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Anti-Peroxynitrite Treatment Ameliorates Vasorelaxation of Resistance Arteries in Aging Rats: Involvement with Protection of Circulating Endothelial Progenitor Cells.
Journal of Cardiovascular Pharmacology 2016 July 17
Numerous studies have found that the age-associated structural and functional alterations in arteries were characterized by increased endothelial dysfunction. In this study, young (3 months), adult (9 months) and aging (20 months) male SD rats were randomly divided into six groups, including control groups and FeTMPyP (peroxynitrite scavenger) groups receiving saline and FeTMPyP respectively for 5 administrations once every 3 days via intraperitoneal injection. The aged-related proteins beta-galactosidase (β-gal), p53 and p16 as well as the nitrotyrosine and endothelium markers endothelial nitric oxide synthase (eNOS) and von Willebrand Factor (vWF) in vascular tissues were measured by immunohistochemistry. Endothelium-dependent vasorelaxation and endothelium-independent vasorelaxation of rat thoracic aortas and mesenteric arteries were measured by acetylcholine (ACh) and sodium nitroprusside (SNP), respectively. The amount of circulating endothelial progenitor cells (EPCs) was determined by flow cytometry. The endothelium-dependent/independent relaxation in mesenteric arteries and the amount of circulating EPCs (CD31/CD34) in peripheral blood of aging rats were reduced significantly compared with young and adult rats. Immunohistochemistry results showed that the nitrotyrosine levels and morphological damage in mesenteric arteries were increased significantly in aging rats. Adoption of peroxynitrite scavenger FeTMPyP intervention may not only improve the endothelium-dependent relaxation and the amount of circulating EPCs in aging rats, but also reverse endothelial injury. In conclusion, the present study demonstrates that enhanced nitrative stress may aggravate the endothelial injury and vascular dysfunction of resistance arteries in aging rats. Anti-peroxynitrite treatment can ameliorate the vasorelaxation, and may be involved with the protection of circulating EPCs.
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