Relaxin remodels fibrotic healing following myocardial infarction

In the setting of myocardial infarction (MI), implanted stem cell viability is low and scar formation limits stem cell homing, viability, and integration. Thus, interventions that favorably remodel fibrotic healing may benefit stem cell therapies. However, it remains unclear whether it is feasible a...

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Veröffentlicht in:Laboratory investigation 2011-05, Vol.91 (5), p.675-690
Hauptverfasser: Samuel, Chrishan S, Cendrawan, Sofia, Gao, Xiao-Ming, Ming, Ziqiu, Zhao, Chongxin, Kiriazis, Helen, Xu, Qi, Tregear, Geoffrey W, Bathgate, Ross A D, Du, Xiao-Jun
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container_end_page 690
container_issue 5
container_start_page 675
container_title Laboratory investigation
container_volume 91
creator Samuel, Chrishan S
Cendrawan, Sofia
Gao, Xiao-Ming
Ming, Ziqiu
Zhao, Chongxin
Kiriazis, Helen
Xu, Qi
Tregear, Geoffrey W
Bathgate, Ross A D
Du, Xiao-Jun
description In the setting of myocardial infarction (MI), implanted stem cell viability is low and scar formation limits stem cell homing, viability, and integration. Thus, interventions that favorably remodel fibrotic healing may benefit stem cell therapies. However, it remains unclear whether it is feasible and safe to remodel fibrotic healing post-MI without compromising ventricular remodeling and dysfunction. This study, therefore, determined the anti-fibrotic and other effects of the hormone, relaxin in a mouse model of MI. Adult male mice underwent left coronary artery ligation-induced MI and were immediately treated with recombinant human relaxin (MI+RLX) or vehicle (MI+VEH) over 7 or 30 days, representing time points of early and mature fibrotic healing. Cardiac function was assessed by echocardiography and catheterization, while comprehensive immunohistochemistry, morphometry, and western blotting were performed to explore the relaxin-induced mechanisms of action post-MI. RLX significantly inhibited the MI-induced progression of cardiac fibrosis over 7 and 30 days, which was associated with a reduction in TGF-β1 expression, myofibroblast differentiation, and cardiomyocyte apoptosis in addition to a promotion of matrix metalloproteinase-13 levels and de novo blood vessel growth (all P
doi_str_mv 10.1038/labinvest.2010.198
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Thus, interventions that favorably remodel fibrotic healing may benefit stem cell therapies. However, it remains unclear whether it is feasible and safe to remodel fibrotic healing post-MI without compromising ventricular remodeling and dysfunction. This study, therefore, determined the anti-fibrotic and other effects of the hormone, relaxin in a mouse model of MI. Adult male mice underwent left coronary artery ligation-induced MI and were immediately treated with recombinant human relaxin (MI+RLX) or vehicle (MI+VEH) over 7 or 30 days, representing time points of early and mature fibrotic healing. Cardiac function was assessed by echocardiography and catheterization, while comprehensive immunohistochemistry, morphometry, and western blotting were performed to explore the relaxin-induced mechanisms of action post-MI. RLX significantly inhibited the MI-induced progression of cardiac fibrosis over 7 and 30 days, which was associated with a reduction in TGF-β1 expression, myofibroblast differentiation, and cardiomyocyte apoptosis in addition to a promotion of matrix metalloproteinase-13 levels and de novo blood vessel growth (all P&lt;0.05 vs respective measurements from MI+VEH mice). Despite the evident fibrotic healing post-MI, relaxin did not adversely affect the incidence of ventricular free-wall rupture or the extent of LV remodeling and dysfunction. 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subjects 631/136/16
692/699/75/2/1674
692/700/565/1331/238
angiogenesis
Animals
apoptosis
Biological and medical sciences
Biotechnology
Blotting, Western
cardiac fibrosis
Cardiology. Vascular system
Coronary heart disease
Fibrosis
Fundamental and applied biological sciences. Psychology
Heart
Investigative techniques, diagnostic techniques (general aspects)
Laboratory Medicine
Male
Medical sciences
Medicine
Medicine & Public Health
Mice
Mice, Inbred C57BL
Myocardial Infarction - drug therapy
Myocardial Infarction - physiopathology
Organ Size
Pathology
relaxin
Relaxin - therapeutic use
remodeling
research-article
TGF-β1
Treatment Outcome
Ventricular Remodeling
title Relaxin remodels fibrotic healing following myocardial infarction
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