Increased Serum Uric Acid Concentration Research Articles

Potential protective effects of increased serum uric acid concentration in sarcopenia: A meta-analysis and systematic review.

Previous studies on the association between serum uric acid (UA) levels and sarcopenia have yielded contradictory results. This meta-analysis and literature review assessed the association between serum UA levels and sarcopenia. Moreover, we conducted a comparative analysis of the differences in serum UA concentrations between individuals with and without sarcopenia. A systematic search was conducted across various medical databases, namely PubMed, EMBASE, Web of Science, Cochrane Library, CNKI, and Wanfang (from the start to August 20, 2023). This search focused on published studies that investigated the relationship between serum UA levels and sarcopenia. The relationship between serum UA concentration and the occurrence of sarcopenia was analyzed, and the differences in serum UA concentrations between individuals with sarcopenia and control groups were reviewed. Statistical analysis was performed using STATA 11.0 and R 4.1.3. Sixteen studies were considered for our analysis. The results indicated a significant association between low serum UA concentration and a higher sarcopenia risk, particularly among male patients (adjusted odds ratio = 0.65, 95% confidence interval [CI] = 0.49, 0.87, P = .004, I2 = 0%). Individuals with sarcopenia exhibited decreased serum UA concentrations compared with those of the control group (mmol/L: weighted mean difference = -28.25, 95% CI = -40.45, -16.05, P < .001; mg/dL: weighted mean difference = -0.82, 95% CI = -1.05, -0.58, P < .001). Additionally, serum UA concentration was positively correlated with skeletal muscle mass index and handgrip strength (skeletal muscle index: correlation coefficient = 0.17, 95% CI = 0.11, 0.22, P < .001; handgrip strength: common odds ratios = 0.10, 95% CI = 0.06, 0.14, P < .001). Individuals with sarcopenia have relatively low serum UA concentrations. A notable correlation between serum UA concentration and sarcopenia was observed. Hence, monitoring UA levels could aid in the early detection and treatment of sarcopenia, enabling timely intervention to preserve muscle mass and strength.

Serum metabolomics identifies uric acid as a possible novel biomarker for predicting recurrence of chronic rhinosinusitis with nasal polyps.

Metabolomics has proven to be a valuable tool in gaining new insights into disease progression and prognosis, the specific metabolic alterations in the serum of recurrent chronic rhinosinusitis with nasal polyps (CRSwNP) patients remain unknown. This study aims to explore the serum metabolomic profiles of recurrent CRSwNP and identify potential predictive biomarkers. A prospective, single-center study was conducted on CRSwNP patients prior to endoscopic sinus surgery. Serum samples were subjected to untargeted metabolomic profiling. Patients were followed up for over 2 years and categorized into recurrence and non-recurrence groups. Metabolite differences between the two groups were compared, and the identified differentially regulated metabolites were subsequently validated in a large clinical cohort. 67 CRSwNP patients completed the follow-up schedule, with 47 classified into the non-recurrent group and 20 into the recurrent group. Significant differences were found in the metabolomic profiles between both groups, and serum uric acid (SUA) showed promising predictive potential for postoperative recurrence in both positive and negative ion models. A validation cohort comprising 398 non-recurrent and 142 recurrent CRSwNP patients was recruited, and a significant elevation in SUA levels was observed in recurrent cases. Patients were stratified into tertiles based on the distribution of baseline SUA levels. Multivariate Cox regression analysis showed that higher tertiles of SUA were associated with an increased risk of CRSwNP recurrence compared to lower tertiles, even after adjusting for potential confounding factors. The receiver operating characteristic curve and Kaplan-Meier survival analysis highlighted that elevated SUA levels exhibited potential predictive values for postoperative recurrence. Serum metabolic signatures might predict postoperative recurrence in CRSwNP patients. Increased SUA concentrations were found to be associated with a higher risk of future postoperative recurrence in CRSwNP, independent of traditional risk factors.

Associations of early pregnancy serum uric acid levels with risk of gestational diabetes and birth outcomes: a retrospective cohort study

BackgroundPrevious evidence suggests that higher blood uric acid (UA) levels are associated with adverse cardiovascular outcomes during pregnancy and subsequent birth outcomes. However, it has been relatively unclear whether these associations persist in normotensive pregnant women.MethodsThe study was based on a retrospective analysis of 18,250 mother-infant pairs in a large obstetric center in China. Serum UA concentrations in early pregnancy (median: 17.6, IQR: 16.3, 18.6 gestational weeks) were assessed. Hyperuricemia was defined as ≥ one standard deviation (SD) of the reference value for the corresponding gestational age. Outcomes of gestational diabetes mellitus (GDM), preterm birth (PB), low birth weight (LBW), macrosomia, small for gestational age (SGA) and large for gestational age (LGA) were extracted from the medical records.ResultsThe mean maternal UA level was 0.22 ± 0.05 mmol/L, and 2,896 (15.9%) subjects had hyperuricemia. After adjustment for several covariates, UA was associated with several adverse outcomes. The ORs (95%CI) per one SD increase in serum UA concentration were 1.250 (1.136, 1.277) for GDM, 1.137 (1.060, 1.221) for PB, 1.134 (1.051, 1.223) for LBW, and 1.077 (1.020, 1.137) for SGA, respectively. Similar adverse associations were found between hyperuricemia and GDM, PB (ORs: 1.394 and 1.385, P < 0.001), but not for LBW, macrosomia, SGA, and LGA. Adverse associations tended to be more pronounced in subjects with higher BMI for outcomes including PB, LBW, and SGA (P interaction = 0.001–0.028).ConclusionHigher UA levels in early pregnancy were associated with higher risk of GDM, PB, LBW, and SGA in normotensive Chinese women.

Urinary levels of kidney injury molecule-1 (KIM-1) and interleukin-18 (IL-18) in children and adolescents with hyperuricemia

PurposeHyperuricemia may lead to silent tissue damage and increase the risk of some diseases, including kidney diseases. Increased serum uric acid concentration induces inflammatory pathways and promotes kidney damage. This study aimed to determine whether hyperuricemia influences the levels of urinary kidney injury markers in children and adolescents with hyperuricemia, assessed by the urinary concentrations of interleukin-18, a biomarker of inflammation, and kidney injury molecule-1 (KIM-1), a biomarker of kidney injury. Material and methodsThe study included 73 children and adolescents (32 males and 41 females) aged 2–18 years. They were divided into two groups: hyperuricemia (HU) group (n ​= ​48) and normouricemia – reference group (R) (n ​= ​25). The concentrations of urinary interleukin-18 and KIM-1 were measured using an ELISA kit and were normalized for urinary creatinine (cr.) concentration. ResultsThe median interleukin-18/cr. Levels in the HU group were significantly higher than in the R group (median, Q1-Q3) 21.83 (11.32–35.96) and 12.68 (7.11–24.04), respectively, (p ​< ​0.05). The KIM-1/cr. in the HU group and the R group were (median, Q1-Q3) 0.79 (0.45–1.03) and 0.81 (0.59–1.01), respectively, and the difference was not significant. KIM-1/cr. did not differ between the groups. Interleukin-18/cr. ratio correlated positively with serum uric acid concentration (r ​= ​0.24, p ​< ​0.05). ConclusionsInterleukin-18/cr., but not KIM-1/cr. was higher in children with hyperuricemia. Hyperuricemia results in increased IL-18 in urine, in absence of other markers of kidney injury, suggesting inflammation in the kidney. Additional studies on the adults should be done, to confirm this hypothesis.

Hypouricemic, anti-inflammatory, and antioxidant activities of Lactobacillus-based functional yogurt in induced-arthritic male Wistar rats: Therapeutic and protective potentials

Hyperuricemia is the increased serum uric acid concentration, associated with metabolic syndrome that commonly leads to heart disease, gout, and chronic nephropathy. In animals, uric acid can be oxidized by the uricase enzyme and excreted in the urine. Unfortunately, humans lack uricase. This study aimed to find uricase-producing probiotic lactobacilli. L. plantarum KU985438 and L. rhamnosus KU985439 were selected to produce functional fermented yogurts. Induced-hyperuricemic animal models were used to test the yogurts' hypouricemic, anti-inflammatory, and antioxidant effects. Male Wistar rats fed probiotics orally for seven days showed decreased levels of uric acid and ankle edema in the therapeutic and protective groups compared to the control (indomethacin-treated). The two yogurts also reduced TNF-α, IL-1β, and NF-kB concentrations in inflamed joints by decreasing oxidative stress. Histopathology showed arthritis rats with abnormalities, deformities, necrosis, and edema in their joints. In the protective group, the synovial membrane and articular surface were nearly normal with the administration of the two yogurts concurrently with hyperuricemia induction. In the therapeutic group, retrieval from hyperuricemia was observed after 7 days of probiotic administration. Immuno-staining of the reactive immune cells (iNOS) in arthritic rats showed high expression levels. Both conventional medicine and yogurts reduced immune-reactive cell activity in arthritis-affected rats. To the authors’ knowledge, this study is considered the first to explore the efficacy of lactobacilli on the reactive immune cell expression in arthritic rats. In conclusion, L. plantarum and L. rhamnosus, with potent therapeutic and protective efficacy against MSU-induced arthritis, could be used as functional food supplements.

Relationship between bisphenol A, bisphenol S, and bisphenol F and serum uric acid concentrations among school-aged children.

BackgroundHyperuricemia has a suspected relationship with hypertension, metabolic syndrome, kidney disease, and cardiovascular disease. Endocrine disruptors may affect uric acid metabolism; however, few epidemiologic studies have been performed in children regarding newly developed bisphenol A (BPA) substitutes. We evaluated the associations between BPA, bisphenol S (BPS), and bisphenol F (BPF) exposure and serum uric acid concentrations in 6-year-old Korean children.MethodsFrom the Environment and Development of Children cohort study, six-year-old children (N = 489; 251 boys) who underwent an examination during 2015–2017 were included. Anthropometry, questionnaires, and biological samples were evaluated. BPA, BPS, and BPF levels were measured from spot urine samples, and log-transformed or categorized into groups for analysis. We constructed linear regression models adjusting for age, sex, urinary creatinine levels, body mass index z-scores, and estimated glomerular filtration rates.ResultsMean serum uric level was 4.2 mg dL-1 (0.8 SD) without sex-differences. Among the three bisphenols, higher BPS exposure was associated with increased serum uric acid concentrations (P-value for trend = 0.002). When BPS levels were categorized into three groups (non-detection < 0.02 μg L-1 vs. medium BPS; 0.02–0.05 μg L-1 vs. high BPS ≥ 0.05 μg L-1), the high BPS group showed higher serum uric acid concentrations (by 0.26 mg dL-1, P = 0.003) than the non-detection group after adjusting for covariates, which was significant in boys but not girls.DiscussionsUrinary BPS levels was positively associated with serum uric acid concentrations in 6-year-old children, and the association was more pronounced in boys. Considering the increasing use of BPS and concerning effect of hyperuricemia on health outcomes, their positive relationship should be investigated further.

No Evidence for a Causal Link between Serum Uric Acid and Nonalcoholic Fatty Liver Disease from the Dongfeng-Tongji Cohort Study.

Background and Aims Elevated serum uric acid (SUA) is associated with an increased risk of nonalcoholic fatty liver disease (NAFLD); however, whether this association is causal is undetermined. Methods Each participant from the Dongfeng-Tongji cohort study based on 27,009 retirees was interviewed face-to-face following a clinical examination. Covariance, logistic regression analysis, and instrumental variables were used to assess associations between SUA and (severity of) NAFLD and the causal link. Results Among 8,429 subjects free of NAFLD at baseline, 2,007 participants developed NAFLD after 5 years of follow-up. The multivariable-adjusted odds ratio (OR) for NAFLD for individuals in the fourth quartile of SUA level versus those in the first was 1.71 (95% CI: 1.45-2.01, P for trend <0.001) and was more dramatic in women or normal-weight persons. Furthermore, SUA was materially associated with greater mean markers of hepatic necroinflammation and greater probabilities of fibrosis. In genetic analyses, both single nucleotide polymorphisms (rs11722228 to SLC2A9 and rs2231142 to ABCG2) were pronouncedly associated with increased SUA concentrations, ranging from 0.19 to 0.22 mg/dl. No significant associations were observed between SNPs and potential confounders. No association was observed between the SUA-increasing allele and NAFLD, with an OR of 0.98 (95% CI: 0.90-1.08) per genetic score. This was not significantly different (P = 0.25) from what was expected (1.03, 95% CI: 1.03-1.03). Conclusions SUA was positively associated with NAFLD incidence especially in female and normal-weight individuals and the suspected progression risk of newly developed NAFLD. However, the Mendelian randomization analyses lend no causal evidence, suggesting high SUA as a marker and not a cause of NAFLD.

Prevalence of metabolic syndrome among undergraduate students in University of Nigeria, Nsukka

<h2>Summary</h2> Elevation of serum uric acid (SUA) is linked with the development of certain disease conditions such as cardiovascular diseases, chronic kidney disease, stroke, hypertension, and metabolic syndrome (MS). Although limited information exists to prove its association, a good number of studies and clinical trials support its role. This study investigate the relationship between MS and SUA of the undergraduate students of the University of Nigeria, Nsukka. Body mass index (BMI), blood pressure, fasting blood sugar (FBS), serum lipid profile, and SUA concentrations of 229 students comprising of 89 males and 140 females were determined following standard procedures with little modifications where necessary. Result reveals that body weight, systolic blood pressure (SBP), diastolic blood pressure (DBP), FBS, low density lipoprotein (LDL), total cholesterol (TC), high density lipoprotein (HDL), triacylglycerol (TAG) and serum uric acid concentration had no significant difference between the age groups while height, pulse, waist, and BMI had significant (p < 0.05) difference between the age groups. The SUA correlates positively with sex (r = 0.650, p < 0.01), SBP (r = 0.250, p < 0.01), TC (r = 0.205, p < 0.01) and triacylglycerol (r = 0.550, p < 0.01). The result of this study demonstrates that an increase in SUA concentration may lead to a concomitant increase in blood pressure, total cholesterol, and triacylglycerol which in turn may predispose the subjects to MS within the different age groups as revealed by our data.

Serum Uric Acid Levels and Their Changes and Risk of Stroke: A 7-Year Prospective Cohort Study in Northwest China

Introduction: It is not clear whether serum uric acid (SUA) levels and their changes over time are associated with the risk of stroke. A 7-year prospective cohort study in northwest China was conducted to analyze effects of SUA and their changes on the risk of stroke. Methods: A total of 23,262 individuals without cardiovascular disease in the Jinchang cohort were followed up for an average of 5.26 years. The Cox proportional hazard model was used to estimate the hazard ratios (HRs) and 95% confidence interval (95% CI) of stroke incidence to SUA and relative changes in SUA. Sensitivity analysis was performed after controlling the effect of renal insufficiency. Results: Baseline SUA and relative changes in SUA were positively correlated with the incidence of stroke in both males and females (p for overall association <0.0001). Stroke risk increased by 4.6% per 10% increase in the relative change of SUA (HR = 1.046, 95% CI, 1.007–1.086). The fully adjusted regression analysis demonstrated that only the large gain (>30%) in SUA was associated with an increased risk of stroke by 36.5% (95% CI, 1.8–83.0%), compared with the reference group (participants within ±10% changes in SUA). The same trend was observed in people with normal baseline SUA. In the unadjusted model, the risk of stroke associated with elevated SUA was significantly higher in the hyperuricemia group than in the normal SUA group. Conclusion: High initial SUA concentration and an increase in SUA concentration over time would increase the risk of stroke, and this means that there is no safe increase in SUA.

URIC ACID IN PEDIATRIC PATIENTS WITH PRIMARY HYPERTENSION

Abstract Objective: Increased concentration of uric acid may play a role in the pathogenesis of primary hypertension (PH). Aim of the study was to assess concentration of uric acid and its correlation with selected clinical and biochemical parameters in children with PH. Design and method: In a group of 57 untreated pharmacologically children with PH (44 boys, 13 girls, mean age 14.99 ± 2.84 years) following parameters were assessed: serum uric acid concentration [mg/dL], blood pressure in office measurement and in 24-hour ambulatory blood pressure monitoring, and selected clinical and biochemical parameters. Control group consisted of 20 healthy children (mean 14.11 ± 2.99 years). Results: Serum uric acid concentration was significantly higher in children with PH compared to healthy children (5.72 ± 1.38 vs. 4.55 ± 1.07 [mg/dL]; p = 0.001). In patients with PH, its concentration was significantly higher in boys compared to girls ((6.12 ± 1.20 mg/dL vs. 4.35 ± 1.13 mg/dL, p &lt; 0.001), no such difference was found in healthy children. In the PH group, uric acid concentration correlated positively with age (r = 0.426, p = 0.001), height (r = 0.557, p &lt; 0.001), weight (r = 0.518, p &lt; 0.001), weight Z- score (r = 0.296, p = 0.025), BMI (r = 0.316, p = 0.017), neutrophil count (r = 0.280, p = 0.035), systolic blood pressure (r = 0.375, p = 0.004) and pulse pressure (r = 0.444, p = 0.001) in ABPM and negatively with HDL cholesterol, heart rate (r = -0.310, p = 0.02 (1 = -0.309, p = 0.020) and nighttime diastolic blood pressure dip (r = -0.268, p = 0.044) in ABPM. In multivariate analysis, the determinants of uric acid concentration in children with PH were sex (beta = 0,367, 95%CI (0.122–0.611), p = 0.004) and weight Z-score (beta = 0.254, 95%CI (0.005–0.504), p = 0.046). Conclusions: Children with primary hypertension have increased serum uric acid concentration compared to healthy children. The risk factors for hyperuricemia in pediatric patients with primary hypertension are male sex and high body weight.

Consumption of sugar-sweetened beverages and serum uric acid concentrations: a systematic review and meta-analysis.

Serum uric acid concentration has been linked with metabolic abnormalities. The available evidence on the association of Sugar-Sweetened Beverage (SSB) intake with serum uric acid concentrations is conflicting. The present study aimed to summarise earlier findings on the association of SSB consumption with serum uric acid concentrations in adults. Using relevant keywords, we conducted a search in PubMed (https://pubmed.ncbi.nlm.nih.gov), Scopus (https://www.scopus.com) and Google Scholar (https://scholar.google.com) up to September 2017 for all published papers assessing SSB intake and serum uric acid concentrations. SSBs were defined as the dietary intake of Sugar-Sweetened Soft Drinks and Fruit Juice (FJ), or as Sugar-Sweetened Soft Drinks, Diet Soft Drinks and Orange Juice or as Soda and FJ. After excluding non-relevant papers, five studies, with six effect sizes, remained in our systematic review. All studies included in the current systematic review were of cross-sectional design that were published between 2007 and 2013. The number of participants ranged from 483 to 14761 people. Most studies had controlled for age, body mass index, weight and sex. We found that individuals in the highest category of SSB intake had 0.18mgdL-1 greater concentrations of serum uric acid compared to those in the lowest category (summary effect size: 0.18mgdL-1 ; 95% confidence interval=0.11-0.25). No significant between-study heterogeneity was found (I2 =0.0%, P=0.698). In the sensitivity analysis, we found no particular study influence on the summary effect. There was no evidence of publication bias. We found that SSB consumption was significantly associated with increased serum uric acid concentrations in an adult population.

High serum uric acid is associated with oxidation of nucleosides in patients with type 2 diabetes

Uric acid presents different roles in an organism, since it can act as an antioxidant or a pro-oxidant molecule. High serum uric acid levels may cause damage to several structures, including nucleic acids and its components. Therefore, in this study the association between increased serum uric acid concentrations and oxidation of nucleosides was investigated by assessment of urinary 8-hydroxydeoxyguanosine (8-OHdG) in patients with type 2 diabetes (T2D) and in healthy individuals. Urinary 8-OHdG and biochemical parameters were assessed in 61 patients who were initially grouped into 2 groups based on the median serum uric acid levels (<5.3 mg/dL and ≥5.3 mg/dL). Urinary 8-OHdG was higher in patients with T2D and serum uric acid levels ≥5.3 mg/dL, when compared with the patients with serum uric acid levels <5.3 mg/dL; however, co-occurrence of high serum uric acid with high urinary 8-OHdG was not observed in healthy individuals. A significant positive correlation between 8-OHdG and uric acid (r = 0.40, P < 0.01) was observed in patients with T2D. High serum uric acid levels were associated with high urinary 8-OHdG levels in patients with T2D, and this association was independent of gender, hypertension, body mass index, and serum creatinine.

Effect of hydrochlorothiazide on serum uric acid concentration: a genome-wide association study.

To recognize genetic associations of hydrochlorothiazide-induced change in serum uric acid (SUA) concentration. We conducted a genome-wide association study on hydrochlorothiazide-induced change in SUA in 214 Finnish men from the GENRES study. Replication analyses were performed in 465 Finns from the LIFE study. In GENRES, we identified 31 loci associated with hydrochlorothiazide-induced change in SUA at p<5×10-5. rs1002976 near VEGFC associated with the change in GENRES and in LIFE. rs950569 near BRINP3 associated with the change in SUA in GENRES and LIFE. The analysis of previously reported SNPs and candidate genes provided some proof for PADI4 and ABCC4. We report genetic markers that may predict the increase in SUA concentration during thiazide treatment.

Visceral adiposity index associated with behavioral and inflammatory parameters in adults: a population based study.

the visceral adiposity index (VAI) is an indicator of fat distribution and function which is considered a predictor of cardiometabolic risk. analyze the factors associated with VAI in Brazilian adults. a cross-sectional population-based study was conducted with 854 adults, in Viçosa, MG, Brazil. A questionnaire was applied and anthropometric measurements, body composition and biochemical data were collected. Ordinal logistic regression was used to evaluate the factors associated with VAI. the increase in percentage of fat, uric acid concentration and ultra-sensitive C reactive protein in the blood was positively associated with VAI in males. The level of physical activity in leisure was negatively associated. Among women, the increase in age, neck circumference, sitting time of more than 300 minutes, increased serum uric acid concentration and ultra-sensitive C reactive protein were associated with VAI. except for age, all other factors associated with VAI are modifiable, suggesting that adopting early intervention measures that promote changes in habits and alter the risk of increased visceral adiposity and consequently the appearance of comorbidities should be encouraged.

PHOSPHATE CRYSTALLURIA IN VARIOUS FORMS OF UROLITHIASIS AND POSSIBILITIES OF ITS PROGNOSTICATION IN PATIENTS WITH PHOSPHATE STONES

Purpose. Definition of types of crystalluria in various forms of urolithiasis and biochemical signs of phosphate crystals in the urine, while phosphate urolithiasis (infectious origin). Patients and methods. The study involved 144 patients with recurrent urolithiasis — 75 women and 69 men. Of these, 46 — diagnosed calculi with uric acid, 44 — calcium oxalate or mixed with a prevalence of calcium oxalate, in 54 — phosphate rocks (carbonate-apatite and/or struvite). The age of patients ranged from 21 to 74 years. 93 people have been under long-term, within 2–15 years, outpatient observation. The examination included the collection of anamnesis, general and microbiological analysis of urine, biochemical blood serum and urine on 10 indicators, reflecting renal function, state of the protein, water and electrolyte metabolism, uric acid metabolism, the chemical composition of the stone analysis. Results. It was found that in patients with calcium oxalate stones phosphaturia has been diagnosed in 2% of cases. And, along with calcium phosphate crystals they had oxalate crystals. In patients with phosphate urolithiasis phosphaturia observed in 96% of patients, in two patients (4%) they determined except phosphates also oxalate salt in urine sediment. Patients with phosphate urolithiasis at occurrence of phosphate crystalluria have metabolic state changes: increased serum uric acid concentration from 0.322 ± 0.009 to 0.367 ± 0.018 mmol/l daily renal excretion of inorganic phosphate 23.94 ± 2.93 mmol/day to 32.12 ± 4.39 mmol/day, and reduced total calcium content in urine 6.61 ± 0.94 mmol/day to 3.37 ± 0.89 mmol/day. The results led to the following conclusion. Conclusion. Biochemical signs of occurrence of phosphate crystalluria in patients with stones of infectious origin can be: the approaching level of excretion in the urine of inorganic phosphates to 32,12 ± 4,39 mmol/day, serum uric acid concentration to 0,367 ± 0,018 mmol/l, and the total content of calcium in the urine to 3.37 ± 0.89 mmol/day

Cross-sectional and longitudinal associations between serum uric acid and metabolic syndrome: Results from Fangchenggang Area Male Health and Examination Survey in China

BackgroundIt is controversial whether serum uric acid (SUA) is a risk factor for the prevalence of metabolic syndrome (MetS). The current study was designed to highlight the association of SUA and MetS and its components. MethodsData on 3675 healthy male subjects, aged 17–88years, were collected for the cross-sectional study. A representative sample of 2575 individuals who did not suffer from MetS at baseline was involved in the cohort study. A cox regression model was applied to evaluate causality for the 2- and 4-year large scale longitudinal study. ResultsIn the cross-sectional analysis, SUA showed a statistically significant negative correlation with high-density lipoprotein cholesterol (HDL-c) and a positive correlation with blood pressure (BP), triglycerides (TG), waist circumference (WC), and body mass index (BMI) (all P<0.001). In longitudinal analysis, examining the risk of developing MetS, SUA concentrations (hazard ratios comparing fourth quartile to the first quartile of 1.75; 95% CI, 1.26–2.41) were positively associated with incident MetS after adjusted for age, blood pressure, glucose, TG, HDL-c, smoking, alcohol drinking and education. ConclusionSUA is positively correlated with the prevalence of MetS. Increased SUA concentration may be an independent risk factor for MetS.

Association between fructose, uric acid and blood pressure

Sugars, and in particular fructose, consumption has been associated with increased systolic and diastolic blood pressure (BP), mediated by increased serum uric acid concentration, which interferes with the renin‐angiotensin mechanism and inhibits nitric oxide release from endothelial cells. Uric acid can also increase sodium sensitivity.Investigating associations between dietary sugars and health endpoints is difficult because of measurement error in self‐reported intake. Dietary biomarkers may help us elucidate true associations.We have assessed total sugars and total fructose intake (including fructose from sucrose) in a cross‐sectional analysis of 1366 participants (624 men, 742 women), 39 – 77 years of age, of the Norfolk cohort of the European Prospective Investigation into Cancer (EPIC) study using 7‐day diaries and sucrose and fructose measured in spot urines, as biomarkers of sugars intake. Other study measurements include serum uric acid and BP. Associations were investigated using linear regression analyses with log‐transformed variables, stratified by sex and adjusted for age and BMI. Urinary concentrations were adjusted by specific gravity.Total sugars consumption (mean ± SD) was 111.7 ± 40.3 g/d, of which 44.3 ± 17.9 g/d was total fructose. Serum uric acid was 344 ± 66 µM. Serum uric acid concentration was not associated with systolic BP in men and women. Intake of total sugars and total fructose assessed by 7‐d diary or biomarker was not significantly associated with serum uric acid or with BP.Our results do not support an association between fructose intake and increased BP. Adjusted (age, BMI) systolic BP mm Hg (mean, 95% CI) by quintile of total fructose intake in 624 men and 742 women of EPIC Norfolk. Intake was measured by biomarker (urinary fructose) and 7DD (adjusted for total energy intake). Men (n=624) Women (n=742) Intake Biomarker 7DD Biomarker 7DD Q1 137.4 (136.3; 138.6) 136.9 (135.9; 138.0) 132.2 (131.0; 133.5) 131.2 (129.9; 132.6) Q2 136.7 (135.6; 137.8) 137.1 (135.8; 138.3) 132.7 (131.4; 134.0) 131.8 (130.5; 133.1) Q3 136.9 (135.7; 138.0) 137.1 (135.9; 138.3) 132.5 (131.3; 133.8) 133.5 (132.2; 134.8) Q4 137.4 (136.2; 138.5) 136.8 (135.6; 138.1) 132.3 (131.0; 133.6) 132.2 (130.8; 133.5) Q5 137.0 (135.8; 138.2) 137.5 (131.7; 132.9) 131.8 (130.3; 133.2) 132.9 (131.7; 134.0)

Metabolic syndrome, alcohol consumption and genetic factors are associated with serum uric acid concentration.

ObjectiveUric acid is the end product of purine metabolism in humans, and increased serum uric acid concentrations lead to gout. The objective of the current study was to identify factors that are independently associated with serum uric acid concentrations in a cohort of Czech control individuals.MethodsThe cohort consisted of 589 healthy subjects aged 18–65 years. We studied the associations between the serum uric acid concentration and the following: (i) demographic, anthropometric and other variables previously reported to be associated with serum uric acid concentrations; (ii) the presence of metabolic syndrome and the levels of metabolic syndrome components; and (iii) selected genetic variants of the MTHFR (c.665C>T, c.1286A>C), SLC2A9 (c.844G>A, c.881G>A) and ABCG2 genes (c.421C>A). A backward model selection procedure was used to build two multiple linear regression models; in the second model, the number of metabolic syndrome criteria that were met replaced the metabolic syndrome-related variables.ResultsThe models had coefficients of determination of 0.59 and 0.53. The serum uric acid concentration strongly correlated with conventional determinants including male sex, and with metabolic syndrome-related variables. In the simplified second model, the serum uric acid concentration positively correlated with the number of metabolic syndrome criteria that were met, and this model retained the explanatory power of the first model. Moderate wine drinking did not increase serum uric acid concentrations, and the urate transporter ABCG2, unlike MTHFR, was a genetic determinant of serum uric acid concentrations.ConclusionMetabolic syndrome, moderate wine drinking and the c.421C>A variant in the ABCG gene are independently associated with the serum uric acid concentration. Our model indicates that uric acid should be clinically monitored in persons with metabolic syndrome.

The association of albuminuria with tubular reabsorption of uric acid: results from a general population cohort.

BackgroundElevated albuminuria as well as an increased serum uric acid concentration is associated with poor cardiovascular outcome. We questioned whether these 2 variables (albuminuria and serum uric concentration) may be interrelated via tubular uric acid reabsorption.Methods and ResultsIncluded were 7688 participants of the PREVEND Study, an observational, general population‐based cohort study. Linear regression analyses were used to test associations of baseline albuminuria with baseline serum uric acid concentration and tubular uric acid reabsorption (calculated as [100−fractional uric acid excretion]%). Cox regression analyses were used to study the association of baseline serum uric acid and albuminuria with incident cardiovascular morbidity and mortality. In cross‐sectional analyses, albuminuria was associated positively with serum uric acid concentration, both crude and after adjustment for potential confounders (both P<0.001). Albuminuria was found to be associated positively with tubular uric acid reabsorption, again both crude and after adjustment for potential confounders (both P<0.001). In longitudinal analyses during a median follow‐up of 10.5 years, 702 cardiovascular events occurred. After adjusting for cardiovascular risk factors, both albuminuria and serum uric acid were associated with incident cardiovascular events (Hazard Ratios 1.09 [1.03 to 1.17], P=0.01 and 1.19 [1.09 to 1.30], P<0.001, respectively). A significant interaction between these variables was present (P<0.001), consistent with high serum uric acid being less predictive for cardiovascular morbidity and mortality in the presence of high albuminuria and vice versa.ConclusionsAlbuminuria is strongly associated with tubular uric acid reabsorption, and consequently with serum uric acid concentration. This phenomenon may explain in part why albuminuria is associated with cardiovascular outcome.

Association of serum uric acid level and body mass index between non alcoholic fatty liver disease patients and healthy volunteers

Background: Non-alcoholic fatty liver disease (NAFLD) is considered as a hepatic manifestation of the metabolic syndrome. Worldwide prevalence of NAFLD is 38%. Serum uric acid level has been suggested to be associated with factors that contribute to insulin resistance and metabolic syndrome. The aim of this study is to investigate the association of serum uric acid level and body mass index (BMI) with NAFLD. Methods: This observational study was conducted in subjects, who attended the master health checkup clinic of PSG Hospitals, Coimbatore, on 50 patients with NAFLD and 50 non fatty liver subjects. NAFLD was diagnosed based on the abdominal ultrasonographic findings. BMI and serum uric acid level were also measured in all the study participants. Uric acid quartiles were categorized into four groups, and the number of subjects, who came under each group, was noted. Results: The mean BMI (kg/m²) for cases was 27.01 ± 3.53 and the same for controls was 23.91 ± 3.11. Elevated BMI was associated with an increased incidence of NAFLD with a statistical significance ( p &lt; 0.05).The mean uric acid concentration (mg/dl) for cases was 5.73 ± 1.57, and for controls was 4.69 ± 0.91. Increased serum uric acid concentration was associated with an increased incidence of NAFLD with a statistical significance ( p &lt; 0.05). Conclusion: This study showed that elevated BMI is associated with an increased incidence of NAFLD. Serum uric acid levels are significantly associated with NAFLD, and high uric acid levels showed a high incidence of NAFLD compared to low serum uric acid level.