| Development of a hybrid cardiovascular graft using a tissue engineering approach. | |
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MedLine Citation:
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PMID: 12039860 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Tissue engineering of endothelial cells (EC) and chemical engineering with anticoagulant moieties has been undertaken in order to improve prosthetic graft patency and thrombogenicity. This was done by covalently bonding a compliant poly(carbonate-urea)urethane graft (MyoLink) with arginine-glycine-aspartate (RGD) or/and heparin (Hep) to ascertain whether EC retention could be improved. The retention of these moieties and EC was assessed after exposure to pulsatile flow. We covalently bonded RGD, Hep, and RGD/Hep onto the luminal surface of MyoLink using spacer arm technology. Narrow-beam X-ray photoelectron spectroscopy was carried out to check the efficiency of the bonding. EC were radiolabeled and seeded onto native MyoLink and with 1) RGD-, 2) Hep-, and 3) RGD/Hep-bonded grafts and exposed to shear stress in a physiological flow circuit for 6 h, which reproduces femoral artery flow waveforms and pulsatility. Results were recorded on a gamma camera imaging system. Viability of cells was tested with a modified Alamar Blue assay (ABA) and scanning electron microscopy for morphological appearance of seeded cells. Experiments were repeated (n=6). RGD, Hep, and RGD/Hep were bonded together in a uniform distribution on the luminal surface of each graft type, and bioactivity of each moiety covalently bonded was very high. In the flow circuit, there was exponential cell retention for the first 60 min of flow for all the grafts, but after 6 h of exposure to pulsatile flow the RGD/Hep-bonded graft had a significantly better cell retention rate than native MyoLink (75.7%+/-2.3 vs. 60.5+/-10.1, P<0.05). ABA test showed that all the seeded cells postexposure to flow were viable, and significantly higher metabolic activity was recorded on a RGD/Hep-bonded graft than with MyoLink-seeded graft (P<0.01). Using RGD/Hep covalently bonded onto graft surfaces improves cell retention and provides an antithrombogenic surface for initial blood flow in vivo until full EC activity develops postseeding. This would allow the development and further improvement of hybrid grafts. |
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Authors:
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Alok Tiwari; Henryk J Salacinski; Geoffrey Punshon; George Hamilton; Alexander M Seifalian |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: FASEB journal : official publication of the Federation of American Societies for Experimental Biology Volume: 16 ISSN: 1530-6860 ISO Abbreviation: FASEB J. Publication Date: 2002 Jun |
Date Detail:
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Created Date: 2002-05-31 Completed Date: 2002-06-07 Revised Date: 2012-02-15 |
Medline Journal Info:
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Nlm Unique ID: 8804484 Medline TA: FASEB J Country: United States |
Other Details:
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Languages: eng Pagination: 791-6 Citation Subset: IM |
Affiliation:
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Tissue Engineering Center, University Department of Surgery, Royal Free and University College Medical School, University College London and The Royal Free Hospital, London, UK. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Blood Vessel Prosthesis* Cell Adhesion / physiology Cell Survival Cells, Cultured Endothelium, Vascular / cytology, physiology* Fibronectins / chemistry, metabolism Heparin / chemistry Humans Oligopeptides / chemistry Polytetrafluoroethylene / chemistry Polyurethanes / chemistry Tissue Engineering / methods* |
| Chemical | |
Reg. No./Substance:
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0/Fibronectins; 0/Oligopeptides; 0/Polyurethanes; 9002-84-0/Polytetrafluoroethylene; 9005-49-6/Heparin; 99896-85-2/arginyl-glycyl-aspartic acid |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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