Cardiovascular Drugs and Therapy

, Volume 32, Issue 2, pp 135–145 | Cite as

Combined SGLT2 and DPP4 Inhibition Reduces the Activation of the Nlrp3/ASC Inflammasome and Attenuates the Development of Diabetic Nephropathy in Mice with Type 2 Diabetes

  • Yochai Birnbaum
  • Mandeep Bajaj
  • Hsiu-Chiung Yang
  • Yumei Ye
ORIGINAL ARTICLE
  • 307 Downloads

Abstract

Bacground

Sodium–glucose cotransporter 2 (SGLT2) inhibitors and dipeptidyl peptidase-4 inhibitors (DPP4I) are used to treat type 2 diabetes (T2DM). DPP4 inhibitors (DPP4) attenuate Nlrp3 inflammasome activation in the kidney. SGLT2 inhibition reduces inflammation and attenuates the progression of diabetic nephropathy (DN). The effects of dapagliflozin (Dapa) on the activation of the Nlrp3 inflammasome and the combined effect of SGLT2 and DPP4 on T2DM-induced inflammasome activation and progression of DN have not been previously studied. We assessed whether Dapa attenuates the inflammasome activation and progression of DN in T2DM mice and whether these effects can be augmented by adding DPP4I saxagliptin (Saxa).

Methods and Results

Male BTBR ob/ob and wild-type (WT) mice received vehicle, Dapa, or Dapa+Saxa for 8 weeks. Serum BUN in the WT mice was 16.9 ± 0.8 mg/dl. It increased to 55.7 ± 2.8 mg/dl in the BTBR mice. Dapa alone reduced BUN to 31.4 ± 1.2 mg/dl. A greater effect was seen in the Dapa+Saxa combination (24.8 ± 0.8 mg/dl). Serum creatinine was 0.16 ± 0.02 and 1.01 ± 0.04 mg/dl in the WT and BTBR mice, respectively. Dapa and Dapa+Saxa attenuated the increase of creatinine to 0.65 ± 0.02 and 0.40 ± 0.03 mg/dl, respectively. Serum cystatin C was elevated in the BTBR mice (3.9 ± 0.1 vs. 0.6 ± 0.2 ng/ml) as compared to WT mice. Dapa (2.4 ± 0.1) and Dapa+Saxa (1.4 ± 0.1) attenuated this increase. Kidney weight was higher in the BTBR than that of WT mice. Dapa reduced the kidney/body weight ratio in the BTBR mice. Dapa+Saxa tended to have greater effect, but the difference was not significant. mRNA levels of NALP3, ASC, IL-1β, IL-6, caspase-1, TNF-α, collagen-1, and collagen-3 significantly increased in the kidneys of the BTBR compared to the WT mice. Dapa alone and to a greater extent, Dapa+Saxa, attenuated the activation of the inflammasome. Yet, the combination did not result in greater attenuation of the collagen-1 and collagen-3 mRNA levels. The P-AMPK/total AMPK ratio was lower in the BTBR mice than in the WT mice. Dapa and Dapa+ Saxa equally increased the ratio. Conclusions: Dapa attenuates T2DM-induced activation of the inflammasome and progression of DN in BTBR ob/ob mice. Adding Saxa to Dapa augmented attenuation of the inflammasome, but had no significant effect on kidney weight or collagen-1 and collagen-3 mRNA levels. Future clinical trials are necessary to study the effect of combined SGLT2 inhibitor and incretin therapy on renal outcomes in patients with T2DM.

Keywords

SGLT2 Type 2 diabetes Diabetic nephropathy AMPK Inflammasome 

Notes

Funding information

The study was funded by an investigator initiated grant from AstraZeneca and the John S. Dunn Chair in Cardiology Research and Education.

Compliance with Ethical Standards

Conflict of Interest

Dr. Ye received research grants from AstraZeneca and Boehringer Ingelheim. Dr. Bajaj received research grants from AstraZeneca, Boehringer Ingelheim, Eli-Lilly, Sanofi-Aventis and Novo Nordisk. Dr. Yang is an employee of AstraZeneca. Dr. Yochai Birnbaum receives research grants from AstraZeneca, and he is a speaker for AstraZeneca.

Research Involving Animals

Mice received humane care in compliance with the Guide for the Care and Use of Laboratory Animals published by the National Institutes of Health (NIH Publication No. 85-23, revised 1996). The protocol was approved by the University of Texas Medical Branch IACUC, Galveston, Texas, USA.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Section of Cardiology, Department of MedicineBaylor College of MedicineHoustonUSA
  2. 2.Section of Endocrinology, Department of MedicineBaylor College of MedicineHoustonUSA
  3. 3.Translational Science, CVMD iMED, AstraZenecaMölndalSweden
  4. 4.Department of Biochemistry and Molecular BiologyUniversity of Texas Medical BranchGalvestonUSA

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