M Ruiz1, M Maumus1, G Fonteneau1, Y-M Pers2, R Ferreira2, L Dagneaux3, C Delfour4, X Houard5, F Berenbaum5, F Rannou6, C Jorgensen7, D Noël8. 1. IRMB, University Montpellier, INSERM, CHU Montpellier, Montpellier, France. 2. Hôpital Lapeyronie, Clinical Immunology and Osteoarticular Diseases Therapeutic Unit, Montpellier, France. 3. Hôpital Lapeyronie, Department of Orthopaedic Surgery, Montpellier, France. 4. CHU Montpellier, Cellular and Tissular Biopathology Department, Montpellier, France. 5. Sorbonne University, UPMC University Paris 06, INSERM, Centre de Recherche Saint-Antoine, Paris, France. 6. INSERM U1124, University Paris Descartes, APHP Hôpital Cochin, Paris, France. 7. IRMB, University Montpellier, INSERM, CHU Montpellier, Montpellier, France; Hôpital Lapeyronie, Clinical Immunology and Osteoarticular Diseases Therapeutic Unit, Montpellier, France. 8. IRMB, University Montpellier, INSERM, CHU Montpellier, Montpellier, France; Hôpital Lapeyronie, Clinical Immunology and Osteoarticular Diseases Therapeutic Unit, Montpellier, France. Electronic address: daniele.noel@inserm.fr.
Abstract
OBJECTIVE: Transforming growth factor-β (TGFβ) is a major regulator of cartilage homeostasis and its deregulation has been associated with osteoarthritis (OA). Deregulation of the TGFβ pathway in mesenchymal stem cells (MSCs) has been proposed to be at the onset of OA. Using a secretome analysis, we identified a member of the TGFβ family, TGFβ-induced protein (TGFβi or βIGH3), expressed in MSCs and we investigated its function and regulation during OA. DESIGN: Cartilage, bone, synovium, infrapatellar fat pad and bone marrow-MSCs were isolated from patients with OA or healthy subjects. Chondrogenesis of BM-MSCs was induced by TGFβ3 in micropellet culture. Expression of TGFβi was quantified by RT-qPCR, ELISA or immunohistochemistry. Role of TGFβi was investigated in gain and loss of function experiments in BM-MSCs and chondrocytes. RESULTS: TGFβi was up-regulated in early stages of chondrogenesis and its knock-down in BM-MSCs resulted in the down-regulation of mature and hypertrophic chondrocyte markers. It likely occurred through the modulation of adhesion molecules including integrin (ITG)β1, ITGβ5 and N-cadherin. We also showed that TGFβi was upregulated in vitro in a model of OA chondrocytes, and its silencing enhanced the hypertrophic marker type X collagen. In addition, TGFβi was up-regulated in bone and cartilage from OA patients while its expression was reduced in BM-MSCs. Similar findings were observed in a murine model of OA. CONCLUSIONS: Our results revealed a dual role of TGFβi during chondrogenesis and pointed its deregulation in OA joint tissues. Modulating TGFβi in BM-MSCs might be of interest in cartilage regenerative medicine.
OBJECTIVE: Transforming growth factor-β (TGFβ) is a major regulator of cartilage homeostasis and its deregulation has been associated with osteoarthritis (OA). Deregulation of the TGFβ pathway in mesenchymal stem cells (MSCs) has been proposed to be at the onset of OA. Using a secretome analysis, we identified a member of the TGFβ family, TGFβ-induced protein (TGFβi or βIGH3), expressed in MSCs and we investigated its function and regulation during OA. DESIGN:Cartilage, bone, synovium, infrapatellar fat pad and bone marrow-MSCs were isolated from patients with OA or healthy subjects. Chondrogenesis of BM-MSCs was induced by TGFβ3 in micropellet culture. Expression of TGFβi was quantified by RT-qPCR, ELISA or immunohistochemistry. Role of TGFβi was investigated in gain and loss of function experiments in BM-MSCs and chondrocytes. RESULTS: TGFβi was up-regulated in early stages of chondrogenesis and its knock-down in BM-MSCs resulted in the down-regulation of mature and hypertrophic chondrocyte markers. It likely occurred through the modulation of adhesion molecules including integrin (ITG)β1, ITGβ5 and N-cadherin. We also showed that TGFβi was upregulated in vitro in a model of OA chondrocytes, and its silencing enhanced the hypertrophic marker type X collagen. In addition, TGFβi was up-regulated in bone and cartilage from OA patients while its expression was reduced in BM-MSCs. Similar findings were observed in a murine model of OA. CONCLUSIONS: Our results revealed a dual role of TGFβi during chondrogenesis and pointed its deregulation in OA joint tissues. Modulating TGFβi in BM-MSCs might be of interest in cartilage regenerative medicine.
Authors: Sydney Hodgeson; Sarah O'Brien; Jennifer Simkin; Elena Plakotaris; Christina McCarthy; Vinod Dasa; Luis Marrero Journal: J Orthop Res Date: 2021-05-11 Impact factor: 3.494