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A comparison of the efficacy of transplantation of bone marrow-derived mesenchymal stem cells and unrestricted somatic stem cells on outcome after acute myocardial infarction

INTRODUCTION: A number of questions remain unanswered in the field of cell therapy for acute myocardial infarction, including what is the optimal cell type, and can therapeutic efficacy be enhanced by conditioning regimens. In this study, we sought to address these questions by directly comparing th...

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Autores principales: Flynn, Aidan, Chen, Xizhe, O'Connell, Enda, O'Brien, Timothy
Formato: Online Artículo Texto
Lenguaje:English
Publicado: BioMed Central 2012
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3580427/
https://www.ncbi.nlm.nih.gov/pubmed/22974654
http://dx.doi.org/10.1186/scrt127
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author Flynn, Aidan
Chen, Xizhe
O'Connell, Enda
O'Brien, Timothy
author_facet Flynn, Aidan
Chen, Xizhe
O'Connell, Enda
O'Brien, Timothy
author_sort Flynn, Aidan
collection PubMed
description INTRODUCTION: A number of questions remain unanswered in the field of cell therapy for acute myocardial infarction, including what is the optimal cell type, and can therapeutic efficacy be enhanced by conditioning regimens. In this study, we sought to address these questions by directly comparing the effect of bone marrow-derived mesenchymal stem cells and unrestricted somatic stem cells delivered 24 hours post-myocardial infarction and by determining if the therapeutic efficacy of unrestricted somatic stem cells could be enhanced by exposing the cells to guiding factors before cell transplantation. METHODS: Unrestricted somatic stem cells were guided by exposure to 50 ng/mL basic fibroblast growth factor, 20 ng/mL hepatocyte growth factor and 20 ng/mL bone morphogenetic protein-2 for 24 hours. Using a Sprague-Dawley rat model of acute myocardial infarction, we transplanted cells by intramyocardial injection 24 hours post-myocardial infarction. Cardiac function was serially measured using echocardiography, and histological analyses of infarct morphology, angiogenesis and apoptosis were obtained. Transcriptomic and proteomic changes were assessed using microarray and real-time quantitative PCR. RESULTS: When assessed 28 days after the myocardial infarction, the delivery of mesenchymal stem cells 24 hours post-myocardial infarction did not improve ejection fraction (P = 0.19), and did not prevent the decline in ejection fraction observed in the absence of cell therapy (P = 0.17). The administration of unrestricted somatic stem cells also did not improve ejection fraction (P = 0.11), but did prevent a further decline in ejection fraction (P = 0.001). Delivery of guided unrestricted somatic stem cells significantly improved ejection fraction (P = 0.03). Guided unrestricted somatic stem cells restored function to a greater extent than mesenchymal stem cells (P = 0.03). The infarct area (P = 0.2), apoptosis (P = 0.07) and angiogenesis (P = 0.09) did not differ between groups. Microarray analysis revealed that, following pre-implantation guiding, the gene groupings of mitosis, signalling and angiogenesis were highly overrepresented, mediators of apoptosis were overrepresented, and cardiomyocyte-associated genes were not differentially expressed. CONCLUSIONS: These results suggest that guided unrestricted somatic stem cells have a moderate capacity to repair cardiac damage and that they are more effective than mesenchymal stem cells in restoring cardiac function after a myocardial infarction. The mechanism of the benefit was not fully elucidated in this study, but these observations may be mediated by favorable dysregulation of angiogenic and apoptotic gene groupings.
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spelling pubmed-35804272013-02-26 A comparison of the efficacy of transplantation of bone marrow-derived mesenchymal stem cells and unrestricted somatic stem cells on outcome after acute myocardial infarction Flynn, Aidan Chen, Xizhe O'Connell, Enda O'Brien, Timothy Stem Cell Res Ther Research INTRODUCTION: A number of questions remain unanswered in the field of cell therapy for acute myocardial infarction, including what is the optimal cell type, and can therapeutic efficacy be enhanced by conditioning regimens. In this study, we sought to address these questions by directly comparing the effect of bone marrow-derived mesenchymal stem cells and unrestricted somatic stem cells delivered 24 hours post-myocardial infarction and by determining if the therapeutic efficacy of unrestricted somatic stem cells could be enhanced by exposing the cells to guiding factors before cell transplantation. METHODS: Unrestricted somatic stem cells were guided by exposure to 50 ng/mL basic fibroblast growth factor, 20 ng/mL hepatocyte growth factor and 20 ng/mL bone morphogenetic protein-2 for 24 hours. Using a Sprague-Dawley rat model of acute myocardial infarction, we transplanted cells by intramyocardial injection 24 hours post-myocardial infarction. Cardiac function was serially measured using echocardiography, and histological analyses of infarct morphology, angiogenesis and apoptosis were obtained. Transcriptomic and proteomic changes were assessed using microarray and real-time quantitative PCR. RESULTS: When assessed 28 days after the myocardial infarction, the delivery of mesenchymal stem cells 24 hours post-myocardial infarction did not improve ejection fraction (P = 0.19), and did not prevent the decline in ejection fraction observed in the absence of cell therapy (P = 0.17). The administration of unrestricted somatic stem cells also did not improve ejection fraction (P = 0.11), but did prevent a further decline in ejection fraction (P = 0.001). Delivery of guided unrestricted somatic stem cells significantly improved ejection fraction (P = 0.03). Guided unrestricted somatic stem cells restored function to a greater extent than mesenchymal stem cells (P = 0.03). The infarct area (P = 0.2), apoptosis (P = 0.07) and angiogenesis (P = 0.09) did not differ between groups. Microarray analysis revealed that, following pre-implantation guiding, the gene groupings of mitosis, signalling and angiogenesis were highly overrepresented, mediators of apoptosis were overrepresented, and cardiomyocyte-associated genes were not differentially expressed. CONCLUSIONS: These results suggest that guided unrestricted somatic stem cells have a moderate capacity to repair cardiac damage and that they are more effective than mesenchymal stem cells in restoring cardiac function after a myocardial infarction. The mechanism of the benefit was not fully elucidated in this study, but these observations may be mediated by favorable dysregulation of angiogenic and apoptotic gene groupings. BioMed Central 2012-09-13 /pmc/articles/PMC3580427/ /pubmed/22974654 http://dx.doi.org/10.1186/scrt127 Text en Copyright ©2012 Flynn et al.; licensee BioMed Central Ltd. http://creativecommons.org/licenses/by/2.0 This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Research
Flynn, Aidan
Chen, Xizhe
O'Connell, Enda
O'Brien, Timothy
A comparison of the efficacy of transplantation of bone marrow-derived mesenchymal stem cells and unrestricted somatic stem cells on outcome after acute myocardial infarction
title A comparison of the efficacy of transplantation of bone marrow-derived mesenchymal stem cells and unrestricted somatic stem cells on outcome after acute myocardial infarction
title_full A comparison of the efficacy of transplantation of bone marrow-derived mesenchymal stem cells and unrestricted somatic stem cells on outcome after acute myocardial infarction
title_fullStr A comparison of the efficacy of transplantation of bone marrow-derived mesenchymal stem cells and unrestricted somatic stem cells on outcome after acute myocardial infarction
title_full_unstemmed A comparison of the efficacy of transplantation of bone marrow-derived mesenchymal stem cells and unrestricted somatic stem cells on outcome after acute myocardial infarction
title_short A comparison of the efficacy of transplantation of bone marrow-derived mesenchymal stem cells and unrestricted somatic stem cells on outcome after acute myocardial infarction
title_sort comparison of the efficacy of transplantation of bone marrow-derived mesenchymal stem cells and unrestricted somatic stem cells on outcome after acute myocardial infarction
topic Research
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3580427/
https://www.ncbi.nlm.nih.gov/pubmed/22974654
http://dx.doi.org/10.1186/scrt127
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