Circulation · 2003
Consequences of pressure overload on sarcomere protein mutation-induced hypertrophic cardiomyopathy.
СтатьяПоддержка исследования: вне правительства СШАНазвание и аннотация: Перевод в очереди
Обработка статьи · этапы, ошибки и управление
Загрузка состояния…
Ошибки и ограничения
История · было → стало
Состояние обновляется каждые 5 секунд, пока блок открыт. Процент показывается только там, где известен объём работы. Пауза останавливает продолжение этапа; текущий запрос к источнику может завершиться.
Schmitt Joachim P, Semsarian Christopher, Arad Michael, Gannon Joseph, Ahmad Ferhaan, Duffy Catherine, Lee Richard T, Seidman Christine E, Seidman J G
Аннотация
BACKGROUND: Whether ventricular remodeling from hypertrophic cardiomyopathy (HCM), systemic hypertension, or other pathologies arises through a common signaling pathway or through independent molecular mechanisms is unknown. To study this, we assessed cardiac hypertrophy in a mouse model of HCM subjected to increased left ventricular (LV) load.
METHODS AND RESULTS: Transverse aortic banding of mice with or without an Arg403Gln cardiac myosin heavy chain mutation (alphaMHC403/+) produced similarly elevated LV pressures (120+/-30 versus 112+/-14 mm Hg; P=NS). No mice developed heart failure, and mortality (26% alphaMHC403/+, 35% wild-type) was comparable. Load-induced hypertrophy was identical in banded 129SvEv alphaMHC403/+ mice (LV anterior wall [LVAW]=1.28+/-0.11) and 129SvEv wild-type mice (LVAW=1.29+/-0.11 mm; P=NS). Genetically outbred Black Swiss (BS) alphaMHC403/+ mice showed only mildly exaggerated hypertrophy in response to aortic banding (BS alphaMHC403/+ LVAW=1.30+/-0.13 mm; BS wild-type LVAW=1.17+/-0.15 mm; P=0.03), suggesting some effect from a BS genetic locus that modifies hypertrophy induced by the cardiac MHC Arg403Gln mutation. Histopathology and molecular markers of hypertrophy were comparable in all banded 129SvEv or BS mice. Banded alphaMHC403/+ mice had potential for greater hypertrophy, because cyclosporin A treatment markedly augmented hypertrophy.
CONCLUSIONS: The uniform hypertrophic response to increased ventricular load in wild-type and alphaMHC403/+ mice indicates independent cardiac remodeling pathways and predicts that coexistent hypertension and HCM should not profoundly exacerbate cardiac hypertrophy. In contrast, sarcomere mutation and cyclosporin A-mediated calcineurin inhibition stimulate a shared hypertrophic signaling pathway. Defining distinct signaling pathways that trigger myocyte growth should help to tailor therapies for cardiac hypertrophy.
METHODS AND RESULTS: Transverse aortic banding of mice with or without an Arg403Gln cardiac myosin heavy chain mutation (alphaMHC403/+) produced similarly elevated LV pressures (120+/-30 versus 112+/-14 mm Hg; P=NS). No mice developed heart failure, and mortality (26% alphaMHC403/+, 35% wild-type) was comparable. Load-induced hypertrophy was identical in banded 129SvEv alphaMHC403/+ mice (LV anterior wall [LVAW]=1.28+/-0.11) and 129SvEv wild-type mice (LVAW=1.29+/-0.11 mm; P=NS). Genetically outbred Black Swiss (BS) alphaMHC403/+ mice showed only mildly exaggerated hypertrophy in response to aortic banding (BS alphaMHC403/+ LVAW=1.30+/-0.13 mm; BS wild-type LVAW=1.17+/-0.15 mm; P=0.03), suggesting some effect from a BS genetic locus that modifies hypertrophy induced by the cardiac MHC Arg403Gln mutation. Histopathology and molecular markers of hypertrophy were comparable in all banded 129SvEv or BS mice. Banded alphaMHC403/+ mice had potential for greater hypertrophy, because cyclosporin A treatment markedly augmented hypertrophy.
CONCLUSIONS: The uniform hypertrophic response to increased ventricular load in wild-type and alphaMHC403/+ mice indicates independent cardiac remodeling pathways and predicts that coexistent hypertension and HCM should not profoundly exacerbate cardiac hypertrophy. In contrast, sarcomere mutation and cyclosporin A-mediated calcineurin inhibition stimulate a shared hypertrophic signaling pathway. Defining distinct signaling pathways that trigger myocyte growth should help to tailor therapies for cardiac hypertrophy.