Abstract
The most efficient cells for cardiac regeneration are myocardium-resident cardiac stem cells. However, the limited availability of these cells restricts their utility for cardiac cellular therapy. Mesenchymal stem cells can differentiate into a wide variety of tissues, but it is not simple to accurately direct cell differentiation into a specific lineage, such as cardiac tissue; this renders a low efficiency for cardiac regeneration therapy. Given the heterogeneity of mesenchymal stem cells, it may be possible to find specific stem cell subpopulations with a definite differentiation capacity toward cardiac lineage. A parameter to assess cardiac differentiation specificity could be surface marker expression; a population with an immunophenotype similar to cardiac stem cells may have a superior therapeutic value than unsorted mesenchymal stem cells. We hypothesize the existence of a cell line that combines the expression of cardiac stem cell surface markers with those of mesenchymal stem cells, a suitable name for this population is cardiomesenchymal stem cells (CMSC); such cells would be ideal for cardiac regeneration.
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