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Induction of Endothelial Differentiation in Cardiac Progenitor Cells Under Low Serum Conditions
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c-Kit+ bone marrow stem cells differentiate into functional cardiac myocytes.

Hajime Kubo1, Remus M Berretta, Naser Jaleel

  • 1Department of Physiology, Cardiovascular Research Center, Temple University School of Medicine, Philadelphia, PA, USA.

Clinical and Translational Science
|May 7, 2010
PubMed
Summary

This study shows that c-kit(+) bone marrow stem cells (BMSCs) can transform into functional cardiac myocytes. These cells require co-culture with neonatal rat ventricular myocytes (NRVMs) to mature and form functional gap junctions.

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Area of Science:

  • Regenerative Medicine
  • Cardiovascular Biology
  • Stem Cell Biology

Background:

  • The potential of bone marrow cells (BMCs) to regenerate cardiac myocytes remains debated.
  • Understanding the specific BMC populations capable of cardiac myocyte differentiation is crucial for therapeutic applications.

Purpose of the Study:

  • To investigate the capacity of different types of BMCs to differentiate into functional cardiac myocytes.
  • To compare the myogenic potential of c-kit(+) bone marrow stem cells (BMSCs), c-kit(+) BMCs, and crude BMCs.

Main Methods:

  • Isolated BMCs (BMSCs, c-kit(+), crude) were labeled and co-cultured with neonatal rat ventricular myocytes (NRVMs).
  • Cells were analyzed using immunofluorescence staining (c-kit, alpha-tropomyosin, alpha-actinin, Cx43, Ki67) and confocal microscopy.

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  • Electrophysiology and gap junction function (FRAP) were assessed in differentiated cells.

    • Main Results:

    • BMCs proliferated and differentiated into cardiac myocytes within 48 hours of co-culture.
    • c-kit(+) BMSCs demonstrated a significantly higher myogenic rate (41.2%) compared to other BMC types.
    • Newly formed myocytes required electrical coupling with NRVMs via functional gap junctions to achieve mature electrophysiological properties.

    Conclusions:

    • c-kit(+) BMSCs possess the ability to transdifferentiate into functional cardiac myocytes.
    • The differentiation and maturation of BMC-derived myocytes are dependent on the presence of NRVMs and the formation of functional gap junctions.