Effects of dapagliflozin on serum uric acid levels in hospitalized type 2 diabetic patients with inadequate glycemic control: a randomized controlled trial
Authors Hao Z, Huang X, Shao H, Tian F
Received 4 September 2018
Accepted for publication 7 November 2018
Published 11 December 2018 Volume 2018:14 Pages 2407—2413
Checked for plagiarism Yes
Review by Single anonymous peer review
Peer reviewer comments 2
Editor who approved publication: Professor Deyun Wang
Zhaohu Hao,1,* Xiao Huang,2,* Hailin Shao,1 Fengshi Tian1,3
1Department of Metabolic Disease Management Center, Tianjin 4th Central Hospital, Tianjin, China; 2NHC Key Laboratory of Hormones and Development (Tianjin Medical University), Tianjin Key Laboratory of Metabolic Diseases, Tianjin Medical University Metabolic Diseases Hospital and Tianjin Institute of Endocrinology, Tianjin Medical University, Tianjin, China; 3Department of Cardiology, Tianjin 4th Central Hospital, The 4th Central Hospital Affiliated to Nankai University, The 4th Center Clinical College of Tianjin Medical University, Tianjin, China
*These authors contributed equally to this work
Background: Raised serum uric acid (SUA) level is commonly observed in patients with type 2 diabetes mellitus (T2DM) and is associated with increased morbidity and mortality. Sodium-glucose cotransporter 2 inhibitor, a novel oral diabetic drug, might exert a potential hypouricemic effect. We evaluated the effects of dapagliflozin on SUA levels in hospitalized T2DM patients with inadequate glycemic control.
Methods: In this randomized controlled trial, 59 T2DM hospitalized patients with inadequate glycemic control were assigned to the dapagliflozin 10 mg group (n=29) or the control group (n=30). The primary outcome was changes in SUA levels from the baseline to good glycemic control. Additional outcomes included correlations between baseline SUA levels, urinary parameters, and the changes in SUA levels. This trial is registered in the Chinese Clinical Trial Registry (number ChiCTR1800015830).
Results: Compared to baseline level, SUA levels had significantly decreased in both groups (P<0.001 for the dapagliflozin group and P=0.013 for the control group). Mean changes from baseline in SUA levels for dapagliflozin vs the control group were 68.03 vs 25.90 µmol/L (P=0.0406). Adjusted mean SUA levels were lower in the dapagliflozin group (273.28 vs 307.57 µmol/L; P=0.0089). In T2DM patients treated with dapagliflozin, the decrease in SUA levels was positively correlated with baseline SUA levels (P<0.0001) but not correlated with changes in 24-hour urine volume, 24-hour urine glucose, or 24-hour urinary uric acid.
Conclusion: Dapagliflozin could improve glycemic control and lower SUA levels in hospitalized patients with uncontrolled T2DM. Longer-time trials are required to further demonstrate the hypouricemic effect of dapagliflozin and explore the potential underlying mechanisms.
Keywords: serum uric acid, dapagliflozin, type 2 diabetes mellitus, 24-hour urinary uric acid, SGLT2 inhibitor
Uric acid is the end product of purine metabolism, which has dual characteristics of antioxidant activity and promoting oxidation. Imbalance in uric acid production and excretion could cause hyperuricemia, which is considered to be a well-established risk factor for gout, nephropathy, and nephrolithiasis.1,2 Recently, hyperuricemia has been reported to be related to other conditions including atherosclerosis, hypertension, and cardiovascular diseases.3–6 Hyperuricemia and type 2 diabetes mellitus (T2DM) are closely interrelated. On the one hand, higher serum uric acid (SUA) may increase the development of insulin resistance, impaired glucose tolerance, and T2DM.7–11 A previous study including 17,044 participants from China showed that increased uric acid level was associated with T2DM after adjusting for potential confounders.7 Another 15-year follow-up study suggested that compared with normal levels of SUA, hyperuricemia was independently related to 1.25 times of prediabetes, 1.36 times of insulin resistance, and 1.87 times of T2DM.10 On the other hand, renal dysfunction and hyperproduction of uric acid linked to hyperinsulinemia and insulin resistance in T2DM patients influenced the presence of hyperuricemia.12 In addition, hyperuricemia has been shown to be a risk factor for the progression of diabetic peripheral neuropathy, increased mortality rate, cancer incidence, atrial fibrillation, and metabolic syndrome in patients diagnosed with T2DM.13–16 Given the above adverse effects of hyperuricemia, it was proposed that lowering SUA level may benefit T2DM patients.
Sodium-glucose cotransporter 2 (SGLT2) inhibitor, a novel oral diabetic drug, can reduce blood glucose and improve glycemic control through an insulin-independent mechanism, and has been reported to be associated with a hypouricemic effect in patients with T2DM.17 Dapagliflozin was the first approved SGLT2 inhibitor for T2DM.18 Apart from glycemic control, beneficial effects including lowering of body weight, blood pressure reduction, and renal function protection have also been observed in T2DM patients taking dapagliflozin.19–22 In particular, dapagliflozin was reported to lower SUA levels in several studies.21,23–28 A review by Ahmadieh and Azar suggested a beneficial effect on uric acid levels following treatment by dapagliflozin.29 Notably, a recent meta-analysis of randomized control trials (RCTs) found a dose-dependent mode of dapagliflozin-induced hypouricemic effect from 5 to 50 mg and the combined effect of reduction was 36.99 (95% CI: 32.25–41.73) μmol/L.30
However, none of the studies included in the meta-analysis were specially designed to assess the uric acid-lowering effect of dapagliflozin. This study aims to evaluate the effect of dapagliflozin on SUA levels in hospitalized T2DM with inadequate glycemic control and to explore whether the potential underlying mechanisms were linked to baseline SUA levels and urinary parameters.
Study eligibility criteria
We recruited subjects with a primary diagnosis of T2DM aged ≥18 years from January 2018 to May 2018 in the endocrinology department of Tianjin 4th Center Hospital. Patients had to have adhered to their previous hypoglycemic programs for at least 3 months prior to hospitalization with inadequate glycemic control (glycosylated hemoglobin, HbA1c ≥8%). Patients should have abstained from alcohol for 1 week before hospitalization to the end of the study. Drugs such as aspirin, thiazide diuretics, fructose, niacin, vitamin C, atorvastatin, glucocorticoids, phenyl bromide malone, sodium bicarbonate, losartan, fenofibrate, reserpine, and amlodipine besylate that affected uric acid metabolism were prohibited.
Exclusion criteria were as follows: type 1 diabetes and other unusual types of diabetes; acute complications of diabetes, such as diabetic ketoacidosis or lactic acidosis; insufficient blood volume; subjects with diabetic nephropathy complications, rheumatic immune disease, pregnancy, malignant tumors, infection, foot ulcer, mental illness, thyroid dysfunction, severe liver and kidney dysfunction, anemia, heart failure, or respiratory insufficiency; mental illness, cognitive impairment, and patients lacking in self-care ability; and patients with a history of hyperuricemia or gout.
Subjects diagnosed with T2DM were randomized using a random number table to the treatment group (with dapagliflozin 10 mg; once daily in the morning) and the control group (without dapagliflozin). Increased doses of background antidiabetic agents in the control group were employed to achieve and maintain glycemic targets. Background antidiabetic agents included metformin, insulin, and glycosidase inhibitors. During the qualification period, medical records were accessed for baseline information including age, sex, body mass index (BMI), and smoking using a pro forma. Parameters such as fasting plasma glucose (FPG), 2-hour postprandial plasma glucose (PPG), HbA1c, duration of T2DM, and SUA levels prior to enrollment were also recorded. For patients eligible for this study, 24-hour urine volume, 24-hour urine glucose, and 24-hour urinary uric acid were measured 2 days after admission. The above laboratory indices were repeated 3 days after achieving good glycemic control during hospitalization. During the follow-up period, patients with hyperlipidemia were asked to avoid atorvastatin, fenofibrate, and other similar drugs, and patients with hypertension were asked to avoid amlodipine besylate and losartan. For eligible subjects who were at high risk for cardiovascular and cerebrovascular diseases, clopidogrel was administered after consultation with the Department of Cardiology or Neurology as necessary. Alcohol and fructose-containing drinks were strictly forbidden. Diet was based on the standard meal for T2DM patients provided by the hospital.
The primary outcome was SUA level changes from baseline to good glycemic control. The targets of blood glucose control were as follows: FPG is 4–7 mmol/L, PPG is 6–10 mmol/L, and no serious hypoglycemic events occurring during the study period. Additional outcomes included correlations between baseline SUA levels, urinary parameters, and the changes in SUA levels.
All clinical laboratory assessments for outcomes and safety parameters were determined using standardized methods by Tianjin 4th Center Hospital. This trial was approved by the institutional review board of Tianjin 4th Center Hospital and was conducted according to the Declaration of Helsinki. Before enrollment, all the patients meeting our study criterion signed informed consent forms (Trial registration code: ChiCTR1800015830).
All the analyses were performed using the SAS 9.4 software (SAS Institute Inc., Cary, NC, USA). P<0.05 was considered to suggest a statistically significant difference. For continuous variables, Kolmogorov–Smirnov Z-test was conducted. Once normal distribution and homogeneity of variance were satisfied, values were expressed as the mean ± SD and Student’s t-test was used to compare the difference between two groups. Otherwise, values were expressed as the median and rank sum test was used. For categorical variables, chi-squared test was performed. Paired Student’s t-test was used to explore the within-group difference in SUA levels, 24-hour urine volume, 24-hour urine glucose, and 24-hour urinary uric acid before and after intervention. An analysis of covariance model with an intervention group as an effect and baseline SUA levels as a covariate was performed. We further used linear regression and Pearson correlation analysis to test relationship between changes in SUA levels and baseline SUA levels, changes in 24-hour urine volume, 24-hour urine glucose, or 24-hour urinary uric acid.
Of 59 hospitalized participants who enrolled and completed the study, 29 were assigned to receive dapagliflozin 10 mg and continued the regimen throughout the whole study period (Figure 1). No patients were lost to follow-up. Demographic and baseline characteristics including age, sex, BMI, duration of T2DM, smoking history, HbA1c, 24-hour urine volume, 24-hour urine glucose, and 24-hour urinary uric acid were comparable between the two groups (Table 1). Average age was 57.77 years in the dapagliflozin group and 58.97 years in the control group (P=0.6890). The duration of T2DM was not significantly longer in the dapagliflozin group (12.20 years vs 9.47 years; P=0.0988). Baseline SUA levels were similar between the two groups (348.33±102.15 vs 326.21±103.39; P=0.4260).
Figure 1 The clinical trial flow chart.
Table 1 Demographic and baseline characteristics
At the end of the study when all participants achieved good glycemic control, FPG, PPG, and SUA levels significantly decreased in both groups (Table 2). In the dapagliflozin group, mean SUA levels dropped from 348.33 to 280.30 μmol/L and in the control group, mean SUA levels dropped from 326.21 to 300.31 μmol/L. Mean SUA level reduction from baseline was significantly greater for the dapagliflozin group than the control group (68.03 vs 25.90 μmol/L reduction; P=0.0406; Table 3). Adjusted mean SUA levels were lower in the dapagliflozin group (273.28 vs 307.57 μmol/L; P=0.0089; Table 4). However, the differences in mean change in FPG and PPG between groups were not statistically significant (P=0.8318 for FPG and P=0.9847 for PPG).
Table 2 Changes in FPG, PPG, and SUA levels before and after treatment in the two groups
Table 3 Comparisons of changes in FPG, PPG, and SUA levels between the dapagliflozin group and the control group
Table 4 Comparisons of adjusted mean SUA levels between the dapagliflozin group and the control group
Table 5 indicates the changes in urinary parameters in the dapagliflozin group. 24-hour urine volume, 24-hour urine glucose, and 24-hour urinary uric acid were significantly increased after taking dapagliflozin, while urine pH did not change. In T2DM patients treated with dapagliflozin, the decrease in SUA levels was correlated with baseline SUA levels (P<0.0001) but not correlated with changes in 24-hour urine volume, 24-hour urine glucose, or 24-hour urinary uric acid (Table 6). Simple linear regression analysis suggested that increased baseline SUA levels were associated with more SUA changes in the dapagliflozin group (P<0.001; Table 7) than in the control group (P=0.010).
Table 5 Changes in urinary parameters before and after treatment in the dapagliflozin group
Table 6 Pearson correlation analysis between changes in SUA levels and baseline SUA levels, changes in 24-hour urine volume, 24-hour urine glucose, or 24-hour urinary uric acid
Table 7 Linear regression between changes in SUA levels and baseline SUA levels
To the best of our knowledge, the present study is the first one that is designed to examine the effects of dapagliflozin on SUA levels in hospitalized patients with inadequately controlled T2DM. The results suggest that the addition of 10 mg dapagliflozin to treatment regimen resulted in comparable glycemic control and significantly reduced SUA levels in a hospital setting. In addition, for T2DM patients treated with dapagliflozin, the decrease in SUA levels was correlated with baseline SUA levels (P<0.0001) but not with changes in 24-hour urine volume, 24-hour urine glucose, or 24-hour urinary uric acid.
Dapagliflozin is an SGLT2 inhibitor that has been reported to significantly improve glycemic control as monotherapy or as an adjunct to other antihyperglycemic drugs including metformin, insulin, or sitagliptin with acceptable tolerability and safety through an insulin-independent mechanism in several RCTs.21,23,25,31–34 Underlying mechanisms might reduce glucose reabsorption in the proximal tubule and subsequently increase glucose excretion in the urine.35 In addition to hypoglycemic effect, dapagliflozin has been shown to have other benefits, including a tendency for improved cardiovascular outcomes, total body weight loss, blood pressure reduction, and lowering of SUA levels.19–28 The present study indicated improved glycemic control after treatment with dapagliflozin, although no significant difference was found between groups.
Our study suggested additional beneficial effects of dapagliflozin on SUA reduction, which was consistent with previously published studies.29,30 A mean reduction of 68.03 μmol/L of SUA levels was observed in the dapagliflozin group, with only 25.90 μmol/L reduction in the control group. The considerable reduction of SUA levels was similar to that shown in a meta-analysis, which revealed a 67.98 μmol/L mean reduction in SUA levels for the dapagliflozin 10 mg group.30 Moreover, higher dapagliflozin dose is associated with a greater SUA reduction (from 5 to 50 mg). In fact, to pool estimates from multiple RCTs can be challenging, as inclusion or exclusion criterion varied across these trials. For example, status was not clearly identified and included hyperuricemia, gout, or medications affecting SUA levels in majority of the included trials. These conditions were crucial for the assessment of SUA level changes induced by dapagliflozin. However, almost all studies have found a hypouricemic effect after administration of dapagliflozin, enabling reasonable combination of results from different trials.
The present study also found that decrease in SUA levels was correlated with baseline pre-intervention SUA levels. Potential mechanisms behind hypouricemic effect of dapagliflozin have not yet been established; however, the renal SLC2A9 transporter that transports both uric acid and D-glucose may be involved.36,37 SGLT2 inhibitors lead to sustained glucose loss in the urine accompanied by an increased interchange of uric acid in the lumen membrane of tubular epithelial cells, which subsequently causes increased uric acid excretion and lower SUA levels. However, this study failed to detect a correlation between changes in SUA levels and changes in 24-hour urine volume, 24-hour urine glucose, or 24-hour urinary uric acid. This nonsignificant result may be due to a small sample or short duration of follow-up. Besides, other mechanisms possibly played a role in the hypouricemic effect of dapagliflozin. Further trials and fundamental studies are needed to clarify such phenomena.
This is the first study specially focusing on hypouricemic effects of dapagliflozin in hospitalized patients with inadequately controlled T2DM. Hospitalized T2DM patients can be closely monitored for suitable diet and tested for various indicators. Meanwhile, good glycemic control was an important target for hospitalized T2DM patients, which may be linked to improved glycemic control after discharge.38,39 We excluded T2DM patients with renal insufficiency, a history of hyperuricemia or gout, whose SUA levels might have been altered by disease progression. The current study also has several limitations. First, except for dapagliflozin, other coadministered hypoglycemic agents potentiality affected SUA levels which may have had an influence on the results. Second, a relatively small sample size limits the generalization of the study and the conclusions need to be carefully interpreted. Third, data regarding changes in 24-hour urine volume, 24-hour urine glucose, and 24-hour urinary uric acid in the control group were not available, which resulted in failure to compare the difference in changes of these outcomes between groups. Finally, the study had a short duration of follow-up, and multiple measurements for indicators involved were not possible.
Dapagliflozin was shown to improve glycemic control and lower SUA levels in hospitalized T2DM patients with inadequate glycemic control. Given adverse effects associated with hyperuricemia, dapagliflozin was considered to provide additional benefits for hospitalized T2DM patients over other oral antidiabetic agents. The hypouricemic effect may not be attributable to the increase in the urinary excretion rate of uric acid. Longer-time trials are required to further illuminate the hypouricemic effect of dapagliflozin and its corresponding mechanisms.
This work was supported by the High-Priority Health Projects of Tianjin (16KG146); Tianjin Major Science and Technology Projects (17ZXMFSY00200). Zhaohu Hao and Xiao Huang are co-first authors for this study.
The authors report no conflicts of interest in this work.
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