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- W2604251565 abstract "Objective: Neprilysin inhibitors (NEPi) prevent the breakdown of natriuretic peptides, promoting vasodilation and natriuresis. However, they also increase angiotensin and endothelin-1 (ET1). This study compared the combination of an AT1 receptor antagonist (irbesartan, IRB) ± a low or a high dose of the NEPi thiorphan in renin-overexpressing, hypertensive TGR(mREN2)27 rats. Methods: TGR(mREN2)27 rats were treated for three weeks with vehicle, IRB (15 mg/kg.day) or IRB + thiorphan (0.1 or 1.0 mg/kg.day; TH0.1 and TH1.0). Hemodynamics were evaluated by telemetry, and vascular reactivity was determined in isolated mesenteric arteries (Mulvany myograph). Results: Baseline mean arterial blood pressure (MAP) was 168±3 mmHg. All treatments lowered MAP by ≈50 mmHg around day 4. After 7 days, MAP started to increase during treatment with IRB or IRB+TH1.0 (to 141±10 mmHg and 133±10 mmHg, respectively, on day 21), while MAP in rats treated with IRB+TH0.1 remained low at 104±5 mmHg on day 21. Heart weight/body weight ratio, cardiac ANP expression and myocyte size decreased only in the IRB+TH0.1 group. Plasma ET1 was increased only by TH1.0 versus IRB alone, and this increase was accompanied by an increase in renal sodium-hydrogen exchanger 3 (NHE3) protein expression: ET1-induced constriction was reduced by IRB+TH0.1 only. Vascular ET B R expression levels and studies with the ET1 type B receptor (ET B R) antagonist BQ788 revealed that this reduction was most likely due to ET B R upregulation. Conclusion: TH0.1 enhanced the blood pressure-lowering effects of irbesartan and diminished cardiac hypertrophy. Higher doses of thiorphan resulted in significant ET1 rises and renal NHE3 upregulation, thereby increasing blood pressure and sodium reabsorption. The simultaneously occurring upregulation of vasodilatory ET B R was insufficient to overcome this effect. Clearly therefore, too much NEPi on top of AT1 receptor antagonism might be harmful." @default.
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- W2604251565 date "2014-09-01" @default.
- W2604251565 modified "2023-09-24" @default.
- W2604251565 title "Abstract 507: Dual AT1 Receptor/Neprilysin (NEP) Inhibition (ARNI) vs. AT1 Receptor Blockade in TGR(mRen2)27 Rats: The More NEP Inhibition The Better?" @default.
- W2604251565 doi "https://doi.org/10.1161/hyp.64.suppl_1.507" @default.
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