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An additive effect of eplerenone to ACE inhibitor on slowing the progression of diabetic nephropathy in the db/db mice #MMPMID27186263
Zhou G; Johansson U; Peng XR; Bamberg K; Huang Y
Am J Transl Res 2016[]; 8 (3): 1339-54 PMID27186263show ga
Although blockade of the renin-angiotensin-system (RAS) has become standard therapy for diabetic nephropathy (DN), decline in kidney function towards end-stage renal disease is seen in many patients. Elevated plasma aldosterone often accompanies RAS blockade by a phenomenon known as ?aldosterone escape? and activates the mineralocorticoid receptor (MR). We therefore examined whether addition of the MR antagonist eplerenone to an ACEI would enhance the efficacy in slowing the progression of DN. Untreated uninephrectomized diabetic db/db mice developed progressive albuminuria and glomerulosclerosis between weeks 18 and 22, associated with decreased number of podocytes and increased renal expression of fibrotic markers. The therapeutic effect of eplerenone at 100 mg/kg BW/d on albuminuria, podocyte injury and renal fibrosis was similar to that of enalapril given alone at maximally effective doses. Adding eplerenone to enalapril resulted in further reduction in these measurements. Renal expressions of TNF-?, MCP-1, Nox2 and p47phox and renal TBARS levels, markers of inflammation and oxidative stress, were increased during disease progression in diabetic mice, which were reduced by eplerenone or enalapril given alone and further reduced by the two drugs given in combination. However, there were no treatment related effects on plasma K+. Our results suggest that eplerenone is effective in slowing the progression of DN in db/db mice and that the effect is additive to an ACEI. The addition of an MR antagonist void of effects on plasma K+ to an ACEI may offer additional renoprotection in progressive DN via blocking the effects of aldosterone due to escape or diabetes-induction.