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He Y, Liu S, Lin H, Ding F, Shao Z, Xiong L. Roles of organokines in intervertebral disc homeostasis and degeneration. Front Endocrinol (Lausanne) 2024; 15:1340625. [PMID: 38532900 PMCID: PMC10963452 DOI: 10.3389/fendo.2024.1340625] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/18/2023] [Accepted: 02/19/2024] [Indexed: 03/28/2024] Open
Abstract
The intervertebral disc is not isolated from other tissues. Recently, abundant research has linked intervertebral disc homeostasis and degeneration to various systemic diseases, including obesity, metabolic syndrome, and diabetes. Organokines are a group of diverse factors named for the tissue of origin, including adipokines, osteokines, myokines, cardiokines, gastrointestinal hormones, and hepatokines. Through endocrine, paracrine, and autocrine mechanisms, organokines modulate energy homeostasis, oxidative stress, and metabolic balance in various tissues to mediate cross-organ communication. These molecules are involved in the regulation of cellular behavior, inflammation, and matrix metabolism under physiological and pathological conditions. In this review, we aimed to summarize the impact of organokines on disc homeostasis and degeneration and the underlying signaling mechanism. We focused on the regulatory mechanisms of organokines to provide a basis for the development of early diagnostic and therapeutic strategies for disc degeneration.
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Affiliation(s)
- Yuxin He
- Department of Orthopaedics, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Sheng Liu
- Department of Orthopaedics, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Hui Lin
- Department of Orthopaedics, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Fan Ding
- Department of Orthopaedics, JingMen Central Hospital, Jingmen, China
- Hubei Minzu University, Enshi, China
| | - Zengwu Shao
- Department of Orthopaedics, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Liming Xiong
- Department of Orthopaedics, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
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Yang K, Ma Y, Xie C, He L, Zhao H, Dai Z, Wang X. Dexmedetomidine combined with propofol attenuates myocardial ischemia/reperfusion injury by activating the AMPK signaling pathway. Heliyon 2023; 9:e22054. [PMID: 38034796 PMCID: PMC10682120 DOI: 10.1016/j.heliyon.2023.e22054] [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: 05/16/2023] [Revised: 11/02/2023] [Accepted: 11/02/2023] [Indexed: 12/02/2023] Open
Abstract
Objective Myocardial ischemia/reperfusion (MI/R) injury is a major cause of cardiac tissue damage, with high disability and death rates. Although both dexmedetomidine (Dex) and propofol (PPF) have been indicated to alleviate MI/R injury in rat models, the effects of the combined use of these two drugs remain unclear. This study aimed to investigate the combined effects of Dex and PPF against MI/R injury and related mechanisms. Methods A rat model of MI/R injury was established and used to explore the combined effects of Dex and PPF on MI/R injury. Hematoxylin-eosin (HE) and Masson staining were used for histopathological evaluation. 2,3,5-triphenyltetrazolium chloride (TTC), echocardiography, terminal deoxynucleotidyl transferase dUTP nick-end labeling (TUNEL) staining were used to determine myocardial infarction size, cardiac function, and apoptosis, respectively. Enzyme-linked immunosorbent assay (ELISA) was performed to assess myocardial function and oxidative stress (OS). Autophagy was observed through transmission electron microscopy. Moreover, western blotting was conducted to detect autophagy markers and the AMPK pathway. Results The combination of Dex and PPF alleviated histopathological injury, reduced myocardial infarction, and rescued cardiac dysfunction in MI/R rats. Furthermore, Dex combined with PPF decreased the levels of MDA and ROS and increased the SOD level in MI/R rats. Besides, Dex combined with PPF inhibited myocardial apoptosis in MI/R rats. After combined treatment with Dex and PPF, the number of autophagosomes, expression levels of Beclin-1 and LC3II/LC3I were elevated, while the expression levels of p62 were reduced in MI/R rats. The combined use of Dex and PPF activated the AMPK pathway in MI/R rats. Compound C (an AMPK inhibitor) could abolish the combined effects of Dex and PPF on alleviating myocardial injury and enhancing autophagy in MI/R rats. Conclusion The combination of Dex and PPF attenuated MI/R injury in rats, which may be associated with the activation of the AMPK signaling pathway.
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Affiliation(s)
| | | | - Chunmei Xie
- Department of Anesthesiology, Fuwai Yunnan Cardiovascular Hospital, Kunming, Yunnan, 650000, China
| | - Lixian He
- Department of Anesthesiology, Fuwai Yunnan Cardiovascular Hospital, Kunming, Yunnan, 650000, China
| | - Haoxing Zhao
- Department of Anesthesiology, Fuwai Yunnan Cardiovascular Hospital, Kunming, Yunnan, 650000, China
| | - Zheng Dai
- Department of Anesthesiology, Fuwai Yunnan Cardiovascular Hospital, Kunming, Yunnan, 650000, China
| | - Xiaoqi Wang
- Department of Anesthesiology, Fuwai Yunnan Cardiovascular Hospital, Kunming, Yunnan, 650000, China
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Zhu J, Sun R, Yan C, Sun K, Gao L, Zheng B, Shi J. Hesperidin mitigates oxidative stress-induced ferroptosis in nucleus pulposus cells via Nrf2/NF-κB axis to protect intervertebral disc from degeneration. Cell Cycle 2023; 22:1196-1214. [PMID: 37055945 PMCID: PMC10193898 DOI: 10.1080/15384101.2023.2200291] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2022] [Revised: 03/11/2023] [Accepted: 04/03/2023] [Indexed: 04/15/2023] Open
Abstract
Intervertebral disc degeneration (IVDD), a widely known contributor to low back pain (LBP), has been proved to be a global health challenging conundrum. Hesperidin (hesperetin-7-O-rutinoside, HRD) is a flavanone glycoside that belongs to the subgroup of citrus flavonoids with therapeutic effect on various diseases due to its anti-inflammatory, antioxidant properties. However, the effect of HRD on IVDD remains elusive. The human nucleus pulposus tissues were harvested for isolating human nucleus pulposus (HNP) cells to verify the expression of Nrf2. The biological effect of HRD on HNP cells were assessed in vitro, and the in vivo therapeutic effects of HRD were assessed in mice. Firstly, we found that the expression of Nrf2 was decreased with the progression of degeneration in degenerated human nucleus pulposus tissue. Subsequently, we confirmed that HRD could mitigate oxidative stress-induced ferroptosis in nucleus pulposus cells via enhancing the expression of Nrf2 axis and suppressing the NF-κB pathway to protect intervertebral disc from degeneration in vitro. Finally, the therapeutic effects of HRD were confirmed in vivo. The current study proved for the first time that HRD may protect HNP cells from degeneration by suppressing ferroptosis in an oxidative stress-dependent via enhancing the expression of Nrf2 and suppressing the NF-κB pathway. The evidence will provide a possible basis for future targeted treatment for IVDD.
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Affiliation(s)
- Jian Zhu
- Department of Orthopedics, Changzheng Hospital, Naval Medical University, Shanghai, China
| | - Ruping Sun
- School of Health Science and Engineering, University of Shanghai for Science and Technology, Shanghai, China
| | - Chen Yan
- Department of Orthopedics, Changzheng Hospital, Naval Medical University, Shanghai, China
| | - Kaiqiang Sun
- Department of Orthopaedic Surgery, Naval Medical Center, Naval Medical University, Shanghai, China
| | - Lu Gao
- Department of Department of Physiology, Naval Medical University, Shanghai, China
| | - Bing Zheng
- Department of Orthopedics, Changzheng Hospital, Naval Medical University, Shanghai, China
| | - Jiangang Shi
- Department of Orthopedics, Changzheng Hospital, Naval Medical University, Shanghai, China
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Wang C, Chen R, Zhu X, Zhang X. Long non-coding RNAs LINC00689 inhibits the apoptosis of human nucleus pulposus cells via miR-3127-5p/ATG7 axis-mediated autophagy. Open Med (Wars) 2022; 17:1821-1832. [DOI: 10.1515/med-2022-0544] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2022] [Revised: 07/20/2022] [Accepted: 07/20/2022] [Indexed: 11/23/2022] Open
Abstract
Abstract
This study aimed to explore the effects of long non-coding RNAs LINC00689 (LINC00689) in human nucleus pulposus cells (NPCs). NPCs were isolated and their morphology was observed. The proliferation and apoptosis of NPCs, and the levels of LINC00689, miR-3127-5p, Bax, Bcl-2, Cleaved caspase-3, ATG5, ATG7, p62, and LC3Ⅱ/LC3I were detected. Interrelations of LINC00689, miR-3127-5p, and ATG7 were analyzed. LINC00689 was down-regulated yet miR-3127-5p was up-regulated in NPCs. LINC00689 could competitively bind with miR-3127-5p, and ATG7 was targeted by miR-3127-5p in NPCs. Overexpressed LINC00689 promoted proliferation yet inhibited apoptosis of NPCs, whereas LINC00689 silencing did the opposite. Overexpressed LINC00689 raised ATG7 level and LC3Ⅱ/LC3I value yet reduced that of p62 level, but the depletion of LINC00689 did the contrary. ATG7 silencing abolished the effects of overexpressed LINC00689 in NPCs, and likewise, up-regulation of miR-3127-5p overturned the effects of overexpressed LINC00689 in NPCs. Collectively, the up-regulation of LINC00689 inhibits the apoptosis of NPCs via miR-3127-5p/ATG7 axis-mediated autophagy.
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Affiliation(s)
- Changsheng Wang
- Department of Spinal Surgery, First Affiliated Hospital of Fujian Medical University , No. 20, Chazhong Road, Taijiang District , Fuzhou City , Fujian Province, 350005 , China
| | - Rongsheng Chen
- Department of Spinal Surgery, First Affiliated Hospital of Fujian Medical University , Fuzhou City , Fujian Province, 350005 , China
| | - Xitian Zhu
- Department of Spinal Surgery, First Affiliated Hospital of Fujian Medical University , Fuzhou City , Fujian Province, 350005 , China
| | - Xiaobo Zhang
- Department of Spinal Surgery, First Affiliated Hospital of Fujian Medical University , Fuzhou City , Fujian Province, 350005 , China
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Bahar ME, Hwang JS, Ahmed M, Lai TH, Pham TM, Elashkar O, Akter KM, Kim DH, Yang J, Kim DR. Targeting Autophagy for Developing New Therapeutic Strategy in Intervertebral Disc Degeneration. Antioxidants (Basel) 2022; 11:antiox11081571. [PMID: 36009290 PMCID: PMC9405341 DOI: 10.3390/antiox11081571] [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] [Received: 07/18/2022] [Revised: 08/11/2022] [Accepted: 08/11/2022] [Indexed: 12/25/2022] Open
Abstract
Intervertebral disc degeneration (IVDD) is a prevalent cause of low back pain. IVDD is characterized by abnormal expression of extracellular matrix components such as collagen and aggrecan. In addition, it results in dysfunctional growth, senescence, and death of intervertebral cells. The biological pathways involved in the development and progression of IVDD are not fully understood. Therefore, a better understanding of the molecular mechanisms underlying IVDD could aid in the development of strategies for prevention and treatment. Autophagy is a cellular process that removes damaged proteins and dysfunctional organelles, and its dysfunction is linked to a variety of diseases, including IVDD and osteoarthritis. In this review, we describe recent research findings on the role of autophagy in IVDD pathogenesis and highlight autophagy-targeting molecules which can be exploited to treat IVDD. Many studies exhibit that autophagy protects against and postpones disc degeneration. Further research is needed to determine whether autophagy is required for cell integrity in intervertebral discs and to establish autophagy as a viable therapeutic target for IVDD.
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Affiliation(s)
- Md Entaz Bahar
- Department of Biochemistry and Convergence Medical Science, Institute of Health Sciences, College of Medicine, Gyeongsang National University, Jinju 52727, GyeongNam, Korea
| | - Jin Seok Hwang
- Department of Biochemistry and Convergence Medical Science, Institute of Health Sciences, College of Medicine, Gyeongsang National University, Jinju 52727, GyeongNam, Korea
| | - Mahmoud Ahmed
- Department of Biochemistry and Convergence Medical Science, Institute of Health Sciences, College of Medicine, Gyeongsang National University, Jinju 52727, GyeongNam, Korea
| | - Trang Huyen Lai
- Department of Biochemistry and Convergence Medical Science, Institute of Health Sciences, College of Medicine, Gyeongsang National University, Jinju 52727, GyeongNam, Korea
| | - Trang Minh Pham
- Department of Biochemistry and Convergence Medical Science, Institute of Health Sciences, College of Medicine, Gyeongsang National University, Jinju 52727, GyeongNam, Korea
| | - Omar Elashkar
- Department of Biochemistry and Convergence Medical Science, Institute of Health Sciences, College of Medicine, Gyeongsang National University, Jinju 52727, GyeongNam, Korea
| | - Kazi-Marjahan Akter
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Gyeongsang National University, Jinju 52828, GyeongNam, Korea
| | - Dong-Hee Kim
- Department of Orthopaedic Surgery, Institute of Health Sciences, Gyeongsang National University Hospital and Gyeongsang National University College of Medicine, Jinju 52727, GyeongNam, Korea
| | - Jinsung Yang
- Department of Biochemistry and Convergence Medical Science, Institute of Health Sciences, College of Medicine, Gyeongsang National University, Jinju 52727, GyeongNam, Korea
| | - Deok Ryong Kim
- Department of Biochemistry and Convergence Medical Science, Institute of Health Sciences, College of Medicine, Gyeongsang National University, Jinju 52727, GyeongNam, Korea
- Correspondence: ; Tel.: +82-55-772-8054
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Mechanism of Long Noncoding RNA HOTAIR in Nucleus Pulposus Cell Autophagy and Apoptosis in Intervertebral Disc Degeneration. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2022; 2022:8504601. [PMID: 35027936 PMCID: PMC8752263 DOI: 10.1155/2022/8504601] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/05/2021] [Revised: 11/03/2021] [Accepted: 11/22/2021] [Indexed: 12/11/2022]
Abstract
Objective Intervertebral disc degeneration (IDD) contributes to cervical and lumbar diseases. Long noncoding RNAs (lncRNAs) are implicated in IDD. This study explored the mechanism of lncRNA HOTAIR in IDD. Methods Normal and degenerative nucleus pulposus (NP) cells were isolated from NP tissues obtained in intervertebral disc surgery. Cell morphology was observed by immunocytochemistry staining and toluidine blue staining. NP cell markers were detected by RT-qPCR. Proliferation was detected by MTT assay. Autophagy-related proteins were detected by Western blot. Autophagosome was observed by monodansylcadaverine fluorescence staining. Apoptosis was detected by TUNEL staining and flow cytometry. si-HOTAIR and/or miR-148a inhibitor was introduced into degenerative NP cells. Binding relationships among HOTAIR, miR-148a, and PTEN were predicted and verified by dual-luciferase reporter assay and RNA pull-down. Finally, IDD rat models were established. Rat caudal intervertebral discs were assessed by HE staining. Expressions of HOTAIR, miR-148a, and PTEN were determined by RT-qPCR. Results HOTAIR was highly expressed in degenerative NP cells (p < 0.05). si-HOTAIR inhibited degenerative NP cell apoptosis and autophagy (p < 0.05). HOTAIR upregulated PTEN as a sponge of miR-148a. miR-148a was poorly expressed in degenerative NP cells. miR-148a deficiency partially reversed the inhibition of si-HOTAIR on degenerative NP cell autophagy and apoptosis (all p < 0.05). In vivo assay confirmed that si-HOTAIR impeded autophagy and apoptosis in intervertebral disc tissues, thus improving pathological injury in IDD rats (all p < 0.05). Conclusion LncRNA HOTAIR promoted NP cell autophagy and apoptosis via promoting PTEN expression as a ceRNA of miR-148a in IDD.
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Wu H, Xue Y, Zhang Y, Wang Y, Hou J. PTH1-34 promotes osteoblast formation through Beclin1-dependent autophagic activation. J Bone Miner Metab 2021; 39:572-582. [PMID: 33818629 DOI: 10.1007/s00774-021-01212-7] [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: 08/25/2020] [Accepted: 02/08/2021] [Indexed: 12/08/2022]
Abstract
INTRODUCTION PTH1-34 can stimulate osteoblast formation, which contributes to the improvement of bone loss. PTH1-34 can activate autophagy, and autophagy plays a key role in osteoblast formation. This study aimed to explore the role of autophagy in PTH1-34-regulated osteoblastogenesis. MATERIALS AND METHODS In this study, the mice treated with ovariectomy (OVX mice) were used to observe the effect of PTH1-34 on the formation and autophagy of osteoblasts in trabecular bone in vivo. Osteoblast precursor cell line MC3T3-E1 was treated with PTH1-34, and then the autophagic parameters of osteoblast precursors (including autophagic proteins and autophagosome formation) were detected using Western Blotting and Transmission Electron Microscopy. Next, after using autophagic pharmacological inhibitor (3-MA) and silencing vectors of autophagic molecule Beclin1 to downregulate autophagic activity, the parameters related to osteogenesis (including ALP staining intensity, ALP activity, cell proliferation and osteoblastic protein expression) were evaluated using corresponding assays. RESULTS In vivo results showed that PTH1-34 not only improved bone loss caused by OVX but also restored Beclin1 expression and autophagic activity of immature osteoblasts in bone tissues. In vitro assays also showed that treatment of PTH1-34 enhanced the autophagy in osteoblast precursors. Moreover, under PTH1-34 intervention, the upregulated osteogenic parameters were reversed by autophagic inhibition with 3-MA. Of note, Beclin1 silencing can recover the osteogenic activity enhanced by PTH1-34. CONCLUSION PTH1-34 can enhance the autophagic activity of osteoblast precursors, which is involved in PTH1-34-regulated osteoblast formation. Furthermore, Beclin1, as a key autophagic regulator, plays a pivotal role in PTH1-34-regulated osteoblast precursor autophagy and osteoblastogenesis.
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Affiliation(s)
- Haojie Wu
- Shengli Clinical Medical College of Fujian Medical University, Fuzhou, 350001, Fujian, China
| | - Ying Xue
- Shengli Clinical Medical College of Fujian Medical University, Fuzhou, 350001, Fujian, China
- Department of Internal Medicine, Fujian Provincial Hospital South Branch, Fuzhou, 350001, Fujian, China
| | - Yang Zhang
- Shengli Clinical Medical College of Fujian Medical University, Fuzhou, 350001, Fujian, China
- Department of Endocrinology, Fujian Provincial Hospital Key Laboratory of Endocrinology, No.134 Dong Jie Road, Fuzhou, 350001, Fujian, China
| | - Yongxuan Wang
- Shengli Clinical Medical College of Fujian Medical University, Fuzhou, 350001, Fujian, China
- Department of Endocrine, Sanming First Hospital, The Affiliated Sanming First Hospital of Fujian Medical University, Sanming, 365000, Fujian, China
| | - Jianming Hou
- Shengli Clinical Medical College of Fujian Medical University, Fuzhou, 350001, Fujian, China.
- Department of Endocrinology, Fujian Provincial Hospital Key Laboratory of Endocrinology, No.134 Dong Jie Road, Fuzhou, 350001, Fujian, China.
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Biological Factors, Metals, and Biomaterials Regulating Osteogenesis through Autophagy. Int J Mol Sci 2020; 21:ijms21082789. [PMID: 32316424 PMCID: PMC7215394 DOI: 10.3390/ijms21082789] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Revised: 04/10/2020] [Accepted: 04/13/2020] [Indexed: 01/18/2023] Open
Abstract
Bone loss raises great concern in numerous situations, such as ageing and many diseases and in both orthopedic and dentistry fields of application, with an extensive impact on health care. Therefore, it is crucial to understand the mechanisms and the determinants that can regulate osteogenesis and ensure bone balance. Autophagy is a well conserved lysosomal degradation pathway, which is known to be highly active during differentiation and development. This review provides a revision of the literature on all the exogen factors that can modulate osteogenesis through autophagy regulation. Metal ion exposition, mechanical stimuli, and biological factors, including hormones, nutrients, and metabolic conditions, were taken into consideration for their ability to tune osteogenic differentiation through autophagy. In addition, an exhaustive overview of biomaterials, both for orthopedic and dentistry applications, enhancing osteogenesis by modulation of the autophagic process is provided as well. Already investigated conditions regulating bone regeneration via autophagy need to be better understood for finely tailoring innovative therapeutic treatments and designing novel biomaterials.
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Autophagy in bone homeostasis and the onset of osteoporosis. Bone Res 2019; 7:28. [PMID: 31666998 PMCID: PMC6804951 DOI: 10.1038/s41413-019-0058-7] [Citation(s) in RCA: 116] [Impact Index Per Article: 23.2] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2019] [Revised: 05/28/2019] [Accepted: 06/02/2019] [Indexed: 02/06/2023] Open
Abstract
Autophagy is an evolutionarily conserved intracellular process, in which domestic cellular components are selectively digested for the recycling of nutrients and energy. This process is indispensable for cell homeostasis maintenance and stress responses. Both genetic and functional studies have demonstrated that multiple proteins involved in autophagic activities are critical to the survival, differentiation, and functioning of bone cells, including osteoblasts, osteocytes, and osteoclasts. Dysregulation at the level of autophagic activity consequently disturbs the balance between bone formation and bone resorption and mediates the onset and progression of multiple bone diseases, including osteoporosis. This review aims to introduce the topic of autophagy, summarize the understanding of its relevance in bone physiology, and discuss its role in the onset of osteoporosis and therapeutic potential.
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Zhao L, Tian B, Xu Q, Zhang C, Zhang L, Fang H. Extensive mechanical tension promotes annulus fibrosus cell senescence through suppressing cellular autophagy. Biosci Rep 2019; 39:BSR20190163. [PMID: 30910846 PMCID: PMC6470409 DOI: 10.1042/bsr20190163] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2019] [Revised: 03/14/2019] [Accepted: 03/24/2019] [Indexed: 12/20/2022] Open
Abstract
Background: Mechanical load contributes a lot to the initiation and progression of disc degeneration. Annulus fibrosus (AF) cell biology under mechanical tension remains largely unclear.Objective: The present study was aimed to investigate AF cell senescence under mechanical tension and the potential role of autophagy.Methods: Rat AF cells were cultured and experienced different magnitudes (5% elongation and 20% elongation) of mechanical tension for 12 days. Control AF cells were kept static. Cell proliferation, telomerase activity, cell cycle fraction, and expression of senescence-related molecules (p16 and p53) and matrix macromolecules (aggrecan and collagen I) were analyzed to evaluate cell senescence. In addition, expression of Beclin-1 and LC3, and the ratio of LC3-II to LC3-I were analyzed to investigate cell autophagy.Results: Compared with the control group and 5% tension group, 20% tension group significantly decreased cell proliferation potency and telomerase activity, increased G1/G0 phase fraction, and up-regulated gene/protein expression of p16 and p53, whereas down-regulated gene/protein expression of aggrecan and collagen I. In addition, autophagy-related parameters such as gene/protein expression of Beclin-1 and LC3, and the ratio of LC3-II to LC3-I, were obviously suppressed in the 20% tension group.Conclusion: High mechanical tension promotes AF cell senescence though suppressing cellular autophagy. The present study will help us to better understand AF cell biology under mechanical tension and mechanical load-related disc degeneration.
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Affiliation(s)
- Liang Zhao
- Department of Emergency Trauma Surgery, Jining NO.1 People's Hospital, Affiliated Jining NO.1 People's Hospital of Jining Medical University, Jining Medical University, Jining, Shandong 272000, China
| | - Baofang Tian
- Department of Emergency Trauma Surgery, Jining NO.1 People's Hospital, Affiliated Jining NO.1 People's Hospital of Jining Medical University, Jining Medical University, Jining, Shandong 272000, China
| | - Qing Xu
- Department of Anesthesia Surgery, Jining NO.1 People's Hospital, Affiliated Jining NO.1 People's Hospital of Jining Medical University, Jining Medical University, Jining, Shandong 272000, China
| | - Cunxin Zhang
- Department of Spine Surgery, Jining NO.1 People's Hospital, Affiliated Jining NO.1 People's Hospital of Jining Medical University, Jining Medical University, Jining, Shandong 272000, China
| | - Luo Zhang
- Department of Emergency Trauma Surgery, Jining NO.1 People's Hospital, Affiliated Jining NO.1 People's Hospital of Jining Medical University, Jining Medical University, Jining, Shandong 272000, China
| | - Haolin Fang
- Department of Emergency Trauma Surgery, Jining NO.1 People's Hospital, Affiliated Jining NO.1 People's Hospital of Jining Medical University, Jining Medical University, Jining, Shandong 272000, China
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