A tissue engineered approach to progenitor cell delivery and myocardial repair

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Please use this identifier to cite or link to this item: http://hdl.handle.net/1853/37187

Title: A tissue engineered approach to progenitor cell delivery and myocardial repair
Author: Simpson, David Lemar
Abstract: Heart failure accounts for more deaths in the United States than any other pathology. Unfortunately, repairing the heart after pathological injury has become an overwhelming task for physicians and researchers to overcome. Fortunately, cellular cardiomyoplasty has emerged as a promising solution for sufferers of heart failure. Such a therapy is limited in efficacy due to poor engraftment efficiencies, however. To address this issue, we have developed a tissue engineered vehicle for cell delivery. Use of a "cardiac patch" resulted in localized and efficient delivery of human mesenchymal stem cells (hMSC) to infarcted myocardium. Application of a cardiac patch also attenuated adverse remodeling. Additionally, the culture of stem/progenitor cells within three dimensional collagen constructs led to modulations in cell function, which did not promote enhanced angiogenesis in vitro or in vivo. Despite enhanced neovessel formation, hMSC patches were more beneficial at augmenting myocardial repair compared to directly injected hMSC. Lastly, although hMSC represent an effective cell source option for enhancing cardiac repair they require additional purification and expansion steps which inherently delay the turnover before treatment. Therefore, suitable cell alternative are being sought. Human embryonic stem cell derived mesenchymal (B4) cells display several phenotypic similarities to hMSC. B4 progenitor cells responded similarly to hMSC in 3D culture. In addition B4 progenitor cell patch application to infarcted myocardium resulted in similar indices of repair compared to hMSC. Thus, a tissue engineering approach represents an effective cell delivery strategy and induces modulations in cell function which may demonstrate pathological significance.
Type: Dissertation
URI: http://hdl.handle.net/1853/37187
Date: 2009-08-21
Publisher: Georgia Institute of Technology
Subject: Stem cell
Tissue engineering
Myocardial infarction
Cell delivery
Paracrine
Progenitor cells
Coronary heart disease
Department: Biomedical Engineering
Advisor: Committee Chair: Dr. Samuel C. Dudley, Jr.; Committee Member: Dr. Marie Csete; Committee Member: Dr. Robert Nerem; Committee Member: Dr. Steven Stice; Committee Member: Dr. Todd McDevitt
Degree: Ph.D.

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