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Li J, Gui T, Yao L, Guo H, Lin YL, Lu J, Duffy M, Zgonis M, Mauck R, Dyment N, Zhang Y, Scanzello C, Seale P, Qin L. Synovium and infrapatellar fat pad share common mesenchymal progenitors and undergo coordinated changes in osteoarthritis. J Bone Miner Res 2024; 39:161-176. [PMID: 38477740 DOI: 10.1093/jbmr/zjad009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/06/2023] [Revised: 11/09/2023] [Accepted: 12/01/2023] [Indexed: 03/14/2024]
Abstract
Osteoarthritis (OA) affects multiple tissues in the knee joint, including the synovium and intra-articular adipose tissue (IAAT) that are attached to each other. However, whether these two tissues share the same progenitor cells and hence function as a single unit in joint homeostasis and diseases is largely unknown. Single-cell transcriptomic profiling of synovium and infrapatellar fat pad (IFP), the largest IAAT, from control and OA mice revealed five mesenchymal clusters and predicted mesenchymal progenitor cells (MPCs) as the common progenitors for other cells: synovial lining fibroblasts (SLFs), myofibroblasts (MFs), and preadipocytes 1 and 2. Histologic examination of joints in reporter mice having Dpp4-CreER and Prg4-CreER that label MPCs and SLFs, respectively, demonstrated that Dpp4+ MPCs reside in the synovial sublining layer and give rise to Prg4+ SLFs and Perilipin+ adipocytes during growth and OA progression. After OA injury, both MPCs and SLFs gave rise to MFs, which remained in the thickened synovium at later stages of OA. In culture, Dpp4+ MPCs possessed mesenchymal progenitor properties, such as proliferation and multilineage differentiation. In contrast, Prg4+ SLFs did not contribute to adipocytes in IFP and Prg4+ cells barely grew in vitro. Taken together, we demonstrate that the synovium and joint fat pad are one integrated functional tissue sharing common mesenchymal progenitors and undergoing coordinated changes during OA progression.
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Affiliation(s)
- Jun Li
- Department of Orthopaedic Surgery, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, United States
| | - Tao Gui
- Department of Orthopaedic Surgery, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, United States
- Department of Bone and Joint Surgery, Institute of Orthopedic Diseases, The First Affiliated Hospital, Jinan University, Guangzhou, Guangdong 510630, China
| | - Lutian Yao
- Department of Orthopaedic Surgery, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, United States
- Department of Orthopaedics, The First Hospital of China Medical University, Shenyang, Liaoning Province 110112, China
| | - Hanli Guo
- Department of Orthopaedic Surgery, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, United States
| | - Yu-Lieh Lin
- Department of Orthopaedic Surgery, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, United States
| | - Jiawei Lu
- Department of Orthopaedic Surgery, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, United States
| | - Michael Duffy
- Department of Orthopaedic Surgery, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, United States
| | - Miltiadis Zgonis
- Department of Orthopaedic Surgery, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, United States
| | - Robert Mauck
- Department of Orthopaedic Surgery, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, United States
- Translational Musculoskeletal Research Center, Corp. Michael J Crescenz, VA Medical Center, Philadelphia PA 19104, United States
| | - Nathaniel Dyment
- Department of Orthopaedic Surgery, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, United States
| | - Yejia Zhang
- Department of Orthopaedic Surgery, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, United States
- Translational Musculoskeletal Research Center, Corp. Michael J Crescenz, VA Medical Center, Philadelphia PA 19104, United States
- Department of Physical Medicine & Rehabilitation, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, United States
| | - Carla Scanzello
- Translational Musculoskeletal Research Center, Corp. Michael J Crescenz, VA Medical Center, Philadelphia PA 19104, United States
- Division of Rheumatology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, United States
| | - Patrick Seale
- Department of Cell and Developmental Biology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, United States
| | - Ling Qin
- Department of Orthopaedic Surgery, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, United States
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Yılmaz BK, Konya MN, İnce S, Demirel HH, Çetin Y, Güngör A. Investigation of the efficacy of epidermal growth factor, boric acid and their combination in cartilage injury in rats: An experimental study. Jt Dis Relat Surg 2024; 35:156-168. [PMID: 38108177 PMCID: PMC10746896 DOI: 10.52312/jdrs.2023.1074] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2023] [Accepted: 09/15/2023] [Indexed: 12/19/2023] Open
Abstract
OBJECTIVES In this study, we aimed to determine the bioefficacy of epidermal growth factor (EGF), boric acid (BA), and their combination on cartilage injury in rats. MATERIALS AND METHODS In in vitro setting, the cytotoxic effects of BA, EGF, and their combinations using mouse fibroblast cell (L929), human bone osteosarcoma cell (Saos-2), and human adipose derived mesenchymal stem cells (hAD-MSCs) were determined by applying MTT [3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide] test. In in vivo setting, 72 rats were randomly divided into four groups. A standard chondral defect was created and microfracture was performed in all groups. Group A was determined as the control group. In addition to the standard procedure, Group B received 100 ng/mL of EGF, Group C received a combination of 100 ng/mL of EGF and 10 µg/mL of BA combination, and Group D 20 µg/mL of BA. RESULTS The cytotoxic effect of the combinations of EGF dilutions (1, 5, 10, 25, 50, 100, 200 ng/mL) with BA (100, 300, 500 µg/mL) was observed only in the 72-h application period and in Saos-2. The cytotoxic effect of BA was reduced when combined with EGF. There was no significant difference in the histopathological scores among the groups (p=0.13). CONCLUSION Our study showed that EGF and low-dose BA application had a positive effect on cartilage healing in rats. Significant decreases in recovery scores were observed in the other groups. The combination of EGF and BA promoted osteoblast growth. Detection of lytic lesions in the group treated with 20 µg/mL of BA indicates that BA may have a cytotoxic effect.
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Affiliation(s)
- Bilge Kağan Yılmaz
- Afyonkarahisar Devlet Hastanesi Ortopedi ve Travmatoloji Kliniği, 03030 Afyonkarahisar, Türkiye.
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Santi MD, Zhang M, Liu N, Viet CT, Xie T, Jensen DD, Amit M, Pan H, Ye Y. Repurposing EGFR Inhibitors for Oral Cancer Pain and Opioid Tolerance. Pharmaceuticals (Basel) 2023; 16:1558. [PMID: 38004424 PMCID: PMC10674507 DOI: 10.3390/ph16111558] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2023] [Revised: 10/24/2023] [Accepted: 10/27/2023] [Indexed: 11/26/2023] Open
Abstract
Oral cancer pain remains a significant public health concern. Despite the development of improved treatments, pain continues to be a debilitating clinical feature of the disease, leading to reduced oral mobility and diminished quality of life. Opioids are the gold standard treatment for moderate-to-severe oral cancer pain; however, chronic opioid administration leads to hyperalgesia, tolerance, and dependence. The aim of this review is to present accumulating evidence that epidermal growth factor receptor (EGFR) signaling, often dysregulated in cancer, is also an emerging signaling pathway critically involved in pain and opioid tolerance. We presented preclinical and clinical data to demonstrate how repurposing EGFR inhibitors typically used for cancer treatment could be an effective pharmacological strategy to treat oral cancer pain and to prevent or delay the development of opioid tolerance. We also propose that EGFR interaction with the µ-opioid receptor and glutamate N-methyl-D-aspartate receptor could be two novel downstream mechanisms contributing to pain and morphine tolerance. Most data presented here support that repurposing EGFR inhibitors as non-opioid analgesics in oral cancer pain is promising and warrants further research.
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Affiliation(s)
- Maria Daniela Santi
- Translational Research Center, College of Dentistry, New York University, New York, NY 10010, USA; (M.D.S.); (M.Z.); (N.L.); (D.D.J.)
- Pain Research Center, Department of Molecular Pathobiology, College of Dentistry, New York University, New York, NY 10010, USA
| | - Morgan Zhang
- Translational Research Center, College of Dentistry, New York University, New York, NY 10010, USA; (M.D.S.); (M.Z.); (N.L.); (D.D.J.)
- Pain Research Center, Department of Molecular Pathobiology, College of Dentistry, New York University, New York, NY 10010, USA
| | - Naijiang Liu
- Translational Research Center, College of Dentistry, New York University, New York, NY 10010, USA; (M.D.S.); (M.Z.); (N.L.); (D.D.J.)
- Pain Research Center, Department of Molecular Pathobiology, College of Dentistry, New York University, New York, NY 10010, USA
| | - Chi T. Viet
- Department of Oral and Maxillofacial Surgery, School of Dentistry, Loma Linda University, Loma Linda, CA 92350, USA;
| | - Tongxin Xie
- Department of Head and Neck Surgery, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA; (T.X.); (M.A.)
| | - Dane D. Jensen
- Translational Research Center, College of Dentistry, New York University, New York, NY 10010, USA; (M.D.S.); (M.Z.); (N.L.); (D.D.J.)
- Pain Research Center, Department of Molecular Pathobiology, College of Dentistry, New York University, New York, NY 10010, USA
| | - Moran Amit
- Department of Head and Neck Surgery, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA; (T.X.); (M.A.)
| | - Huilin Pan
- Center for Neuroscience and Pain Research, Department of Anesthesiology and Perioperative Medicine, University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA;
| | - Yi Ye
- Translational Research Center, College of Dentistry, New York University, New York, NY 10010, USA; (M.D.S.); (M.Z.); (N.L.); (D.D.J.)
- Pain Research Center, Department of Molecular Pathobiology, College of Dentistry, New York University, New York, NY 10010, USA
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Wu CC. Patellar malalignment: A common disorder associated with knee pain. Biomed J 2023; 46:100658. [PMID: 37678711 PMCID: PMC10550501 DOI: 10.1016/j.bj.2023.100658] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2023] [Revised: 08/23/2023] [Accepted: 08/30/2023] [Indexed: 09/09/2023] Open
Abstract
Pain-associated knee joint disorders are common in daily life. Practically, knee pain should be divided into the origin from the isolated tibiofemoral (TF), isolated patellofemoral (PF) joint, or a combination thereof. The TF joint controls the actions of level walking, while the PF joint controls knee flexion-extension. Owing to its sufficient inherent stability, non-traumatic disorders of the isolated TF joint in young individuals are uncommon. In contrast, because of its insufficient inherent stability, non-traumatic disorders of the isolated PF joint are common in young individuals. Patellar malalignment (PM) associated with knee pain is common in all age groups, and the most common predisposing factor is imbalanced peripatellar soft-tissue tension. The outward forces acting on the patella are caused by pulling from the quadriceps femoris during knee flexion to extension (manifested by the quadriceps angle [Q-angle]), and sliding backward of the iliotibial band (ITB) during knee extension to flexion. Once the muscle power of the vastus medialis (especially the vastus medialis obliquus [VMO]) decreases, which lowers the counteracting effect against outward forces, the patella displaces or rotates laterally. The reduced contact surface between the patella and the femoral condyle significantly increases the compressive pressure and injures the articular cartilage. Subsequently, progressive PF degeneration occurs. Although other factors may also cause PM, they are relatively uncommon. In principle, nonsurgical treatment of PM should be considered first, while surgical treatment should follow established indications. Some nonsurgical techniques are currently widely used that feature high satisfaction rates. Surgical techniques are continuously being developed, and their success rates have gradually improved. This study aimed to review the current literature for relevant studies and report related publications of the author's institution to emphasize the universality and importance of PM management. Conceptually, simply focusing on problems of the TF joint cannot treat all knee disorders.
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Affiliation(s)
- Chi-Chuan Wu
- Department of Orthopedic Surgery, Chang Gung Memorial Hospital, Chang Gung University, Taoyuan, Taiwan.
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Sun H, Peng G, Chen K, Xiong Z, Zhuang Y, Liu M, Ning X, Yang H, Deng J. Identification of EGFR as an essential regulator in chondrocytes ferroptosis of osteoarthritis using bioinformatics, in vivo, and in vitro study. Heliyon 2023; 9:e19975. [PMID: 37810027 PMCID: PMC10559678 DOI: 10.1016/j.heliyon.2023.e19975] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2023] [Revised: 09/05/2023] [Accepted: 09/07/2023] [Indexed: 10/10/2023] Open
Abstract
Objective The mechanisms of chondrocytes ferroptosis in osteoarthritis (OA) have not yet been fully elucidated. This study aimed to identify key ferroptosis related genes (FRGs) involved in chondrocytes ferroptosis. Methods LASSO, SVM-RFE, and receiver operating characteristic curve (ROC) were performed to screen key differentially expressed FRGs (DEFRGs). Functional analyses were conducted using GO, and KEGG analyses. Unsupervised clustering analysis was used to identify ferroptosis related patterns. The CeRNA network was constructed to predict the upstream miRNAs and lncRNAs. Finally, we validated the role of EGFR in chondrocytes ferroptosis using in vivo and in vitro experiments. Results A total of 42 DEFRGs were identified between OA and normal cartilages. GO and KEGG analyses indicated that these DEFRGs were significantly engaged in ferroptosis related biological processes and pathways, such as cellular response to oxidative stress, positive regulation of programmed cell death, MAPK and PI3K-Akt signaling pathways. Moreover, four key DEFRGs, including ACSF2, AURKA, EGFR, and KLHL24, were considered as potential biomarkers of OA. Moreover, two distinct ferroptosis related patterns were determined, and a total of 882 differentially expressed genes were identified which might participate in extracellular matrix degradation and inflammatory response. In addition, the CeRNA network showed that EGFR could be competitively regulated by 3 lncRNAs and 4 miRNAs. Significantly, the expression of EGFR was downregulated in human OA cartilages, OA mouse model, and erastin induced chondrocytes. EGFR inhibition could induce the occurrence of chondrocytes ferroptosis and ECM degradation which could be reversed by the addition of Ferrostatin-1. Conclusion Our study has identified ACSF2, AURKA, EGFR, and KLHL24 as ferroptosis-related biomarkers in OA. Furthermore, we have conducted a preliminary investigation into the role of EGFR in regulating chondrocytes ferroptosis. These findings offer novel insights into the molecular mechanisms underlying OA.
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Affiliation(s)
- Hong Sun
- Department of Orthopaedics, The Affiliated Hospital of Guizhou Medical University, Guiyang, 550004, China
- Department of Emergence Surgery, The Affiliated Hospital of Guizhou Medical University, Guiyang, 550004, China
- School of Clinical Medicine, Guizhou Medical University, Guiyang, 550004, China
| | - Guoxuan Peng
- Department of Orthopaedics, The Affiliated Hospital of Guizhou Medical University, Guiyang, 550004, China
| | - Kunhao Chen
- Department of Orthopaedics, The Affiliated Hospital of Guizhou Medical University, Guiyang, 550004, China
- School of Clinical Medicine, Guizhou Medical University, Guiyang, 550004, China
| | - Zhilin Xiong
- Department of Orthopaedics, The Affiliated Hospital of Guizhou Medical University, Guiyang, 550004, China
- School of Clinical Medicine, Guizhou Medical University, Guiyang, 550004, China
| | - Yong Zhuang
- Department of Orthopaedics, The Affiliated Hospital of Guizhou Medical University, Guiyang, 550004, China
| | - Miao Liu
- Department of Orthopaedics, The Affiliated Hospital of Guizhou Medical University, Guiyang, 550004, China
| | - Xu Ning
- Department of Orthopaedics, The Affiliated Hospital of Guizhou Medical University, Guiyang, 550004, China
| | - Hua Yang
- Department of Orthopaedics, The Affiliated Hospital of Guizhou Medical University, Guiyang, 550004, China
| | - Jin Deng
- Department of Emergence Surgery, The Affiliated Hospital of Guizhou Medical University, Guiyang, 550004, China
- School of Clinical Medicine, Guizhou Medical University, Guiyang, 550004, China
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Rocchetti MT, Bizzoca D, Moretti L, Ragni E, Moretti FL, Vicenti G, Solarino G, Rizzello A, Petruzzella V, Palese LL, Scacco S, Banfi G, Moretti B, Gnoni A. A Gel-Based Proteomic Analysis Reveals Synovial α-Enolase and Fibrinogen β-Chain Dysregulation in Knee Osteoarthritis: A Controlled Trial. J Pers Med 2023; 13:916. [PMID: 37373906 PMCID: PMC10305339 DOI: 10.3390/jpm13060916] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2023] [Revised: 05/28/2023] [Accepted: 05/28/2023] [Indexed: 06/29/2023] Open
Abstract
BACKGROUND The identification of synovial fluid (SF) biomarkers that could anticipate the diagnosis of osteoarthritis (OA) is gaining increasing importance in orthopaedic clinical practice. This controlled trial aims to assess the differences between the SF proteome of patients affected by severe OA undergoing Total Knee Replacement (TKR) compared to control subjects (i.e., subjects younger than 35, undergoing knee arthroscopy for acute meniscus injury). METHODS The synovial samples were collected from patients with Kellgren Lawrence grade 3 and 4 knee osteoarthritis undergoing THR (study group) and young patients with meniscal tears and no OA signs undergoing arthroscopic surgery (control group). The samples were processed and analyzed following the protocol defined in our previous study. All of the patients underwent clinical evaluation using the International Knee Documentation Committee (IKDC) subjective knee evaluation (main outcome), Knee Society Clinical Rating System (KSS), Knee injury and Osteoarthritis Outcome Score (KOOS), and Visual Analogue Scale (VAS) for pain. The drugs' assumptions and comorbidities were recorded. All patients underwent preoperative serial blood tests, including complete blood count and C-Reactive Protein (CRP). RESULTS The synovial samples' analysis showed a significantly different fibrinogen beta chain (FBG) and alpha-enolase 1 (ENO1) concentration in OA compared to the control samples. A significant correlation between clinical scores, FBG, and ENO1 concentration was observed in osteoarthritic patients. CONCLUSIONS Synovial fluid FBG and ENO1 concentrations are significantly different in patients affected by knee OA compared with non-OA subjects.
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Affiliation(s)
- Maria Teresa Rocchetti
- Department of Clinical and Experimental Medicine, University of Foggia, Via Pinto 1, 71122 Foggia, Italy
| | - Davide Bizzoca
- Orthopaedics Unit-UOSD Vertebral Surgery, DAI Neuroscience, Sense Organs and Locomotor System, AOU Consorziale Policlinico, 70124 Bari, Italy
- PhD Course in Public Health, Clinical Medicine and Oncology, DiMePre-J, University of Bari "Aldo Moro", Piazza Giulio Cesare 11, 70124 Bari, Italy
| | - Lorenzo Moretti
- Orthopaedics Unit-UOSD Vertebral Surgery, DAI Neuroscience, Sense Organs and Locomotor System, AOU Consorziale Policlinico, 70124 Bari, Italy
| | - Enrico Ragni
- IRCCS Istituto Ortopedico Galeazzi, Laboratorio di Biotecnologie Applicate all'Ortopedia, Via R. Galeazzi 4, 20161 Milano, Italy
| | - Francesco Luca Moretti
- IRCCS Istituto Ortopedico Galeazzi, Laboratorio di Biotecnologie Applicate all'Ortopedia, Via R. Galeazzi 4, 20161 Milano, Italy
- National Centre for Chemicals, Cosmetic Products and Consumer Protection, National Institute of Health, 00161 Rome, Italy
| | - Giovanni Vicenti
- Orthopaedics Unit-UOSD Vertebral Surgery, DAI Neuroscience, Sense Organs and Locomotor System, AOU Consorziale Policlinico, 70124 Bari, Italy
| | - Giuseppe Solarino
- Orthopaedics Unit-UOSD Vertebral Surgery, DAI Neuroscience, Sense Organs and Locomotor System, AOU Consorziale Policlinico, 70124 Bari, Italy
| | - Alessandro Rizzello
- Clinical Biochemistry, DiBraiN, School of Medicine, University of Bari "Aldo Moro", 70124 Bari, Italy
| | - Vittoria Petruzzella
- Clinical Biochemistry, DiBraiN, School of Medicine, University of Bari "Aldo Moro", 70124 Bari, Italy
| | - Luigi Leonardo Palese
- Clinical Biochemistry, DiBraiN, School of Medicine, University of Bari "Aldo Moro", 70124 Bari, Italy
| | - Salvatore Scacco
- Clinical Biochemistry, DiBraiN, School of Medicine, University of Bari "Aldo Moro", 70124 Bari, Italy
| | - Giuseppe Banfi
- IRCCS Galeazzi-Sant'Ambrogio, Via Cristina Belgioioso 173, 20157 Milano, Italy
- Faculty of Medicine, Università Vita-Salute San Raffaele, Via Olgettina 58, 20132 Milano, Italy
| | - Biagio Moretti
- Orthopaedics Unit-UOSD Vertebral Surgery, DAI Neuroscience, Sense Organs and Locomotor System, AOU Consorziale Policlinico, 70124 Bari, Italy
| | - Antonio Gnoni
- Clinical Biochemistry, DiBraiN, School of Medicine, University of Bari "Aldo Moro", 70124 Bari, Italy
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Fu Y, Cui S, Zhou Y, Qiu L. Dental Pulp Stem Cell-Derived Exosomes Alleviate Mice Knee Osteoarthritis by Inhibiting TRPV4-Mediated Osteoclast Activation. Int J Mol Sci 2023; 24:4926. [PMID: 36902356 PMCID: PMC10003468 DOI: 10.3390/ijms24054926] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2023] [Revised: 02/25/2023] [Accepted: 02/28/2023] [Indexed: 03/08/2023] Open
Abstract
Osteoarthritis (OA) is a degenerative disease that causes chronic pain and joint swelling and even disables millions of patients. However, current non-surgical treatment for OA can only relieve pain without obvious cartilage and subchondral bone repair. Mesenchymal stem cell (MSC)-secreted exosomes have promising therapeutic effects on knee OA, but the efficacy of MSC-exosome therapy is not well determined, and the mechanisms involved are still unclear. In this study, we isolated dental pulp stem cell (DPSC)-derived exosomes by ultracentrifugation and determined the therapeutic effects of a single intra-articular injection of DPSC-derived exosomes in a mice knee OA model. The results showed that the DPSC-derived exosomes effectively improved abnormal subchondral bone remodeling, inhibited the occurrence of bone sclerosis and osteophytes, and alleviated cartilage degradation and synovial inflammation in vivo. Moreover, transient receptor potential vanilloid 4 (TRPV4) was activated during the progression of OA. Enhanced TRPV4 activation facilitated osteoclast differentiation, and TRPV4 inhibition blocked this process in vitro. DPSC-derived exosomes repressed osteoclast activation in vivo by inhibiting TRPV4 activation. Our findings demonstrated that a topical, single injection of DPSC-derived exosomes is a potential strategy for knee OA treatment, and that the exosomes regulated osteoclast activation by TRPV4 inhibition, which may act as a promising target for clinical OA treatment.
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Affiliation(s)
- Yu Fu
- Fourth Clinical Division, Peking University School and Hospital of Stomatology, National Center for Stomatology, National Clinical Research Center for Oral Diseases, National Engineering Research Center of Oral Biomaterials and Digital Medical Devices, Beijing 100081, China
| | - Shengjie Cui
- Department of Orthodontics, Peking University School and Hospital of Stomatology, National Center for Stomatology, National Clinical Research Center for Oral Diseases, National Engineering Research Center of Oral Biomaterials and Digital Medical Devices, Beijing 100081, China
| | - Yanheng Zhou
- Department of Orthodontics, Peking University School and Hospital of Stomatology, National Center for Stomatology, National Clinical Research Center for Oral Diseases, National Engineering Research Center of Oral Biomaterials and Digital Medical Devices, Beijing 100081, China
| | - Lixin Qiu
- Fourth Clinical Division, Peking University School and Hospital of Stomatology, National Center for Stomatology, National Clinical Research Center for Oral Diseases, National Engineering Research Center of Oral Biomaterials and Digital Medical Devices, Beijing 100081, China
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