Journal
CELL
Volume 161, Issue 7, Pages 1566-1575Publisher
CELL PRESS
DOI: 10.1016/j.cell.2015.05.026
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Funding
- Swedish Research Council
- Swedish Heart and Lung Foundation
- Swedish Cancer Society
- Karolinska Institute, Tobias Stiftelsen
- Strategic Research Programs in Stem Cells and Regenerative Medicine at Karolinska Institutet (StratRegen), Torsten Soderbergs Stiftelse, Knut och Alice Wallenbergs Stiftelse
- Richard and Helen DeVos Foundation
- Villum Foundation
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The contribution of cell generation to physiological heart growth and maintenance in humans has been difficult to establish and has remained controversial. We report that the full complement of cardiomyocytes is established perinataly and remains stable over the human lifespan, whereas the numbers of both endothelial and mesenchymal cells increase substantially from birth to early adulthood. Analysis of the integration of nuclear bomb test-derived C-14 revealed a high turnover rate of endothelial cells throughout life (>15% per year) and more limited renewal of mesenchymal cells (<4% per year in adulthood). Cardiomyocyte exchange is highest in early childhood and decreases gradually throughout life to <1% per year in adulthood, with similar turnover rates in the major subdivisions of the myocardium. We provide an integrated model of cell generation and turnover in the human heart.
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