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- W2002145191 abstract "We wished to determine whether long-term treatment with organic nitrovasodilators has pharmacological effects on the development of atherosclerotic lesions and endothelial dysfunction in cholesterol-fed rabbits. For 15 weeks, six groups of 9 New Zealand White rabbits received a standard diet, which contained no admixture, pentaerythrityl-tetranitrate (PETN 6 mg/kg body weight/day), or isosorbide-5-mononitrate (ISMN 2 mg/kg body weight/day). In the other three groups, the same diets were further enriched with cholesterol (0,75%). Four rings of thoracic aorta were used for tension studies; these rings and the aortas from the aortic arch to bifurcation were then fixed in formol and stained with Sudan IV to determine the area of luminal atherosclerotic lesions by a computerized laser-scanning approach. The cholesterol diet increased plasma levels of cholesterol from 69.8 +/- 10.4 to 907.1 +/- 85.5 mg/dl. A similar result was obtained in the group receiving PETN/cholesterol, but the group fed ISMN/cholesterol showed a significantly higher plasma level of cholesterol (1,165 +/- 81.4 mg/dl). Plasma levels of PETN metabolites were still detectable by gas chromatography/mass spectrometry after a 24-h in vivo washout period. The cholesterol diet induced a pronounced degree of atherosclerotic lesions in the aortic arch and the thoracic and abdominal aorta: 73.3 +/- 1.9, 46.3 +/- 2.5, and 49.6 +/- 3.6%, respectively. Additional treatment with PETN resulted in a reduction of this atherosclerotic area to 58.6 +/- 2.05% (p < 0.0001), 34.7 +/- 1.98% (p < 0.01), and 39.3 +/- 3.06% (p < 0.05). In contrast, ISMN had no significant effect on this parameter. The cholesterol diet also induced an endothelial dysfunction as indicated by the diminished vasorelaxation induced by acetylcholine (ACh). Treatment with PETN completely inhibited the development of endothelial dysfunction, whereas ISMN had no effect. In the three groups receiving a cholesterol diet, an increased extent of aortic lesions significantly correlated with increased endothelial dysfunction measured in the same preparations. The long-term treatment with PETN did not affect the vasorelaxing potency of PETN in aortic rings, and similar results were obtained in the case of ISMN. We conclude that long-term treatment with doses of PETN, which do not promote the development of in vitro vascular nitrate tolerance, may protect against atherosclerosis and endothelial dysfunction. This novel, yet unknown pharmacodynamic quality of nitrovasodilators like PETN may contribute to their long-term efficacy in coronary artery disease but may also imply new therapeutic indications in the future." @default.
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- W2002145191 title "In Vivo Effects of Pentaerythrityl-Tetranitrate and Isosorbide-5-Mononitrate on the Development of Atherosclerosis and Endothelial Dysfunction in Cholesterol-Fed Rabbits" @default.
- W2002145191 doi "https://doi.org/10.1097/00005344-199505000-00012" @default.
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