Aldose reductase mediates endothelial cell dysfunction induced by high uric acid concentrations
- Zhiyong Huang†1, 2,
- Quan Hong†1,
- Xueguang Zhang3,
- Wenzhen Xiao3,
- Liyuan Wang1,
- Shaoyuan Cui1,
- Zhe Feng1,
- Yang Lv1,
- Guangyan Cai1,
- Xiangmei Chen1 and
- Di Wu1Email author
© The Author(s). 2017
Received: 21 January 2016
Accepted: 20 December 2016
Published: 5 January 2017
Uric acid (UA) is an antioxidant found in human serum. However, high UA levels may also have pro-oxidant functions. According to previous research, aldose reductase (AR) plays a vital role in the oxidative stress-related complications of diabetes. We sought to determine the mechanism by which UA becomes deleterious at high concentrations as well as the effect of AR in this process.
Endothelial cells were divided into three groups cultured without UA or with 300 μM or 600 μM UA. The levels of total reactive oxygen species (ROS), of four ROS components, and of NO and NOX4 expression were measured. Changes in the above molecules were detected upon inhibiting NOX4 or AR, and serum H2O2 and vWF levels were measured in vivo.
Increased AR expression in high UA-treated endothelial cells enhanced ROS production by activating NADPH oxidase. These effects were blocked by the AR inhibitor epalrestat. 300 μM UA decreased the levels of the three major reactive oxygen species (ROS) components: O2•-, •OH, and 1O2. However, when the UA concentration was increased, both O2•- levels and downstream H2O2 production significantly increased. Finally, an AR inhibitor reduced H2O2 production in hyperuricemic mice and protected endothelial cell function.
Our findings indicate that inhibiting AR or degrading H2O2 could protect endothelial function and maintain the antioxidant activities of UA. These findings provide new insight into the role of UA in chronic kidney disease.
KeywordsAldose reductase Endothelial cell dysfunction Uric acid Reactive oxygen species Hyperuricemia CKD
Uric acid (UA) is the final enzymatic product in the degradation of purine nucleosides and free bases in humans and the great apes [1–3]. UA is a powerful antioxidant that scavenges singlet oxygen (1O2) molecules, oxygen radicals, and peroxynitrite (ONOO−) molecules. UA also chelates transition metals to reduce ion–mediated ascorbic acid oxidation [4–7]. UA is responsible for approximately 50% of serum antioxidant activity [2, 4]. However, in vivo and cellular studies have demonstrated that depending on its chemical microenvironment, UA may also be a pro-oxidant . Strong epidemiological evidence suggests that the prevalence of gout and hyperuricemia is increasing worldwide . High UA levels are strongly associated with and often predict the development of hypertension, visceral obesity, insulin resistance, dyslipidemia, type II diabetes, kidney disease, and cardiovascular events [10, 11]. Although endothelial dysfunction generally occurs in the initial stages of these diseases, few studies on the effect of UA on human endothelial cells have been performed . UA dose-dependently decreases nitric oxide (NO) production in intact bovine aortic endothelial cells , and hyperuricemia induces endothelial dysfunction via mitochondrial Na+/Ca2+ exchange-mediated mitochondrial calcium overload . However, how the effects of UA become deleterious at high concentrations is unknown. Although the pathogenesis of these diseases is extremely complex and incompletely understood, oxidative stress clearly plays a central role. The urate oxidant-antioxidant paradox led us to investigate the point at which urate becomes an oxidant and the pathway through which this occurs. Although UA may have protective effects under certain conditions [15, 16], it cannot scavenge all radicals. Additionally, UA and/or its downstream radicals can trigger intracellular oxidant production via the ubiquitous NADPH oxidase-dependent pathway, thereby resulting in oxidative stress.
Aldose reductase (AR) is the rate-limiting enzyme in the polyol pathway, and NADPH acts as a cofactor . AR plays an important role in the pathogenesis of diabetic complications  and atherosclerosis . In diabetic rats, AR expression was increased, and inhibiting AR ameliorated renal function . The AR inhibitor epalrestat suppresses the progression of diabetic complications such as retinopathy, nephropathy and neuropathy . Genetic AR deficiency also prevented the progress of diabetic nephropathy . The elevation of AR may be related to higher oxidative stress levels in diabetic rats . In our previous research, AR expression was increased in endothelial cells treated with high uric acid concentrations . Increased substrate flux via AR leads to increased ROS production, cell injury, apoptosis, altered ion regulation, and mitochondrial dysfunction [25–31], and increased ROS production is associated with NADPH oxidase activation [32–34].
In this study, we detected the different ROS types generated in HUVECs cultured with different UA concentrations as well as the changes in ROS production upon transfecting HUVECs with siRNA against AR. We then investigated the role of AR in UA-induced endothelial injury in vitro and in vivo. Our results suggest a novel mechanism underlying the endothelial dysfunction caused by high UA levels.
Cell culture and uric acid preparation
Human umbilical vein endothelial cells (HUVECs) were purchased from YRbio (Cat#NC006, Changsha, China) and cultured in RPMI-1640 media supplemented with 10% fetal bovine serum (FBS) at 37 °C in a humidified incubator in a 5% CO2 atmosphere.
Uric acid was purchased from Sigma–Aldrich (Carlsbad, CA). Uric acid powder was dissolved in a 1 mol/L NaOH solution at a concentration of 40 mmol/L. Then, the uric acid solution was added to the serum containing medium at a final concentration and at a pH 7.2–7.4.
Intracellular reactive oxygen species (ROS) assays
Cells were seeded onto 35-mm confocal dishes (with a cover glass) and classified into control, normal uric acid (UA), and high uric acid (HUA) groups (n = 3). Cells in the UA and HUA groups were cultured in medium containing 300 or 600 μM uric acid, respectively, for 24 h followed by incubation with the total oxidative stress indicator chloromethyl derivative dichlorodihydrofluorescein diacetate (CM-H2DCFDA, Beyotime, Nanjing China, 5 μM) for 30 min in the dark at 37 °C. After three washes in PBS, green fluorescence was visualized using a laser scanning confocal microscope at an excitation wavelength of 488 nm and an emission wavelength of 515 nm.
Before HUA treatment, the HUA group was pretreated with 0.5 mM apocynin (Santa Cruz Biotechnology) or 0.1 μM epalrestat (Santa Cruz Biotechnology). Pyocyanin (100 μM; Sigma) was used as a positive control in the comparisons of ROS production.
Detection of intracellular ROS components
For the total intracellular ROS levels, method was referenced previously by the oxidant-sensing fluorescent probe CM-H 2 DCFDA . Briefly, this probe was loaded into previously subcultured HUVEC-Cs at a final concentration of 10 μmol/L, and the cells were then cultured for 30 min at 37 °C. After incubation, the culture medium was washed twice with PBS and analyzed by laser confocal microscopy with an excitation wavelength of 488 nm and an emission wavelength of 515 nm.
The detection of intracellular ROS components occurred as follows. For O2 •−(Mitochondrial): cells were incubated with 4 μmol/L Mito-SOX Red (Invitrogen) in the dark at 37 °C for 10 min, and red fluorescence was observed at an excitation wavelength of 510 nm and an emission wavelength of 580 nm. For H2O2: cells were incubated with 30 μmol/L BES-H2O2 (Seebio, China) in the dark at 37 °C for 1 h, and green fluorescence was observed at an excitation wavelength of 485 nm and an emission wavelength of 515 nm. For · OH: cells were incubated with 100 μmol/L proxylfluorescamine (Invitrogen) in the dark at 37 °C for 30 min, and green fluorescence was observed at an excitation wavelength of 488 nm and an emission wavelength of 520 nm. For 1O2: cells were incubated with 20 μmol/L trans-1-(2′-methoxyvinyl)pyrene (Invitrogen) in the dark at 37 °C for 10 min, and blue fluorescence was observed at an excitation wavelength of 405 nm and an emission wavelength of 460 nm. For ONOO−: cells were incubated with 10 μmol/L dihydrorhodamine123 (Santa Cruz) in the dark at 37 °C for 30 min, and green fluorescence was observed at an excitation wavelength of 488 nm and an emission wavelength of 520 nm.
Generation of inducible and stable cell lines
Reverse transcription was carried out on human kidney RNA with Superscript II reverse transcriptase, according to the manufacturer’s instructions. The full-length human NOX4 was amplified by PCR using the primers NOX4_F, 5′-GGGGACAAGTTTGTACAAAAAAGCAGGCTTCACCATGGCTGTGTCCTGGAGG-3′, and NOX4_R, 5′-GGGGACCACTTTGTACAAGAAAGCTGGGTCTCA GCTGAAAGACTCTTTATTGTATTC-3′. The PCR product was cloned into a pcDNA3.1 vector according to the manufacturer’s instructions, obtained pcDNA-NOX4. HUVECs were transfected with the pcDNA-NOX4 plasmid using Lipofectamine 2000 (Invitrogen). Clones were selected 10–16 days after transfection using 400 μg/ml neomycin (G418) to obtain HUVECs stably expressing NOX4.
Measurement of nitric oxide levels in culture supernatants or serum
Before treatment with chemicals or UA, media were replaced with Dulbecco’s modified Eagle’s medium (DMEM). The supernatant or serum was centrifuged and subjected to NO level evaluation using the Nitric Oxide Assay Kit (Applygen Technologies, China) according to the manufacturer’s instructions. The end-point measured formula was NO2 − ..
RNA was extracted from tissues and cells using TRIzol reagent (Invitrogen) and reverse transcribed into cDNA using M-MLV reverse transcriptase (Invitrogen). The cDNA was used as a template in quantitative real-time PCR reactions performed using SYBR green I PCR Master Mix and an ICycler system (Bio-Rad). The following primers were designed from the full-length AR and Nox4 mRNA sequences and synthesized by SBS Biotechnology Corporation (Beijing, China): AR sense, 5′- CCTATGGCCAAGGACACACT-3′ and antisense, 5′-CTGGTCTCAGGCAAGGAAAG-3′; NOX4 sense, 5′-TTGCCTGGAAGAACCCAAGT -3′ and antisense, 5′- TCCGCACAATAAAGGCACAA-3′. As an internal control, mouse GAPDH was amplified using the following primers: sense, 5′-GGCATGGACTGTGGTCATGAG-3′ and antisense, 5′-TGCACCACCAACTGCTTAGC-3′. Relative expression (fold change vs. control) was quantified using the 2-ΔΔCt method.
For Western blotting, proteins were extracted from tissues or cells using RIPA lysis buffer (50 mM Tris-HCl, pH 7.5, 150 mM NaCl, 0.5% deoxycholate, 1% Nonidet P-40, 0.1% SDS, 1 mM PMSF, and protease cocktail at 1 μg/ml). Protein concentrations were measured using a BCA kit (Pierce). Protein samples (60 μg per lane) were separated by 12% SDS-PAGE and transferred to nitrocellulose (NC) membranes. After staining with Ponceau S, the membranes were incubated overnight at 4 °C in 5% non-fat milk followed by incubation with a primary antibody against AR (Santa Cruz Biotechnology) or β-actin (Sigma). Immunoreactive bands were visualized using ECL reagent (Santa Cruz Biotechnology) according to the manufacturer’s instructions and were then exposed to X-ray film. Protein band intensities were quantified using the Quantity One software (Bio-Rad). The assay was repeat 3 times.
Aldose reductase activity assays
AR activity was measured spectrophotometrically as previously described [35, 36]. Briefly, AR activity was measured as the decrease in the absorbance of NADPH at 340 nm using DL-glyceraldehyde as the substrate. The assay mixture contained 30 mM potassium phosphate buffer (pH 6.5), 5 mM DL-glyceraldehyde, 0.2 M ammonium sulfate, and 1.0 mM NADPH. The results are presented as μmol NADPH · min-1 · g-1 protein. All reagents were from Sigma. The assay was repeat 3 times.
Establishment of hyperuricemic mouse models
Hyperuricemic mouse models were established as described by Yang et al.  with slight modifications. The animal protocol was reviewed and approved by the Institutional Animal Care and Use Committee of the Chinese PLA General Hospital. Wild-type C57BL/6 mice obtained from the Experimental Animal Center of the Academy of Military Medical Sciences (China) were used as controls. The mice were housed in temperature-controlled cages on a 12-h light-dark cycle and given free access to water and normal chow. After one week of breeding for adaptation, the mice were grouped into control (n = 6) and hyperuricemic model (n = 24) groups. Mice were intraperitoneally injected with 250 mg/Kg · d oxonic acid potassium salt (Sigma) and 250 mg/Kg · d uric acid (Sigma). After receiving intraperitoneal injections for 3 days, the hyperuricemic model group was sub-classified into hyperuricemic mice (n = 6), hyperuricemic mice treated with epalrestat (100 mg/Kg · d, Dyne, China) (n = 6), and hyperuricemic mice treated with polyethylene glycol catalase (PEG-catalase, 12000 U/Kg · d, Sigma) (n = 6). The antioxidant treatments PEG-catalase and epalrestat were intragastrically administered. After 10 days of modeling, the levels of UA, NO, H2O2, and von Willebrand factor (vWF) in the blood were evaluated.
Measurement of serum UA, H2O2 and vWF levels
The serum UA level was assayed using an enzymatic method that measures the end production of quinonimine using an automatic biochemical analyzer (Hitachi, Japan). Serum H2O2 levels were assayed using a hydrogen peroxide assay kit (NJJCbio, Nanjing, China) with the end formula Mn2+. vWF was detected using a von Willebrand Factor ELISA kit.
All data are expressed as the means ± SD. Mean comparisons among multiple groups were conducted using one-way analysis of variance (ANOVA). Comparisons of the means between two groups were conducted using randomized controlled t-tests. A p value < 0.05 was considered statistically significant.
High UA increased intracellular ROS production, AR activity and endothelial cell impairment but decreased NO release
High UA increased AR expression via p38/MAPK pathway
Increased AR expression enhances ROS production by activating NADPH oxidase
High UA impaired endothelial cells by enhancing H2O2 production but inhibited other ROS components
After high UA treatment, O2 •− and H2O2 levels increased. Although O2 •− is highly dynamic, it soon became disproportionate to H2O2. Therefore, we inferred that H2O2 is the major ROS contributor to endothelial cell impairment induced by high UA treatment. H2O2 levels significantly decreased in endothelial cells pretreated with epalrestat followed by high UA treatment, but ONOO− levels did not change (Fig. 4b). When PEG-catalase was applied to eliminate intracellular H2O2, total intracellular ROS levels were reduced, and NO levels increased compared with the high UA group that did not receive PEG-catalase treatment (Fig. 4c, d).
PEG-catalase and AR inhibitor epalrestat reduce H2O2 production in hyperuricemic mice and effectively protect mouse endothelial cell function
Uric acid (UA), which is generated in mammalian systems as an end product of purine metabolism, is the most abundant antioxidant in human plasma and possesses free radical scavenging properties. In humans and other higher primates, uric acid is the final compound of purines catabolism, but all other mammals converts uric acid to allantoin with enzyme uricase which is deficient in humans and other higher primates , and is the main reason why serum UA levels in adult males are 350 μmol/L, compared with the majority of mammals who have UA levels <30–60 mg/dl . Evidence has demonstrated Western diet could elevate serum uric acid . However, it may also act as a pro-oxidant under oxidative stress conditions. Markedly increased UA levels cause gout and nephrolithiasis , and high UA concentrations are also associated with an increased risk of developing cardiovascular disease (CVD), particularly hypertension, obesity/metabolic syndrome, and kidney disease [10, 11, 48–51]. Jia et al. verified hyperuricemia is related with the development of obesity/metabolic cardiomyopathy . However, the role of UA in CVD pathogenesis is still debated. UA is one of the most important antioxidants in body fluids and effectively eliminates ROS . Other risk factors exist in CVD patients in addition to the superoxide generation that accompanies UA production by xanthine oxidoreductase . Whether UA is a causative risk factor or plays a protective role with respect to its antioxidant properties is not known [54, 55]. The mechanism (s) by which UA acts as a “double-edged sword” remain to be determined.
Mounting evidence indicates that hyperuricemia induces heart and kidney injury by promoting free radical generation and subsequent endothelial dysfunction , which are regulated by NO bioavailability and activity changes [57, 58]. UA possesses the potential to downregulate NO production and induce endothelial injury through at least three mechanisms, namely modulating the eNOS phosphorylation status, potentiating arginase activity, and increasing intracellular superoxide levels . Because UA is a powerful free radical scavenger, we first investigated changes in levels of the major free radicals in the presence of different UA concentrations in the endothelium. The four major cellular ROS components are Mito-O2 •-, ·OH, 1O2, and H2O2, all of which can be interconverted [38, 60–63]. Here, we observed that under normal UA concentrations (300 μM), UA suppresses O2 •-, ·OH, and 1O2 release and slightly increases H2O2. The slight increase in H2O2 levels (Fig. 4a) may not be harmful because low H2O2 concentrations can protect endothelial function [64, 65] and affect vasodilation . When the UA concentration was increased to 600 μM, 1O2 and · OH release remained suppressed, whereas O2 •- and H2O2 levels significantly increased. Because H2O2 is generated from reduced O2 •- by superoxide dismutase (SOD), high UA levels likely did not suppress O2 •- release but rather stimulated O2 •- generation. This result is similar to previous reports [3, 67]. Although it is not a free radical, we also measured ONOO− levels, − which is a highly toxic molecule that can cause harmful effects. Under normal conditions, the ONOO− level remains low due to the low level of O2 •- generation. However, if O2 •- generation is enhanced, ONOO− production also increases [68–70]. Because UA can scavenge ONOO−, ONOO− levels decreased in the presence of normal UA concentrations. The increase in ONOO− levels resulting from high UA treatment was likely due to elevated O2 •- levels. These results suggest that enhanced O2 •- generation plays a central role in high UA-induced endothelial dysfunction.
When an AR inhibitor was added to the high UA-treated HUVECs, total ROS levels significantly decreased, and NO levels recovered. AR-induced ROS production is associated with NADPH [32, 33]; our results also suggested the involvement of NOX4 activation, but not NOX2 (Additional file 1). Upon blocking NOX4 with apocynin, ROS levels decreased, and NO levels recovered. When NOX4 was overexpressed In AR-knockdown HUVECs overexpressing NOX4 treated with high UA, ROS production and NO levels were the inverse of those resulting from NOX4 overexpression alone. Additionally, the AR inhibitor epalrestat affected H2O2 but not ONOO− levels and increased NO levels. These results confirm that AR activation plays an important role in high UA-stimulated HUVECs.
The above results suggest that the high UA-induced increased O2 •- generation was associated with the switch of UA functioning as an antioxidant to a pro-oxidant in vitro. Because O2 •- is catalyzed to H2O2 by SOD in vivo, H2O2 is likely the major contributor to endothelial dysfunction. Additionally, serum UA levels correlate with plasma H2O2 in preeclampsia . Therefore, blocking AR, reducing H2O2, or decreasing O2 •- would protect the endothelium from high UA-induced injury. In this study, epalrestat and PEG-catalase recovered NO secretion levels and decreased vWF levels.
Previously, we measured blood pressure in hyperuricemic wild-type mice and reported no difference between the two groups (data not shown). Endothelial dysfunction resulting from hyperuricemia would not impact blood pressure in the two-week model. However, if the duration of exposure to high UA concentrations was extended, the accumulation of endothelial dysfunction would cause artery dysfunction and dysarteriotony. These data are similar to the report by Johnson et al. [51, 76].
Our study confirmed that the levels of ROS components changed in HUVECs cultured in media containing different UA concentrations. In particular, H2O2 significantly increased in the high UA group compared with the control group. The elevated ROS levels were reversed when AR was inhibited in vivo or in vitro. Thus, the pro-oxidant activity of UA when present at high concentrations likely plays an important role in endothelial dysfunction via AR.
- 1O2 :
- H2O2 :
Human umbilical vein endothelial cells
- O2 •- :
- ONOO− :
Reactive oxygen species
von Willebrand factor
This work was carried out and finished at the State Key Laboratory of Kidney Diseases(2011DAV00088).
This work is supported by the Chinese National Natural Sciences Foundation (No. 31170810 and 81470949), the Beijing NOVA Program (Z121107002512078) and by a grant (2013CB530800) from the National Basic Research Program of China (973 Program).
Availability of data and materials
Zhiyong Huang and Quan Hong: Acquisition of data, drafting of the article; Xueguang Zhang, Wenzhen Xiao, and Liyuan Wang: Analysis and interpretation of the data, and statistical expertise; Guangyan Cai, Xiangmei Chen and Di Wu: Conception and design of the study. Quan Hong, Xiangmei Chen and Di Wu: obtaining of funding; Shaoyuan Cui, Zhe Feng, Yang Lv: Administrative, technical, or logistic support; Shaoyuan Cui and Quan Hong: Provision of study materials; All of authors: final approval of the article.
Zhiyong Huang, M.D., Quan Hong, M.D., Xueguang Zhang, M.D., WenZhen Xiao, M.D., Liyuan Wang, M.D., Shaoyuan Cui, B.S., Zhe Feng, M.D., Yang Lv, M.D., Guangyan Cai, M.D., Xiangmei Chen, Ph.D & M.D., Di Wu, M.D.
The authors declare that they have no competing interests.
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All of authors content to publication.
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