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PMID: | 27110876 | Author: | Ibarra-Lara L; Del Valle-Mondragón L; Soria-Castro E; Torres-Narváez JC; Pérez-Severiano F; Sánchez-Aguilar M; Ramírez-Ortega M; Cervantes-Pérez LG; Pastelín-Hernández GS; Oidor-Chan VH; Zarco-Olvera G; Sánchez-Mendoza A | Address: | Department of Pharmacology, National Institute of Cardiology Ignacio Chávez, Mexico City, Mexico. | Title: | Peroxisome proliferator-activated receptor-α stimulation by clofibrate favors an antioxidant and vasodilator environment in a stressed left ventricle. | Source: | Pharmacol Rep; 68(4):692-702, 2016 Aug. | ISSN: | 1734-1140 | Country of publication: | Poland | Language: | eng | Abstract: | BACKGROUND: Arterial high blood pressure is a risk factor for target organ damage; the most susceptible organs are the arteries, brain, kidneys, and heart. The damage mechanisms include oxidative stress and renin-angiotensin system (RAS) overactivity. Therefore, our aim was to study whether clofibrate-induced peroxisome proliferator-activated receptor-alpha (PPAR-α) stimulation is able to prevent alterations in cardiac functioning derived from RAS overstimulation in the left ventricle of rats with hypertension secondary to aortic coarctation and to improve antioxidant defenses. METHODS: Male Wistar rats were assigned to Control (Sham)- or aortic coarctation-surgery and further divided to receive (1 or 21 days) vehicle, clofibrate (100mg/kg), captopril (20mg/kg), or clofibrate+captopril. The left ventricle was obtained to measure: angiotensin II and -(1-7), AT1 and AT2 receptors, angiotensin converting enzyme (ACE)-1 and -2, and MAS receptor; the activity and expression of superoxide dismutase, catalase, endothelial nitric oxide synthase, the production of reactive oxygen species (ROS) and peroxidated lipids; as well as ex vivo cardiac functioning. RESULTS: Clofibrate decreased angiotensin II, AT1 receptor and ACE expression, and raised angiotensin-(1-7), AT2 receptor, ACE-2 expression, superoxide dismutase and endothelial nitric oxide synthase participation. These effects promoted lower coronary vascular resistance and improved mechanical work compared to aortic coarctated vehicle-treated rats. CONCLUSIONS: Clofibrate-induced PPAR-α stimulation changes the angiotensin II receptor profile, favors the ACE2/angiotensin-(1-7)/AT2 receptor axis decreasing the vasoconstrictor environment, activates the antioxidant defense, and facilitates endothelial nitric oxide synthase activity favoring vasodilation. This may represent a protection for the stressed heart. | Publication type: | JOURNAL ARTICLE | Name of substance: | 0 (Antioxidants); 0 (PPAR alpha); 0 (Peptide Fragments); 0 (Proto-Oncogene Proteins); 0 (Reactive Oxygen Species); 0 (Receptor, Angiotensin, Type 1); 0 (Receptor, Angiotensin, Type 2); 0 (Receptors, G-Protein-Coupled); 0 (proto-oncogene proteins c-mas-1); 11128-99-7 (Angiotensin II); 9041-90-1 (Angiotensin I); 9G64RSX1XD (Captopril); EC 1.11.1.6 (Catalase); EC 1.14.13.39 (Nitric Oxide Synthase Type III); EC 1.15.1.1 (Superoxide Dismutase); EC 3.4.15.1 (Peptidyl-Dipeptidase A); EC 3.4.17.- (angiotensin converting enzyme 2); HPN91K7FU3 (Clofibrate); IJ3FUK8MOF (angiotensin I (1-7)) |
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