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Bone-Marrow-Derived Side Population Cells for Myocardial Regeneration

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Abstract

Bone-marrow-derived stem cells have displayed the potential for myocardial regeneration in animal models as well as in clinical trials. Unfractionated bone marrow mononuclear cell (MNC) population is a heterogeneous group of cells known to include a number of stem cell populations. Cells in the side population (SP) fraction have a high capacity for differentiation into multiple lineages. In the current study, we investigated the role of murine and human bone-marrow-derived side population cells in myocardial regeneration. In these studies, we show that mouse bone-marrow-derived SP cells expressed the contractile protein, alpha-actinin, following culture with neonatal cardiomyocytes and after delivery into the myocardium following injury. Moreover, the number of green-fluorescent-protein-positive cells, of bone marrow side population origin, increased progressively within the injured myocardium over 90 days. Transcriptome analysis of these bone marrow cells reveals a pattern of expression consistent with immature cardiomyocytes. Additionally, the differentiation capacity of human granulocyte colony-stimulating factor stimulated peripheral blood stem cells were assessed following injection into injured rat myocardium. Bone marrow mononuclear cell and side population cells were both readily identified within the rat myocardium 1 month following injection. These human cells expressed human-specific cardiac troponin I as determined by immunohistochemistry as well as numerous cardiac transcripts as determined by polymerase chain reaction. Both human bone marrow mononuclear cells and human side population cells augmented cardiac systolic function following a modest drop in function as a result of cryoinjury. The augmentation of cardiac function following injection of side population cells occurred earlier than with bone marrow mononuclear cells despite the fact that the number of side population cells used was one tenth that of bone marrow mononuclear cells (9 × 105 cells per heart in the MNC group compared to 9 × 104 per heart in the SP group). These results support the hypotheses that rodent and human-bone-marrow derived side population cells are capable of acquiring a cardiac fate and that human bone-marrow-derived side population cells are superior to unfractionated bone marrow mononuclear cells in augmenting left ventricular systolic function following cryoinjury.

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Acknowledgements

The authors acknowledge the technical assistance provided by Maggie Robeldo, Caroline Humphries, Sean Goetsch, and Nan Jiang.

Sources of Funding

Funding was provided by the GlaxoSmithKline (CMM), American Heart Association (DJG, HAS), and March of Dimes Associations (DJG).

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Authors and Affiliations

  1. Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, TX, 75390, USA

    Hesham A. Sadek, Cindy M. Martin, Shuaib S. Latif, Mary G. Garry & Daniel J. Garry

  2. Lillehei Heart Institute, University of Minnesota, 312 Church St. SE, Minneapolis, MN, 55455, USA

    Cindy M. Martin, Mary G. Garry & Daniel J. Garry

Authors
  1. Hesham A. Sadek
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  2. Cindy M. Martin
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  3. Shuaib S. Latif
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  4. Mary G. Garry
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  5. Daniel J. Garry
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Corresponding author

Correspondence to Daniel J. Garry.

Additional information

Sadek and Martin contributed equally to this manuscript.

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Sadek, H.A., Martin, C.M., Latif, S.S. et al. Bone-Marrow-Derived Side Population Cells for Myocardial Regeneration. J. of Cardiovasc. Trans. Res. 2, 173–181 (2009). https://doi.org/10.1007/s12265-009-9090-0

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  • DOI: https://doi.org/10.1007/s12265-009-9090-0

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