SGLT2 Inhibitors and Kidney and Cardiac Outcomes According to Estimated GFR and Albuminuria Levels: A Meta-analysis of Randomized Controlled Trials

Sodium-glucose cotransporter 2 (SGLT2) inhibitors and risk of chronic kidney disease-mineral and bone disorders in patients with type 2 diabetes mellitus and stage 1-3 chronic kidney disease

BACKGROUND

In patients with type 2 diabetes mellitus and chronic kidney disease (CKD), sodium-glucose cotransporter 2 (SGLT2) inhibitors improve renal outcomes, but may transiently affect biochemical markers of CKD-mineral and bone disorders (CKD-MBD). We sought to evaluate the long-term risk of CKD-MBD associated with use of SGLT2 inhibitors in this patient population.

METHODS

We conducted a retrospective cohort study, employing a target trial emulation framework and using electronic medical records of patients from 9 hospitals in Taiwan (2016-2023). We included adults with type 2 diabetes mellitus and stage 1-3 CKD who had newly started either an SGLT2 inhibitor or, as a comparison group, a glucagon-like peptide-1 receptor agonist (GLP-1 RA). The primary outcome was a composite of incident biochemical abnormalities (serum phosphate > 1.5 mmol/L, serum calcium < 2.1 mmol/L, serum intact parathyroid hormone [iPTH] > 6.9 pmol/L, or serum 25-hydroxyvitamin D < 49.9 nmol/L).

RESULTS

The cohort included 13 379 patients receiving SGLT2 inhibitors (n = 11 920) or GLP-1 RAs (n = 1459) with a median follow-up of 3.3 years. Compared with GLP-1 RAs, SGLT2 inhibitors were associated with a lower cumulative incidence of the composite primary outcome (hazard ratio [HR] 0.82, 95% confidence interval [CI] 0.79-0.86), hyperphosphatemia (HR 0.83, 95% CI 0.76-0.91), hypocalcemia (HR 0.82, 95% CI 0.78-0.86), high serum iPTH levels (HR 0.66, 95% CI 0.57-0.78), and low serum 25-hydroxyvitamin D levels (HR 0.65, 95% CI 0.47-0.90).

INTERPRETATION

Use of SGLT2 inhibitors was associated with a lower incidence of biochemical abnormalities related to CKD-MBD than GLP-1 RAs. These agents may be considered to reduce risk of CKD-MBD in patients with type 2 diabetes mellitus and stage 1-3 CKD.

Long-term effect of sodium-glucose cotransporter 2 inhibitors in kidney functions: A systematic review and meta-analysis

BACKGROUND

Sodium-glucose cotransporter 2 (SGLT2) inhibitors (such as dapagliflozin, empagliflozin, and canagliflozin) are essential for the treatment of type 2 diabetes because they improve the urine excretion of glucose. Although there are advantages, including weight loss and enhanced heart health, caution is necessary because of possible negative effects, such as higher urine output and euglycemic diabetic ketoacidosis. They may slow chronic kidney disease progression, therefore, renal function must be monitored. This study aims to determine the efficacy of SGLT2 inhibitors in the prevention of renal deterioration in terms of reduction of estimated glomerular filtration rate (eGFR) in patients with compromised renal functions.

METHODS

This study aimed to document the long-term effects of SGLT2 inhibitors on kidney function. PubMed and Google Scholar were the key sources of scholarly publications, and Boolean operators were used to perform exact searches. Nine articles were considered relevant out of a total of 244, following extensive screening of titles, abstracts, and full texts according to PRISMA recommendations.

RESULTS

This study included randomized, double-blind, placebo-controlled trials evaluating the long-term effects of SGLT2 inhibitors on renal function across patient demographics and locations. Clinical investigations showed different effects on eGFR across control and study groups, suggesting renal protection. A meta-analysis showed that SGLT2 inhibitors enhanced kidney function more than the controls.

CONCLUSION

This meta-analysis concluded that SGLT2 inhibitors have the potential to prevent eGFR reduction and improve renal function in patients with compromised renal function and underlying conditions such as chronic kidney disease or type 1 and 2 diabetes. However, this meta-analysis showed beneficial results in the prevention of renal deterioration within several follow-up periods, with an average of 11 to 12 months.

Is There a Role for SGLT2 Inhibitors in Patients with End-Stage Kidney Disease?

PURPOSE OF REVIEW

Chronic kidney disease and end-stage kidney disease (ESKD) are well-established risk factors for cardiovascular disease (CVD), the leading cause of mortality in the dialysis population. Conventional therapies, such as statins, blood pressure control, and renin-angiotensin-aldosterone system blockade, have inadequately addressed this cardiovascular risk, highlighting the unmet need for effective treatment strategies. Sodium-glucose transporter 2 (SGLT2) inhibitors have demonstrated significant renal and cardiovascular benefits among patients with type 2 diabetes, heart failure, or CKD at risk of progression. Unfortunately, efficacy data in dialysis patients is lacking as ESKD was an exclusion criterion for all major clinical trials of SGLT2 inhibitors. This review explores the potential of SGLT2 inhibitors in improving cardiovascular outcomes among patients with ESKD, focusing on their direct cardiac effects.

RECENT FINDINGS

Recent clinical and preclinical studies have shown promising data for the application of SGLT2 inhibitors to the dialysis population. SGLT2 inhibitors may provide cardiovascular benefits to dialysis patients, not only indirectly by preserving the remaining kidney function and improving anemia but also directly by lowering intracellular sodium and calcium levels, reducing inflammation, regulating autophagy, and alleviating oxidative stress and endoplasmic reticulum stress within cardiomyocytes and endothelial cells. This review examines the current clinical evidence and experimental data supporting the use of SGLT2 inhibitors, discusses its potential safety concerns, and outlines ongoing clinical trials in the dialysis population. Further research is needed to evaluate the safety and effectiveness of SGLT2 inhibitor use among patients with ESKD.

Slowing the progression of diabetic and non-diabetic kidney disease: A summary of the current evidence base for sodium-glucose co-transporter-2 inhibitors

The global prevalence of chronic kidney disease (CKD) is approximately 9%. CKD is predicted to become the fifth largest global cause of death by 2040. Moreover, CKD causes disability, diminished quality of life and poses a high cost to healthcare systems. Delaying the development and progression of CKD is therefore of the utmost importance. Several kidney-specific outcome trials on sodium-glucose co-transporter-2 inhibitors (SGLT-2s) have recently provided a paradigm shift in the treatment of people with CKD, with or without diabetes, as these agents have been shown to reduce the progression of CKD on top of maximally tolerated renin-angiotensin-aldosterone system (RAAS) blockade. The relative benefit and safety of SGLT-2is seems to be consistent across ethnicities, ages and frailty categories; however, this needs to be tested in dedicated clinical trials. Guidelines make clear recommendations for the prescription of SGLT-2is and RAAS inhibitors as standard of care for people with CKD. Their combination with other newer antidiabetic agents may provide further benefits by targeting different components of CKD mechanisms. Dedicated randomized controlled trials are needed to test whether combination with other agents could extend the use of SGLT2is and identify people in whom a combination of drugs may be most effective. Increased efforts to implement the guidelines on treatment with SGLT-2is for people with CKD are needed, particularly in those at the highest risk of adverse outcomes and without type 2 diabetes. Moreover, strategies to target the equitable use of SGLT-2is are needed.

Dapagliflozin cardiovascular effects on end-stage kidney disease (DARE-ESKD-2) trial: rationale and design

BACKGROUND

Dapagliflozin prevents myocardial dysfunction in chronic kidney disease patients regardless of residual kidney function. We hypothesized that this effect is extensible also to patients on dialysis.

RESEARCH DESIGN AND METHODS

The DARE-ESKD-2 is an ongoing, single-center, open-label randomized clinical trial designed to determine the effects of adding dapagliflozin to standard treatment on myocardial function and structure. Eligible patients were adults on a regular dialysis scheme for more than 3 months. Pregnancy, liver failure, allergy to the investigational drug, and prior use of SGLT2i were exclusion criteria. Participants were randomized in a 1:1 ratio to dapagliflozin or standard treatment groups for 24-weeks. The primary goal is to compare the change in NT-proBNP levels between study arms, and secondary goals include comparing the between-group difference in left ventricle global longitudinal strain, indexed mass, ejection fraction, and E/e` ratio, and on symptoms scale and 6-minute walk test distance. An exploratory analysis will evaluate changes in body composition and bone densitometry.

RESULTS

The trial has finished the enrollment of 80 patients, who are currently being followed-up.

CONCLUSIONS

This trial will provide novel data on myocardial effects of SGLT2i in dialysis recipients. Results from this study may provide evidence to support SGLT2i use in ESKD.

Association of Albuminuria With Chronic Kidney Disease Progression in Persons With Chronic Kidney Disease and Normoalbuminuria : A Cohort Study

BACKGROUND

Albuminuria is a major risk factor for chronic kidney disease (CKD) progression, especially when categorized as moderate (30 to 300 mg/g) or severe (>300 mg/g). However, there are limited data on the prognostic value of albuminuria within the normoalbuminuric range (<30 mg/g) in persons with CKD.

OBJECTIVE

To estimate the increase in the cumulative incidence of CKD progression with greater baseline levels of albuminuria among persons with CKD who had normoalbuminuria (<30 mg/g).

DESIGN

Multicenter prospective cohort study.

SETTING

7 U.S. clinical centers.

PARTICIPANTS

1629 participants meeting criteria from the CRIC (Chronic Renal Insufficiency Cohort) study with CKD (estimated glomerular filtration rate [eGFR], 20 to 70 mL/min/1.73 m2) and urine albumin-creatinine ratio (UACR) less than 30 mg/g.

MEASUREMENTS

Baseline spot urine albumin divided by spot urine creatinine to calculate UACR as the exposure variable. The 10-year adjusted cumulative incidences of CKD progression (composite of 50% eGFR decline or kidney failure [dialysis or kidney transplantation]) from confounder adjusted survival curves using the G-formula.

RESULTS

Over a median follow-up of 9.8 years, 182 of 1629 participants experienced CKD progression. The 10-year adjusted cumulative incidences of CKD progression were 8.7% (95% CI, 5.9% to 11.6%), 11.5% (CI, 8.8% to 14.3%), and 19.5% (CI, 15.4% to 23.5%) for UACR levels of 0 to less than 5 mg/g, 5 to less than 15 mg/g, and 15 mg/g or more, respectively. Comparing persons with UACR 15 mg/g or more to those with UACR 5 to less than 15 mg/g and 0 to less than 5 mg/g, the absolute risk differences were 7.9% (CI, 3.0% to 12.7%) and 10.7% (CI, 5.8% to 15.6%), respectively. The 10-year adjusted cumulative incidence increased linearly based on baseline UACR levels.

LIMITATION

UACR was measured once.

CONCLUSION

Persons with CKD and normoalbuminuria (<30 mg/g) had excess risk for CKD progression, which increased in a linear fashion with higher levels of albuminuria.

PRIMARY FUNDING SOURCE

None.

Use of SGLT2 Inhibitors vs GLP-1 RAs and Anemia in Patients With Diabetes and CKD

Importance

Sodium-glucose cotransporter 2 (SGLT2) inhibitors are associated with lower anemia risk, based on findings from post hoc analyses of the CREDENCE and DAPA-CKD trials; however, the effectiveness of SGLT2 inhibitors in a more generalizable type 2 diabetes (T2D) and chronic kidney disease (CKD) population, with active comparisons pertinent to current practice, is unknown.

Objective

To evaluate and compare anemia incidence between SGLT2 inhibitors and glucagon-like peptide-1 receptor agonists (GLP-1 RAs) among patients with T2D and CKD stages 1 to 3.

Design, Setting, and Participants

This retrospective cohort study used target trial emulation of an expanded CREDENCE and DAPA-CKD study framework. The study was conducted among adults with T2D and CKD initiating SGLT2 inhibitors or GLP-1 RAs between January 1, 2016, and December 31, 2021, with follow-up until December 31, 2022. The study was conducted at the Chang Gung Medical Foundation, the largest multi-institutional hospital system in Taiwan.

Exposures

Initiation of SGLT2 inhibitors or GLP-1 RAs.

Main Outcomes and Measures

The primary outcome was a composite of anemia outcomes, including anemia event occurrence (hemoglobin level <12-13 g/dL or International Statistical Classification of Diseases, Tenth Revision, Clinical Modification diagnosis codes) or anemia treatment initiation. Changes in hematological parameters, including hemoglobin level, hematocrit level, and red blood cell count, were evaluated during the follow-up period for as long as 3 years.

Results

The cohort included a total of 13 799 patients with T2D and CKD, initiating SGLT2 inhibitors (12 331 patients; mean [SD] age, 62.4 [12.3] years; 7548 [61.2%] male) or GLP-1 RAs (1468 patients; mean [SD] age, 61.5 [13.3] years; 900 [61.3%] male). After the median follow-up period of 2.5 years, patients receiving SGLT2 inhibitors had lower incidence of composite anemia outcomes (hazard ratio [HR], 0.81; 95% CI, 0.73-0.90) compared with those receiving GLP-1 RAs. SGLT2 inhibitors were associated with a lower incidence of anemia events (HR, 0.79; 95% CI, 0.71-0.87) but not with a lower rate of anemia treatment initiation (HR, 0.99; 95% CI, 0.83-1.19). Changes in hematological parameters for SGLT2 inhibitors and GLP-1 RAs throughout the 3-year follow-up period supported the primary analyses.

Conclusions and Relevance

In this multi-institutional cohort study with target trial emulation, SGLT2 inhibitors were associated with a decreased risk of composite anemia outcomes, especially anemia event occurrences. SGLT2 inhibitors may be considered as an adjunct therapy to reduce anemia incidence in patients with T2D and CKD.

Dapagliflozin cardiovascular effects on end-stage kidney disease (DARE-ESKD-2) trial: rationale and design

Purpose

Sodium glucose co-transporter 2 inhibitors (SGLT2i) remarkably reduced the incidence of hospitalization for heart failure and cardiovascular death of conservatively managed chronic kidney disease. We hypothesized that adding SGLT2i to standard treatment would yield cardiovascular benefits also in end-stage kidney disease (ESKD) individuals on dialysis.

Methods

The DARE-ESKD-2 Trial (NCT05685394) is an ongoing, single-center, open-label, controlled trial aimed at assessing the cardiovascular effects of dapagliflozin in ESKD on dialysis. Eligible patients are adults on renal replacement therapy for more than 3 prior to enrollment. Exclusion criteria encompass pregnancy, liver failure, and current use of a SGLT2i. After signing an informed consent form, participants are randomized 1:1 to either dapagliflozin 10mg PO plus standard treatment or standard treatment alone for 6 months. Echocardiogram, anthropometry, blood sample collection, 6-min walk test, gait speed, and Kansas City Cardiomyopathy Questionnaire (KCCQ), are performed at baseline and at study termination. Participants are contacted monthly during treatment for outcomes disclosure. The primary endpoint of our study is the between-groups differences in posttreatment changes in plasma levels of N-terminal pro-B natriuretic peptide. Secondary endpoints include the differences between groups in the changes of echocardiography measurements, cardiopulmonary tests performance, body composition. The incidence of safety endpoints will also be diligently compared between study arms.

Conclusion

The DARE-ESKD-2 trial will provide unprecedented data on the cardiovascular safety and efficacy of SGLT2i in ESKD individuals on dialysis. This study will pave the grounds for improving clinical outcomes of dialysis recipients.

Treatment effect heterogeneity following type 2 diabetes treatment with GLP1-receptor agonists and SGLT2-inhibitors: a systematic review

BACKGROUND

A precision medicine approach in type 2 diabetes requires the identification of clinical and biological features that are reproducibly associated with differences in clinical outcomes with specific anti-hyperglycaemic therapies. Robust evidence of such treatment effect heterogeneity could support more individualized clinical decisions on optimal type 2 diabetes therapy.

METHODS

We performed a pre-registered systematic review of meta-analysis studies, randomized control trials, and observational studies evaluating clinical and biological features associated with heterogenous treatment effects for SGLT2-inhibitor and GLP1-receptor agonist therapies, considering glycaemic, cardiovascular, and renal outcomes. After screening 5,686 studies, we included 101 studies of SGLT2-inhibitors and 75 studies of GLP1-receptor agonists in the final systematic review.

RESULTS

Here we show that the majority of included papers have methodological limitations precluding robust assessment of treatment effect heterogeneity. For SGLT2-inhibitors, multiple observational studies suggest lower renal function as a predictor of lesser glycaemic response, while markers of reduced insulin secretion predict lesser glycaemic response with GLP1-receptor agonists. For both therapies, multiple post-hoc analyses of randomized control trials (including trial meta-analysis) identify minimal clinically relevant treatment effect heterogeneity for cardiovascular and renal outcomes.

CONCLUSIONS

Current evidence on treatment effect heterogeneity for SGLT2-inhibitor and GLP1-receptor agonist therapies is limited, likely reflecting the methodological limitations of published studies. Robust and appropriately powered studies are required to understand type 2 diabetes treatment effect heterogeneity and evaluate the potential for precision medicine to inform future clinical care.

Pharmacokinetic Properties of Dapagliflozin in Hemodialysis and Peritoneal Dialysis Patients

BACKGROUND

Sodium-glucose cotransporter 2 (SGLT2) inhibitors attenuate incident cardiovascular outcomes, irrespective of baseline GFR, in conservatively managed CKD. As this condition inexorably progresses to demanding KRT, drug withdrawal is supported by the current lack of evidence of safety of SGLT2 inhibitors in dialysis.

METHODS

This study was a prospective, single-center, open-label trial ( ClinicalTrials.gov identifier: NCT05343078 ) aimed at assessing the pharmacokinetic properties and safety of dapagliflozin in patients with kidney failure on regular dialysis regimens compared with those with type 2 diabetes and age- and sex-matched controls with normal kidney function. Peripheral blood samples were collected from both groups every 30 minutes for 4 hours and again after 48 hours after ingestion of dapagliflozin 10 mg, which occurred immediately before dialysis session initiation in the kidney failure group. This protocol occurred in drug-naïve patients and again after six daily doses of dapagliflozin to assess whether the drug had accumulated. The plasma and dialysate levels of dapagliflozin at each time point were determined by liquid chromatography and used to calculate pharmacokinetics parameters (peak concentration [C max ] and area under the plasma concentration-versus-time curve) for each participant.

RESULTS

Dapagliflozin C max was 117 and 97.6 ng/ml in the kidney failure and control groups, respectively, whereas the corresponding accumulation ratios were 26.7% and 9.5%. No serious adverse events were reported for either group. Dapagliflozin recovered from dialysate corresponded to 0.10% of the administered dose.

CONCLUSIONS

In patients with kidney failure on dialysis, dapagliflozin was well tolerated, was slightly dialyzable, and had nonaccumulating pharmacokinetic properties.

CLINICAL TRIAL REGISTRY NAME AND REGISTRATION NUMBER

Pharmacokinetics and Dialyzability of Dapagliflozin in Dialysis Patients (DARE-ESKD 1), NCT05343078.

Precision medicine in type 2 diabetes: A systematic review of treatment effect heterogeneity for GLP1-receptor agonists and SGLT2-inhibitors

Background

A precision medicine approach in type 2 diabetes requires identification of clinical and biological features that are reproducibly associated with differences in clinical outcomes with specific anti-hyperglycaemic therapies. Robust evidence of such treatment effect heterogeneity could support more individualized clinical decisions on optimal type 2 diabetes therapy.

Methods

We performed a pre-registered systematic review of meta-analysis studies, randomized control trials, and observational studies evaluating clinical and biological features associated with heterogenous treatment effects for SGLT2-inhibitor and GLP1-receptor agonist therapies, considering glycaemic, cardiovascular, and renal outcomes.

Results

After screening 5,686 studies, we included 101 studies of SGLT2-inhibitors and 75 studies of GLP1-receptor agonists in the final systematic review. The majority of papers had methodological limitations precluding robust assessment of treatment effect heterogeneity. For glycaemic outcomes, most cohorts were observational, with multiple analyses identifying lower renal function as a predictor of lesser glycaemic response with SGLT2-inhibitors and markers of reduced insulin secretion as predictors of lesser response with GLP1-receptor agonists. For cardiovascular and renal outcomes, the majority of included studies were post-hoc analyses of randomized control trials (including meta-analysis studies) which identified limited clinically relevant treatment effect heterogeneity.

Conclusions

Current evidence on treatment effect heterogeneity for SGLT2-inhibitor and GLP1-receptor agonist therapies is limited, likely reflecting the methodological limitations of published studies. Robust and appropriately powered studies are required to understand type 2 diabetes treatment effect heterogeneity and evaluate the potential for precision medicine to inform future clinical care.

Plain language summary

This review identifies research that helps understand which clinical and biological factors that are associated with different outcomes for specific type 2 diabetes treatments. This information could help clinical providers and patients make better informed personalized decisions about type 2 diabetes treatments. We focused on two common type 2 diabetes treatments: SGLT2-inhibitors and GLP1-receptor agonists, and three outcomes: blood glucose control, heart disease, and kidney disease. We identified some potential factors that are likely to lessen blood glucose control including lower kidney function for SGLT2-inhibitors and lower insulin secretion for GLP1-receptor agonists. We did not identify clear factors that alter heart and renal disease outcomes for either treatment. Most of the studies had limitations, meaning more research is needed to fully understand the factors that influence treatment outcomes in type 2 diabetes.

Glycosylation of a key cubilin Asn residue results in reduced binding to albumin

Kidney disease often manifests with an increase in proteinuria, which can result from both glomerular and/or proximal tubule injury. The proximal tubules are the major site of protein and peptide endocytosis of the glomerular filtrate, and cubilin is the proximal tubule brush border membrane glycoprotein receptor that binds filtered albumin and initiates its processing in proximal tubules. Albumin also undergoes multiple modifications depending upon the physiologic state. We previously documented that carbamylated albumin had reduced cubilin binding, but the effects of cubilin modifications on binding albumin remain unclear. Here, we investigate the cubilin-albumin binding interaction to define the impact of cubilin glycosylation and map the key glycosylation sites while also targeting specific changes in a rat model of proteinuria. We identified a key Asn residue, N1285, that when glycosylated reduced albumin binding. In addition, we found a pH-induced conformation change may contribute to ligand release. To further define the albumin-cubilin binding site, we determined the solution structure of cubilin's albumin-binding domain, CUB7,8, using small-angle X-ray scattering and molecular modeling. We combined this information with mass spectrometry crosslinking experiments of CUB7,8 and albumin that provides a model of the key amino acids required for cubilin-albumin binding. Together, our data supports an important role for glycosylation in regulating the cubilin interaction with albumin, which is altered in proteinuria and provides new insight into the binding interface necessary for the cubilin-albumin interaction.

Albuminuria, estimated glomerular filtration rate, and traditional predictors for composite cardiovascular and kidney outcome: a population-based cohort study in Korea

Background

Methods

Results

Conclusion

Hypertension Management in Patients with Chronic Kidney Disease in the Post-SPRINT Era

The management of high blood pressure (BP) is crucial for improving outcomes in patients with chronic kidney disease (CKD). The updated Kidney Disease: Improving Global Outcomes 2021 BP guideline proposes treating adults with CKD to a target systolic BP (SBP) of <120 mmHg based on the standardized office BP measurement. This suggestion is largely based on the finding of SPRINT (Systolic Blood Pressure Intervention Trial) that targeting an SBP of <120 mmHg versus <140 mmHg is beneficial for cardiovascular and mortality outcomes, regardless of the patient's kidney disease status. However, extended follow-up studies of CKD trials showed that intensive versus usual BP control was associated with a lower risk of kidney failure in patients with, but not in those without, proteinuria. Similarly, a recent population-based study in Korea demonstrated that the optimal on-treatment BP for composite cardiorenal and mortality outcomes was left-shifted in adults with CKD, particularly in those with albuminuria, relative to that in patients without CKD. Moreover, in meta-analyses of randomized trials, more intensive versus standard BP control was associated with a lower risk of all-cause mortality in patients with CKD and albuminuria but not in those without CKD. Meanwhile, a 2020 Cochrane review reported that lower BP targets (≤135/85 mmHg), compared with standard targets (≤140/90 mmHg), resulted in a small reduction in cardiovascular events, an increase in other serious adverse events, and no reduction in total serious adverse events. Lowering SBP to <120 mmHg can potentially increase the risk of treatment-related adverse events beyond the cardioprotective benefits, and standardized BP measurement increases the burden on patients and resources. Thus, targeting a BP of <130/80 mmHg with appropriate office BP measurement can be an option in patients with CKD. The presence of albuminuria would need to be additionally considered to determine individualized BP targets.