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Personne :
Guillemette, Maxime.

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Guillemette

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Maxime.

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Département de physique, de génie physique et d'optique, Faculté des sciences et de génie, Université Laval

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Voici les éléments 1 - 3 sur 3
  • PublicationAccès libre
    Recent advances in the development of tissue-engineered vascular media made by self-assembly
    (Elsevier, 2013-06-05) Guillemette, Maxime.; Laterreur, Véronique; Germain, Lucie; Ruel, Jean; Miville Godin, Caroline; Bourget, Jean-Michel; Mounier, Maxence; Veres, Teodor; Auger, François A.; Gauvin, Robert
    There is a lack of an optimal transplant material for small calibre blood vessels. This could be overcome by tissue engineering. The optimal construct is to be derived from autologous cells and present mechanical resistance comparable to the gold standard, autologous vessels such as the internal mammary artery or the saphenous vein. Our laboratory has developed the self-assembly approach to produce tissue sheets that can be rolled into such vessel substitutes. Over the years, many improvements have been made to the technique to facilitate smooth muscle cell culture and to produce vascular media substitutes with higher circumferential mechanical resistance.
  • PublicationRestreint
    Microstructured human fibroblast-derived extracellular matrix scaffold for vascular media fabrication
    (John Wiley & Sons, Inc, 2016-04-28) Guillemette, Maxime.; Tondreau, Maxime; Laterreur, Véronique; Germain, Lucie; Miville-Godin, Caroline; Ruel, Jean; Mounier, Maxence; Tremblay, Catherine; Labbé, Raymond; Bourget, Jean-Michel; Veres, Teodor; Auger, François A.; Gauvin, Robert
    In the clinical and pharmacological fields, there is a need for the production of tissue-engineered small-diameter blood vessels. We have demonstrated previously that the extracellular matrix (ECM) produced by fibroblasts can be used as a scaffold to support three-dimensional (3D) growth of another cell type. Thus, a resistant tissue-engineered vascular media can be produced when such scaffolds are used to culture smooth muscle cells (SMCs). The present study was designed to develop an anisotropic fibroblastic ECM sheet that could replicate the physiological architecture of blood vessels after being assembled into a small diameter vascular conduit. Anisotropic ECM scaffolds were produced using human dermal fibroblasts, grown on a microfabricated substrate with a specific topography, which led to cell alignment and unidirectional ECM assembly. Following their devitalization, the scaffolds were seeded with SMCs. These cells elongated and migrated in a single direction, following a specific angle relative to the direction of the aligned fibroblastic ECM. Their resultant ECM stained for collagen I and III and elastin, and the cells expressed SMC differentiation markers. Seven days after SMCs seeding, the sheets were rolled around a mandrel to form a tissue-engineered vascular media. The resulting anisotropic ECM and cell alignment induced an increase in the mechanical strength and vascular reactivity in the circumferential direction as compared to unaligned constructs.
  • PublicationRestreint
    Tissue-Engineered Vascular Adventitia with Vasa Vasorum Improves Graft Integration and Vascularization Through Inosculation
    (2010-05-05) Guillemette, Maxime.; Perron, Cindy; Germain, Lucie; Labbé, Raymond; Auger, François A.; Gauvin, Robert
    Tissue-engineered blood vessel is one of the most promising living substitutes for coronary and peripheral artery bypass graft surgery. However, one of the main limitations in tissue engineering is vascularization of the construct before implantation. Such a vascularization could play an important role in graft perfusion and host integration of tissue-engineered vascular adventitia. Using our self-assembly approach, we developed a method to vascularize tissue-engineered blood vessel constructs by coculturing endothelial cells in a fibroblast-laden tissue sheet. After subcutaneous implantation, enhancement of graft integration within the surrounding environment was noted after 48 h and an important improvement in blood circulation of the grafted tissue at 1 week postimplantation. The distinctive branching structure of end arteries characterizing the in vivo adventitial vasa vasorum has also been observed in long-term postimplantation follow-up. After a 90-day implantation period, hybrid vessels containing human and mouse endothelial cells were still perfused. Characterization of the mechanical properties of both control and vascularized adventitia demonstrated that the ultimate tensile strength, modulus, and failure strain were in the same order of magnitude of a pig coronary artery. The addition of a vasa vasorum to the tissue-engineered adventitia did not influence the burst pressure of these constructs. Hence, the present results indicate a promising answer to the many challenges associated with the in vitro vascularization and in vivo integration of many different tissue-engineered substitutes.