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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-Exos) on OA in vitro and in vivo. Our data revealed that MSC could produce amounts of MSC-Exos, which exhibited the typical morphological features of exosomes. The MSC-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-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-Exos decreased the luciferase activity of mTOR 3'UTR, while inhibition of miR-100-5p could reverse the MSC-Exos-decreased mTOR signaling pathway. Intra-articular injection of antagomir-miR-100-5p dramatically attenuated MSC-Exos-mediated protective effect on articular cartilage in vivo. In brief, MSC-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-derived exosomes may be a potential therapy for OA in the future.
This article was published in the following journal.
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The joint that is formed by the inferior articular and malleolar articular surfaces of the TIBIA; the malleolar articular surface of the FIBULA; and the medial malleolar, lateral malleolar, and superior surfaces of the TALUS.
Obtaining material for pathological examination and analysis, from bodily fluids. Material retrieved includes CELL-FREE NUCLEIC ACIDS; CELL-DERIVED MICROPARTICLES; EXOSOMES; CIRCULATING NEOPLASM CELLS; and other circulating cells and CELLULAR STRUCTURES.
A water-soluble thiol derived from hydrogen sulfide and ethanol. It is used as a reducing agent for disulfide bonds and to protect sulfhydryl groups from oxidation.
Fractures of the articular surface of a bone.
Large HYALURONAN-containing proteoglycans found in articular cartilage (CARTILAGE, ARTICULAR). They form into aggregates that provide tissues with the capacity to resist high compressive and tensile forces.
Arthritis is by definition the inflammation of one or more joints, characterized by swelling, pain, warmth, redness and diminished range of joint movement (Oxford Medical Dictionary). There are many different types; Noninflammatory; Osteoarthritis, N...