Abstract |
Regardless of the origin, injury to the heart can result in cardiomyocyte hypertrophy, fibrosis, and cell death. Myocarditis often progresses to dilated cardiomyopathy (DCM), a major cause of heart failure. In our study, we used a rat model of myosin-induced experimental autoimmune myocarditis (EAM), in which the heart transits from an acute phase (inflammatory myocarditis) to a chronic phase (remodeling and DCM). Our objective was to investigate whether T-3999, a novel phenylpyridazinone, can reduce this progression. Four weeks after myosin injection, T-3999 was administered daily to male Lewis rats in two doses (3 and 10 mg/kg, orally). Four weeks later, treatment was terminated; hemodynamic and echocardiographic measurements were performed; hearts were excised for histopathology and estimation of histamine, mRNA, and protein levels. Mortality rate was reduced by drug treatment. T-3999 reduced % fibrosis and tissue collagen III. Profibrotic markers-transforming growth factor-β(1), tumor necrosis factor-α, and galectin-3--were attenuated by treatment. Mast cell density and degranulation, and tissue histamine concentration were also reduced. This indicates an anti-inflammatory effect of the drug in reducing fibrosis. Hypertrophy was reduced as reflected by reduced myocyte diameter and natriuretic peptide expression. T-3999 treatment increased the sarcoendoplasmic reticulum Ca(2+) ATPase 2 protein level and improved several cardiac function parameters. The reduction of the remodeling process and improvement in myocardial function suggest an effect of T-3999 in attenuating ventricular remodeling in post- myocarditis DCM.
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Authors | Fadia Ali Kamal, Kenichi Watanabe, Meilei Ma, Yuichi Abe, Reyad Elbarbary, Makoto Kodama, Yoshifusa Aizawa |
Journal | Heart and vessels
(Heart Vessels)
Vol. 26
Issue 1
Pg. 81-90
(Jan 2011)
ISSN: 1615-2573 [Electronic] Japan |
PMID | 20922534
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
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Chemical References |
- Cardiovascular Agents
- Cytokines
- Pyridazines
- Myosins
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Topics |
- Animals
- Autoimmune Diseases
(chemically induced, diagnostic imaging, drug therapy, metabolism, physiopathology)
- Cardiomyopathy, Dilated
(diagnostic imaging, etiology, metabolism, physiopathology, prevention & control)
- Cardiovascular Agents
(pharmacology)
- Cell Degranulation
(drug effects)
- Cytokines
(metabolism)
- Disease Models, Animal
- Disease Progression
- Fibrosis
- Hemodynamics
(drug effects)
- Histamine Release
(drug effects)
- Male
- Mast Cells
(drug effects)
- Myocarditis
(chemically induced, diagnostic imaging, drug therapy, metabolism, physiopathology)
- Myosins
- Pyridazines
(pharmacology)
- Rats
- Rats, Inbred Lew
- Time Factors
- Ultrasonography
- Ventricular Remodeling
(drug effects)
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