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• W2133661556 abstract "The aim of this study was to investigate the activity of the parasympathetic limb of the baroreflex arch in a canine model of obesity-related hypertension. Twelve male beagle dogs were randomized into 2 groups. Six dogs were fed with normal canine food and 6 were submitted to a 10-week high-fat diet (HFD). We have evaluated the consequences of HFD on heart rate (HR) and blood pressure (BP) circadian cycles and methylscopolamine dose-response curves. Binding of [(3)H]-AF-DX 384 and adenylyl cyclase activity were investigated to determine the density and functionality of M(2)-cholinoceptors on right atrial membranes from control and HFD dogs. HFD induced a significant increase in body weight (15+/-1 vs 12+/-1 kg), systolic BP (161+/-5 vs 145+/-4 mm Hg), diastolic BP (92+/-3 vs 79+/-2 mm Hg), and HR (96+/-4 vs 81+/-3 bpm). Circadian rhythms of HR and BP observed in the baseline period were abolished after 9 weeks of HFD. After propranolol (1 mg/kg) pretreatment, the dose of methylscopolamine able to induce 50% maximum tachycardia was significantly increased after 9 weeks of HFD (7.4+/-0.3 vs 4.7+/-0.1 microg/kg). In the control group, the experimental period failed to modify these parameters. The numbers of M(2)-cholinoceptors measured in right atrial membranes were significantly lower in HFD than in control groups (54+/-6 vs 27+/-6 fmol/mg protein). The ability of carbachol to inhibit isoproterenol-stimulated adenylyl cyclase activity was significantly lower in HFD than in control groups (IC(50)=47+/-12 vs 6.4+/-1.4 micromol/L). However, the basal activity of adenylyl cyclase was unchanged by HFD. HFD decreases M(2)-cholinoceptor number and function in cardiomyocytes. This could explain the abolition of circadian rhythm of HR and the changes in chronotropic effect brought about by methylscopolamine." @default.
• W2133661556 created "2016-06-24" @default.
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• W2133661556 date "1999-11-01" @default.
• W2133661556 modified "2023-10-18" @default.
• W2133661556 title "Impaired Atrial M ₂ -Cholinoceptor Function in Obesity-Related Hypertension" @default.
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• W2133661556 doi "https://doi.org/10.1161/01.hyp.34.5.1066" @default.
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