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    Development and characterisation of a large diameter decellularised vascular allograft

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    Publication date
    2018-09
    Author
    Aldridge, A.
    Desai, A.
    Owston, H.
    Jennings, L.M.
    Fisher, J.
    Rooney, P.
    Kearney, J.N.
    Ingham, E.
    Wilshaw, Stacy-Paul
    Keyword
    Decellularisation; Acellular; Scaffold; Aorta
    Rights
    © 2018 The Authors. This is an Open Access article distributed under the Creative Commons CC-BY license (http://creativecommons.org/licenses/by/4.0/)
    Peer-Reviewed
    Yes
    
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    Abstract
    The aims of this study were to develop a biological large diameter vascular graft by decellularisation of native human aorta to remove the immunogenic cells whilst retaining the essential biomechanical, and biochemical properties for the ultimate benefit of patients with infected synthetic grafts. Donor aortas (n = 6) were subjected to an adaptation of a propriety decellularisation process to remove the cells and acellularity assessed by histological analysis and extraction and quantification of total DNA. The biocompatibility of the acellular aortas was determined using standard contact cytotoxicity tests. Collagen and denatured collagen content of aortas was determined and immunohistochemistry was used to determine the presence of specific extracellular matrix proteins. Donor aortas (n = 6) were divided into two, with one half subject to decellularisation and the other half retained as native tissue. The native and decellularised aorta sections were then subject to uniaxial tensile testing to failure [axial and circumferential directions] and suture retention testing. The data was compared using a paired t-test. Histological evaluation showed an absence of cells in the treated aortas and retention of histoarchitecture including elastin content. The decellularised aortas had less than 15 ng mg−1 total DNA per dry weight (mean 94% reduction) and were biocompatible as determined by in vitro contact cytotoxicity tests. There were no gross changes in the histoarchitecture [elastin and collagen matrix] of the acellular aortas compared to native controls. The decellularisation process also reduced calcium deposits within the tissue. The uniaxial tensile and suture retention testing revealed no significant differences in the material properties (p > 0.05) of decellularised aorta. The decellularisation procedure resulted in minimal changes to the biological and biomechanical properties of the donor aortas. Acellular donor aorta has excellent potential for use as a large diameter vascular graft.
    URI
    http://hdl.handle.net/10454/14152
    Version
    Published version
    Citation
    Aldridge A, Desai A, Owston H et al (2018) Development and characterisation of a large diameter decellularised vascular allograft. Cell Tissue Bank. 19(3): 287-300.
    Link to publisher’s version
    https://doi.org/10.1007/s10561-017-9673-y
    Type
    Article
    Collections
    Life Sciences Publications

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