Document Detail

Aged human cells rejuvenated by cytokine enhancement of biomaterials for surgical ventricular restoration.
MedLine Citation:
PMID:  23153846     Owner:  NLM     Status:  In-Data-Review    
OBJECTIVES: This study investigated whether cytokine enhancement of a biodegradable patch could restore cardiac function after surgical ventricular restoration (SVR) even when seeded with cells from old donors.
BACKGROUND: SVR can partially restore heart size and improve function late after an extensive anterior myocardial infarction. However, 2 limitations include the stiff synthetic patch used and the limited healing of the infarct scar in aged patients.
METHODS: We covalently immobilized 2 proangiogenic cytokines (vascular endothelial growth factor and basic fibroblast growth factor) onto porous collagen scaffolds. We seeded human mesenchymal stromal cells from young (50.0 ± 8.0 years, N = 4) or old (74.5 ± 7.4 years, N = 4) donors into the scaffolds, with or without growth factors. The patches were characterized and used for SVR in a rat model of myocardial infarction. Cardiac function was assessed.
RESULTS: In vitro results showed that cells from old donors grew slower in the scaffolds. However, the presence of cytokines modulated the aging-related p16 gene and enhanced cell proliferation, converting the old cell phenotype to a young phenotype. In vivo studies showed that 28 days after SVR, patches seeded with cells from old donors did not induce functional recovery as well as patches seeded with young cells. However, cytokine-enhanced patches seeded with old cells exhibited preserved patch area, prolonged cell survival, and augmented angiogenesis, and rats implanted with these patches had better cardiac function. The patch became an elastic tissue, and the old cells were rejuvenated.
CONCLUSIONS: This sustained-release, cytokine-conjugated system provides a promising platform for engineering myocardial tissue for aged patients with heart failure.
Kai Kang; Lu Sun; Yun Xiao; Shu-Hong Li; Jun Wu; Jian Guo; Shu-Ling Jiang; Lei Yang; Terrence M Yau; Richard D Weisel; Milica Radisic; Ren-Ke Li
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of the American College of Cardiology     Volume:  60     ISSN:  1558-3597     ISO Abbreviation:  J. Am. Coll. Cardiol.     Publication Date:  2012 Nov 
Date Detail:
Created Date:  2012-11-16     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8301365     Medline TA:  J Am Coll Cardiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2237-49     Citation Subset:  AIM; IM    
Copyright Information:
Copyright © 2012 American College of Cardiology Foundation. Published by Elsevier Inc. All rights reserved.
Department of Cardiovascular Surgery, the Second Affiliated Hospital of Harbin Medical University, Harbin, China; Division of Cardiovascular Surgery and Toronto General Research Institute, University Health Network and Department of Surgery, Division of Cardiac Surgery, University of Toronto, Toronto, Ontario, Canada.
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