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Chen R, Tong Y, Hu X, Wang W, Liao F. circSLTM knockdown attenuates chondrocyte inflammation, apoptosis and ECM degradation in osteoarthritis by regulating the miR-515-5p/VAPB axis. Int Immunopharmacol 2024; 138:112435. [PMID: 38981227 DOI: 10.1016/j.intimp.2024.112435] [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: 02/24/2024] [Revised: 05/20/2024] [Accepted: 06/05/2024] [Indexed: 07/11/2024]
Abstract
Osteoarthritis (OA) is a prevalent joint disorder characterized by cartilage degeneration. Circular RNAs (circRNAs) have emerged as pivotal players in OA progression, orchestrating various biological processes such as proliferation, apoptosis, inflammation, and extracellular matrix (ECM) reorganization. Among these circRNAs, circSLTM exhibits aberrant expression in OA, yet its precise regulatory mechanism remains elusive. This study aimed to elucidate the regulatory mechanisms of circSLTM in OA pathogenesis, with a focus on its role as a competing endogenous RNA (ceRNA). Human cartilage tissues were procured from both OA patients and non-OA individuals, while human chondrocyte cells were subjected to lipopolysaccharide (LPS) treatment to mimic OA-like conditions. Our findings revealed upregulation of circSLTM in OA patients and LPS-treated chondrocytes. Loss-of-function assays were conducted, demonstrating that silencing circSLTM via shRNAs mitigated LPS-induced effects on chondrocytes, as evidenced by enhanced proliferation, reduced apoptosis, and inflammatory factors, and altered expression of extracellular matrix proteins. Further exploration into the regulatory mechanism of circSLTM unveiled its interaction with microRNA-515-5p (miR-515-5p) to modulate vesicle-associated membrane protein (VAPB) expression in chondrocytes. VAPB, also upregulated in OA, was positively regulated by circSLTM. Rescue assays corroborated that VAPB overexpression reinstated the protective effects of circSLTM knockdown on LPS-treated chondrocytes. Moreover, concurrent knockdown of both circSLTM and VAPB demonstrated synergistic protection against LPS-induced chondrocyte injury. Additionally, we delineated that LPS triggered the activation of the NF-κB pathway in chondrocytes, which was counteracted by circSLTM silencing. To assess the effects of circSLTM on OA in vivo, anterior cruciate ligament transection (ACLT) mouse models were established, revealing that circSLTM deficiency ameliorated cartilage defects in vivo. In conclusion, circSLTM exacerbates osteoarthritis progression by orchestrating the miR-515-5p/VAPB axis and activating the NF-κB pathway, providing novel insights for targeted therapy in OA management.
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Affiliation(s)
- Rijiang Chen
- Department of Orthopedics, Longyan First Affiliated Hospital of Fujian Medical University, Longyan, Fujian 364000, China.
| | - Yan Tong
- Department of Endocrine, Longyan First Affiliated Hospital of Fujian Medical University, Longyan, Fujian 364000, China.
| | - Xiunian Hu
- Department of Orthopedics, Longyan First Affiliated Hospital of Fujian Medical University, Longyan, Fujian 364000, China.
| | - Wantao Wang
- Department of Orthopedics, Longyan First Affiliated Hospital of Fujian Medical University, Longyan, Fujian 364000, China.
| | - Fake Liao
- Department of Orthopedics, Longyan First Affiliated Hospital of Fujian Medical University, Longyan, Fujian 364000, China.
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Ghafouri-Fard S, Shoorei H, Sabernia T, Hussen BM, Taheri M, Pourmoshtagh H. Circular RNAs and inflammation: Epigenetic regulators with diagnostic role. Pathol Res Pract 2023; 251:154912. [PMID: 38238072 DOI: 10.1016/j.prp.2023.154912] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/12/2023] [Revised: 10/18/2023] [Accepted: 10/26/2023] [Indexed: 01/23/2024]
Abstract
Circular RNAs (circRNAs) are a group of transcripts generally known to be non-coding transcripts, but occasionally producing short peptides. Circ_Ttc3/miR-148a, circ_TLK1/miR-106a-5p, circ_VMA21/miR-9-3p, circ_0068,888/miR-21-5p, circ_VMA21/miR-199a-5p, circ_AFF2/miR-375, circ_0008360/miR-135b-5p and circ-FBXW7/miR-216a-3p are examples of circRNA/miRNA pairs that contribute in the pathogenesis of immune-related conditions. CircRNAs have been found to regulate function of immune system and participate in the pathophysiology of immune-related disorders. In the current study, we searched PubMed and Google Scholar databases until July 2022 with the key words "circRNA" OR "circular RNA" AND "inflammation". Then, we assessed the abstract of retrieved articles to include original articles that assessed contribution of circRNAs in the pathoetiology of inflammation and related disorders. Finally, we went through the main texts of the articles and tabulated the available information. Therefore, the current study summarizes the role of circRNAs in the pathoetiology of sepsis, atherosclerosis, rheumatoid arthritis and osteoarthritis, immune-related cardiovascular, pulmonary, gastrointestinal and nervous system disorders.
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Affiliation(s)
- Soudeh Ghafouri-Fard
- Department of Medical Genetics, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Hamed Shoorei
- Cellular and Molecular Research Center, Birjand University of Medical Sciences, Birjand, Iran; Clinical Research Development Unit of Tabriz Valiasr Hospital, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Toofan Sabernia
- Department of Anatomical Sciences, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran
| | - Bashdar Mahmud Hussen
- Department of Biomedical Sciences, College of Science, Cihan University-Erbil, Kurdistan Region, Iraq; Department of Clinical Analysis, College of Pharmacy, Hawler Medical University, Kurdistan Region, Iraq
| | - Mohammad Taheri
- Institute of Human Genetics, Jena University Hospital, Jena, Germany; Urology and Nephrology Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
| | - Hasan Pourmoshtagh
- Skull Base Research Center, Loghman Hakim Hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
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Li Z, Lu J. CircRNAs in osteoarthritis: research status and prospect. Front Genet 2023; 14:1173812. [PMID: 37229197 PMCID: PMC10203419 DOI: 10.3389/fgene.2023.1173812] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2023] [Accepted: 04/18/2023] [Indexed: 05/27/2023] Open
Abstract
Osteoarthritis (OA) is the most common joint disease globally, and its progression is irreversible. The mechanism of osteoarthritis is not fully understood. Research on the molecular biological mechanism of OA is deepening, among which epigenetics, especially noncoding RNA, is an emerging hotspot. CircRNA is a unique circular noncoding RNA not degraded by RNase R, so it is a possible clinical target and biomarker. Many studies have found that circRNAs play an essential role in the progression of OA, including extracellular matrix metabolism, autophagy, apoptosis, the proliferation of chondrocytes, inflammation, oxidative stress, cartilage development, and chondrogenic differentiation. Differential expression of circRNAs was also observed in the synovium and subchondral bone in the OA joint. In terms of mechanism, existing studies have mainly found that circRNA adsorbs miRNA through the ceRNA mechanism, and a few studies have found that circRNA can serve as a scaffold for protein reactions. In terms of clinical transformation, circRNAs are considered promising biomarkers, but no large cohort has tested their diagnostic value. Meanwhile, some studies have used circRNAs loaded in extracellular vesicles for OA precision medicine. However, there are still many problems to be solved in the research, such as the role of circRNA in different OA stages or OA subtypes, the construction of animal models of circRNA knockout, and more research on the mechanism of circRNA. In general, circRNAs have a regulatory role in OA and have particular clinical potential, but further studies are needed in the future.
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Affiliation(s)
- Zhuang Li
- School of Medicine, Southeast University, Nanjing, Jiangsu, China
| | - Jun Lu
- Department of Orthopaedics, Zhongda Hospital, School of Medicine, Southeast University, Nanjing, Jiangsu, China
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Xue Q, Huang Y, Chang J, Cheng C, Wang Y, Wang X, Miao C. CircRNA-mediated ceRNA mechanism in Osteoarthritis: special emphasis on circRNAs in exosomes and the crosstalk of circRNAs and RNA methylation. Biochem Pharmacol 2023; 212:115580. [PMID: 37148980 DOI: 10.1016/j.bcp.2023.115580] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2023] [Revised: 04/24/2023] [Accepted: 04/26/2023] [Indexed: 05/08/2023]
Abstract
Osteoarthritis (OA) is an age-related joint disease with chronic inflammation, progressive articular cartilage destruction and subchondral bone sclerosis. CircRNAs (circRNAs) are a class of non-coding RNA with a circular structure that participate in a series of important pathophysiological processes of OA, especially its ceRNA mechanisms, and play an important role in OA. CircRNAs may be potential biomarkers for the diagnosis and prognosis of OA. Additionally, differentially expressed circRNAs were found in patients with OA, indicating that circRNAs are involved in the pathogenesis of OA. Experiments have shown that the intra-articular injection of modified circRNAs can effectively relieve OA. Exosomal circRNAs and methylated circRNAs also provide new ideas for the treatment of OA. Clarifying the important roles of circRNAs in OA will deepen people's understanding of the pathogenesis of OA. CircRNAs may be developed as new biomarkers or drug targets for the diagnosis of OA and provide new methods for the treatment of OA.
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Affiliation(s)
- Qiuyun Xue
- Department of Pharmacology, School of Integrated Chinese and Western Medicine, Anhui University of Chinese Medicine, Hefei, China
| | - Yurong Huang
- Department of Pharmacology, School of Integrated Chinese and Western Medicine, Anhui University of Chinese Medicine, Hefei, China
| | - Jun Chang
- Department of Orthopaedics, the First Affiliated Hospital of Anhui Medical University, Hefei, China; Anhui Public Health Clinical Center, Hefei, China.
| | - Chenglong Cheng
- Department of Pharmacology, School of Integrated Chinese and Western Medicine, Anhui University of Chinese Medicine, Hefei, China
| | - Yuting Wang
- Department of Pharmacology, School of Integrated Chinese and Western Medicine, Anhui University of Chinese Medicine, Hefei, China
| | - Xiaomei Wang
- Department of Humanistic Nursing, School of Nursing, Anhui University of Chinese Medicine, Hefei, China.
| | - Chenggui Miao
- Department of Pharmacology, School of Integrated Chinese and Western Medicine, Anhui University of Chinese Medicine, Hefei, China; Institute of Rheumatism, Anhui University of Chinese Medicine, Hefei, China
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Wang H, Zhao J, Wang J. Role of circular RNAs in osteoarthritis: update on pathogenesis and therapeutics. Mol Genet Genomics 2023; 298:791-801. [PMID: 37086279 DOI: 10.1007/s00438-023-02021-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2022] [Accepted: 04/12/2023] [Indexed: 04/23/2023]
Abstract
Osteoarthritis (OA) is a common and crippling joint disease characterized by cartilage degeneration, subchondral bone sclerosis, and synovitis. The main clinical manifestations of OA are chronic joint pain and impaired mobility, which seriously affect patient's quality of life. Circular RNAs (circRNAs) are noncoding RNAs that are widely discovered in eukaryotic cells. Unlike standard linear RNAs, circRNAs form a covalently closed continuous loop structure without a 5' or 3' polarity. Various experiments in recent years have confirmed that numerous circRNAs appear to be differentially expressed in OA cartilage and synovium. And they are closely associated with various pathological progressions in OA, such as extracellular matrix degradation, chondrocyte apoptosis, and inflammation. In this review, we briefly described the biogenesis, characterization, and functions of circRNAs. And we focused on the relationships between circRNAs and OA progression. At last, we further discussed the prospects of clinical applications of circRNAs in OA, with the expectation to provide feasible directions for OA diagnosis and treatment.
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Affiliation(s)
- Hulin Wang
- Department of Orthopedics, Wuwei People's Hospital, Xuanwu Street, Liangzhou District, Wuwei, Gansu, 733000, People's Republic of China
| | - Junjie Zhao
- Department of Orthopedics, Wuwei People's Hospital, Xuanwu Street, Liangzhou District, Wuwei, Gansu, 733000, People's Republic of China
| | - Jin Wang
- Department of Orthopedics, Wuwei People's Hospital, Xuanwu Street, Liangzhou District, Wuwei, Gansu, 733000, People's Republic of China.
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Cai D, Zhang J, Yang J, Lv Q, Zhong C. Overexpression of FTO alleviates osteoarthritis by regulating the processing of miR-515-5p and the TLR4/MyD88/NF-κB axis. Int Immunopharmacol 2023; 114:109524. [PMID: 36538851 DOI: 10.1016/j.intimp.2022.109524] [Citation(s) in RCA: 14] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2022] [Revised: 11/18/2022] [Accepted: 11/27/2022] [Indexed: 12/23/2022]
Abstract
OBJECTIVE Osteoarthritis (OA) is regarded as the most prevalent chronic joint disease. Fat-mass and obesity-associated gene (FTO) is involved in OA alleviation. This study elucidated the role of FTO in OA and the associated mechanism. METHODS We established a cell injury model by stimulating human normal chondrocytes (C28/I2) with lipopolysaccharide (LPS), and measured cell viability, apoptosis, and inflammatory cytokines using CCK-8, flow cytometry, Western blot, and ELISA. TLR4, MyD88, p/t-p65, and p/t-IκBα levels, FTO, COX-2, and iNOS mRNA levels, and m6A methylation levels were measured by Western blot, RT-qPCR, and colorimetry. RNA immunoprecipitation and co-immunoprecipitation were conducted to confirm the interaction between FTO and DGCR8. pri-miR-515-5p process was regulated in an m6A-dependent manner. After predicting the presence of several binding sites between miR-515-5p and TLR4 on Targetscan, we further confirmed their relationship by dual-luciferase assay. OA rat models were established by monosodium iodoacetate injection. The pathological changes in knee joint were observed by HE staining. RESULTS FTO was diminished in LPS-induced C28/I2 cells. With the increase of LPS concentration, cell viability was repressed, apoptosis rate was increased, and inflammatory markers were promoted, which were annulled by FTO overexpression. FTO interacted with DGCR8 and modulated the pri-miR-515-5p processing in an m6A-dependent manner. miR-515-5p silencing partially averted the inhibitory effect of FTO on LPS-induced cell injury. Given that TLR4 was a direct target of miR-515-5p, miR-515-5p inactivated the MyD88/NF-κB pathway by targeting TLR4. FTO overexpression improved cartilage structure in OA rats, reduced apoptosis, inhibited inflammation in synovial fluid, and repressed the TLR4/MyD88/NF-κB axis. CONCLUSION FTO alleviated OA in an m6A-dependent manner via the miR-515-5p/TLR4/MyD88/NF-κB axis.
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Affiliation(s)
- Dongfeng Cai
- Department of Orthopedics, Affiliated Hospital of Zunyi Medical University, No. 149 Dalian Road, Huichuan District, Zunyi, Guizhou 563000, China.
| | - Jing Zhang
- Department of Orthopedics, Affiliated Hospital of Zunyi Medical University, No. 149 Dalian Road, Huichuan District, Zunyi, Guizhou 563000, China
| | - Jin Yang
- Department of Orthopedics, Affiliated Hospital of Zunyi Medical University, No. 149 Dalian Road, Huichuan District, Zunyi, Guizhou 563000, China
| | - Qi Lv
- Department of Orthopedics, Affiliated Hospital of Zunyi Medical University, No. 149 Dalian Road, Huichuan District, Zunyi, Guizhou 563000, China
| | - Chao Zhong
- Department of Orthopedics, Affiliated Hospital of Zunyi Medical University, No. 149 Dalian Road, Huichuan District, Zunyi, Guizhou 563000, China
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Miao Y, Wu J, Wu R, Wang E, Wang J. Circ_0040929 Serves as Promising Biomarker and Potential Target for Chronic Obstructive Pulmonary Disease. Int J Chron Obstruct Pulmon Dis 2022; 17:2079-2092. [PMID: 36101791 PMCID: PMC9464637 DOI: 10.2147/copd.s364553] [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: 03/01/2022] [Accepted: 07/04/2022] [Indexed: 11/23/2022] Open
Abstract
Background Circular RNAs (circRNAs) can act as essential regulators in many diseases, including chronic obstructive pulmonary disease (COPD). We aimed to explore the role and underlying mechanism of circ_0040929 in COPD. Methods A cellular model of COPD was constructed by treating human bronchial epithelial cells (16HBE) with cigarette smoke extract (CSE). The levels of circ_0040929, microRNA-515-5p (miR-515-5p) and insulin-like growth factor-binding protein 3 (IGFBP3) were measured by quantitative real-time PCR. Cell proliferation was assessed by Cell Counting Kit-8 and 5-ethynyl-2'-deoxyuridine assays. Cell apoptosis was evaluated by flow cytometry. Protein expression was measured using Western blot assay. The levels of inflammatory factors and airway remodeling were assayed via enzyme-linked immunosorbent assay. The interaction between miR-515-5p and circ_0040929/IGFBP3 was confirmed by dual-luciferase reporter, RNA pull-down and RNA immunoprecipitation assays. Exosomes were detected using transmission electron microscopy. Results Circ_0040929 expression and IGFBP3 expression were upregulated in the serum of smokers (n = 22) compared to non-smokers (n = 22) and more significantly upregulated in the serum of COPD patients (n = 22). However, miR-515-5p expression was decreased in the serum of smokers compared to non-smokers and further reduced in the serum of COPD. Circ_0040929 knockdown attenuated CSE-induced cell injury by increasing proliferation and reducing apoptosis, inflammation, and airway remodeling in 16HBE cells. MiR-515-5p was a direct target of circ_0040929, and miR-515-5p inhibition reversed the effect of circ_0040929 knockdown in CSE-treated 16HBE cells. IGFBP3 was a direct target of miR-515-5p, and miR-515-5p overexpression alleviated CSE-induced cell injury via targeting IGFBP3. Moreover, circ_0040929 regulated IGFBP3 expression by targeting miR-515-5p. Importantly, circ_0040929 was upregulated in serum exosomes from COPD patients. Conclusion Circ_0040929 played a promoting role in CSE-induced COPD by regulating miR-515-5p/IGFBP3 axis, suggesting that it might be a novel potential target for COPD treatment.
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Affiliation(s)
- Yi Miao
- Department of Respiratory Medicine, Shaanxi Provincial People's Hospital, Xi'an City, 710068, People's Republic of China
| | - Junfang Wu
- Department of Respiratory Medicine, Shaanxi Provincial People's Hospital, Xi'an City, 710068, People's Republic of China
| | - Runmiao Wu
- Department of Respiratory Medicine, Shaanxi Provincial People's Hospital, Xi'an City, 710068, People's Republic of China
| | - Enguang Wang
- Department of Respiratory and Critical Care, the Fifth Affiliated Hospital of Xinjiang Medical University, Urumqi City, 830000, People's Republic of China
| | - Jing Wang
- Department of Clinical Laboratory, Shaanxi Provincial People's Hospital, Xi'an City, 710068, People's Republic of China
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Li N, Wang Y, Wu X. Knockdown of Circ_0037658 Alleviates IL-1β-Induced Osteoarthritis Progression by Serving as a Sponge of miR-665 to Regulate ADAMTS5. Front Genet 2022; 13:886898. [PMID: 36092909 PMCID: PMC9449488 DOI: 10.3389/fgene.2022.886898] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2022] [Accepted: 06/17/2022] [Indexed: 11/21/2022] Open
Abstract
Background: Osteoarthritis (OA) is a chronic musculoskeletal degeneration disease which brings great pain to patients and a tremendous burden on the world’s medical resources. Previous reports have indicated that circular RNAs (circRNAs) are involved in the pathogenesis of OA. The purpose of this study was to explore the role and mechanism of circ_0037658 in the OA cell model. Methods: The content of interleukin-6 (IL-6) and tumor necrosis factor α (TNF-α) was measured using enzyme-linked immunosorbent assay (ELISA). Cell proliferation ability and apoptosis were detected using Cell Counting Kit-8 (CCK-8), 5-ethynyl-2′-deoxyuridine (EDU), and flow cytometry assays. Western blot assay was used to measure the protein levels of Bcl-2-related X protein (Bax), cleaved-caspase-3, MMP13, Aggrecan, and ADAMTS5. The expression of circ_0037658, microRNA-665 (miR-665), and a disintegrin and metalloproteinase with thrombospondin motifs (ADAMTS) 5 was detected using real-time quantitative polymerase chain reaction (RT-qPCR). Dual-luciferase reporter assay and RNA Immunoprecipitation (RIP) assay were manipulated to analyze the relationships of circ_0037658, miR-665, and ADAMTS5. Results: Human chondrocytes (CHON-001 cells) were treated with interleukin-1β (IL-1β) to establish an OA cell model. Circ_0037658 and ADAMTS5 levels were increased, and miR-665 was decreased in OA cartilage samples and IL-1β-treated chondrocyte cells. Moreover, circ_0037658 silencing promoted proliferation and impaired inflammation, apoptosis, and ECM degradation in IL-1β-treated CHON-001 cells. Mechanically, circ_0037658 acted as a sponge for miR-665 to regulate ADAMTS5 expression. Conclusion: Circ_0037658 knockdown relieved IL-1β-triggered chondrocyte injury via regulating the miR-665/ADAMTS5 axis, promising an underlying therapeutic strategy for OA.
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Affiliation(s)
- Ningbo Li
- Department of Orthopedics, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
- Department of Orthopedics, The First Affiliated Hospital of Henan University of Chinese Medicine, Zhengzhou, China
| | - Yongsheng Wang
- Department of Orthopedics, The First Affiliated Hospital of Henan University, Kaifeng, China
| | - Xuejian Wu
- Department of Orthopedics, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
- *Correspondence: Xuejian Wu,
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Wahafu P, Xu A, Zhao B, Tuo Y, Yang J. Circ_0005526 contributes to interleukin-1β-induced chondrocyte injury in osteoarthritis via upregulating transcription factor 4 by interacting with miR-142-5p. Bioengineered 2022; 13:8407-8418. [PMID: 35322736 PMCID: PMC9162016 DOI: 10.1080/21655979.2022.2048773] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Circular RNAs (circRNAs) can regulate the progression of osteoarthritis (OA) via serving as competing endogenous RNAs (ceRNAs). This work was performed for functional research of circ_0005526 in Interleukin-1β (IL-1β)-induced OA injury. Circ_0005526, microRNA-142-5p (miR-142-5p) or transcription factor 4 (TCF4) expression was measured via reverse transcription-quantitative polymerase chain reaction assay. Cell analysis was performed by Cell Counting Kit-8 assay for cell viability, EdU assay for cell proliferation and flow cytometry for cell apoptosis. The protein level detection was conducted using western blot. Target analysis was carried out via dual-luciferase reporter assay and RNA pull-down assay. Circ_0005526 was upregulated in OA cartilage tissues and IL-1β-exposed chondrocyte cells. IL-1β inhibited cell viability and proliferation but enhanced cell apoptosis and inflammation, then these damages were attenuated after downregulation of circ_0005526. Circ_0005526 interacted with miR-142-5p, and circ_0005526 knockdown suppressed IL-1β-induced OA progression through upregulating miR-142-5p. TCF4 was regulated by circ_0005526 via targeting miR-142-5p. The function of circ_0005526 was also achieved by upregulation of TCF4. These results unraveled that circ_0005526 promoted IL-1β-induced chondrocyte injury in OA via suppressing miR-142-5p binding to TCF4.
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Affiliation(s)
- Paerhati Wahafu
- Department of Orthopedics, The Sixth Affiliated Hospital of Xinjiang Medical University, Urumqi, Xinjiang, China
| | - Aixian Xu
- Department of Orthopedics District 1, The People's Hospital of Zhaoyuan City, Zhaoyuan, Shandong, China
| | - Bo Zhao
- Department of Orthopedics, The Sixth Affiliated Hospital of Xinjiang Medical University, Urumqi, Xinjiang, China
| | - Yanan Tuo
- Department of Orthopedics, The Sixth Affiliated Hospital of Xinjiang Medical University, Urumqi, Xinjiang, China
| | - Junkui Yang
- Department of Orthopedics District 2, The People's Hospital of Zhaoyuan City, Zhaoyuan, Shandong, China
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Yan P, Sun C, Luan L, Han J, Qu Y, Zhou C, Xu D. Hsa_circ_0134111 promotes intervertebral disc degeneration via sponging miR-578. Cell Death Dis 2022; 8:55. [PMID: 35136049 PMCID: PMC8827076 DOI: 10.1038/s41420-022-00856-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2021] [Revised: 01/06/2022] [Accepted: 01/27/2022] [Indexed: 11/09/2022]
Abstract
Intervertebral disc degeneration (IDD) is a chronic degenerative and age-dependent process characterized by aberrant apoptosis, proliferation, synthesis, and catabolism of the extracellular matrix of the nucleus pulposus (NP) cells. Recently, studies showed that circular RNAs play important roles in the development of many diseases. However, the role of circRNAs in IDD development remains unknown. We showed that circ_0134111 level was overexpressed in IDD tissue samples as compar-ed to control tissues. The upregulation of circ_0134111 was more drastic in the moderate and severe IDD cases than in those with mild IDD. In addition, we showed that interleukin-1β and tumor necrosis factor-α exposure significantly enhanced circ_0134111 expression in NP cells. Furthermore, ectopic expression of circ_0134111 induced proliferation, pro-inflammatory cytokine secretion, and ECM degradation in the NP cells. We also showed that circ_0134111 directly interacted with microRNA (miR)-578 in NP cells where elevated expression of circ_0134111 enhanced the ADAMTS-5 and MMP-9 expression. Moreover, miR-578 expression was significantly decreased in IDD patients and the miR-578 expression was negatively correlated with circ_0134111 expression in the IDD samples. Interleukin-1β and tumor necrosis factor-α exposure significantly decreased miR-578 levels in NP cells, in which ectopic miR-578 expression inhibited cell growth, pro-inflammatory cytokine expression, and ECM degradation. Finally, we showed that circ_0134111 overexpression induced the IDD-related phenotypic changes through inhibiting miR-578. These data suggested that circ_0134111 could promote the progression of IDD through enhancing aberrant NP cell growth, inflammation, and ECM degradation partly via regulating miR-578.
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Affiliation(s)
- Peng Yan
- Department of Orthopedic Surgery, The Affiliated Hospital of Qingdao University, 266000, Qingdao, Shandong, China
| | - Chong Sun
- Department of Orthopedic Surgery, The Affiliated Hospital of Qingdao University, 266000, Qingdao, Shandong, China
| | - Liangrui Luan
- Department of Orthopedic Surgery, The Affiliated Hospital of Qingdao University, 266000, Qingdao, Shandong, China
| | - Jialuo Han
- Department of Orthopedic Surgery, The Affiliated Hospital of Qingdao University, 266000, Qingdao, Shandong, China
| | - Yang Qu
- Department of Orthopedic Surgery, The Affiliated Hospital of Qingdao University, 266000, Qingdao, Shandong, China
| | - Chuanli Zhou
- Department of Orthopedic Surgery, The Affiliated Hospital of Qingdao University, 266000, Qingdao, Shandong, China
| | - Derong Xu
- Department of Orthopedic Surgery, The Affiliated Hospital of Qingdao University, 266000, Qingdao, Shandong, China.
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11
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Deng W, Wang X, Zhang J, Zhao S. Circ_0138959/miR-495-3p/TRAF6 axis regulates proliferation, wound healing and osteoblastic differentiation of periodontal ligament cells in periodontitis. J Dent Sci 2022; 17:1125-1134. [PMID: 35784154 PMCID: PMC9236932 DOI: 10.1016/j.jds.2022.01.010] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2021] [Revised: 01/13/2022] [Indexed: 01/14/2023] Open
Abstract
Background/purpose Periodontitis is a chronic inflammatory disease, and periodontal ligament cells (PDLCs) are pivotal for osteogenesis. Circular RNAs (circRNAs) can regulate disease progression via targeting miRNA/mRNA axis. The purposes of this study were to explore the function and mechanism of circ_0138959 in periodontitis. Materials and methods Periodontitis cell model was established by lipopolysaccharide (LPS) treatment in PDLCs. RNA expression was determined by quantitative reverse transcription-polymerase chain reaction assay. Cell proliferation was detected using 3-(4, 5-dimethylthiazol-2-y1)-2, 5-diphenyl tetrazolium bromide assay. Wound healing and cell apoptosis were examined by wound healing assay and flow cytometry. Inflammatory cytokines were measured via Enzyme-linked immunosorbent assay. Osteogenic differentiation was assessed by Alkaline phosphatase and Alizarin red S staining assays. Western blot was used for protein detection. The target interaction was validated by dual-luciferase reporter assay. Results Circ_0138959 was overexpressed in periodontitis tissues and LPS-treated PDLCs. Downregulation of circ_0138959 attenuated LPS-induced inhibition of proliferation, wound healing and osteogenic differentiation but promotion of apoptosis and inflammation. Circ_0138959 acted as a miR-495-3p sponge, and the regulatory role of circ_0138959 in LPS-induced cell injury was achieved by sponging miR-495-3p. Additionally, miR-495-3p targeted TNF Receptor Associated Factor 6 (TRAF6) and miR-495-3p protected against LPS-induced cell dysfunction by targeting TRAF6. Circ_0138959 upregulated TRAF6 level via inhibiting miR-495-3p. Conclusion This study suggested that circ_0138959 upregulated the TRAF6 expression by binding to miR-495-3p, consequently aggravating LPS-induced cell damages in PDLCs. Circ_0138959 might be a probable target for treatment of periodontitis.
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Affiliation(s)
- Wenjuan Deng
- Department of Stomatology, Gaoxin Branch of Jinan Stomatological Hospital, Jinan, Shandong, China
| | - Xiaoliang Wang
- Department of Stomatology, Gaoxin Branch of Jinan Stomatological Hospital, Jinan, Shandong, China
| | - Jin Zhang
- Department of Stomatology, Gaoxin Branch of Jinan Stomatological Hospital, Jinan, Shandong, China
| | - Sainan Zhao
- Department of Stomatology, Affiliated Hospital of Shandong University of Traditional Chinese Medicine, Jinan, China
- Corresponding author. Department of stomatology, Affiliated Hospital of Shandong University of Traditional Chinese Medicine, No. 16369, Jingshi Road, Jinan City, Shandong Province, 250014, China.
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Kim J. Dysregulated circular RNAs and their pathological implications in knee osteoarthritis: potential novel therapeutic targets and diagnostic biomarkers. ALL LIFE 2022. [DOI: 10.1080/26895293.2021.2020172] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
Affiliation(s)
- Jaehee Kim
- Department of Alternative Medicine, Graduate School of Alternative Medicine, Kyonggi University (Seoul Campus), Seoul, Republic of Korea
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Hsa_circ_0134111 promotes osteoarthritis progression by regulating miR-224-5p/CCL1 interaction. Aging (Albany NY) 2021; 13:20383-20394. [PMID: 34413269 PMCID: PMC8436948 DOI: 10.18632/aging.203420] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2021] [Accepted: 07/17/2021] [Indexed: 11/25/2022]
Abstract
Mechanical, metabolic, inflammatory, and immune factors contribute to the development of osteoarthritis (OA), a joint disease characterized by cartilage destruction. The circular RNA (circRNA) hsa_circ_0134111 is upregulated in the cartilage of OA patients; however, its potential role in OA pathogenesis and progression remains unexplored. In this study, the effects of hsa_circ_0134111 knockdown were evaluated in primary human chondrocytes treated with IL-1β to simulate OA, as well as in a rat model of OA. Hsa_circ_0134111 expression was upregulated in IL-1β-stimulated chondrocytes. CCK-8 and flow cytometry assays showed that hsa_circ_0134111 knockdown reversed IL-1β-induced cell decline by inhibiting apoptosis. Following prediction analysis of circRNA and miRNA targets, dual-luciferase reporter and silencing/overexpression assays suggested that a regulatory network composed of hsa_circ_0134111, miR-224-5p, and CCL1 modulates IL-1β-mediated OA-like effects in chondrocytes. Accordingly, CCL1 overexpression abrogated the prosurvival effects of hsa_circ_0134111 knockdown in vitro. Moreover, hsa_circ_0134111 silencing in vivo alleviated cartilage destruction in an OA rat model, decreased IL-6 and TNF-α levels in synovial fluid, and downregulated CCL1 expression in the affected joints. These results suggest that hsa_circ_0134111 contributes to OA development by binding to miR-224-5p, thereby releasing the inhibition that miR-224-5p exerts over CCL1.
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Yu J, Kang X, Xiong Y, Luo Q, Dai D, Ye J. Gene Expression Profiles of Circular RNAs and MicroRNAs in Chronic Rhinosinusitis With Nasal Polyps. Front Mol Biosci 2021; 8:643504. [PMID: 34124144 PMCID: PMC8194396 DOI: 10.3389/fmolb.2021.643504] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2020] [Accepted: 04/26/2021] [Indexed: 11/13/2022] Open
Abstract
Introduction: Chronic rhinosinusitis (CRS) is often classified primarily on the basis of the absence or presence of nasal polyps (NPs), that is, as CRS with nasal polyps (CRSwNP) or CRS without nasal polyps (CRSsNP). Additionally, according to the percentage of eosinophils, CRSwNP can be further divided into eosinophilic CRSwNP (ECRSwNP) and non-ECRSwNP. CRSwNP is a significant public health problem with a considerable socioeconomic burden. Previous research reported that the pathophysiology of CRSwNP is a complex, multifactorial disease. There have been many studies on its etiology, but its pathogenesis remains unclear. Dysregulated expression of microRNAs (miRNAs) has been shown in psoriasis, rheumatoid arthritis, pulmonary fibrosis, and allergic asthma. Circular RNAs (circRNAs) are also involved in inflammatory diseases such as rheumatoid arthritis, septic acute kidney injury, myocardial ischemia/reperfusion injury, and sepsis-induced liver damage. The function of miRNAs in various diseases, including CRSwNP, is a research hotspot. In contrast, there have been no studies on circRNAs in CRSwNP. Overall, little is known about the functions of circRNAs and miRNAs in CRSwNP. This study aimed to investigate the expression of circRNAs and miRNAs in a CRSwNP group and a control group to determine whether these molecules are related to the occurrence and development of CRSwNP. Methods: Nine nasal mucosa samples were collected, namely, three ECRSwNP samples, three non-ECRSwNP samples, and three control samples, for genomic microarray analysis of circRNA and microRNA expression. All of the tissue samples were from patients who were undergoing functional endoscopic sinus surgery in our department. Then we selected some differentially expressed miRNAs and circRNAs for qPCR verification. Meanwhile, GO enrichment analysis and KEGG pathway analysis were applied to predict the biological functions of aberrantly expressed circRNAs and miRNAs based on the GO and KEGG databases. Receiver operating characteristic (ROC) curve analysis and principal component analysis (PCA) were performed to confirm these molecules are involved in the occurrence and development of CRSwNP. Results: In total, 2,875 circRNAs showed significant differential expression in the CRSwNP group. Specifically, 1794 circRNAs were downregulated and 1,081 circRNAs were upregulated. In the CRSwNP group, the expression of 192 miRNAs was significantly downregulated, and none of the miRNAs were significantly upregulated. GO and KEGG analysis showed differential circRNAs and miRNAs were enriched in “amoebiasis,” “salivary secretion,” “pathways in cancer,” and “endocytosis.” Through qRT-PCR verification, the expression profiles of hsa-circ-0031593, hsa-circ-0031594, hsa-miR-132-3p, hsa-miR-145-5p, hsa-miR-146a-5p, and hsa-miR-27b-3p were shown to have statistical differences. In addition, ROC curve analysis showed that the molecules with the two highest AUCs were hsa-circ-0031593 with AUC 0.8353 and hsa-miR-145-5p with AUC 0.8690. Through PCA with the six ncRNAs, the first principal component explained variance ratio was 98.87%. The AUC of the six ncRNAs was 0.8657. Conclusion: In our study, the expression profiles of ECRSwNP and non-ECRSwNP had no statistical differences. The differentially expressed circRNAs and miRNAs between CRSwNP and control may play important roles in the pathogenesis of CRSwNP. Altered expression of hsa-circ-0031593 and hsa-miR-145-5p have the strongest evidence for involvement in the occurrence and development of CRSwNP because their AUCs are higher than the other molecules tested in this study.
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Affiliation(s)
- Jieqing Yu
- Department of Otorhinolaryngology Head and Neck Surgery, The First Affiliated Hospital of Nanchang University, Nanchang, China.,Jiangxi Otorhinolaryngology Head and Neck Surgery Institute, Nanchang, China
| | - Xue Kang
- Department of Otorhinolaryngology Head and Neck Surgery, The First Affiliated Hospital of Nanchang University, Nanchang, China.,Department of Otorhinolaryngology Head and Neck Surgery, Jiangxi Provincial Children's Hospital, Nanchang, China
| | - Yuanping Xiong
- Department of Otorhinolaryngology Head and Neck Surgery, The First Affiliated Hospital of Nanchang University, Nanchang, China
| | - Qing Luo
- Department of Otorhinolaryngology Head and Neck Surgery, The First Affiliated Hospital of Nanchang University, Nanchang, China
| | - Daofeng Dai
- Department of Otorhinolaryngology Head and Neck Surgery, The First Affiliated Hospital of Nanchang University, Nanchang, China
| | - Jing Ye
- Department of Otorhinolaryngology Head and Neck Surgery, The First Affiliated Hospital of Nanchang University, Nanchang, China.,Jiangxi Otorhinolaryngology Head and Neck Surgery Institute, Nanchang, China
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