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Myocyte death, growth, and regeneration in cardiac hypertrophy and failure
Bernardo Nadal-Ginard1, Jan Kajstura, Annarosa Leri
1Cardiovascular Research Institute, Department of Medicine, New York Medical College, Valhalla, NY 10595, USA. b_nadal-ginard@nymc.edu
Insights
The adult mammalian heart, once thought to be postmitotic, contains a small population of regenerating heart muscle cells (myocytes). This discovery opens new avenues for understanding heart repair and cardiac stem cell therapies.
Area of Science:
- Cardiovascular Biology
- Regenerative Medicine
- Cardiac Physiology
Background:
- The traditional view holds the adult mammalian heart as a postmitotic organ with a stable myocyte count.
- This concept is challenged by evidence of ongoing myocyte renewal.
Purpose of the Study:
- To investigate the presence and role of cycling myocytes in the adult heart.
- To explore the potential of cardiac stem-like cells in myocyte regeneration and myocardial repair.
Main Methods:
- Analysis of myocyte populations in adult mammalian hearts.
- Investigation of cardiac stem-like cell differentiation pathways.
Main Results:
- A small subpopulation of cycling myocytes is continuously renewed.
- These cycling myocytes originate from the differentiation of cardiac stem-like cells.
- Myocyte death and regeneration are key factors in cardiac homeostasis and disease.
Conclusions:
- The adult heart exhibits a degree of regenerative capacity through myocyte turnover.
- Cardiac stem-like cells are a promising source for future myocardial regeneration strategies.
- Understanding these mechanisms is crucial for treating cardiac conditions.
Abstract:
The accepted paradigm considers the adult mammalian heart as a postmitotic organ, which possesses a relatively constant number of myocytes from shortly after birth to adulthood and senescence. This notion is questioned by the demonstration that although most adult myocytes are terminally differentiated, there is a small and continuously renewed subpopulation of cycling myocytes produced by the differentiation of cardiac stem-like cells. Myocyte death and myocyte regeneration are introduced as major determinants of cardiac homeostasis and alterations of ventricular anatomy and function in physiological and pathological states. The possibility of reconstituting dead myocardium by stem-like cells is advanced and proposed as a major area of future research.