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Huang H, Yang L, He H, Zhou B, Qin Z, Zheng L, Shen C. Construction of mitochondrial-targeting nano-prodrug for enhanced Rhein delivery and treatment for osteoarthritis in vitro. Int J Pharm 2024; 661:124397. [PMID: 38945463 DOI: 10.1016/j.ijpharm.2024.124397] [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: 04/21/2024] [Revised: 06/18/2024] [Accepted: 06/26/2024] [Indexed: 07/02/2024]
Abstract
Rhein, a natural anthraquinone compound derived from traditional Chinese medicine, exhibits potent anti-inflammatory properties via modulating the level of Reactive oxygen or nitrogen species (RONS). Nevertheless, its limited solubility in water, brief duration of plasma presence, as well as its significant systemic toxicity, pose obstacles to its in vivo usage, necessitating the creation of a reliable drug delivery platform to circumvent these difficulties. In this study, an esterase-responsive and mitochondria-targeted nano-prodrug was synthesized by conjugating Rhein with the polyethylene glycol (PEG)-modified triphenyl phosphonium (TPP) molecule, forming TPP-PEG-RH, which could spontaneously self-assemble into RPT NPs when dispersed in aqueous media. The TPP outer layer of these nanoparticles enhances their pharmacokinetic profile, facilitates efficient delivery to mitochondria, and promotes cellular uptake, thereby enabling enhanced accumulation in mitochondria and improved therapeutic effects in vitro. The decline in RONS was observed in IL-1β-stimulated chondrocyte after RPT NPs treating. RPT NPs also exert excellent anti-inflammatory (IL-1β, TNF-α, IL-6 and MMP-13) and antioxidative effects (Cat and Sod) via the Nrf2 signalling pathway, upregulation of cartilage related genes (Col2a1 and Acan). Moreover, RPT NPs shows protection of mitochondrial membrane potential and inhibition of chondrocyte apoptosis. Moreover, These findings suggest that the mitochondria-targeted polymer-Rhein conjugate may offer a therapeutic solution for patients suffering from chronic joint disorders, by attenuating the progression of osteoarthritis (OA).
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Affiliation(s)
- Hongjun Huang
- Department of Orthopaedics, Affiliated Hospital of Guilin Medical University, Guilin, Guangxi 541000, China
| | - Lerong Yang
- Department of Orthopaedics, Affiliated Hospital of Guilin Medical University, Guilin, Guangxi 541000, China
| | - Haoqiang He
- Guangxi Engineering Center in Biomedical Materials for Tissue and Organ Regeneration, Collaborative Innovation Centre of Regenerative Medicine and Medical BioResource Development and Application, The First Affiliated Hospital of Guangxi Medical University, Nanning 530021, China
| | - Bo Zhou
- Guangxi Engineering Center in Biomedical Materials for Tissue and Organ Regeneration, Collaborative Innovation Centre of Regenerative Medicine and Medical BioResource Development and Application, The First Affiliated Hospital of Guangxi Medical University, Nanning 530021, China
| | - Zainen Qin
- Guangxi Engineering Center in Biomedical Materials for Tissue and Organ Regeneration, Collaborative Innovation Centre of Regenerative Medicine and Medical BioResource Development and Application, The First Affiliated Hospital of Guangxi Medical University, Nanning 530021, China; Life Sciences Institute, Guangxi Medical University, Nanning, 530021, China; Guangxi Key Laboratory of Regenerative Medicine, International Joint Laboratory on Regeneration of Bone and Soft Tissue, The First Affiliated Hospital of Guangxi Medical University, Nanning 530021, China.
| | - Li Zheng
- Guangxi Engineering Center in Biomedical Materials for Tissue and Organ Regeneration, Collaborative Innovation Centre of Regenerative Medicine and Medical BioResource Development and Application, The First Affiliated Hospital of Guangxi Medical University, Nanning 530021, China; Life Sciences Institute, Guangxi Medical University, Nanning, 530021, China; Guangxi Key Laboratory of Regenerative Medicine, International Joint Laboratory on Regeneration of Bone and Soft Tissue, The First Affiliated Hospital of Guangxi Medical University, Nanning 530021, China.
| | - Chong Shen
- Department of Orthopaedics, Affiliated Hospital of Guilin Medical University, Guilin, Guangxi 541000, China.
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Ni D, Lin X, Deng C, Yuan L, Li J, Liu Y, Liang P, Jiang B. Energy Metabolism: From Physiological Changes to Targets in Sepsis-induced Cardiomyopathy. Hellenic J Cardiol 2024:S1109-9666(24)00114-3. [PMID: 38734307 DOI: 10.1016/j.hjc.2024.05.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2024] [Revised: 03/07/2024] [Accepted: 05/04/2024] [Indexed: 05/13/2024] Open
Abstract
Sepsis is a systemic inflammatory response syndrome caused by a variety of dysregulated responses to host infection with life-threatening multi-organ dysfunction. Among the injuries or dysfunctions involved in the course of sepsis, cardiac injury and dysfunction often occur and are associated with the pathogenesis of hemodynamic disturbances, also defined as sepsis-induced cardiomyopathy (SIC). The process of myocardial metabolism is tightly regulated and adapts to various cardiac output demands. The heart is a metabolically flexible organ capable of utilizing all classes of energy substrates, including carbohydrates, lipids, amino acids, and ketone bodies to produce ATP. The demand of cardiac cells for energy metabolism changes substantially in septic cardiomyopathy with distinct etiological causes and different times. This review describes changes in cardiomyocyte energy metabolism under normal physiological conditions and some features of myocardial energy metabolism in septic cardiomyopathy, and briefly outlines the role of the mitochondria as a center of energy metabolism in the septic myocardium, revealing that changes in energy metabolism can serve as a potential future therapy for infectious cardiomyopathy.
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Affiliation(s)
- Dan Ni
- Department of Pathophysiology, Sepsis Translational Medicine Key Laboratory of Hunan Province, Xiangya School of Medicine, Central South University, Changsha, Hunan, China; National Medicine Functional Experimental Teaching Center, Central South University, Changsha, Hunan China
| | - Xiaofang Lin
- Department of Pathophysiology, Sepsis Translational Medicine Key Laboratory of Hunan Province, Xiangya School of Medicine, Central South University, Changsha, Hunan, China; National Medicine Functional Experimental Teaching Center, Central South University, Changsha, Hunan China
| | - Chuanhuang Deng
- Department of Pathophysiology, Sepsis Translational Medicine Key Laboratory of Hunan Province, Xiangya School of Medicine, Central South University, Changsha, Hunan, China; National Medicine Functional Experimental Teaching Center, Central South University, Changsha, Hunan China
| | - Ludong Yuan
- Department of Pathophysiology, Sepsis Translational Medicine Key Laboratory of Hunan Province, Xiangya School of Medicine, Central South University, Changsha, Hunan, China; National Medicine Functional Experimental Teaching Center, Central South University, Changsha, Hunan China
| | - Jing Li
- Department of Pathophysiology, Sepsis Translational Medicine Key Laboratory of Hunan Province, Xiangya School of Medicine, Central South University, Changsha, Hunan, China; National Medicine Functional Experimental Teaching Center, Central South University, Changsha, Hunan China
| | - Yuxuan Liu
- Department of Pathophysiology, Sepsis Translational Medicine Key Laboratory of Hunan Province, Xiangya School of Medicine, Central South University, Changsha, Hunan, China; National Medicine Functional Experimental Teaching Center, Central South University, Changsha, Hunan China
| | - Pengfei Liang
- Department of Burns and Plastic Surgery, Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Bimei Jiang
- Department of Pathophysiology, Sepsis Translational Medicine Key Laboratory of Hunan Province, Xiangya School of Medicine, Central South University, Changsha, Hunan, China; National Medicine Functional Experimental Teaching Center, Central South University, Changsha, Hunan China.
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Ni C, Zhang W, Qiu S, Cheng H, Ma C. Long Non-coding RNA DLEU1 Promotes Progression of Osteoarthritis via miR-492/ TLR8 Axis. Curr Pharm Biotechnol 2024; 25:2166-2181. [PMID: 38321900 DOI: 10.2174/0113892010275579240116061104] [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: 09/18/2023] [Revised: 12/25/2023] [Accepted: 01/01/2024] [Indexed: 02/08/2024]
Abstract
BACKGROUND Long non-coding RNAs (LncRNAs) are generally reported to participate in the development of Osteoarthritis (OA) by acting as competing endogenous RNAs (ceRNAs). However, the molecular mechanism is largely unknown. This study aimed to investigate the possible mechanisms contributing to osteoarthritis (OA). METHODS Four gene expression profiles from patients with OA were downloaded from a public database and integrated to screen important RNAs associated with OA. Differentially expressed (DE) lncRNAs, microRNAs (miRNAs), and mRNAs were filtered, and a ceRNA network was constructed. An in vitro OA model was established by treating chondrocytes with IL-1β. The expression levels of MMP-13, COL2A1, aggrecan, and RUNX2 were detected by qRT-PCR and western blot. Cell proliferation ability was detected by CCK-8 assay. Flow cytometry was used for apoptosis assay. A dual luciferase reporter gene was used to confirm the relationship between DLEU1, miR-492, and TLR8. RESULTS An OA-related ceRNA network, including 11 pathways, 3 miRNAs, 7 lncRNAs, and 16 mRNAs, was constructed. DLEU1 and TLR8 were upregulated, and miR-492 was downregulated in IL-1β-induced chondrocytes. Overexpression of DLEU1 suppressed viability and promoted apoptosis and extracellular matrix (ECM) degradation in IL-1β induced chondrocytes. Luciferase reporter assay validated the regulatory relations among DLEU1, miR-492, and TLR8. Further study revealed that the effects of DLEU1 on chondrocytes could be reversed by miR-492. CONCLUSION DLEU1 may be responsible for the viability, apoptosis, and ECM degradation in OA via miR-492/TLR8 axis.
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Affiliation(s)
- Chenzhe Ni
- Department of Orthopaedics, Qidong People's Hospital, Nantong University, Jiangsu, 226200, China
| | - Wanglin Zhang
- Department of Orthopaedics, Shanghai Children's Medical Center, Shanghai Jiaotong University School of Medicine, Shanghai, 200127, China
| | - Sai Qiu
- Department of Orthopaedics, Qidong People's Hospital, Nantong University, Jiangsu, 226200, China
| | - Hao Cheng
- Department of Orthopaedics, Qidong People's Hospital, Nantong University, Jiangsu, 226200, China
| | - Chunhui Ma
- Department of Orthopaedics, Shanghai General Hospital, Shanghai Jiao Tong University, Shanghai, 200080, China
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Xiong B, Chen L, Huang Y, Lu G, Chen C, Nong J, Pan H. ZBTB16 eases lipopolysaccharide‑elicited inflammation, apoptosis and degradation of extracellular matrix in chondrocytes during osteoarthritis by suppressing GRK2 transcription. Exp Ther Med 2023; 25:276. [PMID: 37206562 PMCID: PMC10189728 DOI: 10.3892/etm.2023.11975] [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: 09/26/2022] [Accepted: 01/23/2023] [Indexed: 05/21/2023] Open
Abstract
Osteoarthritis (OA) is a chronic degenerative disease of the bone that is a major contributor of disability in the elderly population. Zinc finger and BTB domain-containing 16 (ZBTB16) is a transcription factor that has been previously revealed to be impaired in human OA tissues. The present study was designed to elaborate the potential impact of ZBTB16 on OA and to possibly assess any latent regulatory mechanism. ZBTB16 expression in human OA tissues was examined using the Gene Expression Series (GSE) database (https://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?acc=GSE169077) whereas ZBTB16 expression in chondrocytes was examined using reverse transcription-quantitative PCR (RT-qPCR) and western blotting. Cell viability was examined using a Cell Counting Kit-8 assay. A TUNEL assay and western blotting were used to assess cell apoptosis and apoptosis-related markers, including Bcl-2, Bax and cleaved caspase-3. The levels and expression of inflammatory factors, including TNF-α, IL-1β and IL-6, were determined by ELISA and western blotting. RT-qPCR and western blotting were also used to analyze the expression levels of extracellular matrix (ECM)-degrading enzymes, including MMP-13, a disintegrin-like and metalloproteinase with thrombospondin type-1 motifs-5, aggrecan and collagen type II α1. After the potential binding of ZBTB16 with the G protein coupled receptor kinase type 2 (GRK2) promoter was predicted using the Cistrome DB database, GRK2 expression was confirmed by RT-qPCR and western blotting. Chromatin immunoprecipitation and luciferase reporter assays were then used to determine the potential interaction between ZBTB16 and the GRK2 promoter. Following GRK2 overexpression in ZBTB16-overexpressing chondrocytes by co-transfection of GRK2 and ZBTB16 overexpression plasmids, the aforementioned functional experiments were performed again. ZBTB16 expression was found to be reduced in human OA tissues compared with in normal cartilage tissues and lipopolysaccharide (LPS)-stimulated chondrocytes. ZBTB16 overexpression increased cell viability whilst decreasing apoptosis, inflammation and ECM degradation by LPS-treated chondrocytes. In addition, GRK2 expression was found to be increased in LPS-stimulated chondrocytes. ZBTB16 successfully bound to the GRK2 promoter, which negatively modulated GRK2 expression. GRK2 upregulation reversed the effects of ZBTB16 overexpression on the viability, apoptosis, inflammation and ECM degradation by LPS-challenged chondrocytes. In conclusion, these data suggest that ZBTB16 may inhibit the development of OA through the transcriptional inactivation of GRK2.
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Affiliation(s)
- Bo Xiong
- Department of Orthopaedics and Traumatology, First Affiliated Hospital of The Guangxi University of Chinese Medicine, Nanning, Guangxi 530000, P.R. China
| | - Lihua Chen
- Department of Orthopaedics and Traumatology, First Affiliated Hospital of The Guangxi University of Chinese Medicine, Nanning, Guangxi 530000, P.R. China
| | - Yue Huang
- Department of Orthopaedics and Traumatology, First Affiliated Hospital of The Guangxi University of Chinese Medicine, Nanning, Guangxi 530000, P.R. China
| | - Guanyu Lu
- Department of Orthopaedics and Traumatology, First Affiliated Hospital of The Guangxi University of Chinese Medicine, Nanning, Guangxi 530000, P.R. China
| | - Cai Chen
- Department of Orthopaedics and Traumatology, First Affiliated Hospital of The Guangxi University of Chinese Medicine, Nanning, Guangxi 530000, P.R. China
| | - Jiao Nong
- Teaching Department, First Affiliated Hospital of The Guangxi University of Chinese Medicine, Nanning, Guangxi 530000, P.R. China
| | - Haida Pan
- Department of Orthopaedics and Traumatology, Yongjia County Traditional Chinese Medicine Hospital, Wenzhou, Zhejiang 325100, P.R. China
- Correspondence to: Dr Haida Pan, Department of Orthopaedics and Traumatology, Yongjia County Traditional Chinese Medicine Hospital, 6 Park Road, Jiangbei Street, Yongjia, Wenzhou, Zhejiang 325100, P.R. China
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Wang H, Su J, Yu M, Xia Y, Wei Y. PGC-1α in osteoarthritic chondrocytes: From mechanism to target of action. Front Pharmacol 2023; 14:1169019. [PMID: 37089944 PMCID: PMC10117990 DOI: 10.3389/fphar.2023.1169019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2023] [Accepted: 03/30/2023] [Indexed: 04/08/2023] Open
Abstract
Osteoarthritis (OA) is one of the most common degenerative joint diseases, often involving the entire joint. The degeneration of articular cartilage is an important feature of OA, and there is growing evidence that the mitochondrial biogenesis master regulator peroxisome proliferator-activated receptor γ coactivator 1α (PGC-1α) exert a chondroprotective effect. PGC-1α delays the development and progression of OA by affecting mitochondrial biogenesis, oxidative stress, mitophagy and mitochondrial DNA (mtDNA) replication in chondrocytes. In addition, PGC-1α can regulate the metabolic abnormalities of OA chondrocytes and inhibit chondrocyte apoptosis. In this paper, we review the regulatory mechanisms of PGC-1α and its effects on OA chondrocytes, and introduce potential drugs and novel nanohybrid for the treatment of OA which act by affecting the activity of PGC-1α. This information will help to further elucidate the pathogenesis of OA and provide new ideas for the development of therapeutic strategies for OA.
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Affiliation(s)
- Haochen Wang
- Department of Orthopedics, Shengjing Hospital of China Medical University, Shenyang, China
| | - Jianbang Su
- Department of Orthopedics, Shengjing Hospital of China Medical University, Shenyang, China
| | - Minghao Yu
- Department of Orthopedics, Shengjing Hospital of China Medical University, Shenyang, China
| | - Yang Xia
- Department of Clinical Epidemiology, Shengjing Hospital of China Medical University, Shenyang, China
- *Correspondence: Yang Xia, ; Yingliang Wei,
| | - Yingliang Wei
- Department of Orthopedics, Shengjing Hospital of China Medical University, Shenyang, China
- *Correspondence: Yang Xia, ; Yingliang Wei,
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Zhang Y, Hou M, Liu Y, Liu T, Chen X, Shi Q, Geng D, Yang H, He F, Zhu X. Recharge of chondrocyte mitochondria by sustained release of melatonin protects cartilage matrix homeostasis in osteoarthritis. J Pineal Res 2022; 73:e12815. [PMID: 35726138 DOI: 10.1111/jpi.12815] [Citation(s) in RCA: 20] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/15/2022] [Revised: 05/21/2022] [Accepted: 06/09/2022] [Indexed: 11/28/2022]
Abstract
Recent evidence indicates that the mitochondrial functions of chondrocytes are impaired in the pathogenesis of osteoarthritis (OA). Melatonin can attenuate cartilage degradation through its antioxidant functions. This study aims to investigate whether melatonin could rescue the impaired mitochondrial functions of OA chondrocytes and protect cartilage metabolism. OA chondrocytes showed a compromised matrix synthesis capacity associated with mitochondrial dysfunction and aberrant oxidative stress. In vitro treatments with melatonin promoted the expression of cartilage extracellular matrix (ECM) components, improved adenosine triphosphate production, and attenuated mitochondrial oxidative stress. Mechanistically, either silencing of SOD2 or inhibition of SIRT1 abolished the protective effects of melatonin on mitochondrial functions and ECM synthesis. To achieve a sustained release effect, a melatonin-laden drug delivery system (DDS) was developed and intra-articular injection with DDS successfully improved cartilage matrix degeneration in a posttraumatic rat OA model. These findings demonstrate that melatonin-mediated recharge of mitochondria to rescue the mitochondrial functions of chondrocytes represents a promising therapeutic strategy to protect cartilage from OA.
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Affiliation(s)
- Yijian Zhang
- Department of Orthopaedics, The First Affiliated Hospital of Soochow University, Soochow University, Suzhou, Jiangsu, China
- Department of Orthopaedic Surgery, Orthopaedic Institute, Medical College, Soochow University, Suzhou, Jiangsu, China
| | - Mingzhuang Hou
- Department of Orthopaedics, The First Affiliated Hospital of Soochow University, Soochow University, Suzhou, Jiangsu, China
- Department of Orthopaedic Surgery, Orthopaedic Institute, Medical College, Soochow University, Suzhou, Jiangsu, China
| | - Yang Liu
- Department of Orthopaedics, The First Affiliated Hospital of Soochow University, Soochow University, Suzhou, Jiangsu, China
- Department of Orthopaedic Surgery, Orthopaedic Institute, Medical College, Soochow University, Suzhou, Jiangsu, China
| | - Tao Liu
- Department of Orthopaedics, The First Affiliated Hospital of Soochow University, Soochow University, Suzhou, Jiangsu, China
- Department of Orthopaedic Surgery, Orthopaedic Institute, Medical College, Soochow University, Suzhou, Jiangsu, China
| | - Xi Chen
- Department of Pathology, The Third Affiliated Hospital of Soochow University, Changzhou, Jiangsu, China
| | - Qin Shi
- Department of Orthopaedics, The First Affiliated Hospital of Soochow University, Soochow University, Suzhou, Jiangsu, China
- Department of Orthopaedic Surgery, Orthopaedic Institute, Medical College, Soochow University, Suzhou, Jiangsu, China
| | - Dechun Geng
- Department of Orthopaedics, The First Affiliated Hospital of Soochow University, Soochow University, Suzhou, Jiangsu, China
- Department of Orthopaedic Surgery, Orthopaedic Institute, Medical College, Soochow University, Suzhou, Jiangsu, China
| | - Huilin Yang
- Department of Orthopaedics, The First Affiliated Hospital of Soochow University, Soochow University, Suzhou, Jiangsu, China
- Department of Orthopaedic Surgery, Orthopaedic Institute, Medical College, Soochow University, Suzhou, Jiangsu, China
| | - Fan He
- Department of Orthopaedics, The First Affiliated Hospital of Soochow University, Soochow University, Suzhou, Jiangsu, China
- Department of Orthopaedic Surgery, Orthopaedic Institute, Medical College, Soochow University, Suzhou, Jiangsu, China
| | - Xuesong Zhu
- Department of Orthopaedics, The First Affiliated Hospital of Soochow University, Soochow University, Suzhou, Jiangsu, China
- Department of Orthopaedic Surgery, Orthopaedic Institute, Medical College, Soochow University, Suzhou, Jiangsu, China
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[The role of chondrocyte mitochondrial biogenesis in the pathogenesis of osteoarthritis]. ZHONGGUO XIU FU CHONG JIAN WAI KE ZA ZHI = ZHONGGUO XIUFU CHONGJIAN WAIKE ZAZHI = CHINESE JOURNAL OF REPARATIVE AND RECONSTRUCTIVE SURGERY 2022; 36:242-248. [PMID: 35172413 PMCID: PMC8863531 DOI: 10.7507/1002-1892.202109091] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
OBJECTIVE To summarize the role of chondrocytes mitochondrial biogenesis in the pathogenesis of osteoarthritis (OA), and analyze the applications in the treatment of OA. METHODS A review of recent literature was conducted to summarize the changes in mitochondrial biogenesis in the course of OA, the role of major signaling molecules in OA chondrocytes, and the prospects for OA therapeutic applications. RESULTS Recent studies reveales that mitochondria are significant energy metabolic centers in chondrocytes and its dysfunction has been considered as an essential mechanism in the pathogenesis of OA. Mitochondrial biogenesis is one of the key processes maintaining the normal quantity and function of mitochondria, and peroxisome proliferator-activated receptor-gamma coactivator 1 alpha (PGC-1α) is the central regulator of this process. A regulatory network of mitochondrial biogenesis with PGC-1α as the center, adenosine monophosphate-activated protein kinase, sirtuin1/3, and cyclic adenosine monophosphate response element-binding protein as the main upstream regulatory molecules, and nuclear respiratory factor 1, estrogen-related receptor α, and nuclear respiratory factor 2 as the main downstream regulatory molecules has been reported. However, the role of mitochondrial biogenesis in OA chondrocytes still needs further validation and in-depth exploration. It has been demonstrated that substances such as puerarin and omentin-1 can retard the development of OA by activating the damaged mitochondrial biogenesis in OA chondrocytes, which proves the potential to be used in the treatment OA. CONCLUSION Mitochondrial biogenesis in chondrocytes plays an important role in the pathogenesis of OA, and further exploring the related mechanisms is of great clinical significance.
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Chen Y, Wu YY, Si HB, Lu YR, Shen B. Mechanistic insights into AMPK-SIRT3 positive feedback loop-mediated chondrocyte mitochondrial quality control in osteoarthritis pathogenesis. Pharmacol Res 2021; 166:105497. [PMID: 33609697 DOI: 10.1016/j.phrs.2021.105497] [Citation(s) in RCA: 35] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/14/2020] [Revised: 02/09/2021] [Accepted: 02/14/2021] [Indexed: 02/08/2023]
Abstract
Osteoarthritis (OA) is a major cause of disability in the elderly population and represents a significant public health problem and socioeconomic burden worldwide. However, no disease-modifying therapeutics are currently available for OA due to an insufficient understanding of the pathogenesis of this disability. As a unique cell type in cartilage, chondrocytes are essential for cartilage homeostasis and play a critical role in OA pathogenesis. Mitochondria are important metabolic centers in chondrocytes and contribute to cell survival, and mitochondrial quality control (MQC) is an emerging mechanism for maintaining cell homeostasis. An increasing number of recent studies have demonstrated that dysregulation of the key processes of chondrocyte MQC, which involve mitochondrial redox, biogenesis, dynamics, and mitophagy, is associated with OA pathogenesis and can be regulated by the chondroprotective molecules 5' adenosine monophosphate-activated protein kinase (AMPK) and sirtuin 3 (SIRT3). Moreover, AMPK and SIRT3 regulate each other, and their expression and activity are always consistent in chondrocytes, which suggests the existence of an AMPK-SIRT3 positive feedback loop (PFL). Although the precise mechanisms are not fully elucidated and need further validation, the current literature indicates that this AMPK-SIRT3 PFL regulates OA development and progression, at least partially by mediating chondrocyte MQC. Therefore, understanding the mechanisms of AMPK-SIRT3 PFL-mediated chondrocyte MQC in OA pathogenesis might yield new ideas and potential targets for subsequent research on the OA pathomechanism and therapeutics.
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Affiliation(s)
- Yang Chen
- Department of Orthopaedics, Key Laboratory of Transplant Engineering and Immunology, Regenerative Medicine Research Center, West China Hospital, Sichuan University, Chengdu 610041, China
| | - Yong-Yao Wu
- West China College of Stomatology, Sichuan University, Chengdu 610041, China
| | - Hai-Bo Si
- Department of Orthopaedics, Key Laboratory of Transplant Engineering and Immunology, Regenerative Medicine Research Center, West China Hospital, Sichuan University, Chengdu 610041, China.
| | - Yan-Rong Lu
- Department of Orthopaedics, Key Laboratory of Transplant Engineering and Immunology, Regenerative Medicine Research Center, West China Hospital, Sichuan University, Chengdu 610041, China
| | - Bin Shen
- Department of Orthopaedics, Key Laboratory of Transplant Engineering and Immunology, Regenerative Medicine Research Center, West China Hospital, Sichuan University, Chengdu 610041, China
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