1. Treatment with hESC-Derived Myocardial Precursors Improves Cardiac Function after a Myocardial Infarction.
- Author
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Ye, Jianqin, Gaur, Meenakshi, Zhang, Yan, Sievers, Richard E., Woods, Brandon J., Aurigui, Julian, Bernstein, Harold S., and Yeghiazarians, Yerem
- Subjects
MYOCARDIAL infarction treatment ,HEART function tests ,EMBRYONIC stem cells ,MEDICAL records ,GREEN fluorescent protein ,PROTEIN expression - Abstract
Background: We previously reported the generation of a reporter line of human embryonic stem cells (hESCs) with enhanced green fluorescent protein (eGFP) expression driven by the α-myosin heavy chain (αMHC) promoter. The GFP
+ /αMHC+ cells derived from this cell line behave as multipotent, human myocardial precursors (hMPs) in vitro. In this study, we evaluated the therapeutic effects of GFP+ /αMHC+ cells isolated from the reporter line in a mouse model of myocardial infarction (MI). Methods: MI was generated in immunodeficient mice. hMPs were injected into murine infarcted hearts under ultrasound guidance at 3 days post-MI. Human fetal skin fibroblasts (hFFs) were injected as control. Cardiac function was evaluated by echocardiography. Infarct size, angiogenesis, apoptosis, cell fate, and teratoma formation were analyzed by immunohistochemical staining. Results: Compared with control, hMPs resulted in improvement of cardiac function post-MI with smaller infarct size, induced endogenous angiogenesis, and reduced apoptosis of host cardiomyocytes at the peri-infarct zone at 28 days post-MI. Conclusion: Intramyocardial injection of hMPs improved cardiac function post-MI. The engraftment rate of these cells in the myocardium post-MI was low, suggesting that the majority of effect occurs via paracrine mechanisms. [ABSTRACT FROM AUTHOR]- Published
- 2015
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