Personne : Veres, Teodor
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Veres
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Teodor
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Département de chirurgie, Faculté de médecine, Université Laval
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Publication Accès 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, RobertThere 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.Publication Restreint Surface topography induces 3D self-orientation of cells and extracellular matrix resulting in improved tissue function(RSC Pub., 2009-01-15) Guillemette, Maxime.; Cui, Bo; Germain, Lucie; Roy, Emmanuel; Veres, Teodor; Auger, François A.; Giasson, Claude J.; Gauvin, Robert; Esch, Mandy B.; Carrier, Patrick; Deschambeault, Alexandre; Dumoulin, Michel; Toner, MehmetThe organization of cells and extracellular matrix (ECM) in native tissues plays a crucial role in their functionality. However, in tissue engineering, cells and ECM are randomly distributed within a scaffold. Thus, the production of engineered-tissue with complex 3D organization remains a challenge. In the present study, we used contact guidance to control the interactions between the material topography, the cells and the ECM for three different tissues, namely vascular media, corneal stroma and dermal tissue. Using a specific surface topography on an elastomeric material, we observed the orientation of a first cell layer along the patterns in the material. Orientation of the first cell layer translates into a physical cue that induces the second cell layer to follow a physiologically consistent orientation mimicking the structure of the native tissue. Furthermore, secreted ECM followed cell orientation in every layer, resulting in an oriented self-assembled tissue sheet. These self-assembled tissue sheets were then used to create 3 different structured engineered-tissue: cornea, vascular media and dermis. We showed that functionality of such structured engineered-tissue was increased when compared to the same non-structured tissue. Dermal tissues were used as a negative control in response to surface topography since native dermal fibroblasts are not preferentially oriented in vivo. Non-structured surfaces were also used to produce randomly oriented tissue sheets to evaluate the impact of tissue orientation on functional output. This novel approach for the production of more complex 3D tissues would be useful for clinical purposes and for in vitro physiological tissue model to better understand long standing questions in biology.Publication Restreint 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, RobertIn 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.