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• W2891149735 abstract "Background Single ventricle (SV) congenital heart disease is fatal without intervention, and eventual heart failure is a major cause of morbidity and mortality. Although there are no proven medical therapies for the treatment or prevention of heart failure in the SV heart disease population, phosphodiesterase-5 inhibitors (PDE5i), such as sildenafil, are increasingly used. Although the pulmonary vasculature is the primary target of PDE5i therapy in patients with SV heart disease, the effects of PDE5i on the SV heart disease myocardium remain largely unknown. We sought to determine PDE5 expression and activity in the single right ventricle of SV heart disease patients relative to nonfailing controls and to determine whether PDE5 impacts cardiomyocyte remodeling using a novel serum-based in vitro model. Methods and Results PDE5 expression (n=9 nonfailing; n=7 SV heart disease), activity (n=8 nonfailing; n=9 SV heart disease), and localization (n=3 SV heart disease) were determined in explanted human right ventricle myocardium. PDE5 is expressed in SV heart disease cardiomyocytes, and PDE5 protein expression and activity are increased in SV heart disease right ventricle compared with nonfailing right ventricle. Isolated neonatal rat ventricular myocytes were treated for 72 hours with nonfailing or SV heart disease patient serum±sildenafil. Reverse transcription quantitative polymerase chain reaction (n=5 nonfailing; n=12 SV heart disease) and RNA sequencing (n=3 nonfailing; n=3 SV heart disease) were performed on serum-treated neonatal rat ventricular myocytes and demonstrated that treatment with SV heart disease sera results in pathological gene expression changes that are attenuated with PDE5i. Conclusions PDE5 is increased in failing SV heart disease myocardium, and pathological gene expression changes in SV heart disease serum-treated neonatal rat ventricular myocytes are abrogated by PDE5i. These results suggest that PDE5 represents an intriguing myocardial therapeutic target in this population." @default.
• W2891149735 created "2018-09-27" @default.
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• W2891149735 date "2018-09-01" @default.
• W2891149735 modified "2023-10-01" @default.
• W2891149735 title "Phosphodiesterase-5 Is Elevated in Failing Single Ventricle Myocardium and Affects Cardiomyocyte Remodeling In Vitro" @default.
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• W2891149735 doi "https://doi.org/10.1161/circheartfailure.117.004571" @default.
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