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Cardiospheres reverse adverse remodeling in chronic rat myocardial infarction: roles of soluble endoglin and Tgf-β signaling

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Abstract

Self-assembling heart-derived stem cell clusters named cardiospheres (CSps) improve function and attenuate remodeling in rodent models of acute myocardial infarction. The effects of CSps in chronically remodeled myocardium post-MI, and the underlying mechanisms, remain unknown. One month after permanent coronary ligation, rats were randomly assigned to injection of vehicle (controls) or CSps in the peri-infarct area. One month post-injection, CSps increased left ventricular function, reduced scar mass and collagen density, and enhanced vascularity within the infarct zone compared to controls. Immunoblots revealed Tgfβ-1/smad cascade downregulation and an increase in soluble endoglin post-CSp injection. Six months post-transplantation, left ventricular function further improved and cardiomyocyte hypertrophy was attenuated in the CSp-treated group. In vitro, co-culture of CSps with fibroblasts recapitulated the suppression of the Tgf-β1/smad pathway changes, responses which were blunted by neutralizing antibody against endoglin. Thus, cardiosphere transplantation enhances angiogenesis and reduces fibrosis in chronically infarcted myocardium, leading to partial reversal of cardiac dysfunction. The underlying mechanism involves inhibition of Tgf-β1/smad signaling by CSp-secreted soluble endoglin.

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Acknowledgments

This work was supported by the California Institute for Regenerative Medicine (CIRM; RB4-06215) and the Cedars-Sinai Board of Governors Heart Stem Cell Center.

Conflict of interest

Eduardo Marbán is founder of, unpaid advisor to, and owns equity in Capricor. The other authors report no conflicts. Capricor provided no support for the present study.

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Authors and Affiliations

  1. Cedars-Sinai Heart Institute, 8700 Beverly Blvd, Los Angeles, CA, 90048, USA

    Eleni Tseliou, Heidi Reich, Geoffrey de Couto, Baiming Sun, Weixin Liu & Eduardo Marbán

  2. Third Department of Cardiology, University of Athens, Athens, Greece

    John Terrovitis

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  1. Eleni Tseliou
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  2. Heidi Reich
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  7. Eduardo Marbán
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Correspondence to Eduardo Marbán.

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Tseliou, E., Reich, H., de Couto, G. et al. Cardiospheres reverse adverse remodeling in chronic rat myocardial infarction: roles of soluble endoglin and Tgf-β signaling. Basic Res Cardiol 109, 443 (2014). https://doi.org/10.1007/s00395-014-0443-8

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  • DOI: https://doi.org/10.1007/s00395-014-0443-8

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