Cyclically stretching developing tissue in vivo enhances mechanical strength and organization of vascular grafts

Stickler, P., De Visscher, G., Mesure, L., Famaey, N., Martin, D., Campbell, J. H., Van Oosterwyck, H., Meuris, B. and Flameng, W. (2010) Cyclically stretching developing tissue in vivo enhances mechanical strength and organization of vascular grafts. Acta Biomaterialia, 6 7: 2448-2456. doi:10.1016/j.actbio.2010.01.041


Author Stickler, P.
De Visscher, G.
Mesure, L.
Famaey, N.
Martin, D.
Campbell, J. H.
Van Oosterwyck, H.
Meuris, B.
Flameng, W.
Title Cyclically stretching developing tissue in vivo enhances mechanical strength and organization of vascular grafts
Journal name Acta Biomaterialia   Check publisher's open access policy
ISSN 1742-7061
1878-7568
Publication date 2010-07
Sub-type Article (original research)
DOI 10.1016/j.actbio.2010.01.041
Volume 6
Issue 7
Start page 2448
End page 2456
Total pages 9
Place of publication Amsterdam, Netherlands ; New York, NY, United States
Publisher Elsevier Science
Collection year 2011
Language eng
Formatted abstract
Tissue-engineered vascular grafts must have qualities that rival native vasculature, specifically the ability to remodel, the expression of functional endothelial components and a dynamic and functional extracellular matrix (ECM) that resists the forces of the arterial circulation. We have developed a device that when inserted into the peritoneal cavity, attracts cells around a tubular scaffold to generate autologous arterial grafts. The device is capable of cyclically stretching (by means of a pulsatile pump) developing tissue to increase the mechanical strength of the graft. Pulsed (n = 8) and unpulsed (n = 8) devices were implanted for 10 days in Lovenaar sheep (n = 8). Pulsation occurred for a period of 5–8 days before harvest. Thick unadhered autologous tissue with cells residing in a collagen ECM was produced in all devices. Collagen organization was greater in the circumferential direction of pulsed tissue. Immunohistochemical labelling revealed the hematopoietic origin of >90% cells and a significantly higher coexpression with vimentin in pulsed tissue. F-actin expression, mechanical failure strength and strain were also significantly increased by pulsation. Moreover, tissue could be grafted as carotid artery patches. This paper shows that unadhered tissue tubes with increased mechanical strength and differentiation in response to pulsation can be produced with every implant after a period of 10 days. However, these tissue tubes require a more fine-tuned exposure to pulsation to be suitable for use as vascular grafts.
Copyright © 2010 Acta Materialia Inc.
Keyword Tissue engineering
Arterial grafts
Implantable bioreactor
Cyclic stress
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

 
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Created: Sun, 04 Jul 2010, 00:08:17 EST