C-kit+ cardiac progenitors exhibit mesenchymal markers and preferential cardiovascular commitment

Area of Science:

• Cardiovascular Biology
• Stem Cell Research
• Regenerative Medicine

Background:

• The heart harbors c-kit(+) progenitor cells crucial for maintaining cardiac homeostasis.
• Cardiac c-kit(+) cells are multipotent, generating myocardial, endothelial, and smooth muscle cells.
• Recent studies suggest cardiac progenitor cells express mesenchymal stem cell (MSC) markers and possess MSC differentiation potential.

Purpose of the Study:

• To investigate if c-kit(+) cardiac progenitor cells share phenotypic and functional characteristics with cardiac MSCs.
• To explore the differentiation capacity of c-kit(+) cells in vitro and in vivo.

Main Methods:

• Enzymatic dissociation of heart auricle fragments to culture cells.
• Identification and sorting of c-kit(+) cells co-expressing MSC markers using flow cytometry.
• Immunofluorescence analysis of auricle tissue to detect c-kit(+) and MSC markers in vivo.
• Ex vivo expansion and differentiation induction of sorted c-kit(+) cells.

Main Results:

• A fibroblast-like cell population expressing mesenchymal markers was generated from heart auricles.
• C-kit(+) cells co-expressing MSC markers were identified both in vitro and in vivo.
• Ex vivo expanded c-kit(+) cells differentiated into osteoblasts, adipocytes, vascular smooth muscle cells, endothelium-like cells, and cardiac-like cells.

Conclusions:

• Cardiac c-kit(+) progenitors are primitive stem cells with multilineage differentiation capabilities.
• These findings support a potential relationship between cardiac c-kit(+) progenitors and a heart-specific MSC population.
• Cardiac c-kit(+) cells may possess cardiovascular commitment potential.