Endothelium-dependent dilatation in response to ACh (control) of pressurized (100 mm Hg) renal arteries isolated from 6-month-old WT (n=8–14) (a), DL (n=7–13) (b) and DL+IVA (n=11–15) (c) mice. The effects of eNOS inhibition by L-NNA (10 μM) and the antioxidant NAC (1 μM) were tested in separate segments of renal arteries isolated from the same animal. DL+IVA mice were treated with ivabradine (IVA, 10 mg kg−1 day−1) from the age of 3–6 months. Data are mean±s.e.mean. ‡P<0.05 compared with the control. ACh, acetylcholine; DL, dyslipideamic; DL+IVA, dyslipidaemic mice treated with ivabradine; L-NNA, Nωnitro-L-arginine; NAC, N-acetyl-L-cysteine; WT, wild type.