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Updated: May 3, 2026
Assessing Cardiomyocyte Subtypes Following Transcription Factor-mediated Reprogramming of Mouse Embryonic Fibroblasts
Published on: March 22, 2017
[From precursor to reprogrammed cells: evolution of cardiomyoplasty]
Stanisław Szala1, Sybilla Matuszczak1, Justyna Czapla1
1Centrum Badań Translacyjnych i Biologii Molekularnej Nowotworów, Centrum Onkologii-Instytut im. Marii Skłodowskiej-Curie, Oddział w Gliwicach.
Insights
Heart regeneration after myocardial infarction (MI) is limited. Promising strategies include in situ fibroblast reprogramming and cardiomyocyte proliferation, potentially combined with paracrine effects for improved cardiac function.
Area of Science:
- Cardiovascular Biology
- Regenerative Medicine
- Cardiac Pathophysiology
Background:
- Myocardial infarction (MI) causes significant loss of cardiomyocytes (CM), leading to impaired heart function due to limited endogenous regeneration.
- Current therapeutic strategies aim to restore CM numbers through cell transplantation or stimulating endogenous repair mechanisms.
Purpose of the Study:
- To evaluate various strategies for increasing cardiomyocyte numbers post-MI.
- To identify the most promising approaches for cardiac repair and functional recovery.
Main Methods:
- Review and analysis of preclinical and clinical data on cell transplantation (progenitor/stem cells, pluripotent cells), in situ reprogramming of fibroblasts, and pharmacological stimulation of cardiomyocyte proliferation.
- Assessment of therapeutic efficacy based on cardiomyocyte regeneration, cardiac function improvement (e.g., left ventricular ejection fraction), and scar reduction.
Main Results:
- Cell transplantation shows limited differentiation capacity but offers therapeutic benefits via paracrine effects.
- In situ reprogramming of fibroblasts into cardiomyocyte-like cells and stimulation of endogenous cardiomyocyte proliferation are identified as key strategies.
- Combined approaches involving paracrine-stimulating agents and fibroblast reprogramming show potential for optimal therapeutic outcomes.
Conclusions:
- Strategies focusing on in situ cardiac regeneration, specifically fibroblast reprogramming and cardiomyocyte proliferation, hold significant promise for treating myocardial infarction.
- Optimized therapeutic solutions may involve a combination of approaches to enhance cardiac repair, improve ejection fraction, and reduce infarct scar size.
Abstract:
Myocardial infarction is underoxygenation-driven limited necrosis of heart tissues which results in elimination of ca. 0.5 to 1 billion spontaneously contracting cardiomyocytes (CM). Since the ability of human heart to regenerate is limited, efforts have been undertaken to increase the number of cardiomyocytes in post-infarction myocardium. Theoretically, such proposals might involve transplantation of 1) skeletal myoblasts and cardiomyocytes, or 2) progenitor/stem cells, theoretically capable of differentiating into cardiomyocytes, or 3) pluripotent cells such as embryonal stem cells (ESC) and induced pluripotent stem cells (iPSC) differentiating into cardiomyocytes. The efforts to increase CM could also involve 4) in situ reprogramming of fibroblasts into active cardiomyocyte-like cells, or 5) stimulating in situ proliferation of cardiomyocytes using pharmacological agents. Only three proposals merit closer scrutiny (2, 4 and 5). However, preclinical and clinical data have demonstrated weak ability of progenitor cells to differentiate (proposal 2). Nevertheless, transplanted cell-induced paracrine effects accompanying such therapy do improve functioning of the damaged heart muscle. The proposals that would permit the number of CM to be increased include in situ reprogramming of fibroblasts into active cardiomyocytes (proposal 4), as well as in situ stimulation of quiescent cardiomyocytes' proliferation (proposal 5). It appears that an optimized therapeutic solution (increasing left ventricular ejection fraction and decreasing the post-infarct scar) might combine agents stimulating paracrine effects and reprogramming of fibroblasts.
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