Interspecies differences with in vitro and in vivo models of vascular tissue engineering.
In arterial replacement there is a clear clinical need for a functional substitute possessing appropriate haemocompatible properties to be implanted as small diameter artery. Endothelial cell seeding constitutes an appreciated method to improve blood compatibility on the condition that cells firmly adhere to the support. Along this way, an innovative technique based on multilayered polyelectrolyte films (PEM) as cell adhesive substrate was previously validated in vitro and in vivo in a small-animal model. In this study, we extended the work on a larger animal (sheep) to validate furthermore the paradigm of PEM functionalization for vascular substitutes. We tested in vitro: the efficiency of PEM to induce endothelial progenitor differentiation in sheep endothelial cells; the ability of PEM to sustain cell proliferation and allow resistance to shear stress; the fate of PEM-coated de-endothelialized human saphenous veins under flow conditions, a prerequisite step before in vivo experiments. Despite in vitro differences we were encouraged by testing in vivo PEM-coated prosthesis as carotid replacement in sheep, but without success. In order to explain the implantation failure, an in vitro haemocompatibility evaluation was performed that highlighted interspecies differences able to explain, at least in part, the graft failure obtained.
Univ. Bordeaux, Bioingénierie Tissulaire, U1026, F-33000 Bordeaux, France; INSERM, Bioingénierie Tissulaire, U1026, F-33000 Bordeaux, France. Electronic address: murielle.remy@u-bordeaux2.fr.
Murielle
M
Rémy
Marlène
M
Durand
Patrick
P
Menu
Jean Claude
JC
Voegel
Jean François
JF
Ponsot
Xavier
X
Bérard
Marie Françoise
MF
Harmand
Laurence
L
Bordenave
D000818:Animals; D001807:Blood Vessel Prosthesis; D049109:Cell Proliferation; D002478:Cells, Cultured; D006801:Humans; D008858:Microscopy, Phase-Contrast; D011108:Polymers / Q000737:chemistry; D033081:Shear Strength; D012756:Sheep; D023822:Tissue Engineering / Q000379:methods*; D054457:Tissue Scaffolds / Q000737:chemistry
D011108:Polymers
Animal model; Cell culture; Haemocompatibility; Multilayered polyelectrolyte films; Vascular prosthesis