with idiopathic membranous nephropathy (IMN) with hypertension. In the hypertension group, significant differences were found in the age, hypertension history, systolic blood pressure, diastolic blood pressure (DBP), mean arterial pressure, albumin, serum creatinine, low-density lipoprotein, 24 h urine protein levels, calculated estimated glomerular filtration rate (e-GFR), glomerular sclerosis, segmental sclerosis, ischemic sclerosis, interstitial fibrosis, tubular atrophy and vascular lesion compared with the non-hypertension group (P<0.05). The average follow-up time was 35.70 months (5.10-103.77 months). In total, 54 patients reported a 50% decline in e-GFR, eight patients reported progression of disease to end-stage renal disease (ESRD) and nine cases of mortality were reported. Survival analysis results suggested that patients with hypertension had a lower cumulative renal survival rate than those without hypertension (P=0.034). Multivariate Cox hazards regression analysis results suggested that DBP [hazard ratio (H), 5.160; CI, 0.865-0.989; P=0.023], age (H, 4.839; CI, 1.008-1.142; P=0.028), sex (H, 5.680; CI, 0.031-0.714; P=0.017), serum creatinine (H, 20.920; CI, 1.035-1.089; P<0.001), uric acid (H, 4.783; CI, 0.982-0.0.999; P=0.029), 24 h urine protein (H, 6.318; CI, 1.079-1.850; P=0.012), e-GFR (H, 4.008; CI, 1.001-1.062; P=0.045) and glomerular sclerosis (H, 8.722; CI, 1.860-21.559; P=0.003), segmental sclerosis (H, 7.737; CI, 7.770-13.219; P=0.005), percentage of ischemic sclerosis (H, 4.729; CI, 1.444-11.945; P=0.030), crescents (H, 5.938; CI, 0.003-0.526; P=0.015), interstitial fibrosis and tubular atrophy (H, 8.128; CI, 0.005-1.052; P=0.043), and vascular lesion (H, 4.049; CI, 1.030-9.766; P=0.044) were risk factors for the development of IMN into ESRD. The results suggested that DBP may be an independent risk factor for the development of IMN with hypertension.
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Affiliation(s)
- Wanjun Lu
- Department of Nephrology, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330006, P.R. China
| | - Shuhao Gong
- Department of Nephrology, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330006, P.R. China
| | - Juan Li
- Department of Nephrology, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330006, P.R. China
| | - Ying Wang
- Department of Nephrology, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330006, P.R. China
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Zhang X, Lu Q, Zhang Z, Chen Y, Wang Y, Wang Y, Li Z, Jiang L. Value of three-dimensional speckle tracking echocardiography to assess left ventricular function in hyperuricemia patients. Clin Rheumatol 2018; 37:2539-2545. [DOI: 10.1007/s10067-018-4132-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2018] [Revised: 04/13/2018] [Accepted: 05/01/2018] [Indexed: 01/07/2023]
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Fanning N, Merriman TR, Dalbeth N, Stamp LK. An association of smoking with serum urate and gout: A health paradox. Semin Arthritis Rheum 2017; 47:825-842. [PMID: 29398126 DOI: 10.1016/j.semarthrit.2017.11.004] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2017] [Revised: 11/01/2017] [Accepted: 11/16/2017] [Indexed: 12/14/2022]
Abstract
BACKGROUND The potential effect of cigarette smoking on levels of serum urate and risk of gout has been considered by a large number of studies, either as the primary variable of interest or as a covariate. METHODS Here we systematically review the published evidence relating to the relationship of smoking with serum urate, hyperuricaemia, and gout. RESULTS Many studies have reported that smoking reduces serum urate, however, the evidence has not been conclusive with other studies pointing to the opposite or no effect. It has also been suggested that smoking reduces the risk of gout, although there is some evidence to contradict this finding. CONCLUSION A consensus has yet to be reached as to the effect of smoking on serum urate levels and the risk of gout.
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Affiliation(s)
- Niamh Fanning
- Department of Medicine, University of Otago, Christchurch, PO Box 4345, Christchurch, New Zealand.
| | - Tony R Merriman
- Department of Biochemistry, University of Otago, Dunedin, New Zealand
| | - Nicola Dalbeth
- Department of Medicine, University of Auckland, Auckland, New Zealand
| | - Lisa K Stamp
- Department of Medicine, University of Otago, Christchurch, PO Box 4345, Christchurch, New Zealand
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Serum Uric Acid, Alanine Aminotransferase, Hemoglobin and Red Blood Cell Count Levels in Pseudoexfoliation Syndrome. J Ophthalmol 2015; 2015:914098. [PMID: 26075087 PMCID: PMC4444578 DOI: 10.1155/2015/914098] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2015] [Revised: 04/15/2015] [Accepted: 04/15/2015] [Indexed: 11/23/2022] Open
Abstract
Purpose. The pathogenesis of pseudoexfoliation (PEX), the most common cause of secondary glaucoma, has not been clearly identified, but there is increasing evidence that points out the role of oxidative stress. The aim of this study is to evaluate some of the most commonly used blood parameters, hemoglobin (Hb), red blood cell count (RBC), alanine aminotransferase (ALT), and uric acid (UA) levels, in subjects with PEX. Materials and Methods. This study is performed in a state hospital between November 2011 and December 2012. Retrospective chart review of subjects who underwent cataract surgery was performed. Thirty-one healthy subjects with PEX and 34 healthy subjects without PEX were evaluated. Hb, RBC, ALT, and UA levels were recorded. Student's t-test was used to compare the two groups. Results. The mean age was 73.6 ± 14.1 years in PEX group and 70.1 ± 12.7 in control group (p = 0.293). Hb, RBC, ALT, and UA levels did not show a statistically significant difference among PEX and control groups (p > 0.05 for all). Conclusion. Serum levels of Hb, RBC, ALT, and UA levels were similar in subjects with and without PEX. Further studies are needed to clarify the precise role of Hb, RBC, ALT, and UA in the pathogenesis of PEX.
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Jing J, Kielstein JT, Schultheiss UT, Sitter T, Titze SI, Schaeffner ES, McAdams-DeMarco M, Kronenberg F, Eckardt KU, Kottgen A, for the GCKD Study Investigators, Eckardt KU, Titze S, Prokosch HU, Barthlein B, Reis A, Ekici AB, Gefeller O, Hilgers KF, Hubner S, Avendano S, Becker-Grosspitsch D, Hauck N, Seuchter SA, Hausknecht B, Rittmeier M, Weigel A, Beck A, Ganslandt T, Knispel S, Dressel T, Malzer M, Floege J, Eitner F, Schlieper G, Findeisen K, Arweiler E, Ernst S, Unger M, Lipski S, Schaeffner E, Baid-Agrawal S, Petzold K, Schindler R, Kottgen A, Schultheiss U, Meder S, Mitsch E, Reinhard U, Walz G, Haller H, Lorenzen J, Kielstein JT, Otto P, Sommerer C, Follinger C, Zeier M, Wolf G, Busch M, Paul K, Dittrich L, Sitter T, Hilge R, Blank C, Wanner C, Krane V, Schmiedeke D, Toncar S, Cavitt D, Schonowsky K, Borner-Klein A, Kronenberg F, Raschenberger J, Kollerits B, Forer L, Schonherr S, Weissensteiner H, Oefner P, Gronwald W, Zacharias H, Schmid M. Prevalence and correlates of gout in a large cohort of patients with chronic kidney disease: the German Chronic Kidney Disease (GCKD) study. Nephrol Dial Transplant 2014; 30:613-21. [DOI: 10.1093/ndt/gfu352] [Citation(s) in RCA: 64] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
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Abstract
PURPOSE OF REVIEW To discuss the evolving data regarding uric acid as a potential cause of hypertension and progressive renal dysfunction and its clinical and research implications. RECENT FINDINGS The potential mechanisms by which uric acid could cause vasoconstriction and a progressive ateriolopathy were established in animal models between 1999 and 2004. Since then, there has been a growing interest in the topic and numerous retrospective and prospective observational studies. The preponderance of data support the hypothesis that serum uric acid is a cause or exacerbating factor of hypertension and progressive kidney disease. Over the last couple of years clinical intervention trials, including randomized controlled trials in the young have supported this mechanistic role. SUMMARY Current evidence supports the role of uric acid as marker and mediator of risk for both hypertension and progressive decline in renal function. Data on the impact of xanthine oxidase inhibitors or uricosurics on clinical hypertension and chronic kidney disease are suggestive but inconclusive. Considerably, more data will be required to determine if uric acid lowering therapy will become a mainstay of management in diseases other than gout and tumor lysis syndrome.
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Prevalence of hyperuricemia among Chinese adults: a national cross-sectional survey using multistage, stratified sampling. J Nephrol 2014; 27:653-8. [PMID: 24687401 DOI: 10.1007/s40620-014-0082-z] [Citation(s) in RCA: 150] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2013] [Accepted: 03/14/2014] [Indexed: 01/10/2023]
Abstract
BACKGROUND Hyperuricemia is a non-communicable disease that threatens human health, and its prevalence has been increasing in recent decades. However, there have been no national surveys about hyperuricemia performed in China. We aimed to investigate the prevalence of hyperuricemia and its risk factors in Chinese adults. METHODS Using data from 36,348 participants aged 18 years and older from the China National Survey of Chronic Kidney Disease (a nationwide cross-sectional survey with a randomized, multistage, stratified sampling strategy), we investigated the prevalence of hyperuricemia. Male subjects with serum uric acid ≥416.0 μmol/l (7.0 mg/dl) and female subjects with ≥357.0 μmol/l (6.0 mg/dl) were diagnosed with hyperuricemia. The prevalence of hyperuricemia was calculated, and the factors associated with hyperuricemia were analyzed using logistic regression. RESULTS The adjusted prevalence of hyperuricemia among Chinese adults in 2009-2010 was 8.4 % [95 % confidence interval (CI) 8.0-8.8 %], and it was 9.9 % (9.2-10.6 %) in men and 7.0 % (6.5-7.5 %) in women. The prevalence was much higher among urban than rural residents (14.9 vs. 6.6 %, p < 0.01). Areas with high per capita gross domestic product (GDP) levels had higher prevalence of hyperuricemia. In the multivariate regression model, the estimated glomerular filtration rate was inversely associated with hyperuricemia. Alcohol consumption, body mass index and serum triglyceride levels were positively correlated with hyperuricemia. Other factors independently correlated with hyperuricemia were age, sex, education level, area of residence, and economic development. In order to demonstrate the discriminatory power for hyperuricemia of the risk factors all together, we calculated the probabilities by logistic regression analysis, which represented the combined effects of these risk factors. Then, receiver operating characteristic analysis was used to demonstrate the value of the probabilities for hyperuricemia diagnosis. Finally, ROC curve analysis revealed the area under the curve was 0.746 (95 % CI 0.739-0.754), statistically significant for the association with hyperuricemia of these risk factors considered all together (p < 0.001). CONCLUSIONS Hyperuricemia is prevalent in the economically developed areas of China. Our report indicates the feasibility of studying the influence that economic changes have on the prevalence of hyperuricemia.
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Abstract
Gout is the most common inflammatory arthritis worldwide. Although effective treatments exist to eliminate sodium urate crystals and to 'cure' the disease, the management of gout is often suboptimal. This article reviews available treatments, recommended best practice and barriers to effective care, and how these barriers might be overcome. To optimize the management of gout, health professionals need to know not only how to treat acute attacks but also how to up-titrate urate-lowering therapy against a specific target level of serum uric acid that is below the saturation point for crystal formation. Current perspectives are changing towards much earlier use of urate-lowering therapy, even at the time of first diagnosis of gout. Holistic assessment and patient education are essential to address patient-specific risk factors and ensuring adherence to individualized therapy. Shared decision-making between a fully informed patient and practitioner greatly increases the likelihood of curing gout.
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Affiliation(s)
- Frances Rees
- Division of Academic Rheumatology, University of Nottingham, Clinical Sciences Building, City Hospital Nottingham, Hucknall Road, Nottingham NG5 1PB, UK
| | - Michelle Hui
- Division of Academic Rheumatology, University of Nottingham, Clinical Sciences Building, City Hospital Nottingham, Hucknall Road, Nottingham NG5 1PB, UK
| | - Michael Doherty
- Division of Academic Rheumatology, University of Nottingham, Clinical Sciences Building, City Hospital Nottingham, Hucknall Road, Nottingham NG5 1PB, UK
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Voruganti VS, Franceschini N, Haack K, Laston S, MacCluer JW, Umans JG, Comuzzie AG, North KE, Cole SA. Replication of the effect of SLC2A9 genetic variation on serum uric acid levels in American Indians. Eur J Hum Genet 2013; 22:938-43. [PMID: 24301058 DOI: 10.1038/ejhg.2013.264] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2013] [Revised: 10/08/2013] [Accepted: 10/18/2013] [Indexed: 12/21/2022] Open
Abstract
Increased serum uric acid (SUA) or hyperuricemia, a risk factor for gout, renal and cardiovascular diseases, is caused by either increased production or decreased excretion of uric acid or a mix of both. The solute carrier protein 2 family, member 9 (SLC2A9) gene encodes a transporter that mediates urate flux across the renal proximal tubule. Genome-wide association studies have consistently shown the association of single-nucleotide polymorphisms in this gene with SUA in majority populations. American Indian participants of the Strong Heart Family Study, belonging to multigenerational families, have high prevalence of hyperuricemia. We conducted measured genotype analyses, based on variance components decomposition method and accounting for family relationships, to assess whether the association between SUA and SLC2A9 gene polymorphisms generalized to American Indians (n=3604) of this study. Seven polymorphisms were selected for genotyping based on their association with SUA levels in other populations. A strong association was found between SLC2A9 gene polymorphisms and SUA in all centers combined (P-values: 1.3 × 10(-31)-5.1 × 10(-23)) and also when stratified by recruitment center; P-values: 1.2 × 10(-14)-1.0 × 10(-5). These polymorphisms were also associated with the estimated glomerular filtration rate and serum creatinine but not albumin-creatinine ratio. In summary, the association of polymorphisms in the uric acid transporter gene with SUA levels extends to a new population of American Indians.
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Affiliation(s)
- V Saroja Voruganti
- 1] Department of Nutrition and Nutrition Research Institute, University of North Carolina at Chapel Hill, Kannapolis, NC, USA [2] Department of Genetics, Texas Biomedical Research Institute, San Antonio, TX, USA
| | - Nora Franceschini
- Department of Epidemiology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Karin Haack
- Department of Genetics, Texas Biomedical Research Institute, San Antonio, TX, USA
| | - Sandra Laston
- Department of Genetics, Texas Biomedical Research Institute, San Antonio, TX, USA
| | - Jean W MacCluer
- Department of Genetics, Texas Biomedical Research Institute, San Antonio, TX, USA
| | - Jason G Umans
- 1] Medstar Health Research Institute, Hyattsville, MD, USA [2] Georgetown-Howard Universities Center for Clinical and Translational Science, Washington, DC, USA
| | - Anthony G Comuzzie
- Department of Genetics, Texas Biomedical Research Institute, San Antonio, TX, USA
| | - Kari E North
- 1] Department of Epidemiology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA [2] Carolina Center for Genome Sciences, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Shelley A Cole
- Department of Genetics, Texas Biomedical Research Institute, San Antonio, TX, USA
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Abstract
Although Alaska Native peoples were thought to be protected from cardiovascular disease (CVD), data now show that this is not the case, despite traditional lifestyles and high omega-3 fatty acid intake. In this article, the current understanding of CVD and its risk factors among Alaska Native peoples, particularly among the Yupik and Inupiat populations, will be discussed, using data from three major studies funded by the National Institutes of Health: Genetics of Coronary Artery Disease among Alaska Natives (GOCADAN), Center for Native Health Research (CANHR), and Education and Research Towards Health (EARTH). Data from these epidemiologic studies have focused concern on CVD and its risk factors among Alaska Native peoples. This review will summarize the findings of these three principal studies and will suggest future directions for research and clinical practice.
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Katsiki N, Karagiannis A, Athyros VG, Mikhailidis DP. Hyperuricaemia. J Cardiovasc Med (Hagerstown) 2013; 14:397-402. [DOI: 10.2459/jcm.0b013e3283595adc] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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Feig DI, Madero M, Jalal DI, Gabriela Sanchez-Lozada L, Johnson RJ. Uric acid and the origins of hypertension. J Pediatr 2013; 162:896-902. [PMID: 23403249 PMCID: PMC7556347 DOI: 10.1016/j.jpeds.2012.12.078] [Citation(s) in RCA: 80] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/27/2012] [Revised: 11/19/2012] [Accepted: 12/21/2012] [Indexed: 12/29/2022]
Affiliation(s)
- Daniel I. Feig
- Division of Pediatric Nephrology, University of Alabama, Birmingham
| | - Magdalena Madero
- Division of Nephrology, National Heart Institute, INC Ignacio Chavez, Mexico City Mexico City
| | - Diana I. Jalal
- Division of Renal Diseases and Hypertension, University of Colorado, Aurora
| | | | - Richard J Johnson
- Division of Renal Diseases and Hypertension, University of Colorado, Aurora
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Cakar M, Sarlak H, Balta S, Unlu M, Demirbas S, Demirkol S. Serum uric acid still carries controversies about its role in endothelial dysfunction. J Clin Hypertens (Greenwich) 2013; 15:296. [PMID: 23551731 DOI: 10.1111/jch.12066] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Feig DI. Hyperuricemia and hypertension. Adv Chronic Kidney Dis 2012; 19:377-85. [PMID: 23089272 DOI: 10.1053/j.ackd.2012.05.009] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2012] [Revised: 05/22/2012] [Accepted: 05/23/2012] [Indexed: 01/22/2023]
Abstract
Over the past century, uric acid has been considered a possible risk factor for hypertension and cardiovascular disease. However, only in the past decade, animal models and clinical trials have supported a more mechanistic link. Results from animal models suggest a 2-phase mechanism for the development of hyperuricemic hypertension in which uric acid induces acute vasoconstriction by activation of renin-angiotensin system, followed by uric acid uptake into vascular smooth muscle cells leading to cellular proliferation and secondary arteriolosclerosis that impairs pressure natriuresis. This acute hypertension remains uric acid dependent and sodium independent, whereas the chronic hypertension becomes uric acid independent and sodium dependent. Small clinical trials, performed in adolescents with newly diagnosed essential hypertension, demonstrate that reduction of serum uric acid can reduce blood pressure. Although more research is clearly necessary, the available data suggest that uric acid is likely causative in some cases of early onset hypertension.
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Dyck RF, Naqshbandi Hayward M, Harris SB. Prevalence, determinants and co-morbidities of chronic kidney disease among First Nations adults with diabetes: results from the CIRCLE study. BMC Nephrol 2012; 13:57. [PMID: 22776036 PMCID: PMC3438064 DOI: 10.1186/1471-2369-13-57] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2012] [Accepted: 06/18/2012] [Indexed: 11/30/2022] Open
Abstract
BACKGROUND Indigenous peoples worldwide are experiencing elevated rates of type 2 diabetes and its complications. To better understand the disproportionate burden of diabetic end stage renal disease (ESRD) among Canadian First Nations people (FN), we examined prevalence, determinants, and co-morbidities of chronic kidney disease (CKD) within this population. METHODS The 2007 Canadian FN Diabetes Clinical Management and Epidemiologic (CIRCLE) study conducted a cross-sectional national medical chart audit of 885 FN adults with type 2 diabetes to assess quality of diabetes care. In this sub-study, participants were divided by estimated glomerular filtration rate (eGFR in ml/min/1.73 m2), as well as by albuminuria level in those with eGFRs = > 60. Those with eGFRs = > 60 and negative albuminuria were considered to have normal/near normal kidney function (non-CKD). Using univariate and logistic regression analysis, they were compared with participants having eGFRs = > 60 plus albuminuria (CKD-alb) and with participants having eGFRs <60 (CKD-eGFR <60). RESULTS While 84.5% of total CIRCLE participants had eGFRs = > 60, almost 60% of the latter had CKD-alb. Of the 15.5% of total participants with CKD-eGFR <60, 80% had eGFRs 30-60 (Stage 3 CKD) but over 10% (1.6% of total participants) had ESRD. Independent determinants of CKD-alb were male gender and increasing diabetes duration, systolic BP, A1C and total cholesterol. These plus smoking rates also discriminated between FN with micro- and macro-albuminuria. Independent determinants of CKD-eGFR <60 were increasing age at diabetes diagnosis, diabetes duration, total cholesterol and systolic BP. However, participants with CKD-eGFR <60 also displayed a decreasing mean age of diabetes diagnosis as eGFR declined. Micro-vascular co-morbidities were significantly associated with CKD-alb but both micro- and macro-vascular co-morbidities were associated with CKD-eGFR <60. Only 35-40% of participants with CKD used insulin. CONCLUSIONS High prevalences of CKD-alb and early CKD-eGFR <60 among diabetic FN were largely related to modifiable and treatable risk factors. However, an earlier age of diabetes diagnosis and longer duration of diabetes characterized those with ESRD. These findings suggest that a failure to meet current standards of diabetes care interacting with an age-related survival benefit contribute to the disproportionate burden of ESRD among FN and possibly other Indigenous peoples.
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Affiliation(s)
- Roland F Dyck
- Department of Medicine, Royal University Hospital, 103 Hospital Drive, Saskatoon, SK, S7N 0W8, Canada
- Department of Community Health and Epidemiology, University of Saskatchewan, Saskatoon, SK, S7N 5E5, Canada
| | - Mariam Naqshbandi Hayward
- Centre for Studies in Family Medicine, Department of Family Medicine, The University of Western Ontario, London, Ontario, N6G 4X8, Canada
| | - Stewart B Harris
- Centre for Studies in Family Medicine, Department of Family Medicine, The University of Western Ontario, London, Ontario, N6G 4X8, Canada
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Feig DI. The role of uric acid in the pathogenesis of hypertension in the young. J Clin Hypertens (Greenwich) 2012; 14:346-52. [PMID: 22672087 PMCID: PMC8108870 DOI: 10.1111/j.1751-7176.2012.00662.x] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2012] [Revised: 04/05/2012] [Accepted: 04/06/2012] [Indexed: 01/21/2023]
Abstract
Uric acid has been suspected to be a risk factor for hypertension since the 1870s. Numerous epidemiological studies demonstrate an association between uric acid and both incident and prevalent hypertension in diverse populations. Studies in elderly patients have had more variable results, raising the possibility that uric acid may be more significant to hypertension in the young. Animal models support a two-phase mechanism for the development of hyperuricemic hypertension. Initially, uric acid induces vasoconstriction by activation of the renin-angiotensin system and reduction of circulating nitric oxide, which can be reversed by lowering uric acid. Over time, uric acid uptake into vascular smooth muscle cells causes cellular proliferation and secondary arteriolosclerosis that impairs pressure natriuresis, causing sodium-sensitive hypertension. Consistent with the animal model data, small clinical trials performed in adolescents with newly diagnosed essential hypertension demonstrate that at least in certain young patients, reduction of serum uric acid can mitigate blood pressure elevation. While more research is clearly necessary, the available data suggest that uric acid is likely causative in some cases of early-onset hypertension.
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Affiliation(s)
- Daniel I Feig
- Division of Nephrology, Department of Pediatrics, University of Alabama at Birmingham, 1600 7th Avenue South, Birmingham, AL 35233, USA.
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