Abstract
Objective: The renoprotective effect of sodium glucose cotransporter 2 inhibitor (SGL2i) has been reported in diabetic patients. Local renin-angiotensin-aldosterone system (RAAS) is activated in diabetes mellitus and hypertension. We examined the effects of SGL2i on the RAAS in the obese diabetic rats fed a high salt diet. Methods: Zucker-diabetic rats (ZDR) and control rats were fed a high or normal salt diet and were treated with canagliflozin for 8 weeks. Blood pressure (BP), blood glucose (BG), PRA, plasma aldosterone (PAC), urinary albumin excretion (UAE), urinary 8-hydroxy-2’-deoxyguanosine (8-OHdG), gene expression of angiotensinogen in the kidney were measured. Results: ZDR febd a high salt diet showed high BP, increased UAE and urinary 8-OHdG and elevated angiotensinogen mRNA levels. Treatment with canagliflozin significantly decreased BP, BG, UAE, urinary 8-OHdG and and renal angiotensinogen mRNA levels compared with control rats (p<0.05). Discussion and Conclusion: The closer mechanism of renoptotection of SGL2i in diabetes mellitus is unclear. We have reported that the repoprotective effects of type 2 angiotensin receptor antagonist or mineralocorticoid receptor blocker were partly due to the decreased RAAS in the kidney. Decreased renal RAAS by the treatment with canagliflozin may contribute to the renoprotection in DZR.
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