title: Olmesartan medoxomil treatment potently improves cardiac myosin-induced dilated cardiomyopathy via the modulation of ACE-2 and ANG 1-7 mas receptor.
abstract: Angiotensin converting enzyme-2 (ACE-2) is a monocarboxypeptidase that metabolises angiotensin (ANG)-II into angiotensin 1-7 (ANG 1-7), thereby functioning as a negative regulator of the renin-angiotensin system. We investigated whether treatment with ANG-II type 1 receptor blocker, olmesartan medoxomil is associated with the attenuation of cardiac myosin-induced dilated cardiomyopathy (DCM) through recently established new axis of ACE-2/ANG 1-7 mas receptor. DCM was elicited in Lewis rats by immunisation with cardiac myosin, and 28 days after immunisation, the surviving Lewis rats were divided into two groups and treated with either olmesartan medoxomil (10 mg/kg/day) or vehicle. Myocardial protein and mRNA levels of ACE-2, ANG 1-7 mas receptor were upregulated in the olmesartan-treated group compared with those of vehicle-treated DCM rats. In contrast, Olmesartan treatment effectively suppressed the myocardial protein and mRNA expressions of inflammatory markers in comparison to the vehicle-treated DCM rats. Olmesartan treatment significantly reduced fibrosis, hypertrophy and their marker molecules (OPN, CTGF, ANP and GATA-4, respectively), as well as matrix metalloproteinases compared with those of vehicle-treated DCM rats. Enhanced myocardial protein levels of phospho-p38 MAPK, phospho-JNK and phospho MAPKAPK-2 in the vehicle-treated DCM rats were prevented by olmesartan treatment. In addition, olmesartan treatment significantly lowered the protein expressions (Nitrotyrosine, p47phox and p67phox) and superoxide radical production compared with those of vehicle-treated DCM rats. Our present study might serve as a new therapeutic target of DCM in cardiovascular diseases and cardiac myosin-induced DCM via the modulation of ACE-2/ANG 1-7 mas receptor axis in rats with DCM after myosin-immunisation.
authors.affiliation: Department of Clinical Pharmacology, Faculty of Pharmaceutical Sciences, Niigata University of Pharmacy and Applied Life Sciences, Niigata, Japan.
authors.forename: Vijayakumar
authors.initials: V
authors.lastname: Sukumaran
authors.forename: Punniyakoti T
authors.initials: PT
authors.lastname: Veeraveedu
authors.forename: Arun Prasath
authors.initials: AP
authors.lastname: Lakshmanan
authors.forename: Narasimman
authors.initials: N
authors.lastname: Gurusamy
authors.forename: Ken'ichi
authors.initials: K
authors.lastname: Yamaguchi
authors.forename: Meilei
authors.initials: M
authors.lastname: Ma
authors.forename: Kenji
authors.initials: K
authors.lastname: Suzuki
authors.forename: Makoto
authors.initials: M
authors.lastname: Kodama
authors.forename: Kenichi
authors.initials: K
authors.lastname: Watanabe
mesh_terms: D000803:Angiotensin I / Q000378:metabolism; D047228:Angiotensin II Type 1 Receptor Blockers / Q000008:administration & dosage*; D000085962:Angiotensin-Converting Enzyme 2; D000818:Animals; D015415:Biomarkers / Q000378:metabolism; D024722:Cardiac Myosins / Q000008:administration & dosage / Q000276:immunology; D002311:Cardiomyopathy, Dilated / Q000139:chemically induced / Q000188:drug therapy* / Q000276:immunology; D010450:Endopeptidases / Q000378:metabolism; D005355:Fibrosis / Q000517:prevention & control; D005786:Gene Expression Regulation / Q000187:drug effects; D006321:Heart / Q000187:drug effects* / Q000503:physiopathology; D017379:Hypertrophy, Left Ventricular / Q000517:prevention & control; D007093:Imidazoles / Q000008:administration & dosage*; D020928:Mitogen-Activated Protein Kinases / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism; D000068557:Olmesartan Medoxomil; D010446:Peptide Fragments / Q000378:metabolism; D007703:Peptidyl-Dipeptidase A / Q000235:genetics / Q000378:metabolism*; D000090063:Proto-Oncogene Mas; D011518:Proto-Oncogene Proteins / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism*; D012333:RNA, Messenger / Q000096:biosynthesis; D051381:Rats; D043562:Receptors, G-Protein-Coupled / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism*; D013777:Tetrazoles / Q000008:administration & dosage*
chemical_list: D047228:Angiotensin II Type 1 Receptor Blockers; D015415:Biomarkers; D007093:Imidazoles; D010446:Peptide Fragments; D000090063:Proto-Oncogene Mas; D011518:Proto-Oncogene Proteins; D012333:RNA, Messenger; D043562:Receptors, G-Protein-Coupled; D013777:Tetrazoles; D000068557:Olmesartan Medoxomil; D000803:Angiotensin I; D020928:Mitogen-Activated Protein Kinases; D010450:Endopeptidases; D007703:Peptidyl-Dipeptidase A; C000705329:Ace2 protein, rat; D000085962:Angiotensin-Converting Enzyme 2; C047491:angiotensin-producing serum enzyme II; D024722:Cardiac Myosins; C118790:angiotensin I (1-7)