Limited data exist on long-term effects of GLP-1 receptor agonists on kidney function and albuminuria in T2D. In ELIXA, a study of cardiovascular safety of lixisenatide (Lixi) over a median follow-up of 25 months in 6068 patients (pts) with T2D and an acute coronary event ≥180 days before screening, slower progression of urinary albumin-to-creatinine ratio (UACR) was seen with Lixi vs. placebo (Pbo). In a mixed-effect model with repeated measures for comparisons between treatment (Tx) groups of changes in UACR, the interaction between Tx and baseline (BL) UACR categories was significant (p<0.01). We assessed change in estimated glomerular filtration rate (eGFR, per the 4-variable modification of diet in renal disease formula) and UACR by BL albuminuria status. eGFR was not significantly different for Lixi vs. Pbo overall or by BL albuminuria status. UACR percent change from BL was lower for Lixi vs. Pbo in pts with micro- or macroalbuminuria (Table). In a Cox proportional hazards model adjusted for BL and on-trial HbA1c, Lixi was associated with 23% lower risk for first macroalbuminuria event in pts without BL macroalbuminuria (HR 0.77; 95% CI: 0.62, 0.96; p=0.0174). In conclusion, in pts with T2D and a recent acute coronary event, Lixi reduced UACR progression in pts with BL micro- or macroalbuminuria and was associated with lower incidence of macroalbuminuria beyond glycemic control. Disclosure M.A. Muskiet: Consultant; Self; Eli Lilly and Company, Novo Nordisk A/S. L. Tonneijck: Consultant; Spouse/Partner; Eli Lilly and Company. Y. Huang: Consultant; Self; Sanofi. M. Liu: Employee; Self; Sanofi. A. Saremi: Employee; Self; Sanofi US. H.L. Heerspink: Consultant; Self; AbbVie Inc., AstraZeneca. Advisory Panel; Self; Boehringer Ingelheim GmbH. Consultant; Self; Janssen Research & Development, Fresenius SE & Co. KGaA. Advisory Panel; Self; Merck & Co., Inc.. Consultant; Self; Mitsubishi Tanabe Pharma Corporation. D.H. van Raalte: Advisory Panel; Self; Sanofi. Research Support; Self; Sanofi, Boehringer Ingelheim GmbH. Advisory Panel; Self; Boehringer Ingelheim GmbH, Merck & Co., Inc., Novo Nordisk Inc.. Research Support; Self; AstraZeneca.
Introduction: Sodium-glucose cotransporter-2 inhibitors (SGLT2is) improve hard renal outcomes in type 2 diabetes (T2D) patients. An acute and reversible drop in eGFR that stabilizes over time, as with RAS inhibitors, suggests involvement of a beneficial renal hemodynamic mechanism. In hyperfiltering T1D patients, SGLT2i lowered GFR by increasing afferent arteriolar resistance, possibly by activating tubuloglomerular feedback. We studied the renal hemodynamic effects of SGLT2i dapagliflozin in T2D patients like those included in recent outcome trials. Methods: Forty-four T2D patients on metformin monotherapy, (62.9±7.0 years, HbA1c 7.38±0.63%, GFR 113±19 mL/min) were randomized to 12 weeks dapagliflozin 10mg (DAPA, n=24) or gliclazide 30mg (GLIC, n=20) QD to achieve glycemic equipoise. At baseline and week 12, GFR and renal plasma flow (RPF) were measured by gold-standard inulin and para-aminohippurate clearances. The measurements were performed 1) in the fasting state, 2) during clamped euglycemia (90 mg/dL) and 3) hyperglycemia (270 mg/dL). Renal vascular resistance (RVR) and filtration fraction (FF) were calculated using GFR, RPF, Ht and MAP. Afferent and efferent arteriolar resistances were estimated by Gomez’ equations. Results: HbA1C decreased similarly (0.47% with DAPA and 0.65% with GLIC; p=ns), while only DAPA significantly reduced MAP by approximately 6 mmHg. DAPA reduced GFR during all three conditions by 8.9 (p<0.01), 9.0 (p=0.01) and 13.4 mL/min (p<0.001), respectively, without altering RPF, thus also reducing FF. Importantly, DAPA lowered RVR and efferent arteriolar resistance. GLIC did not alter any renal hemodynamic variables. Conclusion: We confirm that SGLT2i induces beneficial renal hemodynamic changes in T2D beyond glycemic control that are characterized by reduced GFR and FF. However, in contrast to standing opinion, this is mediated by efferent arteriolar dilation rather than afferent arteriolar constriction. Disclosure E.J. van Bommel: None. M.A. Muskiet: Consultant; Self; Eli Lilly and Company, Novo Nordisk A/S, Sanofi. M.J. van Baar: None. M.H. Kramer: None. M. Nieuwdorp: Advisory Panel; Self; Caelus health. J.A. Joles: None. D.H. van Raalte: Advisory Panel; Self; AstraZeneca, Boehringer Ingelheim International GmbH, Merck Sharp & Dohme Corp., Sanofi. Research Support; Self; AstraZeneca, Boehringer Ingelheim International GmbH, Merck Sharp & Dohme Corp., Sanofi. Funding AstraZeneca Nederland BV
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