Existing cardiomyocytes generate cardiomyocytes at a low rate after birth in mice Journal Article

Author(s): Ali, Shah R; Hippenmeyer, Simon; Saadat, Lily V; Luo, Liqun; Weissman, Irving L; Ardehali, Reza
Article Title: Existing cardiomyocytes generate cardiomyocytes at a low rate after birth in mice
Affiliation IST Austria
Abstract: The mammalian heart has long been considered a postmitotic organ, implying that the total number of cardiomyocytes is set at birth. Analysis of cell division in the mammalian heart is complicated by cardiomyocyte binucleation shortly after birth, which makes it challenging to interpret traditional assays of cell turnover [Laflamme MA, Murray CE (2011) Nature 473(7347):326–335; Bergmann O, et al. (2009) Science 324(5923):98–102]. An elegant multi-isotope imaging-mass spectrometry technique recently calculated the low, discrete rate of cardiomyocyte generation in mice [Senyo SE, et al. (2013) Nature 493(7432):433–436], yet our cellular-level understanding of postnatal cardiomyogenesis remains limited. Herein, we provide a new line of evidence for the differentiated α-myosin heavy chain-expressing cardiomyocyte as the cell of origin of postnatal cardiomyogenesis using the “mosaic analysis with double markers” mouse model. We show limited, life-long, symmetric division of cardiomyocytes as a rare event that is evident in utero but significantly diminishes after the first month of life in mice; daughter cardiomyocytes divide very seldom, which this study is the first to demonstrate, to our knowledge. Furthermore, ligation of the left anterior descending coronary artery, which causes a myocardial infarction in the mosaic analysis with double-marker mice, did not increase the rate of cardiomyocyte division above the basal level for up to 4 wk after the injury. The clonal analysis described here provides direct evidence of postnatal mammalian cardiomyogenesis.
Keywords: aging; Regeneration; heart development; cardiovascular progenitors
Journal Title: PNAS
Volume: 111
Issue 24
ISSN: 1091-6490
Publisher: National Academy of Sciences  
Date Published: 2014-06-17
Start Page: 8850
End Page: 8855
DOI: 10.1073/pnas.1408233111
Open access: no