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Le Figaro Santé

Entretien avec le PR Jérôme Guicheux "des cellules souches pour régénérer le cartilage"

Et si l’on pouvait un jour remplacer les cartilages pour le grand bien des articulations ?
Biomatériaux et transplantations de cellules ouvrent des perspectives.

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Consulter l'article sur le figaro santé




Bande dessinée BD InScience

Présentation du projet Overbone porté par Valérie Geoffroy

Voir la présentation du projet

Voir les tomes 1 et 2


TERMIS Fellows 2024

Catherine Le Visage was elected as a Fellow of Tissue Engineering and Regenerative Medicine (FTERM) for the 2024 Class. FTERM was established to recognize an individual's role in shaping the tissue engineering and regenerative medicine field and TERMIS.



Rencontre et débat

[De l'eau dans le gaz] Une nouvelle thérapie pour soulager l'arthrose avec Garance Saint-Pe et Léa Terriac

Léa Terriac et Garance Saint Pe sont doctorantes au laboratoire RMeS de Nantes (Nantes Université). Leur recherche se concentre sur l'élaboration de nouveaux traitements destinés à soulager les douleurs de l'arthrose en utilisant un hydrogel. Nous explorerons leur travail sur le développement de ces traitements et dans la mise au point des techniques d'administration associées.

L'arthrose est une maladie invalidante qui touche une part considérable de la population. Ensemble, nous plongerons dans les mécanismes de cette pathologie et découvrirons les espoirs que suscitent ces nouvelles thérapies.

L'émission a été diffusée le 22 mai à 15h00 sur la chaine Twitch d'EchoSciences Pays de la Loire  twitch.tv/echosciencespdl
Un replay est disponible ici : https://www.twitch.tv/videos/2152245947

 

Projet AMI ingénierie & santé DECISION
moDèle mathEmatique prédiCtif de matériaux de régénératIon oSseuse antIbactériens pOur le traitement de la péri-implaNtite.

Résumé : Les infections péri-implantaires sont une complication très répandue en raison de l’exposition permanente aux germes infectieux. De plus, la péri-implantite (PI) a été qualifiée de pathologie majeure en raison de l’absence de protocole de traitement standardisé. La principale raison est une décontamination insuffisante de la surface de l’implant. Dans ce contexte, les matériaux composites injectables se présentent comme une approche clinique intéressante. Ce concept repose sur l’utilisation de biomatériaux composites ostéoconducteurs associés à des molécules antibactériennes (généralement des antibiotiques). Compte tenu de la préoccupation mondiale de la résistance aux antimicrobiens, nous avons émis l’hypothèse du remplacement de l’antibiotique par des polymères antibactériens. Nous développerons un matériau composite antibactérien (MCA) avec : l’acide hyaluronique silanisé comme matrice polymérique et le phosphate de calcium biphasique comme matrice ostéoconductrice avec différentes quantités de biopolymères antimicrobiens. Dans ce projet, notre objectif est de mettre au point un traitement médical personnalisé. Pour y parvenir, l’originalité de notre projet consiste à développer un modèle mathématique capable d’approcher le comportement de nos MCA dans leur environnement afin de prédire leur efficacité. In fine, l’objectif est de pouvoir associer ce modèle avec les données cliniques des patients afin de prédire quel MCA devra être utilisé selon la situation clinique du patient.
Porteur : RMeS : Gildas RETHORE
Partenaires : GEM : (Central) Gregory Legrain, Baptiste Girault
                        IMN : Stéphane Cuenot
 

OLYMPiC2024

The REJOINT team is pleased to announce the funding of the "Novel strategies for Osteoarthritis treatment based on innate LYMPhoid Cells modulation (OLYMPiC2024)" ANR/DFG PRCI project, coordinated by Marie-Astrid Boutet (StratOA group, RMeS) and Irene Mattiola (Institute of Microbiology, Infectious Diseases and Immunology, Charité Universitätsmedizin, Berlin, Germany).

The OLYMPiC2024 project aims to:
- Decipher the diversity and spatial distribution of innate lymphoid cells (ILC) in joint tissues at different stages of OA and the correlation with the clinical features of the patients.
- Investigate the contribution of ILC subsets to the pathophysiology of OA and evaluating therapeutic agents aimed at modulating ILC activation in OA models.
- Study the role of the microbiota-dependent regulation of ILC in relevant models of OA, to bring the proof of concept for a diet-based microbiota/ILC-modulating strategy in OA dog patients.

TARMac Project

The REJOINT team is delighted to announce the funding of the TARMac project in the framework of the “Equipe FRM 2023” (Medical Research Foundation Team 2023). The FRM Team-TARMac will be coordinated by Jerome Guicheux with Marie-Astrid Boutet as a co-coordinator.
Involving more than 15 collaborators from the Rejoint team, TARMac will also benefit from the expertise of the Pitzalis’ Lab (London, UK), Escriou’s lab (Paris, FR) as well as the Preclinical Research and Investigation Center (CRIP) at the Oniris Vet school (Nantes, FR).
Our team will receive a 3-years funding starting in 2024 and aiming at better understanding macrophages diversity in the synovial tissue to help accurately stratify osteoarthritis (OA) patients, and design novel and efficient RNA-based treatments with a personalized approach. TARMac is organized into 3 work packages (WP) as follow:
- WP1. Characterise the synovial MΦ heterogeneity and its association with the disease phenotype and severity to develop a stratification for OA patients.
- WP2. Validate an innovative drug delivery strategy that allows the sustained release of therapeutic RNAs to efficiently modulate MΦ pathogenesis in OA joints.
- WP3. Bring the proof of concept that modulating the activity of specific MΦ subsets in murine models of OA efficiently prevents disease progression and bring the proof of safety in dogs.
This project, which involves multiple technologies and covers a broad range of our team members’ expertise along with a strong collaborative network, possesses all the ingredients for advancing scientific research in OA with a huge potential to accelerate the translation of basic scientific observations into patients’ benefits.

PEPR CARN

As part of France 2030's acceleration strategies, one action is dedicated to the funding of translational research through the Priority Research Programs and Equipment (PEPR). The REJOINT team is delighted to announce a PEPR funding within the Biotherapies and Bioproduction of Innovative Therapies (BBiT) program. UMR 7057-MSC (F. Gazeau) and UMR 1229-RMeS (J. Guicheux) will co-lead the CARN project (3.5 M€) dedicated to the development of biotherapies based on the local delivery of therapeutic RNA by functionalized hybrid extracellular vesicles (EVs) for joint diseases. This project will also involve the UMR 8612 (E. Fattal), UMR 5253 (M. Morille), UMS 55-ART ARNm (C. Pichon) and UMR 1183-IRMB (C. Jorgensen).

CARN is a 4 year-project with a kick-off official date August 31, 2023.

It is organized into 5 workpackages (WP) as follows :

-WP1. Identification and validation of therapeutic RNAs for knee and intervertebral disc osteoarthritis. Leaders Claire Vinatier & Danièle Noel
-WP2. High yield production of mesenchymal stromal cells-derived EVs and RNAs and per-production hybridization of EVs and RNA. Leaders: Chantal Pichon & Florence Gazeau
-WP3. Engineering, optimization and functionalization of hybrid EVs. Leaders: Elias Fattal & Marie Morille
-WP4. Efficacy evaluation of hybrid EVs in vitro and in the zebrafish model. Leaders: Farida Djouad & Jerome Guicheux
-WP5. Pre-clinical studies in small (mice) and large (sheep) animal models of knee and disc osteoarthritis. Leaders: Catherine Le Visage & Christian Jorgensen

By proposing functionalized hybrid EVs decorated with recognition elements and loaded with disease-modifying therapeutic RNAs, CARN will open new therapeutic opportunities for hybrid EVs in the treatment of chronic inflammatory joint diseases.


Fondation d’entreprise Grand Ouest – Prix encouragement recherche – Projet ANDROID2

The REGOS team of the INSERM U1229-RMeS laboratory is pleased to announce the recent award to Guillaume MABILLEAU (INSERM U1229, RMeS) from the Fondation d’entreprise Grand Ouest. This award will help to pursue the development of dual GIP/GLP-2 analogues for the prevention and treatment of bone fragility.

 

Fondation Arthritis - SPOTT project

The REJOINT team is pleased to announce the funding of the "SPatial multi-Omic profiling of synovial tissue to uncover novel Therapeutic Targets in osteoarthritis (SPOTT)" project, coordinated by Marie-Astrid Boutet (StratOA group).

The SPOTT project aims to:
(i) Analyse the spatial multi-omic profile of OA synovial tissue to refine patients’ stratification,
(ii) Validate the expression of identified cellular or molecular targets for the future development of innovative therapeutic strategies.
SPOTT is an emergent project, which implements for the first-time breakthrough conceptual and technological approaches and will facilitate the development of larger impactful projects in the context of OA and beyond with a huge potential to accelerate the translation of basic scientific observations into patients’ benefits.

 

ANR PVNS

Pigmented villonodular synovitis (PVNS) is a rare joint disease characterized by a benign proliferative lesion arising from synovia that results in a secondary inflammatory joint response, pain, and destruction. The PVNS project, coordinated by Benoit Le Goff and Frédéric Blanchard (RMeS, T-Syno group) in collaboration with Fabienne Coury (INSERM UMR1033, Lyon) and Jérôme Avouac (INSERM U1016 Paris), has 3 main aims:
- To better understand PVNS pathophysiology using high throughput technologies in a cohort of PVNS patients and identify new therapeutic targets
- To set up an in vitro platform to better understand the crosstalk between cells and test new drugs and therapeutic targets on cells and tissues from PVNS patients
- To use and further develop original mouse models of PVNS to test drugs or new therapeutic targets, combined with a local delivery system, for treating PVNS patients

 

Funding of a new project by the Fondation de l'Avenir

The objective of this project, coordinated by Benoit Le Goff and Frédéric Blanchard (RMeS, T-Syno group), is to provide proof of principle that the local delivery of molecules interacting with the CSF1 pathway is feasible and effective in in vitro and in vivo models of Pigmented villonodular synovitis (PVNS). We will test a panel of therapeutic molecules on PVNS cells and explants in vitro and measure their impact on cell viability. The active molecules will then be studied in a mouse model of synovial tissue xenograft from patients with PVNS.

 

TARGET-OA

The REJOINT team of the INSERM U1229-RMeS laboratory is pleased to announce the recent funding of the “TARGET-OA: targeting the chondrocyte-derived CXCL12/endothelial cell CXCR4 axis in osteoarthritis” collaborative research project by the 2023 ANR Call. The ARGET-OA project is coordinated by Xavier Houard (INSERM UMRs 938 Centre de Recherche Saint Antoine, Paris) in collaboration with Marie-Hélène Lafage-Proust (INSERM U1059 SAINBIOSE, St Etienne) and Claire Vinatier (INSERM U1229-RMeS, AGE-OA group). In the TARGET-OA project, we propose that the CXCL12 / CXCR4 axis has a crucial role in the dialogue between hypertrophic chondrocytes and endothelial cells in OA. Our objectives are to define the role of this axis in pathological communication between chondrocytes and endothelial cells and to demonstrate that its targeting has a clinical interest in the treatment of OA.

 

ANR DISPHPE

The REJOINT team of the INSERM U1229-RMeS laboratory is pleased to announce the recent funding of the DISPHPE collaborative research project by the 2022 ANR Call on Translational Research in Health. In the DISPHPE project: “Comprehensive study of DISP1 gene variants to reach genotype-phenotype relationships of congenital anterior midline defects” coordinated by Valérie Dupé (IGDR, Rennes), Anne Camus (BIODIV Group, INSERM U1229, RMeS) will develop human induced pluripotent stem cells-based experimental models to investigate key molecular and functional aspects of developmental disorders arising during embryogenesis and related to the signaling role of the notochord.

 

L’exploration du rôle de la senescence cellulaire dans la maladie discale soutenue par la SFR

Dans le cadre de sa subvention aux projets individuels de recherche, la Société Française de Rhumatologie (SFR) a attribué une bourse [de 20000€] au projet « MoSCITO » porté par Romain GUIHO (La MOdulation de la Sénescence Cellulaire comme Innovation Thérapeutique dans la discOpathie dégénérative). En plus de faire progresser considérablement la caractérisation des cellules sénescentes dans le disque intervertébral, le projet MoSCITO a l'ambition de valider une nouvelle approche thérapeutique, ouvrant la voie à des progrès concrets et considérables dans la gestion clinique de la maladie discale.

 

A new collaborative project funded by the SFR: Characterization and new therapeutic options for pigmented villonodular synovitis (PVNS). It will be coordinated by Benoit Le Goff and Frédéric Blanchard in collaboration with Fabienne Coury (INSERM UMR1033, Lyon) and Jérôme Avouac (INSERM U1016 Paris). This project aims to 
- set up a multicentric biocollection of patients with PVNS; 
- explore the mechanisms leading to the development of synovitis (inflammation, genetic mutations, vascular compartment) using high-throughput technologies
- evaluate in vitro the biological activity of several drugs, in particular those targeting the CSF1 pathway, on tissues /cells from PVNS patients.

 

Bourse novartis DREAMER

Dr Christelle DARRIEUTORT-LAFFITE
Sujet de recherche : Etude de la cicatrisation d’un défect tendineux du supra-épineux chez la souris : analyse transcriptomique des populations cellulaires impliquées  

Description du projet :
Résumé : Bien que les tendinopathies représentent une problématique médicale fréquente, les options thérapeutiques restent peu nombreuses. Le tendon ayant une faible vascularisation et une faible cellularité, ses capacités naturelles de régénération/réparation sont faibles. Ce contexte, associé à nos connaissances limitées de la biologie des cellules du tendon et de la régulation de la ténogenèse, font du traitement des tendinopathies un réel challenge médical et scientifique. Des données récentes issues du Single-cell RNA-Sequencing démontrent la présence de populations de ténocytes hétérogènes au sein du tendon sain. Aucune donnée n’est disponible sur les changements au sein de ces populations cellulaires après une lésion tendineuse.
Objectifs : Etudier par Single-Cell RNA-Sequencing les populations cellulaires présentes au sein du tendon lors des différentes phases de la cicatrisation après une lésion partielle induite chirurgicalement au niveau du supra-épineux. Les échantillons seront recueillis à différents temps : en phase inflammatoire (J7), à la phase de prolifération (J21) et lors de la phase de remodelage (J42). Les échantillons seront également étudiés en histologie et immunohistochimie aux différents temps expérimentaux.


 

ANR NEMESIS

Low back pain (LBP) has been associated with intervertebral disc (IVD) degeneration. The recent identification of the microRNA (miR) role in IVD biology and degeneration allows considering miRs as new targets, but also as new potential therapeutic agents. The development of in vivo delivery systems, particularly miR-loaded nanocarriers, has thus been an area of active research. As a whole, the objectives of the NEMESIS project are (i) to set-up the formulation and characterization of miR-loaded nanocarriers, (ii) to implement potency assays and assess the interactions of miR-loaded nanocarriers with target cells in vitro and in an ex vivo whole IVD culture system and (iii) to establish the proof of concept of miR-loaded nanocarriers as a new therapeutic option in the management of DDD in an ovine preclinical model and in canine clinical trials. The NEMESIS project is based on an inter- and multi-disciplinary consortium composed of J. Clouet (scientific leader, RMeS lab), M. Fusellier (scientific co-leader, RMeS lab and ONIRIS) and Elise Lepeltier (scientific partner, MINT lab, Angers).
 

ATIP-Avenir SAMBA

Mandibular atrophy induced by the lack of a proper dentition is a major medical and socio-economic burden worldwide: the remaining bone volume is not sufficient to place dental implants to restore physiological functions. Although bone augmentation procedures exist, they are often heavy and complex, costly, and not deprived of risks (e.g., autologous bone graft). The ATIP-Avenir SAMBA program (INSERM/CNRS) will allow for the creation of a new group in RMeS Lab to tackle this issue, by developing among others 3D-printed patient specific biomimetic scaffolds for bone regeneration.

 

MiRbone By SFR

Age-related bone loss is a major medical and socio-economic problem worldwide. Many microRNAs are involved in bone homeostasis and may play a role in the development of osteoporosis. In the miRbone project funded by the SFR, Valérie Geoffroy and Frédéric Jehan (REGOS team) propose to dissect, using an "omic" approach, the mode of regulation of bone metabolism by one of these microRNAs, miR-199a2, whose significant effect in bone mass accrual has been demonstrated, with the aim of identifying new therapeutic targets to improve the management of bone loss in elderly patients.

 

ANR-DYNAM-OA

Osteoarthritis (OA) has no cure to date. To identify new therapeutic targets and screen drugs, researchers need in vitro OA joint models that are biologically relevant and reproducible. Bioprinting-assisted OA modeling is a promising avenue of research, yet bioprinting tools are limited. With the DYNAM-OA project, Vianney Delplace (BIOMAX group) propose to develop a new ultra-modular bioprinting toolbox, including a universal bioink platform and a strategy to produce gradient constructs, and apply these tools for the design of the first generation of bioprinted OA joint models.

 

ANR-COBIOSTEM

Traumatic brain injuries (TBI) are a critical public health and socio-economic problem throughout the world, with limited treatment options available. Cell transplantation offers a viable treatment strategy for patients with TBI, but transplanted neurons alone often rapidly die and fail to integrate brain tissue, leading to limited recovery. In the COBIOSTEM project, led by Afsaneh Gaillard (INSERM U1084 - LNEC), Vianney Delplace (BIOMAX group) will design a new generation of injectable hydrogels to improve the survival rate of transplanted cortical neurons, and enhance the long-term efficacy of cell transplantation to the brain.
 

International Research Project (IRP) Inserm (2022) GLYCODISC

The goal of the GLYCODISC projet is to consolidate a cooperating relationship between France (PI: Catherine LE VISAGE, Inserm) and Hong Kong (PI: Barbara CHAN, The University of Hong Kong (HKU)), in the field of regenerative medicine for intervertebral disc disease and low back pain.
The funding (75 000 euros, duration 5 years) aims to primarily contribute to mobility and organization of meetings. The ultimate outcome of the program is to lay the foundation for a large-scale international collaborative project with scientists from both countries.
 

ANR SmartIEs (2022)

The REJOINT team of the INSERM U1229-RMeS laboratory is pleased to announce the recent funding of the SmartIEs proposal as an ANR collaborative research project.
SmartIEs will be coordinated by Sylvia COLLIEC-JOUAULT (IFREMER) and will be carried out in collaboration with Stéphane CUENOT (Institut des Matériaux) and Catherine Le Visage (INSERM U1229, RMeS). The SmartIEs project will explore a cell-free strategy through conception of a smart hydrogel scaffold highly efficient to recruit regenerative progenitor cells and to stimulate their differentiation into appropriate cell lineages able to regenerate both cartilage and subchondral bone.

Comprehensive Characterization of Tissue Mineralization in an Ex Vivo Model

Constance Lesage, Pierre Guihard, Claire De Fourmestraux, Olivier Gauthier, Pierre Weiss, Jérome Guicheux, Aleksandra Mieczkowska, Joelle Véziers, Baptiste Charbonnier, Marie-Astrid Boutet, Guillaume Mabilleau

J Vis Exp

Abstract and More



Unveiling the macrophage dynamics in osteoarthritic joints: From inflammation to therapeutic strategies
Nicolas Gaigeard, Anaïs Cardon, Benoit Le Goff, Jérôme Guicheux, Marie-Astrid Boutet

Drug Discov Today

Abstract and more






Boronate Ester Hydrogels for Biomedical Applications: Challenges and Opportunities

Léa Terriac, Jean-Jacques Helesbeux, Yves Maugars, Jérôme Guicheux, Mark W. Tibbitt, and Vianney Delplace

https://pubs.acs.org/doi/10.1021/acs.chemmater.4c00507

Abstract and more




Gut hormones and bone homeostasis: potential therapeutic implications

Béatrice Bouvard, Guillaume Mabilleau


https://www.nature.com/articles/s41574-024-01000-z

Abstract and more



Gene therapies for osteoarthritis: progress and prospects

Anais Defois, Nina Bon, Mathieu Mével, David Deniaud, Yves Maugars, Jérôme Guicheux, Oumeya Adjali, Claire Vinatier


https://doi.org/10.1016/j.jcjp.2024.100186

Abstract and more

Women's contribution to stem cell research for osteoarthritis: an opinion paper

Émilie Velot, Elizabeth R Balmayor, Lélia Bertoni, Susan Chubinskaya, Flavia Cicuttini , Laura de Girolamo, Magali Demoor, Brunella Grigolo, Elena Jones, Elizaveta Kon, Gina Lisignoli, Mary Murphy, Danièle Noël, Claire Vinatier, Gerjo J V M van Osch, Magali Cucchiarini

10.3389/fcell.2023.1209047

Abstract and more



Automatic grading of intervertebral disc degeneration in lumbar dog spines

Frank Niemeyer, Fabio Galbusera, Martijn Beukers, René Jonas, Youping Tao, Marion Fusellier, Marianna A. Tryfonidou,
Cornelia Neidlinger-Wilke, Annette Kienle, Hans-Joachim Wilke

http://dx.doi.org/10.1002/jsp2.1326

Abstract and more


Optimizing the physical properties of collagen/hyaluronan hydrogels by inhibition of polyionic complexes formation at pH close to the collagen isoelectric point

Stéphanie De Oliveira, Gregor Miklosic, Joëlle Veziers, Sébastien Grastilleur, Thibaud Coradin, Catherine Le Visage, Jérôme Guicheux, Matteo D'Este, Christophe Hélary

PMID: 37971365 DOI: 10.1039/d3sm01330h

Abstract and more




Development of a DNA damage-induced senescence model in osteoarthritic chondrocytes

Mélina Georget, Anaïs Defois, Romain Guiho, Nina Bon, Sophie Allain, Cécile Boyer, Boris Halgand, Denis Waast, Gaël Grimandi, Alban Fouasson-Chailloux, Jérôme Guicheux, Claire Vinatier

 PMID: 33227437 PMCID: PMC7925350 DOI: 10.1016/j.joca.2020.11.004

Abstract and more



Recommendations for intervertebral disc notochordal cell investigation: From isolation to characterization

Williams R.J., Laagland L.T., Bach F.C., Ward L., Chan W., Tam V., Medzikovic A., Basatvat S., Paillat L., Vedrenne N.,
Snuggs J.W., Poramba-Liyanage D.W., Hoyland J.A., Chan D., Camus A., Richardson S.M., Tryfonidou M.A., Le Maitre C.L. (2023). Recommendations for intervertebral disc notochordal cell investigation: From isolation to characterization. JOR Spine 1272:1-22. DOI: 10.1002/jsp2.1272.


Abstract and more





Osteoarthritic chondrocytes undergo a glycolysis-related metabolic switch upon exposure to IL-1b or TNF

Anais Defois , Nina Bon, Alexandre Charpentier , Melina Georget, Nicolas Gaigeard, Frederic Blanchard, Antoine Hamel, Denis Waast, Jean Armengaud, Ophelie Renoult, Claire Pecqueur, Yves Maugars, Marie-Astrid Boutet , Jerome Guicheux, Claire Vinatier

Cell Communication and signaling

Abstract and more




 

PPARβ/δ-Interfering Peptide Enhanced Mesenchymal Stromal Cell Immunoregulatory Properties

Gautier Tejedor,Prisca Boisguerin, Éric Vivès, Christian Jorgensen, Jérôme Guicheux, Claire Vinatier, Claire Gondeau, and Farida Djouad

Stem Cells International

Abstract and more

Transition from continuous to microglobular shaped peptide assemblies through a Liesegang-like enzyme-assisted mechanism.

Runser J-Y, Fneich F, Senger B, Weiss P, Jierry L,  Schaaf P

Journal of Colloid and Interface Science, 2022 Nov 22


Abstract and more



IL-34 deficiency impairs FOXP3+ Treg function in a model of autoimmune colitis and decreases immune tolerance homeostasis.

Freuchet A, Salama A, Bézie S, Tesson L, Rémy S, Humeau R, Règue H, Sérazin C, Flippe L, Peterson P, Vimond N, Usal C, Ménoret S, Heslan JM, Duteille F, Blanchard F, Giral M, Colonna M, Anegon I, Guillonneau C.
Clin Transl Med. 2022 Aug;12(8):e988. doi: 10.1002/ctm2.988.
Abstract and more






 

 

 

La soutenance de thèse de Claire de Fourmestraux aura lieu le 12 novembre prochain à 14h à Oniris.
Le titre de la thèse est : Modélisation lésionnelle et utilisation des biomatériaux et de la médecine régénérative pour traiter les atteintes de l’os sous-chondral et du cartilage articulaire chez le mouton


La soutenance de thèse d'Emmaëlle Carrot aura lieu le lundi 9 décembre 2024 à 14h dans l'Amphithéâtre Alexis Ricordeau.
Le titre de la thèse est : Conception d'un modèle in vitro par bioimpression 3D reproduisant l'architecture et l'organisation cellulaire d'un disque intervertébral ovin. (En. Development of an in vitro 3D bioprinting model reproducing the architecture and cellular organization of an ovine intervertebral discs). Mots clé: Meltelectrowriting, Bioimpression par extrusion, Bio-encre, Modèle 3D (En. Keywords:Meltelectrowriting, Extrusion bioprinting, bio-ink, 3D model).

Résumé
Le disque intervertébral (DIV) est une structure fibrocartilagineuse composée d'un anneau fibreux externe, l'Annulus Fibrosus (AF), entourant un noyau hydraté, le Nucleus Pulposus (NP). La dégénérescence du DIV est une cause importante de lombalgie pour la-quelle des stratégies thérapeutiques sont en cours de développement. Leur évaluation re-pose sur des systèmes de culture cellulaire qui ne reproduisent pas la structure complexe du DIV. Ainsi, la plupart des études précliniques échouent faute de pertinence des modèles in vitro. Le développement rapide de nouveaux traitements et le besoin de réduire l'utilisation d'animaux incitent les chercheurs à explorer de nouveaux modèles in vitro plus complexes et représentatifs. La biofabrication par bioimpres-sion pourrait répondre à ce besoin. Dans ces travaux nous montrons deux straté-gies de biofabrication pour le développement de modèles in vitro 3D reproduisant la macro- et la microarchitecture du DIV ovin. Une pre-mière stratégie a démontré qu’il était possible de déposer des cellules discales ovines (AF et NP) à des emplacements spécifiques pour reproduire les différentes parties constituant le DIV. Une seconde stratégie a consisté à in-corporer des fibres électroécrites afin de gui-der les cellules de l’AF au sein de la construc-tion. Après avoir été déposées par bioimpres-sion, les cellules d’AF étaient capables d’adhérer sur les fibres et de modifier leur morphologie reproduisant la structure aniso-trope du DIV. Ensemble, ces résultats ouvrent la voie au développement de modèles in vitro de DIV cliniquement pertinents.

(Eng. The intervertebral disc (IVD) is a fibrocartilaginous structure composed of an outer fibrous ring of collagen, Annulus Fibrosus (AF), surrounding a soft gelatinous core, Nucle-us Pulposus (NP). IVD degeneration is a wide-spread cause of lower back pain, and therapeu-tic strategies are currently being developed. Their evaluation relies on cell culture systems, which do not reproduce the complex structure of the IVD. Most preclinical studies fail due to the irrelevance of these in vitro models. The rapid development of novel treatments and the aim of reducing the use of animals are prompting re-searchers to consider potential new in vitro models, more complex and representative than models currently used. Biofabrication by bi-oprinting could be the answer.In this work, we introduce two biofabrication strategies for the development of 3D in vitro models reproducing the macro- and microarchitecture of an ovine IVD. A first strategy demonstrated the feasiblity to deposit sheep AF and NP cells at specific locations to reproduce the different components of the IVD. A second strategy was to incorporate electro-written fibers to guide AF cells within the construct. After being deposited by bioprinting, the AF cells were able to adhere to the fibers and modify their morphology, mimicking the anisotropic structure of the IVD. Taken together, these results open the way for the development of clinically relevant in vitro IVD models.)


La soutenance de thèse de Julie Warin aura lieu le 16 décembre à 14h dans l'amphi Ricordeau
Sujet de thèse : Etude de la différenciation des cellules de notochorde et du développement