MiR-100-5p-abundant exosomes derived from infrapatellar fat pad MSCs protect articular cartilage and ameliorate gait abnormalities via inhibition of mTOR in osteoarthritis. (June 2019)

• Record Type: Journal Article
• Authors: Wu, Jiangyi; Kuang, Liang; Chen, Cheng; Yang, Junjun; Zeng, Wei-Nan; Li, Tao; Chen, Hao; Huang, Shu; Fu, Zhenlan; Li, Jiamiao; Liu, Renfeng; Ni, Zhenhong; Chen, Lin; Yang, Liu
• Is Part Of: Biomaterials. Volume 206(2019)
• Page Start: 87
• Page End: 100
• Publication Date: 2019-06
• Subjects: Exosomes -- Infrapatellar fat pad -- mTOR -- Autophagy -- Osteoarthritis; Biomedical materials -- Periodicals; Biocompatible Materials -- Periodicals; Biomatériaux -- Périodiques; 610.28
• DOI: 10.1016/j.biomaterials.2019.03.022
• Languages: English
• ISSNs: 0142-9612

Abstract

Abstract: Osteoarthritis (OA) is the most common disabling joint disease throughout the world and its therapeutic effect is still not satisfactory in clinic nowadays. Recent studies showed that the exosomes derived from several types of mesenchymal stem cells (MSCs) could maintain chondrocyte homeostasis and ameliorate the pathological severity of OA in animal models, indicating that MSCs-derived exosomes could be a novel promising strategy for treating OA. In this study, we investigated the role and underlying mechanisms of infrapatellar fat pad (IPFP) MSCs-derived exosomes (MSC IPFP -Exos) on OA in vitro and in vivo . Our data revealed that MSC IPFP could produce amounts of MSC IPFP -Exos, which exhibited the typical morphological features of exosomes. The MSC IPFP -Exos ameliorated the OA severity in vivo and inhibited cell apoptosis, enhanced matrix synthesis and reduced the expression of catabolic factor in vitro . Moreover, MSC IPFP -Exos could significantly enhance autophagy level in chondrocytes partially via mTOR inhibition. Exosomal RNA-seq showed that the level of miR-100-5p that could bind to the 3′-untranslated region (3′UTR) of mTOR was the highest among microRNAs. MSC IPFP -Exos decreased the luciferase activity of mTOR 3′UTR, while inhibition of miR-100-5p could reverse the MSC IPFP -Exos-decreased mTOR signaling pathway. Intra-articular injection of antagomir-miR-100-5p dramatically attenuated MSC IPFP -Exos-mediated protective effect on articular cartilage in vivo . In brief, MSC IPFP -derived exosomes protect articular cartilage from damage and ameliorate gait abnormality in OA mice by maintaining cartilage homeostasis, the mechanism of which may be related to miR100-5p-regulated inhibition of mTOR-autophagy pathway. As it is relatively feasible to obtain human IPFP from OA patients by arthroscopic operation in clinic, MSC IPFP -derived exosomes may be a potential therapy for OA in the future. Graphical abstract: Image 1