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, Résumé

, Il s'oriente particulièrement sur la composante cellulaire de ces substituts. L'usage de cellules souches mésenchymateuses issues de cordons ombilicaux (CSM-GW) implique de déterminer quels facteurs obstétricaux, liés à l'environnement direct et indirect des CSM-GW, peuvent influencer leur prolifération ainsi que leur différenciation chondrocytaire Dans une première partie de ce travail, trois types de facteurs ont été étudiés : les facteurs liés à l'enfant donneur, au déroulement de l'accouchement et de la délivrance, à la grossesse et à la mère. Nos données montrent que les CSM-GW ont des capacités prolifératives améliorées lorsque l'accouchement s'est déroulé à terme et sans complication, avec utilisation de Syntocinon® pendant le travail. Sur la base de ces résultats, nous avons utilisé les CSM-GW les plus efficaces dans le cadre de l'ingénierie du cartilage. Il a ensuite été essentiel d'élucider le profil d'action des CSM-GW dans un contexte allogénique. Le deuxième temps de ce travail a donc consisté à chercher le profil de stimulation le plus performant, au regard de la viabilité des cellules et de l'évolution de la sécrétion des facteurs solubles responsables des propriétés immunomodulatrices des CSM-GW au cours de la différenciation chondrocytaire. Nous avons alors mimé, Ce travail a pour objet de déterminer les conditions optimales de production de substituts allogéniques capables de combler les lésions cartilagineuses dans le cadre du traitement de l'arthrose vitro et en biomatériaux d'Alginate/Acide hyaluronique (Alg/HA) une telle situation en stimulant les CSM-GW avec différentes doses d'IFN-? et de TNF-?. Selon nos résultats, la stimulation par IFN-? et TNF-? sur les CSM-GW en biomatériaux d'Alg/HA est plus efficace lorsque ces deux cytokines sont utilisées conjointement et n'est pas délétère pour la viabilité cellulaire aux concentrations respectives de 20 et, p.30

/. Ng, ne modifie pas leur sécrétion de TGF-?, et diminue la sécrétion de VEGF. Nous avons confirmé ces données lors d'une mise en situation fonctionnelle : des cocultures avec des cellules mononucléées de sang périphérique (PBMC) de donneurs sains nous ont permis d'évaluer la réponse des CSM-GW lors d'une situation allogénique. Ces mises en situations allogéniques ont été étudiées à différents temps afin d'évaluer les propriétés immunologiques des CSM-GW au cours du temps passé en biomatériaux. Nos résultats montrent que les CSM-GW peuvent exprimer des molécules HLA-G ainsi qu'IDO, mais ces expressions sont limitées en biomatériaux d'Alg//HA. Les CSM-GW en biomatériaux d'Alg/HA en situation allogénique ne sont pas immunogènes, quel que soit le temps de différenciation. En revanche, leurs capacités immunomodulatrices décroissent au cours du temps et sont plus fortes à J0 et J3 de la différenciation chondrocytaire, ce qui oriente vers une utilisation précoce de ces cellules. Les conclusions de ce travail permettent de (i) sélectionner les cordons idoines à l'ingénierie cellulaire et l'ingénierie du cartilage, Cette double stimulation induit une augmentation de la sécrétion d'IL-6 et de PGE-2 par les CSM-GWii) définir les conditions permettant de mimer une situation allogénique in vitro, (iii) connaitre les propriétés immunomodulatrices des CSM-GW au cours de la culture en biomatériaux d'Alg

, Mots clefs : cellules souches mésenchymateuses, propriétés immunomodulatrices, différenciation chondrocytaire, biomatériaux, allogreffe

, The use of mesenchymal stem cells from umbilical cords (WJ-MSC) involves determining which factors, related to direct and indirect environment of the WJ-MSC, can influence their proliferation and chondrogenic differentiation In a first part of our work, three types of factors were studied: related to the donor child, the course of labor and delivery, pregnancy and the mother Our results show that WJ-MSC have enhanced proliferative capacities when coming from full-term birth and without complications, with the use of Syntocinon® during labor. On this basis, we used the most effective WJ-MSC for cartilage engineering. It was then essential to elucidate their action profile in allogeneic context. We stimulated WJ- MSC embedded in Alginate/Hyaluronic Acid (Alg/HA) scaffolds with different concentrations of IFN-? and TNF-? in order to determine the most effective stimulation profile, with regard to viability of the cells and evolution of immunomodulatory soluble factors secretion. According to our results, the stimulation by IFN-? and TNF-? on WJ-MSC in Alg/HA scaffolds is more effective when these two cytokines are used together and is not deleterious for cell viability at the concentrations of 20 and 30 ng/mL, respectively. This double stimulation induces an increase in the secretion of IL-6 and PGE-2 by the WJ-MSC, a decrease in the secretion of VEGF and does not modify the secretion of TGF-?. We confirmed these data during a functional study: cocultures with peripheral blood mononuclear cells (PBMC) from healthy donors allowed us to evaluate the response of WJ-MSC in an allogeneic situation. These allogeneic situations have been studied at different times to evaluate the immunological properties of WJ-MSC during the time of chondrogenic differentiation. Our results show that WJ-MSC can express HLA-G molecules as well as IDO, but these expressions are, Abstract The purpose of this work is to determine the optimal conditions for allogeneic substitutes production, adapted to filling the cartilaginous lesions in osteoarthritis treatment. It focuses on the cellular component of these substitutes Alg/HA biomaterials. Finally, the WJ-MSC in Alg/HA biomaterials in allogeneic conditions are not immunogenic, regardless of the time of differentiation. On the other hand, their immunomodulatory capacities decrease over time and are stronger at day 0 and day 3 of chondrogenic differentiation, which leads to an early use of these cells. Finally, this work allows us to (i) select the umbilical cords suitable for cellular and cartilage engineeringii) define the conditions mimicking in vitro an allogeneic situationiii) elucidate the immunomodulatory properties of WJ-MSC during Alg/HA biomaterials chondrogenic differentiation, including allogeneic situations

, Keywords: mesenchymal stromal cells, immunomodulatory properties, chondrogenic differentiation, biomaterial, allograft, advanced therapy medicinal products