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Open AccessArticle

Cardioprotection Conferred by Sitagliptin Is Associated with Reduced Cardiac Angiotensin II/Angiotensin-(1-7) Balance in Experimental Chronic Kidney Disease

1
Heart Institute (InCor), University of São Paulo Medical School, São Paulo 05403-900, SP, Brazil
2
Department of Nephrology (LIM 12), University of São Paulo Medical School, São Paulo 05403-900, SP, Brazil
3
Department of Internal Medicine, Federal University of Espírito Santo (UFES), Vitoria 29040-090, Espírito Santo, Brazil
*
Author to whom correspondence should be addressed.
These authors are equally contributed to this work.
Int. J. Mol. Sci. 2019, 20(8), 1940; https://doi.org/10.3390/ijms20081940
Received: 5 March 2019 / Revised: 15 April 2019 / Accepted: 18 April 2019 / Published: 20 April 2019
(This article belongs to the Special Issue Kidney Injury: From Molecular Basis to Therapies)
Dipeptidyl peptidase IV (DPPIV) inhibitors are antidiabetic agents that exert renoprotective actions independently of glucose lowering. Cardiac dysfunction is one of the main outcomes of chronic kidney disease (CKD); however, the effects of DPPIV inhibition on cardiac impairment during CKD progression remain elusive. This study investigated whether DPPIV inhibition mitigates cardiac dysfunction and remodeling in rats with a 5/6 renal ablation and evaluated if these effects are associated with changes in the cardiac renin-angiotensin system (RAS). To this end, male Wistar rats underwent a 5/6 nephrectomy (Nx) or sham operation, followed by an 8-week treatment period with the DPPIV inhibitor sitagliptin (IDPPIV) or vehicle. Nx rats had lower glomerular filtration rate, overt albuminuria and higher blood pressure compared to sham rats, whereas CKD progression was attenuated in Nx + IDPPIV rats. Additionally, Nx rats exhibited cardiac hypertrophy and fibrosis, which were associated with higher cardiac DPPIV activity and expression. The sitagliptin treatment prevented cardiac fibrosis and mitigated cardiac hypertrophy. The isovolumic relaxation time (IRVT) was higher in Nx than in sham rats, which was suggestive of CKD-associated-diastolic dysfunction. Sitagliptin significantly attenuated the increase in IRVT. Levels of angiotensin II (Ang II) in the heart tissue from Nx rats were higher while those of angiotensin-(1-7) Ang-(1-7) were lower than that in sham rats. This cardiac hormonal imbalance was completely prevented by sitagliptin. Collectively, these results suggest that DPPIV inhibition may delay the onset of cardiovascular impairment in CKD. Furthermore, these findings strengthen the hypothesis that a crosstalk between DPPIV and the renin-angiotensin system plays a role in the pathophysiology of cardiorenal syndromes. View Full-Text
Keywords: dipeptidyl peptidase IV; 5/6 renal ablation; renin-angiotensin system; cardiorenal syndromes dipeptidyl peptidase IV; 5/6 renal ablation; renin-angiotensin system; cardiorenal syndromes
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Beraldo, J.I.; Benetti, A.; Borges-Júnior, F.A.; Arruda-Junior, D.F.; Martins, F.L.; Jensen, L.; Dariolli, R.; Shimizu, M.H.; Seguro, A.C.; Luchi, W.M.; Girardi, A.C.C. Cardioprotection Conferred by Sitagliptin Is Associated with Reduced Cardiac Angiotensin II/Angiotensin-(1-7) Balance in Experimental Chronic Kidney Disease. Int. J. Mol. Sci. 2019, 20, 1940.

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