Fibroblast cardiomyocyte interactions in the pressure overloaded myocardium
Technical Report,15 Sep 2017,14 Sep 2018
Albert Einstein College of Medicine Bronx United States
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Prevailing dogma suggests that fibroblasts exert detrimental actions on the pressure-overloaded heart, by secreting large amounts of extracellular matrix proteins that reduce myocardial compliance and promote diastolic dysfunction. Our exciting preliminary data challenge this concept, demonstrating that activated fibroblasts may protect cardiomyocytes in the pressure-overloaded heart. Fibroblast-specific loss of Smad3 accelerates systolic dysfunction following pressure overload, increasing cardiomyocyte apoptosis and leading to replacement fibrosis. We hypothesize that in the hostile environment of the pressure-overloaded heart, TGF--activated fibroblasts serve a protective role, by directly inducing a pro-survival program in cardiomyocytes exposed to mechanical stress, by secreting cardioprotective mediators, or by depositing specialized extracellular matrix proteins that prevent cardiomyocyte anoikis. This novel hypothesis will be tested using in vivo approaches and in vitro co-culture experiments.
- Medicine and Medical Research