OBJECTIVES: The purpose of this study is to investigate the role of endogenous endothelin-1 (ET-1) in myocardial growth in Bio 14.6 Syrian cardiomyopathic hamsters (Bio). BACKGROUND: While ET-1, as a growth-promoting peptide, has been implicated in the development of secondary cardiac hypertrophy, the role of endogenous ET-1 in cardiac growth in primary myocardial disease is unknown. METHODS: We measured left ventricular ET-1 levels by a specific sandwich enzyme-linked immunosorbent assay. Furthermore, we examined the chronic effect of T0201, an ET type A receptor-specific antagonist. RESULTS: The ET-1 levels in the left ventricles were 1.8-fold higher (p < 0.0005) at 20 weeks and 6.4-fold higher (p < 0.0001) at 35 weeks in the Bio compared to age-matched control F1B hamsters (F1B). The Bio ET-1 levels in the lungs exhibited an only 1.3-fold elevation at 35 weeks. Immunohistochemistry demonstrated the localization of ET-1 mainly in the cardiac myocytes. The treatment with T0201 significantly reduced the heart weight/body weight ratio in the Bio, but did not affect the heart weight/body weight ratio in the F1B. Histologically, T0201 reduced the myocyte diameter of Bio to a level similar with that of F1B. However, T0201 did not affect the extent of fibrosis in Bio or F1B. CONCLUSIONS: The ET-1 level in the heart of cardiomyopathic hamsters increases in stage-dependent and organ-specific manners. Though myocyte degeneration and subsequent replacement fibrosis do not require an ET-1 pathway, the accelerated synthesis of ET-1 in the heart may contribute to the pathological growth of remaining myocytes in this animal model.
OBJECTIVES: The purpose of this study is to investigate the role of endogenous endothelin-1 (ET-1) in myocardial growth in Bio 14.6 Syrian cardiomyopathic hamsters (Bio). BACKGROUND: While ET-1, as a growth-promoting peptide, has been implicated in the development of secondary cardiac hypertrophy, the role of endogenous ET-1 in cardiac growth in primary myocardial disease is unknown. METHODS: We measured left ventricular ET-1 levels by a specific sandwich enzyme-linked immunosorbent assay. Furthermore, we examined the chronic effect of T0201, an ET type A receptor-specific antagonist. RESULTS: The ET-1 levels in the left ventricles were 1.8-fold higher (p < 0.0005) at 20 weeks and 6.4-fold higher (p < 0.0001) at 35 weeks in the Bio compared to age-matched control F1B hamsters (F1B). The Bio ET-1 levels in the lungs exhibited an only 1.3-fold elevation at 35 weeks. Immunohistochemistry demonstrated the localization of ET-1 mainly in the cardiac myocytes. The treatment with T0201 significantly reduced the heart weight/body weight ratio in the Bio, but did not affect the heart weight/body weight ratio in the F1B. Histologically, T0201 reduced the myocyte diameter of Bio to a level similar with that of F1B. However, T0201 did not affect the extent of fibrosis in Bio or F1B. CONCLUSIONS: The ET-1 level in the heart of cardiomyopathic hamsters increases in stage-dependent and organ-specific manners. Though myocyte degeneration and subsequent replacement fibrosis do not require an ET-1 pathway, the accelerated synthesis of ET-1 in the heart may contribute to the pathological growth of remaining myocytes in this animal model.
Authors: Myung-A Kim; Dongheon Yang; Keisuke Kida; Natalia Molotkova; Seon Ju Yeo; Nissi Varki; Michikado Iwata; Nancy D Dalton; Kirk L Peterson; Wolf-Eberhard Siems; Thomas Walther; Randy T Cowling; John Kjekshus; Barry Greenberg Journal: J Card Fail Date: 2010-05-23 Impact factor: 5.712
Authors: Randy T Cowling; Seon Ju Yeo; In Jai Kim; Joong Il Park; Yusu Gu; Nancy D Dalton; Kirk L Peterson; Barry H Greenberg Journal: Am J Physiol Heart Circ Physiol Date: 2014-07-03 Impact factor: 4.733
Authors: Marilena Minieri; Mara Zingarelli; Huda Shubeita; Alba Vecchini; Luciano Binaglia; Felicia Carotenuto; Cristina Fantini; Roberta Fiaccavento; Laura Masuelli; Anna Coletti; Lucilla Simonelli; Andrea Modesti; Paolo Di Nardo Journal: Mol Cell Biochem Date: 2003-10 Impact factor: 3.396