Identification of myocardial and vascular precursor cells in human and mouse epicardium

Federica Limana, Antonella Zacheo, David Mocini, Antonella Mangoni, Giovanna Borsellino, Adamo Diamantini, Roberta De Mori, Luca Battistini, Elisa Vigna, Massimo Santini, Vincenzo Loiaconi, Giulio Pompilio, Antonia Germani, Maurizio C. Capogrossi

Research output: Contribution to journalArticlepeer-review

Abstract

During cardiac development, the epicardium is the source of multipotent mesenchymal cells, which give rise to endothelial and smooth muscle cells in coronary vessels and also, possibly, to cardiomyocytes. The aim of the present study was to determine whether stem cells are retained in the adult human and murine epicardium and to investigate the regenerative potential of these cells following acute myocardial infarction. We show that c-kit and CD34 cells can indeed be detected in human fetal and adult epicardium and that they represent 2 distinct populations. Both subsets of cells were negative for CD45, a cell surface marker that identifies the hematopoietic cell lineage. Immunofluorescence revealed that freshly isolated c-kit and CD34 cells expressed early and late cardiac transcription factors and could acquire an endothelial phenotype in vitro. In the murine model of myocardial infarction, there was an increase in the absolute number and proliferation of epicardial c-kit cells 3 days after coronary ligation; at this time point, epicardial c-kit cells were identified in the subepicardial space and expressed GATA4. Furthermore, 1 week after myocardial infarction, cells coexpressing c-kit, together with endothelial or smooth muscle cell markers, were identified in the wall of subepicardial blood vessels. In summary, the postnatal epicardium contains a cell population with stem cell characteristics that retains the ability to give rise to myocardial precursors and vascular cells. These cells may play a role in the regenerative response to cardiac damage.

Original languageEnglish
Pages (from-to)1255-1265
Number of pages11
JournalCirculation Research
Volume101
Issue number12
DOIs
Publication statusPublished - Dec 2007

Keywords

  • Cardiovascular differentiation
  • Epicardium
  • Infarction
  • Stem cells

ASJC Scopus subject areas

  • Physiology
  • Cardiology and Cardiovascular Medicine

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