1.
The plasma levels of atrial natriuretic peptide and brain natriuretic peptide in type 2 diabetes treated with sodium-glucose cotransporter-2 inhibitor.
Feng, X, Gu, Q, Gao, G, Yuan, L, Li, Q, Zhang, Y
Annales d'endocrinologie. 2020;(5):476-481
Abstract
PURPOSE The aim of this study was to determine the levels of atrial natriuretic peptide (ANP) and brain natriuretic peptide (BNP) after treatment with sodium-glucose cotransporter-2 (SGLT2) inhibitor or dipeptidyl peptidase-4 (DPP4) inhibitor in patients with type-2 diabetes inadequately controlled by insulin, and to determine whether variation in ANP levels can explain favorable cardiovascular outcome. METHODS We enrolled 56 patients, aged 18-80years, with type-2 diabetes inadequately controlled by insulin: i.e., HbA1c level 7.5-10.5% despite at least 8weeks' injectable insulin at a stable mean dose of 20-150IU daily, with or without no more than two oral antidiabetic agents. FINDINGS The 56 patients were randomized between 3 treatment groups: SGLT2 inhibitor (n=18), DPP4 inhibitor (n=19) and placebo (n=19). Patients who received SGLT2 inhibitor or DPP4 inhibitor treatment all showed significantly lower HbA1c levels, fasting blood glucose (FBG) levels and systolic blood pressure at 24weeks than controls. SGLT2 inhibitor treatment decreased ANP levels, BNP levels, systolic blood pressure and weight compared with placebo. Compared to those receiving DPP4 inhibitor, patients receiving SGLT2 inhibitor showed lower HbA1c levels (7.01 vs. 7.58%; P=0.03), ANP levels (28.41 vs. 43.03 pg/mL; P=0.00) and weight (66.14 vs. 71.76 kg; P=0.04) at 24weeks after adjusting for baseline values. The SGLT2 inhibitor group showed higher sodium concentrations than the placebo and DPP4 inhibitor groups (145.89 vs. 143.89 and 144.79 mmol/L, respectively; P=0.00 and P=0.04) at 24 weeks. ANP and BNP levels did not significantly correlate with HbA1c and blood glucose levels. IMPLICATIONS These results indicated that SGLT2 inhibitors may be superior to DPP4 inhibitors in reducing risk of cardiovascular disease in diabetic patients. The major study limitation was the small number of patients per group, which should be enlarged in further research.
2.
Mechanisms of Protective Effects of SGLT2 Inhibitors in Cardiovascular Disease and Renal Dysfunction.
Liu, B, Wang, Y, Zhang, Y, Yan, B
Current topics in medicinal chemistry. 2019;(20):1818-1849
Abstract
Type 2 diabetes mellitus is one of the most common forms of the disease worldwide. Hyperglycemia and insulin resistance play key roles in type 2 diabetes mellitus. Renal glucose reabsorption is an essential feature in glycaemic control. Kidneys filter 160 g of glucose daily in healthy subjects under euglycaemic conditions. The expanding epidemic of diabetes leads to a prevalence of diabetes-related cardiovascular disorders, in particular, heart failure and renal dysfunction. Cellular glucose uptake is a fundamental process for homeostasis, growth, and metabolism. In humans, three families of glucose transporters have been identified, including the glucose facilitators GLUTs, the sodium-glucose cotransporter SGLTs, and the recently identified SWEETs. Structures of the major isoforms of all three families were studied. Sodium-glucose cotransporter (SGLT2) provides most of the capacity for renal glucose reabsorption in the early proximal tubule. A number of cardiovascular outcome trials in patients with type 2 diabetes have been studied with SGLT2 inhibitors reducing cardiovascular morbidity and mortality. The current review article summarises these aspects and discusses possible mechanisms with SGLT2 inhibitors in protecting heart failure and renal dysfunction in diabetic patients. Through glucosuria, SGLT2 inhibitors reduce body weight and body fat, and shift substrate utilisation from carbohydrates to lipids and, possibly, ketone bodies. These pleiotropic effects of SGLT2 inhibitors are likely to have contributed to the results of the EMPA-REG OUTCOME trial in which the SGLT2 inhibitor, empagliflozin, slowed down the progression of chronic kidney disease and reduced major adverse cardiovascular events in high-risk individuals with type 2 diabetes. This review discusses the role of SGLT2 in the physiology and pathophysiology of renal glucose reabsorption and outlines the unexpected logic of inhibiting SGLT2 in the diabetic kidney.
3.
SGLT-2 Inhibitors and DPP-4 Inhibitors as Second-Line Drugs in Patients with Type 2 Diabetes: A Meta-Analysis of Randomized Clinical Trials.
Wang, K, Zhang, Y, Zhao, C, Jiang, M
Hormone and metabolic research = Hormon- und Stoffwechselforschung = Hormones et metabolisme. 2018;(10):768-777
Abstract
Sodium-glucose co-transporter 2 (SGLT-2) inhibitors and dipeptidyl peptidase 4 (DPP-4) inhibitors are both novel and second-line therapies in type 2 diabetes mellitus, yet no well-rounded comparison of these two drugs has been published. Upon searching randomized controlled trials in databases from inception to July 2018, we collected studies on the efficacy or safety of SGLT-2 inhibitors compared with those of DPP-4 inhibitors for the treatment of type 2 diabetes mellitus. A total of 12 randomized controlled studies including 4342 patients were included in this meta-analysis. Compared with DPP-4 inhibitors, SGLT-2 inhibitors achieved greater reductions in HbA1c (SMD -0.22; 95% CI: -0.30, -0.14; p=0.000) and fasting plasma glucose (SMD -0.48; 95% CI: -0.56, -0.41; p=0.000). In addition, these reductions increased with a prolonged treatment duration from 12 to 78 weeks. Geographically, significant reductions of SGLT-2 inhibitors in HbA1c and FPG were found in North America and Europe, but not in Asia. Furthermore, SGLT-2 inhibitors showed greater reductions in body weight (SMD -0.72; 95% CI: -0.81, -0.63; p=0.000) from baseline, with an increased incidence of genital infections (OR 4.49; 95% CI: 2.96, 6.83; p=0.000) and pollakiuria (OR 2.24; 95% CI: 1.05, 4.79; p=0.037) and a decreased incidence of hypertension and hyperglycemia. Overall, the current meta-analysis demonstrated that compared to DPP-4 inhibitors, SGLT-2 inhibitors have beneficial effects on HbA1c, FPG, body weight, SBP, DBP, and HDL-cholesterol in patients with type 2 diabetes. However, SGLT-2 inhibitors are associated with increased total cholesterol and LDL-cholesterol and a higher incidence of genital infections and pollakiuria.