Document Detail


Age-dependent availability and functionality of bone marrow stem cells in an experimental model of acute and chronic myocardial infarction.
MedLine Citation:
PMID:  21535915     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
The aim of this study was to investigate the effect of aging and timing of left ventricular ischemic injury on the availability and functionality of stem cells. We studied young and aged male inbred Lewis rats that were used as donors of bone marrow mononuclear cells (BM-MNCs), divided in four experimental groups: controls, sham operated, 48 h post-myocardial infarction (MI), and 28 days post-MI. In vitro studies included flow cytometry analysis, hematopoietic colony-forming capacity, and invasion assays of migration capacity. BM-MNCs from these groups were transplanted in female rats after MI induction. Late engraftment was evaluated by real-time PCR of the SRY chromosome. Percentage of CD34(+)/CD45(+low) cells was similar among different experimental groups in young rats, but was significantly higher in aged animals (p < 0.001), particularly 28 days post-MI. KDR(+)/CD34(+) cells were increased 48 h after MI and decreased 28 days post-MI in young animals, while they were profoundly reduced in the aged group (p < 0.001). Triple staining for CD44(+)/CD29(+)/CD71(+) cells was similar in different groups of aged rats, but we observed an intense increase 48 h post-MI in young animals. Colony-forming units and cytokine-induced migration were significantly attenuated 28 days after the MI. Late engraftment in infarcted transplanted female hearts was present, but considerably heterogeneous. Finally, recovery of left ventricular systolic function in transplanted female recipients was significantly influenced by donors' BM-MNCs groups (p < 0.01). We have demonstrated that aging and timing of myocardial injury are factors that may act synergistically in determining stem cell availability and function. Such interaction should be considered when planning new cell therapy strategies for acute and chronic ischemic heart disease in the clinical arena.
Authors:
Ana Ayala-Lugo; Angela M V Tavares; Ana H R Paz; Ana Alegretti; Ludmila Miquelito; Hugo Bock; Roberto Giugliani; Nadine Clausell; Elizabeth Cirne-Lima; Luis E Rohde
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Cell transplantation     Volume:  20     ISSN:  1555-3892     ISO Abbreviation:  Cell Transplant     Publication Date:  2011  
Date Detail:
Created Date:  2011-05-03     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9208854     Medline TA:  Cell Transplant     Country:  United States    
Other Details:
Languages:  eng     Pagination:  407-19     Citation Subset:  IM    
Affiliation:
Embriology and Cell Differentiation Laboratory, Hospital de Clínicas de Porto Alegre, Porto Alegre, Brazil.
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