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Nijiati Y, Song J, Huang P, Wu C, Ma R, Ning B. Impact of endoplasmic reticulum stress on chondrocyte apoptosis in rat model of DDH. J Orthop Res 2024; 42:993-1000. [PMID: 38047481 DOI: 10.1002/jor.25763] [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: 09/20/2023] [Revised: 11/23/2023] [Accepted: 11/28/2023] [Indexed: 12/05/2023]
Abstract
Developmental dysplasia of the hip (DDH) is a developmental disorder characterized by acetabular dysplasia leading to early osteoarthritis. This study examines the role of endoplasmic reticulum stress (ERS) in chondrocyte apoptosis and cartilage degeneration within a DDH model. In the rat model of DDH, created using a swaddling technique, significant deformities in the femoral head and acetabulum were observed, alongside an upregulation of matrix metalloproteinase-13 in acetabular cartilage. We also noted increased levels of apoptosis and ERS-related factors in the acetabular cartilage of DDH models. Additionally, rat chondrocytes exposed to high-magnitude cyclic tensile strain (CTS, 1 Hz, 10% equibiaxial strain) in vitro exhibited elevated ERS and increased apoptosis. Importantly, treatment with the ERS inhibitor 4-phenylbutyric acid effectively suppressed apoptosis induced by CTS in chondrocytes. Our findings suggest that ERS contributes to the upregulation of apoptosis-related factors in chondrocytes within the DDH model, indicating the potential of ERS modulation as a therapeutic approach for DDH-related cartilage degeneration.
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Affiliation(s)
- Yaxier Nijiati
- Department of Pediatric Orthopaedics, National Children's Medical Center, Children's Hospital of Fudan University, Shanghai, China
| | - Jun Song
- Department of Pediatric Orthopaedics, National Children's Medical Center, Children's Hospital of Fudan University, Shanghai, China
| | - Peng Huang
- Department of Pediatric Orthopaedics, National Children's Medical Center, Children's Hospital of Fudan University, Shanghai, China
| | - Chunxing Wu
- Department of Pediatric Orthopaedics, National Children's Medical Center, Children's Hospital of Fudan University, Shanghai, China
| | - Ruixue Ma
- Department of Pediatric Orthopaedics, National Children's Medical Center, Children's Hospital of Fudan University, Shanghai, China
| | - Bo Ning
- Department of Pediatric Orthopaedics, National Children's Medical Center, Children's Hospital of Fudan University, Shanghai, China
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Liu DD, Zhao YC, Li HH, Yin LJ, Chen JQ, Liu G. Endoplasmic reticulum stress-related protein GRP78 and CHOP levels in synovial fluid correlate with disease progression of primary knee osteoarthritis: A cross-sectional study. J Appl Biomed 2024; 22:40-48. [PMID: 38505969 DOI: 10.32725/jab.2024.001] [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: 07/11/2023] [Accepted: 01/18/2024] [Indexed: 03/21/2024] Open
Abstract
BACKGROUND Endoplasmic reticulum (ER) stress has been shown to play an important role in osteoarthritis (OA). OBJECTIVE This study was aimed at assessing the relationship of endoplasmic reticulum (ER) stress-related glucose-regulated protein 78 (GRP78) and CCAAT/enhancer-binding protein homologous protein (CHOP) concentrations in the serum/synovial fluid (SF) with disease severity of primary knee osteoarthritis (pkOA). METHODS Patients with pkOA together with healthy individuals were consecutively recruited from our hospital. The levels of GRP78 and CHOP in serum / SF were detected using enzyme-linked immunosorbent assay. The levels of IL-6 and MMP-3 were also examined. Radiographic progression of pkOA was evaluated based on Kellgren-Lawrence (K-L) grades. Receiver Operating Characteristic (ROC) curves were used to assess the diagnostic value of GRP78/CHOP levels with regard to K-L grades. The assessment of clinical severity was conducted using the visual analogue scale (VAS), Oxford knee score (OKS), and Lequesne algofunctional index (LAI). RESULTS A total of 140 pkOA patients and 140 healthy individuals were included. Serum GRP78 and CHOP levels in pkOA patients were not significantly different from those in healthy individuals. The SF GRP78 and CHOP levels in healthy controls were not detected due to ethical reasons. Compared to those with K-L grade 2 and 3, the pkOA patients with K-L grade 4 had higher GRP78 and CHOP levels in the SF with statistical significance. In addition, the pkOA patients with K-L grade 3 exhibited drastically upregulated GRP78 and CHOP concentrations in the SF compared to those with K-L grade 2. Positive correlations of GRP78 and CHOP levels with K-L grades, IL-6, and MMP-3 levels in the SF were observed. ROC curve analysis indicated that both GRP78 and CHOP levels may act as decent indicators with regard to OA. GRP78 and CHOP concentrations in the SF were positively correlated with VAS/LAI score and negatively associated with OKS score. CONCLUSION The study indicated that GRP78 and CHOP levels in the SF but not the serum were positively correlated with disease severity of pkOA.
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Affiliation(s)
| | | | - Hai-Hong Li
- Southern Medical University, The Third Affiliated Hospital, Department of Rehabilitation, 510630 Guangzhou, Guangdong Province, China
| | - Lian-Jun Yin
- Southern Medical University, The Third Affiliated Hospital, Department of Rehabilitation, 510630 Guangzhou, Guangdong Province, China
| | | | - Gang Liu
- Southern Medical University, Nanfang Hospital, Department of Rehabilitation Medicine, 510515 Guangzhou, Guangdong Province, China
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Gwam C, Ohanele C, Hamby J, Chughtai N, Mufti Z, Ma X. Human placental extract: a potential therapeutic in treating osteoarthritis. ANNALS OF TRANSLATIONAL MEDICINE 2023; 11:322. [PMID: 37404996 PMCID: PMC10316113 DOI: 10.21037/atm.2019.10.20] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2019] [Accepted: 09/29/2019] [Indexed: 09/19/2023]
Abstract
Osteoarthritis (OA) is a degenerative joint disease marked by cartilage degradation and loss of function. Recently, there have been increased efforts to attenuate and reverse OA by stimulating cartilage regeneration and preventing cartilage degradation. Human placental extract (HPE) may be an option due to its anti-inflammatory, antioxidant, and growth stimulatory properties. These properties are useful in preventing cell death and senescence, which may optimize in-situ cartilage regeneration. In this review, we discuss the anatomy and physiology of the placenta, as well as explore in vivo and in vitro studies assessing its effects on tissue regeneration. Finally, we assess the potential role of HPE in cartilage regenerative medicine and OA. The Medline database was utilized for all studies that involved the use of HPE or human placenta hydrolysate. Exclusion criteria included articles not written in English, conference reviews, editorials, letters to the editor, surveys, case reports, and case series. HPE had significant anti-inflammatory and regenerative properties in vitro and in vivo. Furthermore, HPE had a role in attenuating cellular senescence and cell apoptosis via reduction of reactive oxidative species both in vitro and in vivo. One study explored the effects of HPE in OA and demonstrated reduction in cartilage catabolic gene expression, indicating HPE's effect in attenuating OA. HPE houses favorable properties that can attenuate and reverse tissue damage. This may be a beneficial therapeutic in OA as it creates a more favorable environment for in-situ cartilage regeneration. More well designed in-vitro and in-vivo studies are needed to define the role of HPE in treating OA.
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Affiliation(s)
- Chukwuweike Gwam
- Department of Orthopedic Surgery, Wake Forest School of Medicine, Winston-Salem, NC, USA
| | | | - Jacob Hamby
- Department of Orthopedic Surgery, Wake Forest School of Medicine, Winston-Salem, NC, USA
| | | | | | - Xue Ma
- Department of Orthopedic Surgery, Wake Forest School of Medicine, Winston-Salem, NC, USA
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Zhou J, Wang Q. Daphnoretin relieves IL-1β-mediated chondrocytes apoptosis via repressing endoplasmic reticulum stress and NLRP3 inflammasome. J Orthop Surg Res 2022; 17:487. [PMID: 36384642 PMCID: PMC9670399 DOI: 10.1186/s13018-022-03316-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/21/2021] [Accepted: 09/07/2022] [Indexed: 11/17/2022] Open
Abstract
Background Osteoarthritis (OA), mainly caused by severe joint degeneration, is often accompanied by joint pain and dysfunction syndrome. Inflammatory mediators and apoptosis play key roles in the evolution of OA. It is reported that daphnoretin has significant antiviral and anti-tumor values. The present study aims at investigating the role of daphnoretin in OA. Methods The OA mouse model was constructed by performing the destabilization of the medial meniscus through surgery, and the OA cell model was induced in ATDC5 chondrocytes with IL-1β (10 ng/mL) in vitro. Chondrocyte viability and apoptosis were measured by 3-(4,5)-dimethylthiahiazo (-z-y1)-3,5-di-phenytetrazoliumromide (MTT), Caspase-3 activity, and flow cytometry. The levels of COX-2, iNOS, TNF-α, IL-6, Bax, Bcl2, cleaved-Caspase3, endoplasmic reticulum stress (ERS) proteins (GRP78, CHOP, ATF6, and Caspase-12), and NLRP3-ASC-Caspase1 inflammasome were determined by quantitative real-time PCR or western blot. The concentrations of TNF-α, IL-6, and PGE2 were tested by enzyme-linked immunosorbent assay. The content of nitrates was detected by the Griess method. In vivo, morphologic differences in knee joint sections and the thickness of the subchondral bone density plate in mice were observed by hematoxylin–eosin (H&E) staining and safranin O-fast green staining. Results Daphnoretin effectively choked IL-1β-induced chondrocyte apoptosis and facilitated cell viability. Daphnoretin dose-dependently abated ERS, inflammatory mediators, and the activation of NLRP3 inflammasomes in IL-1β-induced chondrocytes. What’s more, in vivo experiments confirmed that daphnoretin alleviated OA progression in a murine OA model by mitigating inflammation and ERS. Conclusion Daphnoretin alleviated IL-1β-induced chondrocyte apoptosis by hindering ERS and NLRP3 inflammasome. Graphical abstract ![]()
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Dreier R, Ising T, Ramroth M, Rellmann Y. Estradiol Inhibits ER Stress-Induced Apoptosis in Chondrocytes and Contributes to a Reduced Osteoarthritic Cartilage Degeneration in Female Mice. Front Cell Dev Biol 2022; 10:913118. [PMID: 35669511 PMCID: PMC9163336 DOI: 10.3389/fcell.2022.913118] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2022] [Accepted: 05/03/2022] [Indexed: 01/29/2023] Open
Abstract
Gender differences are a common finding in osteoarthritis (OA). This may result from a differential response of males and females to endoplasmic reticulum (ER) stress in articular chondrocytes. We have previously described that ER stress in cartilage-specific ERp57 KO mice (ERp57 cKO) favors the development of knee OA, since this stress condition cannot be adequately compensated in articular chondrocytes with increasing age leading to the induction of apoptotic cell death and subsequent cartilage degeneration. The aim of this study was to enlighten gender-specific differences in ER stress, apoptosis, and OA development in ERp57 cKO mice. The analyses were extended by in vitro studies on the influence of estradiol in CRISPR/Cas9-generated C28/I2 ERp57 knock out (KO) and WT cells. ER stress was evaluated by immunofluorescence analysis of the ER stress markers calnexin (Cnx) and binding-immunoglobulin protein (BiP), also referred to as glucose-regulating protein 78 (GRP78) in vivo and in vitro. Apoptotic cell death was investigated by a commercially available cell death detection ELISA and TUNEL assay. OA development in mice was analyzed by toluidine blue staining of paraffin-embedded knee cartilage sections and quantified by OARSI-Scoring. Cell culture studies exhibited a reduction of ER stress and ER stress-induced apoptosis in C28/I2 cells in presence of physiological estradiol concentrations. This is consistent with a slower increase in age-related ER stress and a reduced number of apoptotic chondrocytes in female mice compared to male littermates contributing to a reduced osteoarthritic cartilage degeneration in female mice. Taken together, this study demonstrates that the female sex hormone estradiol can reduce ER stress and ER stress-induced apoptosis in articular chondrocytes, thus minimizing critical events favoring osteoarthritic cartilage degeneration. Therefore, the inhibition of ER stress through a modulation of effects induced by female sex hormones appears to be attractive for OA therapy.
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USP7 Attenuates Endoplasmic Reticulum Stress and NF-κB Signaling to Modulate Chondrocyte Proliferation, Apoptosis, and Inflammatory Response under Inflammation. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2022; 2022:1835900. [PMID: 35432716 PMCID: PMC9007692 DOI: 10.1155/2022/1835900] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Revised: 01/05/2022] [Accepted: 03/09/2022] [Indexed: 11/17/2022]
Abstract
The purpose of this research was to observe the functions and mechanisms of ubiquitin-specific peptidase 7 (USP7) on chondrocytes under tumor necrosis factor alpha- (TNF-α-) induced inflammation. Knee osteoarthritis (OA) models of mice were constructed by anterior cruciate ligament transection. The knee joint of mice was observed by histological staining, and the expression of USP7 was measured by immunohistochemistry staining. After knocking down or inhibiting USP7, chondrocyte proliferation was measured by histological staining and the CCK-8 assay; apoptosis was measured by western blot, flow cytometry, Caspase-3 activity, and TUNEL staining; and inflammatory response was measured by qRT-PCR and ELISA. The 4-phenylbutyric acid (4-PBA), siRNA of CHOP (si-CHOP), and QNZ were used to verify the signaling pathways. It was found that USP7 was reduced in the knee joint cartilage of OA mice. The knockdown of USP7 or its inhibitor decreased chondrocyte proliferation and accelerated apoptosis and inflammatory response under inflammation. The USP7 inhibitor exacerbated cartilage destruction in mice with OA. The knockdown of USP7 or its inhibitor activated the BiP-eIF2α-ATF4-CHOP signaling of endoplasmic reticulum stress (ERS) and NF-κB/p65 signaling. 4-PBA, si-CHOP, and QNZ partly reversed chondrocyte proliferation, apoptosis, and inflammatory response caused by USP7 knockdown. In conclusion, through inhibiting the BiP-eIF2α-ATF4-CHOP signaling of ERS and NF-κB/p65 signaling, USP7 promotes chondrocyte proliferation and suppresses the apoptosis and inflammatory response under TNF-α-induced inflammation.
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Effects of cyclooxygenase and soluble epoxide hydrolase inhibitors on apoptosis of cultured primary equine chondrocytes. Res Vet Sci 2022; 147:44-49. [DOI: 10.1016/j.rvsc.2022.04.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2021] [Revised: 02/24/2022] [Accepted: 04/08/2022] [Indexed: 11/19/2022]
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Wang Y, Xu X, Marshall JE, Gong M, Zhao Y, Dua K, Hansbro PM, Xu J, Liu G. Loss of Hyaluronan and Proteoglycan Link Protein-1 Induces Tumorigenesis in Colorectal Cancer. Front Oncol 2021; 11:754240. [PMID: 34966673 PMCID: PMC8710468 DOI: 10.3389/fonc.2021.754240] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2021] [Accepted: 11/08/2021] [Indexed: 01/10/2023] Open
Abstract
Colorectal cancer (CRC) is the third most common diagnosed cancer worldwide, but there are no effective cures for it. Hyaluronan and proteoglycan link protein-1 (HAPLN1) is a component of the extracellular matrix (ECM) proteins and involved in the tumor environment in the colon. Transforming growth factor (TGF)-β is a key cytokine that regulates the deposition of ECM proteins in CRC. However, the role of HAPLN1 in TGF-β contributions to CRC remains unknown. We found that the mRNA expression of HAPLN1 was decreased in tumors from CRC patients compared with healthy controls and normal tissue adjacent to the tumor using two existing microarray datasets. This was validated at the protein level by tissue array from CRC patients (n = 59). HAPLN1 protein levels were also reduced in human CRC epithelial cells after 24 h of TGF-β stimulation, and its protein expression correlated with type I collagen alpha-1 (COL1A1) in CRC. Transfection of HAPLN1 overexpression plasmids into these cells increased protein levels but reduced COL1A1 protein, tumor growth, and cancer cell migration. TGF-β stimulation increased Smad2/3, p-Smad2/3, Smad4, and E-adhesion proteins; however, HAPLN1 overexpression restored these proteins to baseline levels in CRC epithelial cells after TGF-β stimulation. These findings suggest that HAPLN1 regulates the TGF-β signaling pathway to control collagen deposition via the TGF-β signaling pathway and mediates E-adhesion to control tumor growth. Thus, treatments that increase HAPLN1 levels may be a novel therapeutic option for CRC.
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Affiliation(s)
- Yao Wang
- College of Biology and Food Engineering, Anyang Institute of Technology, Anyang, China.,Hangzhou Xunyao Biotechnology Pty. Ltd., Hangzhou, China
| | - Xiaoyue Xu
- School of Population Health, University of New South Wales, Sydney, NSW, Australia
| | - Jacqueline E Marshall
- Centre for Inflammation, Centenary Institute, Sydney, NSW, Australia.,School of Life Sciences, Faculty of Science, University of Technology, Sydney, NSW, Australia
| | - Muxue Gong
- School of Clinical Medicine, Bengbu Medicine College, Bengbu, China
| | - Yang Zhao
- Department of Biochemistry and Molecular Biology, School of Medicine, Nanjing University of Chinese Medicine, Nanjing, China
| | - Kamal Dua
- Centre for Inflammation, Centenary Institute, Sydney, NSW, Australia.,Discipline of Pharmacy, Graduate School of Health, University of Technology Sydney, Sydney, NSW, Australia
| | - Philip M Hansbro
- Centre for Inflammation, Centenary Institute, Sydney, NSW, Australia.,School of Life Sciences, Faculty of Science, University of Technology, Sydney, NSW, Australia
| | - Jincheng Xu
- Stomatology Department, The First Affiliated Hospital of Bengbu Medical College, Bengbu, China.,School of Dental Medicine, Bengbu Medical College, Bengbu, China
| | - Gang Liu
- Centre for Inflammation, Centenary Institute, Sydney, NSW, Australia.,School of Life Sciences, Faculty of Science, University of Technology, Sydney, NSW, Australia
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Lee CH, Chiang CF, Kuo FC, Su SC, Huang CL, Liu JS, Lu CH, Hsieh CH, Wang CC, Lee CH, Shen PH. High-Molecular-Weight Hyaluronic Acid Inhibits IL-1β-Induced Synovial Inflammation and Macrophage Polarization through the GRP78-NF-κB Signaling Pathway. Int J Mol Sci 2021; 22:ijms222111917. [PMID: 34769349 PMCID: PMC8584972 DOI: 10.3390/ijms222111917] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2021] [Revised: 10/28/2021] [Accepted: 11/01/2021] [Indexed: 12/13/2022] Open
Abstract
Recent evidence has suggested that synovial inflammation and macrophage polarization were involved in the pathogenesis of osteoarthritis (OA). Additionally, high-molecular-weight hyaluronic acid (HMW-HA) was often used clinically to treat OA. GRP78, an endoplasmic reticulum (ER) stress chaperone, was suggested to contribute to the hyperplasia of synovial cells in OA. However, it was still unclear whether HMW-HA affected macrophage polarization through GRP78. Therefore, we aimed to identify the effect of HMW-HA in primary synovial cells and macrophage polarization and to investigate the role of GRP78 signaling. We used IL-1β to treat primary synoviocytes to mimic OA, and then treated them with HMW-HA. We also collected conditioned medium (CM) to culture THP-1 macrophages and examine the changes in the phenotype. IL-1β increased the expression of GRP78, NF-κB (p65 phosphorylation), IL-6, and PGE2 in primary synoviocytes, accompanied by an increased macrophage M1/M2 polarization. GRP78 knockdown significantly reversed the expression of IL-1β-induced GRP78-related downstream molecules and macrophage polarization. HMW-HA with GRP78 knockdown had additive effects in an IL-1β culture. Finally, the synovial fluid from OA patients revealed significantly decreased IL-6 and PGE2 levels after the HMW-HA treatment. Our study elucidated a new form of signal transduction for HMW-HA-mediated protection against synovial inflammation and macrophage polarization and highlighted the involvement of the GRP78-NF-κB signaling pathway.
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Affiliation(s)
- Chien-Hsing Lee
- National Defense Medical Center, Division of Endocrinology and Metabolism, Tri-Service General Hospital, Taipei 114, Taiwan; (C.-H.L.); (F.-C.K.); (S.-C.S.); (C.-L.H.); (J.-S.L.); (C.-H.L.); (C.-H.H.)
| | - Chi-Fu Chiang
- National Defense Medical Center, School of Dentistry, Taipei 114, Taiwan;
| | - Feng-Chih Kuo
- National Defense Medical Center, Division of Endocrinology and Metabolism, Tri-Service General Hospital, Taipei 114, Taiwan; (C.-H.L.); (F.-C.K.); (S.-C.S.); (C.-L.H.); (J.-S.L.); (C.-H.L.); (C.-H.H.)
| | - Sheng-Chiang Su
- National Defense Medical Center, Division of Endocrinology and Metabolism, Tri-Service General Hospital, Taipei 114, Taiwan; (C.-H.L.); (F.-C.K.); (S.-C.S.); (C.-L.H.); (J.-S.L.); (C.-H.L.); (C.-H.H.)
| | - Chia-Luen Huang
- National Defense Medical Center, Division of Endocrinology and Metabolism, Tri-Service General Hospital, Taipei 114, Taiwan; (C.-H.L.); (F.-C.K.); (S.-C.S.); (C.-L.H.); (J.-S.L.); (C.-H.L.); (C.-H.H.)
| | - Jhih-Syuan Liu
- National Defense Medical Center, Division of Endocrinology and Metabolism, Tri-Service General Hospital, Taipei 114, Taiwan; (C.-H.L.); (F.-C.K.); (S.-C.S.); (C.-L.H.); (J.-S.L.); (C.-H.L.); (C.-H.H.)
| | - Chieh-Hua Lu
- National Defense Medical Center, Division of Endocrinology and Metabolism, Tri-Service General Hospital, Taipei 114, Taiwan; (C.-H.L.); (F.-C.K.); (S.-C.S.); (C.-L.H.); (J.-S.L.); (C.-H.L.); (C.-H.H.)
| | - Chang-Hsun Hsieh
- National Defense Medical Center, Division of Endocrinology and Metabolism, Tri-Service General Hospital, Taipei 114, Taiwan; (C.-H.L.); (F.-C.K.); (S.-C.S.); (C.-L.H.); (J.-S.L.); (C.-H.L.); (C.-H.H.)
| | - Chih-Chien Wang
- National Defense Medical Center, Department of Orthopedics, Tri-Service General Hospital, Taipei 114, Taiwan;
| | - Chian-Her Lee
- Department of Orthopedics, Taipei Medical University, Taipei 110, Taiwan;
| | - Pei-Hung Shen
- National Defense Medical Center, Department of Orthopedics, Tri-Service General Hospital, Taipei 114, Taiwan;
- Correspondence:
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Liu YN, Mu YD, Wang H, Zhang M, Shi YW, Mi G, Peng LX, Chen JH. Endoplasmic reticulum stress pathway mediates T-2 toxin-induced chondrocyte apoptosis. Toxicology 2021; 464:152989. [PMID: 34673134 DOI: 10.1016/j.tox.2021.152989] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2021] [Revised: 09/11/2021] [Accepted: 10/12/2021] [Indexed: 12/25/2022]
Abstract
T-2 toxin leads to chondrocyte apoptosis and excessive extracellular matrix degradation. The aim of this study is to investigate if endoplasmic reticulum stress (ERS) - initiated apoptosis is involved in the chondrocyte damage induced by T-2 toxin. In vivo, rats were divided into a control group, T-2 toxin 200 ng/g BW/d group, the protein levels of GRP78, CHOP, and caspase-12 were detected using immunohistochemistry in articular cartilage tissues. In vitro, C28/I2 and ATDC5 chondrocytes were treated with various concentrations of T-2 toxin. For the salubrinal protection assay, cells were pretreated with 20 μM salubrinal for 1 h, and treated with and without T-2 toxin for 24 h. The cell viability was determined using the MTT assay; and the cell apoptosis was determined using the Flow Cytometry Assay; the mRNA and protein levels of the ERS markers and ECM were determined using RT-PCR and western blotting. This study found that the expressions of GRP78, CHOP, and caspase-12 is higher in T-2 toxin group than in control group both in vivo and in vitro, and the T-2 toxin administration promoted chondrocyte apoptosis, suppressed matrix synthesis, and accelerated cellular catabolism via the ERS signaling pathway. In addition, this study found that salubrinal prevented chondrocyte injury by inhibiting ERS-mediated apoptosis via the PERK-eIF2α-ATF4-CHOP signaling pathway. Collectively, this study provides a new clue to elucidate the mechanism of T-2 toxin-induced chondrocyte damage, and presents a novel therapeutic possibility of salubrinal for Osteoarthropathy such as osteoarthritis (OA) and Kaschin-Beck disease (KBD).
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Affiliation(s)
- Yi-Nan Liu
- School of Public Health, Xi'an Jiaotong University Health Science Center, Key Laboratory of Trace Elements and Endemic Diseases, National Health and Family Planning Commission, No. 76 Yanta West Road, Xi'an, 710061, Shaanxi, People's Republic of China.
| | - Yu-Dong Mu
- Department of Clinical Laboratory, Tumor Hospital of Shaanxi Province, Affiliated to the Medical College of Xi'an Jiaotong University, Xi'an, 710061, Shaanxi, People's Republic of China.
| | - Hui Wang
- School of Public Health, Xi'an Jiaotong University Health Science Center, Key Laboratory of Trace Elements and Endemic Diseases, National Health and Family Planning Commission, No. 76 Yanta West Road, Xi'an, 710061, Shaanxi, People's Republic of China.
| | - Meng Zhang
- School of Public Health, Xi'an Jiaotong University Health Science Center, Key Laboratory of Trace Elements and Endemic Diseases, National Health and Family Planning Commission, No. 76 Yanta West Road, Xi'an, 710061, Shaanxi, People's Republic of China.
| | - Ya-Wen Shi
- School of Public Health, Xi'an Jiaotong University Health Science Center, Key Laboratory of Trace Elements and Endemic Diseases, National Health and Family Planning Commission, No. 76 Yanta West Road, Xi'an, 710061, Shaanxi, People's Republic of China.
| | - Ge Mi
- School of Public Health, Xi'an Jiaotong University Health Science Center, Key Laboratory of Trace Elements and Endemic Diseases, National Health and Family Planning Commission, No. 76 Yanta West Road, Xi'an, 710061, Shaanxi, People's Republic of China.
| | - Lei-Xuan Peng
- School of Public Health, Xi'an Jiaotong University Health Science Center, Key Laboratory of Trace Elements and Endemic Diseases, National Health and Family Planning Commission, No. 76 Yanta West Road, Xi'an, 710061, Shaanxi, People's Republic of China.
| | - Jing-Hong Chen
- School of Public Health, Xi'an Jiaotong University Health Science Center, Key Laboratory of Trace Elements and Endemic Diseases, National Health and Family Planning Commission, No. 76 Yanta West Road, Xi'an, 710061, Shaanxi, People's Republic of China.
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Tan Q, Jiang A, Li W, Song C, Leng H. Metabolic syndrome and osteoarthritis: Possible mechanisms and management strategies. MEDICINE IN NOVEL TECHNOLOGY AND DEVICES 2021. [DOI: 10.1016/j.medntd.2020.100052] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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12
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Molecular and Cellular Effects of Chemical Chaperone-TUDCA on ER-Stressed NHAC-kn Human Articular Chondrocytes Cultured in Normoxic and Hypoxic Conditions. Molecules 2021; 26:molecules26040878. [PMID: 33562298 PMCID: PMC7915106 DOI: 10.3390/molecules26040878] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2020] [Revised: 02/01/2021] [Accepted: 02/05/2021] [Indexed: 12/28/2022] Open
Abstract
Osteoarthritis (OA) is considered one of the most common arthritic diseases characterized by progressive degradation and abnormal remodeling of articular cartilage. Potential therapeutics for OA aim at restoring proper chondrocyte functioning and inhibiting apoptosis. Previous studies have demonstrated that tauroursodeoxycholic acid (TUDCA) showed anti-inflammatory and anti-apoptotic activity in many models of various diseases, acting mainly via alleviation of endoplasmic reticulum (ER) stress. However, little is known about cytoprotective effects of TUDCA on chondrocyte cells. The present study was designed to evaluate potential effects of TUDCA on interleukin-1β (IL-1β) and tunicamycin (TNC)-stimulated NHAC-kn chondrocytes cultured in normoxic and hypoxic conditions. Our results showed that TUDCA alleviated ER stress in TNC-treated chondrocytes, as demonstrated by reduced CHOP expression; however, it was not effective enough to prevent apoptosis of NHAC-kn cells in either normoxia nor hypoxia. However, co-treatment with TUDCA alleviated inflammatory response induced by IL-1β, as shown by down regulation of Il-1β, Il-6, Il-8 and Cox2, and increased the expression of antioxidant enzyme Sod2. Additionally, TUDCA enhanced Col IIα expression in IL-1β- and TNC-stimulated cells, but only in normoxic conditions. Altogether, these results suggest that although TUDCA may display chondoprotective potential in ER-stressed cells, further analyses are still necessary to fully confirm its possible recommendation as potential candidate in OA therapy.
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Gong L, Liu G, Zhu H, Li C, Li P, Liu C, Tang H, Wu K, Wu J, Liu D, Tang X. IL-32 induces epithelial-mesenchymal transition by triggering endoplasmic reticulum stress in A549 cells. BMC Pulm Med 2020; 20:278. [PMID: 33097029 PMCID: PMC7585222 DOI: 10.1186/s12890-020-01319-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2020] [Accepted: 10/18/2020] [Indexed: 12/22/2022] Open
Abstract
Background Epithelial-mesenchymal transition (EMT) is a key process in the onset and development of idiopathic pulmonary fibrosis (IPF) with unclear mechanisms. Our previous studies found that bleomycin and tunicamycin could induce ER stress and consequently trigger EMT accompanying with IL-32 overexpression. This study was aimed to investigate the effects of IL-32 on EMT and ER stress to elucidate the pathogenesis of IPF. Methods Human lung adenocarcinoma A549 cells were treated with recombinant human (rh)IL-32, IL-32 siRNA and EMT inducer tunicamycin, or 4-phenylbutyric acid (4-PBA), respectively. Then the cell morphology was observed and the expression of ER-related markers and EMT-related markers were detected by RT-qPCR or western blotting. Results Stimulation of A549 cells with rhIL-32 led to a morphological change from a pebble-like shape to an elongated shape in a portion of the cells, accompanied by down regulated expression of the epithelial cell marker E-cadherin and up regulated expression of the mesenchymal cell markers N-cadherin, Vimentin, and Zeb-1. However, these rhIL-32 induced changes were inhibited by the ER stress inhibitor 4-PBA. Suppression of IL-32 expression with siRNA inhibited TM-induced EMT. Further stimulation of the A549 cells with rhIL-32 demonstrated an increase in the expression of GRP78, although this increase was also inhibited by 4-PBA. Conclusions These results suggest that IL-32 induces EMT in A549 cells by triggering ER stress, and IL-32 may be a novel marker for IPF. Supplementary information Supplementary information accompanies this paper at 10.1186/s12890-020-01319-z.
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Affiliation(s)
- Ling Gong
- The First Clinical Medical College, Jinan University, 601 W. Huangpu Avenue, Guangzhou, 510630, China.,Department of Respiratory Medicine, The Third Affiliated Hospital of Zunyi Medical University (The First People's Hospital of Zunyi), Zunyi, 563000, Guizhou, China
| | - Gang Liu
- Department of Respiratory Medicine, The Third Affiliated Hospital of Zunyi Medical University (The First People's Hospital of Zunyi), Zunyi, 563000, Guizhou, China.,Institute of Respiratory Diseases, The Second Affiliated Hospital of Army Medical University (Third Military Medical University), Chongqing, 400037, China
| | - Honglan Zhu
- Department of Respiratory Medicine, The Third Affiliated Hospital of Zunyi Medical University (The First People's Hospital of Zunyi), Zunyi, 563000, Guizhou, China
| | - Caihong Li
- Zunyi Medical University, Zunyi, 563000, Guizhou, China
| | - Pengmei Li
- Zunyi Medical University, Zunyi, 563000, Guizhou, China
| | - Changlu Liu
- Zunyi Medical University, Zunyi, 563000, Guizhou, China
| | - Hongbo Tang
- Department of Respiratory Medicine, The Third Affiliated Hospital of Zunyi Medical University (The First People's Hospital of Zunyi), Zunyi, 563000, Guizhou, China
| | - Kaifeng Wu
- Department of Respiratory Medicine, The Third Affiliated Hospital of Zunyi Medical University (The First People's Hospital of Zunyi), Zunyi, 563000, Guizhou, China.,Scientific Research Center, The Third Affiliated Hospital of Zunyi Medical University (The First People's Hospital of Zunyi), Zunyi, 563000, Guizhou, China
| | - Jie Wu
- Department of Respiratory Medicine, The Third Affiliated Hospital of Zunyi Medical University (The First People's Hospital of Zunyi), Zunyi, 563000, Guizhou, China.,Scientific Research Center, The Third Affiliated Hospital of Zunyi Medical University (The First People's Hospital of Zunyi), Zunyi, 563000, Guizhou, China
| | - Daishun Liu
- Department of Respiratory Medicine, The Third Affiliated Hospital of Zunyi Medical University (The First People's Hospital of Zunyi), Zunyi, 563000, Guizhou, China. .,Department of Respiratory, The Third Affiliated Hospital of Zunyi Medical University (The First People's Hospital of Zunyi), No.98 Fenghuang Road, Zunyi, 563002, Guizhou, China.
| | - Xiaoping Tang
- The First Clinical Medical College, Jinan University, 601 W. Huangpu Avenue, Guangzhou, 510630, China.
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Advanced Glycation End Products (AGEs): Biochemistry, Signaling, Analytical Methods, and Epigenetic Effects. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2020; 2020:3818196. [PMID: 32256950 PMCID: PMC7104326 DOI: 10.1155/2020/3818196] [Citation(s) in RCA: 199] [Impact Index Per Article: 49.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/04/2019] [Revised: 01/13/2020] [Accepted: 01/24/2020] [Indexed: 02/08/2023]
Abstract
The advanced glycation end products (AGEs) are organic molecules formed in any living organisms with a great variety of structural and functional properties. They are considered organic markers of the glycation process. Due to their great heterogeneity, there is no specific test for their operational measurement. In this review, we have updated the most common chromatographic, colorimetric, spectroscopic, mass spectrometric, and serological methods, typically used for the determination of AGEs in biological samples. We have described their signaling and signal transduction mechanisms and cell epigenetic effects. Although mass spectrometric analysis is not widespread in the detection of AGEs at the clinical level, this technique is highly promising for the early diagnosis and therapeutics of diseases caused by AGEs. Protocols are available for high-resolution mass spectrometry of glycated proteins although they are characterized by complex machine management. Simpler procedures are available although much less precise than mass spectrometry. Among them, immunochemical tests are very common since they are able to detect AGEs in a simple and immediate way. In these years, new methodologies have been developed using an in vivo novel and noninvasive spectroscopic methods. These methods are based on the measurement of autofluorescence of AGEs. Another method consists of detecting AGEs in the human skin to detect chronic exposure, without the inconvenience of invasive methods. The aim of this review is to compare the different approaches of measuring AGEs at a clinical perspective due to their strict association with oxidative stress and inflammation.
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15
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Ulianich L, Mirra P, Garbi C, Calì G, Conza D, Treglia AS, Miraglia A, Punzi D, Miele C, Raciti GA, Beguinot F, Consiglio E, Di Jeso B. The Pervasive Effects of ER Stress on a Typical Endocrine Cell: Dedifferentiation, Mesenchymal Shift and Antioxidant Response in the Thyrocyte. Front Endocrinol (Lausanne) 2020; 11:588685. [PMID: 33240221 PMCID: PMC7680880 DOI: 10.3389/fendo.2020.588685] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/29/2020] [Accepted: 10/09/2020] [Indexed: 01/01/2023] Open
Abstract
The endoplasmic reticulum stress and the unfolded protein response are triggered following an imbalance between protein load and protein folding. Until recently, two possible outcomes of the unfolded protein response have been considered: life or death. We sought to substantiate a third alternative, dedifferentiation, mesenchymal shift, and activation of the antioxidant response by using typical endocrine cells, i.e. thyroid cells. The thyroid is a unique system both of endoplasmic reticulum stress (a single protein, thyroglobulin represents the majority of proteins synthesized in the endoplasmic reticulum by the thyrocyte) and of polarized epithelium (the single layer of thyrocytes delimiting the follicle). Following endoplasmic reticulum stress, in thyroid cells the folding of thyroglobulin was disrupted. The mRNAs of unfolded protein response were induced or spliced (X-box binding protein-1). Differentiation was inhibited: mRNA levels of thyroid specific genes, and of thyroid transcription factors were dramatically downregulated, at least in part, transcriptionally. The dedifferentiating response was accompanied by an upregulation of mRNAs of antioxidant genes. Moreover, cadherin-1, and the thyroid (and kidney)-specific cadherin-16 mRNAs were downregulated, vimentin, and SNAI1 mRNAs were upregulated. In addition, loss of cortical actin and stress fibers formation were observed. Together, these data indicate that ER stress in thyroid cells induces dedifferentiation, loss of epithelial organization, shift towards a mesenchymal phenotype, and activation of the antioxidant response, highlighting, at the same time, a new and wide strategy to achieve survival following ER stress, and, as a sort of the other side of the coin, a possible new molecular mechanism of decline/loss of function leading to a deficit of thyroid hormones formation.
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Affiliation(s)
- Luca Ulianich
- Dipartimento di Scienze Mediche e Traslazionali Universita’ “Federico II” & URT dell’Istituto di Endocrinologia e Oncologia Sperimentale “Gaetano Salvatore,” Consiglio Nazionale delle Ricerche (CNR), Napoli, Italy
| | - Paola Mirra
- Dipartimento di Scienze Mediche e Traslazionali Universita’ “Federico II” & URT dell’Istituto di Endocrinologia e Oncologia Sperimentale “Gaetano Salvatore,” Consiglio Nazionale delle Ricerche (CNR), Napoli, Italy
| | - Corrado Garbi
- Dipartimento di Medicina Molecolare e Biotecnologie Mediche, Napoli, Italy
| | - Gaetano Calì
- Istituto di Endocrinologia ed Oncologia Sperimentale “G. Salvatore,” CNR, Napoli, Italy
| | - Domenico Conza
- Dipartimento di Scienze Mediche e Traslazionali Universita’ “Federico II” & URT dell’Istituto di Endocrinologia e Oncologia Sperimentale “Gaetano Salvatore,” Consiglio Nazionale delle Ricerche (CNR), Napoli, Italy
| | - Antonella Sonia Treglia
- Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali, Università del Salento, Lecce, Italy
| | - Alessandro Miraglia
- Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali, Università del Salento, Lecce, Italy
| | - Dario Punzi
- Dipartimento di Scienze Mediche e Traslazionali Universita’ “Federico II” & URT dell’Istituto di Endocrinologia e Oncologia Sperimentale “Gaetano Salvatore,” Consiglio Nazionale delle Ricerche (CNR), Napoli, Italy
| | - Claudia Miele
- Dipartimento di Scienze Mediche e Traslazionali Universita’ “Federico II” & URT dell’Istituto di Endocrinologia e Oncologia Sperimentale “Gaetano Salvatore,” Consiglio Nazionale delle Ricerche (CNR), Napoli, Italy
| | - Gregory Alexander Raciti
- Dipartimento di Scienze Mediche e Traslazionali Universita’ “Federico II” & URT dell’Istituto di Endocrinologia e Oncologia Sperimentale “Gaetano Salvatore,” Consiglio Nazionale delle Ricerche (CNR), Napoli, Italy
| | - Francesco Beguinot
- Dipartimento di Scienze Mediche e Traslazionali Universita’ “Federico II” & URT dell’Istituto di Endocrinologia e Oncologia Sperimentale “Gaetano Salvatore,” Consiglio Nazionale delle Ricerche (CNR), Napoli, Italy
| | - Eduardo Consiglio
- Dipartimento di Scienze Mediche e Traslazionali Universita’ “Federico II” & URT dell’Istituto di Endocrinologia e Oncologia Sperimentale “Gaetano Salvatore,” Consiglio Nazionale delle Ricerche (CNR), Napoli, Italy
| | - Bruno Di Jeso
- Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali, Università del Salento, Lecce, Italy
- *Correspondence: Bruno Di Jeso, , orcid.org/0000-0001-8713-5984
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Lin M, Yuan W, Su Z, Lin C, Huang T, Chen Y, Wang J. Yes-associated protein mediates angiotensin II-induced vascular smooth muscle cell phenotypic modulation and hypertensive vascular remodelling. Cell Prolif 2018; 51:e12517. [PMID: 30156340 DOI: 10.1111/cpr.12517] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2018] [Revised: 06/22/2018] [Accepted: 07/17/2018] [Indexed: 12/19/2022] Open
Abstract
OBJECTIVES Yes-associated protein (YAP) has been reported to regulate cell proliferation and differentiation. We aimed to characterize the role of YAP in angiotensin II (Ang II)-induced hypertensive vascular remodelling (HVR) and vascular smooth muscle cells (VSMCs) phenotypic modulation and to explore the underlying mechanisms. MATERIALS AND METHODS An HVR rat model was established by continuous Ang II infusion for 2 weeks. Western blotting, qRT-PCR, and confocal microscopy were conducted to assess YAP expression. YAP-shRNA interfering plasmid and adenovirus were constructed to knock down YAP. We used cell proliferation and migration assays, accompanied by pathway inhibitors, to evaluate the biological function and underlying mechanisms. RESULTS Ang II upregulated YAP expression in the media of carotid artery; however, in vivo YAP silencing significantly mitigated HVR, independent of the blood pressure level. Ang II upregulated YAP expression and promoted YAP nuclear accumulation in a dose- and time-dependent manner in rat VSMCs. YAP knockdown ameliorated Ang II-induced VSMCs phenotypic modulation. The regulation of YAP by Ang II could be blocked by pretreatment with angiotensin receptor type 1 antagonist losartan or F-actin depolymerizing agent latrunculin B but not the AT2R antagonist PD 123319. Disrupting the YAP-TEA domain (TEAD) interaction with verteporfin inhibited Ang II-induced VSMCs phenotypic modulation. CONCLUSIONS Yes-associated protein mediated angiotensin II-induced VSMCs phenotypic modulation and vascular remodelling. YAP is a potential therapeutic target for HVR beyond blood pressure control.
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Affiliation(s)
- Maohuan Lin
- Department of Cardiology, Sun Yat-Sen Memorial Hospital of Sun Yat-Sen University, Guangzhou, China.,Guangdong Province Key Laboratory of Arrhythmia and Electrophysiology, Guangzhou, China
| | - Woliang Yuan
- Department of Cardiology, Sun Yat-Sen Memorial Hospital of Sun Yat-Sen University, Guangzhou, China.,Guangdong Province Key Laboratory of Arrhythmia and Electrophysiology, Guangzhou, China
| | - Zizhuo Su
- Department of Cardiology, Sun Yat-Sen Memorial Hospital of Sun Yat-Sen University, Guangzhou, China.,Guangdong Province Key Laboratory of Arrhythmia and Electrophysiology, Guangzhou, China
| | - Caina Lin
- Department of Rehabilitation Medicine, Sun Yat-Sen Memorial Hospital of Sun Yat-Sen University, Guangzhou, China
| | - Tucheng Huang
- Department of Cardiology, Sun Yat-Sen Memorial Hospital of Sun Yat-Sen University, Guangzhou, China.,Guangdong Province Key Laboratory of Arrhythmia and Electrophysiology, Guangzhou, China
| | - Yangxin Chen
- Department of Cardiology, Sun Yat-Sen Memorial Hospital of Sun Yat-Sen University, Guangzhou, China.,Guangdong Province Key Laboratory of Arrhythmia and Electrophysiology, Guangzhou, China
| | - Jingfeng Wang
- Department of Cardiology, Sun Yat-Sen Memorial Hospital of Sun Yat-Sen University, Guangzhou, China.,Guangdong Province Key Laboratory of Arrhythmia and Electrophysiology, Guangzhou, China
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17
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Xu T, Gu Z, Wu H, Yao H, Wang G. Expression of endoplasmic reticulum stress protein in rabbit condyle cartilage following anterior disk displacement. J Oral Pathol Med 2018; 47:606-612. [PMID: 29663508 DOI: 10.1111/jop.12715] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/05/2018] [Indexed: 12/19/2022]
Abstract
OBJECTIVE Anterior disk displacement (ADD) is a most common subtype of temporomandibular disorders (TMD), which is promoted by chondrocytes apoptosis. However, the signaling pathways that trigger apoptosis are still unknown. The aim of this study was to investigate the expression of endoplasmic reticulum (ER) stress-related proteins in the condylar cartilage of rabbits following ADD. METHODS Sixty healthy adult rabbits were randomly assigned to the experimental and sham-operated control groups (n = 12). The experimental rabbits were subjected to surgical ADD in the right temporomandibular joints. The production of ER stress-related proteins C/EBP homologous protein (CHOP), glucose-regulated protein 78 (GRP78), cleaved caspase-3, and caspase-12 in cartilage was evaluated by immunohistochemistry, quantitative real-time PCR, and Western blot analysis. RESULTS Our results showed that the expression of CHOP, GRP78, cleaved caspase-3, and caspase-12 increased significantly along with degenerative changes in cartilage after ADD. CONCLUSION These results indicate that the ER stress pathway is activated in ADD cartilage and might promote the development of TMD.
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Affiliation(s)
- Ting Xu
- Department of Stomatology, First Affiliated Hospital, Zhejiang University, Hangzhou, Zhejiang, China.,School of Stomatology, Zhejiang University, Hangzhou, Zhejiang, China
| | - Zhiyuan Gu
- School of Stomatology, Zhejiang Chinese Medical University, Hangzhou, Zhejiang, China
| | - Huiling Wu
- Department of Plastic and Aesthetic Center, First Affiliated Hospital, Zhejiang University, Hangzhou, Zhejiang, China
| | - Hua Yao
- Department of Stomatology, First Affiliated Hospital, Zhejiang University, Hangzhou, Zhejiang, China.,School of Stomatology, Zhejiang University, Hangzhou, Zhejiang, China
| | - Guohua Wang
- Department of Stomatology, First Affiliated Hospital, Zhejiang University, Hangzhou, Zhejiang, China.,School of Stomatology, Zhejiang University, Hangzhou, Zhejiang, China
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18
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PERK-mediated translational control is required for collagen secretion in chondrocytes. Sci Rep 2018; 8:773. [PMID: 29335505 PMCID: PMC5768675 DOI: 10.1038/s41598-017-19052-9] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2017] [Accepted: 12/20/2017] [Indexed: 12/22/2022] Open
Abstract
As chondrocytes are highly secretory and they experience a variety of stresses, physiological unfolded protein response (UPR) signalling is essential for extracellular matrix (ECM) secretion and chondrogenesis. In the three branches of the UPR pathway, PERK governs the translational attenuation and transcriptional upregulation of amino acid and redox metabolism and induction of apoptosis. It was previously demonstrated that a defect of the PERK branch of the UPR signalling pathway causes the accumulation of unfolded proteins, leading to cell death without perturbing endoplasmic reticulum (ER)-to-Golgi transport in pancreatic β cells. However, little is known about the role of PERK in chondrocytes. In this study, we found that PERK signalling is activated in chondrocytes, and inhibition of PERK reduces collagen secretion despite causing excessive collagen synthesis in the ER. Perk−/− mice displayed reduced collagen in articular cartilage but no differences in chondrocyte proliferation or apoptosis compared to the findings in wild-type mice. PERK inhibition increases misfolded protein levels in the ER, which largely hinder ER-to-Golgi transport. These results suggest that the translational control mediated by PERK is a critical determinant of ECM secretion in chondrocytes.
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19
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Fontinele RG, Krause Neto W, Gama EF, Brito Mari RD, de Souza RR, Conrado A, Mochizuki L, Kfoury Junior JR. Caloric restriction minimizes aging effects on the femoral medial condyle. Aging Male 2017; 20:161-167. [PMID: 28332902 DOI: 10.1080/13685538.2017.1301418] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
Abstract
This study aimed to analyze the effects of caloric restriction on aged femoral articular cartilage of Wistar rats. Three groups of eight animals each were considered: young (YC) and old (OC) control groups fed with a normal diet and old caloric restriction group (OCR) composed of 18-month-old animals fed with a 31% less caloric diet from 6-months of age. Articular cartilage was studied through morphometry and immunohistochemistry. Body mass was 12% less in the OCR group than in the OC group. The articular cartilage from OC rats show thinner medial condyles, fewer chondrocytes, smaller chondrocytes nuclear volume and, in both condyles, a predominance of collagen type II and less collagen density compared to both YC and OCR groups (p < .001). In contrast, OCR articular cartilage show thicker medial condyles, larger chondrocytes nuclear volume and increased collagen density compared to OC group (p < 0.001). We concluded that caloric restriction minimizes the effects of aging on medial condyles of the femoral articular cartilage.
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Affiliation(s)
- Renata Gabriel Fontinele
- a Department of Surgery, Faculty of Veterinary Medicine and Zootecny , São Paulo University , São Paulo , Brazil
| | - Walter Krause Neto
- b Department of Physical Education, Laboratory of Morphoquantitative Studies and Immunohistochemistry , São Judas Tadeu University , São Paulo , Brazil
| | - Eliane Florencio Gama
- b Department of Physical Education, Laboratory of Morphoquantitative Studies and Immunohistochemistry , São Judas Tadeu University , São Paulo , Brazil
| | - Renata de Brito Mari
- c Department of Morphological Sciences , Maringá State University , Maringá , Brazil
| | - Romeu Rodrigues de Souza
- b Department of Physical Education, Laboratory of Morphoquantitative Studies and Immunohistochemistry , São Judas Tadeu University , São Paulo , Brazil
- d Department of Anatomy , São Judas Tadeu University , São Paulo , Brazil
| | - André Conrado
- a Department of Surgery, Faculty of Veterinary Medicine and Zootecny , São Paulo University , São Paulo , Brazil
| | - Luis Mochizuki
- e School of Arts, Sciences and Humanities , São Paulo University , São Paulo , Brazil
| | - José Roberto Kfoury Junior
- a Department of Surgery, Faculty of Veterinary Medicine and Zootecny , São Paulo University , São Paulo , Brazil
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Inhibitory effect of quercetin on titanium particle-induced endoplasmic reticulum stress (ERS)-related apoptosis and in vivoosteolysis. Biosci Rep 2017; 37:BSR20170961. [PMID: 28760844 PMCID: PMC5634327 DOI: 10.1042/bsr20170961] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2017] [Revised: 07/21/2017] [Accepted: 07/31/2017] [Indexed: 11/23/2022] Open
Abstract
Wear particle induced periprosthetic osteolysis is the main cause of aseptic
loosening of orthopedic implants. The aim of the present study is to determine
the protective effect of quercetin (QUE) against titanium (Ti) particle induced
endoplasmic reticulum stress (ERS) related apoptosis and osteolysis. In the
present study, RAW264.7 cells were pretreated with different concentrations (40,
80, and 160 μmol/l) of QUE for 30 min and then treated with Ti particle
(5 mg/ml) for 24 h. Cell viability and apoptosis were determined using MTT assay
and Annexin V-FITC Apoptosis Detection Kit, respectively. Protein and mRNA
expressions of ERS-related genes were examined by Western blot and real-time
PCR, respectively. The release of inflammatory cytokines was detected by ELISA.
Then, a mouse calvarial osteolysis model was established. Histological sections
of calvaria were stained with Hematoxylin-Eosin (H&E) or
tartrate-resistant acid phosphatase (TRAP). The results showed that Ti particle
reduced cell viability and induced apoptosis in RAW264.7 macrophages. The
cytotoxic effects of Ti particle were dramatically inhibited by QUE
pretreatment. Interestingly, we found that QUE also significantly reduced Ti
particle induced up-regulation of the expression levels of protein kinase
RNA-like ER kinase (PERK), inositol-requiring enzyme-1 (IRE1), glucose-regulated
protein (GRP78), CCAAT/enhancer-binding protein homologous protein (CHOP),
caspase-12, and caspase-3 and enhanced the down-regulation of Bcl-2. In
addition, QUE decreased Ti particle-induced inflammatory cytokines release from
RAW264.7 cells. Moreover, treatment with QUE markedly decreased osteoclast
number. In a mouse calvarial osteolysis model, QUE inhibited Ti particle induced
osteolysis in vivo by inhibiting osteoclast formation and
expressions of ERS-related genes. In conclusion, QUE can protect RAW264.7 cells
from Ti particle induced ERS-related apoptosis and suppress calvarial osteolysis
in vivo.
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21
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Role of endoplasmic reticulum stress pathway in hydrostatic pressure-induced apoptosis in rat mandibular condylar chondrocytes. Mol Cell Biochem 2017; 429:23-31. [DOI: 10.1007/s11010-016-2933-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2016] [Accepted: 12/23/2016] [Indexed: 01/07/2023]
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Hosseinzadeh A, Kamrava SK, Joghataei MT, Darabi R, Shakeri-Zadeh A, Shahriari M, Reiter RJ, Ghaznavi H, Mehrzadi S. Apoptosis signaling pathways in osteoarthritis and possible protective role of melatonin. J Pineal Res 2016; 61:411-425. [PMID: 27555371 DOI: 10.1111/jpi.12362] [Citation(s) in RCA: 240] [Impact Index Per Article: 30.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/19/2016] [Accepted: 08/22/2016] [Indexed: 12/14/2022]
Abstract
Osteoarthritis (OA) is a degenerative joint disease characterized by progressive erosion of articular cartilage. As chondrocytes are the only cell type forming the articular cartilage, their gradual loss is the main cause of OA. There is a substantial body of published research that suggests reactive oxygen species (ROS) are major causative factors for chondrocyte damage and OA development. Oxidative stress elicited by ROS is capable of oxidizing and subsequently disrupting cartilage homeostasis, promoting catabolism via induction of cell death and damaging numerous components of the joint. IL-1β and TNF-α are crucial inflammatory factors that play pivotal roles in the pathogenesis of OA. In this process, the mitochondria are the major source of ROS production in cells, suggesting a role of mitochondrial dysfunction in this type of arthritis. This may also be promoted by inflammatory cytokines such as IL-1β and TNF-α which contribute to chondrocyte death. In patients with OA, the expression of endoplasmic reticulum (ER) stress-associated molecules is positively correlated with cartilage degeneration. Melatonin and its metabolites are broad-spectrum antioxidants and free radical scavengers which regulate a variety of molecular pathways such as inflammation, proliferation, apoptosis, and metastasis in different pathophysiological situations. Herein, we review the effects of melatonin on OA, focusing on its ability to regulate apoptotic processes and ER and mitochondrial activity. We also evaluate likely protective effects of melatonin on OA pathogenesis.
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Affiliation(s)
- Azam Hosseinzadeh
- Department of Pharmacology, School of Medicine, Iran University of Medical Sciences, Tehran, Iran
| | - Seyed Kamran Kamrava
- ENT and Head & Neck Research Center, Hazrate Rasoul Akram Hospital, Iran University of Medical Sciences, Tehran, Iran
| | | | - Radbod Darabi
- Center for Stem Cell and Regenerative Medicine (CSCRM), Brown Foundation Institute of Molecular Medicine (IMM), University of Texas Health Science Center at Houston, Houston, TX, USA
| | - Ali Shakeri-Zadeh
- Medical Physics Department, School of Medicine, Iran University of Medical Sciences, Tehran, Iran
| | - Mansour Shahriari
- Ophthalmology Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Russel J Reiter
- Department of Cellular and Structural Biology, The University of Texas Health Science Center, San Antonio, TX, USA
| | | | - Saeed Mehrzadi
- Department of Pharmacology, School of Medicine, Iran University of Medical Sciences, Tehran, Iran. ,
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Gawron K. Endoplasmic reticulum stress in chondrodysplasias caused by mutations in collagen types II and X. Cell Stress Chaperones 2016; 21:943-958. [PMID: 27523816 PMCID: PMC5083666 DOI: 10.1007/s12192-016-0719-z] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2016] [Revised: 07/01/2016] [Accepted: 07/05/2016] [Indexed: 02/07/2023] Open
Abstract
The endoplasmic reticulum is primarily recognized as the site of synthesis and folding of secreted, membrane-bound, and some organelle-targeted proteins. An imbalance between the load of unfolded proteins and the processing capacity in endoplasmic reticulum leads to the accumulation of unfolded or misfolded proteins and endoplasmic reticulum stress, which is a hallmark of a number of storage diseases, including neurodegenerative diseases, a number of metabolic diseases, and cancer. Moreover, its contribution as a novel mechanistic paradigm in genetic skeletal diseases associated with abnormalities of the growth plates and dwarfism is considered. In this review, I discuss the mechanistic significance of endoplasmic reticulum stress, abnormal folding, and intracellular retention of mutant collagen types II and X in certain variants of skeletal chondrodysplasia.
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Affiliation(s)
- Katarzyna Gawron
- Microbiology Department, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Gronostajowa 7, 30-387, Krakow, Poland.
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Zhang L, Wang L, Wang R, Pan Y, Gao Y, Fu P. Protective effects of GTM-1 on endoplasmic reticulum stress induced by thapsgargin in rat neurons. Biomed Pharmacother 2016; 84:821-827. [PMID: 27723573 DOI: 10.1016/j.biopha.2016.09.050] [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: 05/13/2016] [Revised: 09/07/2016] [Accepted: 09/14/2016] [Indexed: 11/25/2022] Open
Abstract
GTM-1 is a drug that reverses Alzheimer's Disease (AD) development specifically induced by thapsgargin (TG) and endoplasmic reticulum (ER) has been reported to be a pilot process that leads to AD formation. It is speculated that GTM-1 could also prohibit TG-induced ER stress. In this study, we utilized immuno-fluorescence to identify morphological changes in nucleus and transmission electron microscopy was used to observe neuronal ultra-structures. Moreover, expressions of GRP78, CHOP, Bcl-2 and cytochrome c were assessed using immuno-blotting, while calcium concentration was detected by fluorescence spectrometer. As suggested by the above cellular experiments, neuronal ultrastructures were damaged by the treatment of TG, while this damaging trend was reversed when neurons were simultaneously treated with both TG and GTM-1. Besides that, certain marker proteins of ER stress (e.g. GRP78, CHOP, and cytochrome c) and calcium concentrations in neurons were significantly increased when TG was applied, while these levels were reduced to normal conditions when GTM-1 was added in the treatment. In conclusion, GTM-1 restrained the ongoing of ER stress that was induced by TG.
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Affiliation(s)
- Lijuan Zhang
- Department of Pharmacy, Changhai Hospital, Second Military Medical University, Shanghai, 200433, China
| | - Lina Wang
- Department of Traditional Chinese Medicine, Changhai Hospital, Second Military Medical University, Shanghai, 200433, China
| | - Run Wang
- Department of Pharmacy, 85 Hospital of People's Liberation Army, Shanghai, 200433, China
| | - Yonghua Pan
- Department of Pharmacy, Changhai Hospital, Second Military Medical University, Shanghai, 200433, China
| | - Yuan Gao
- Department of Pharmacy, Changhai Hospital, Second Military Medical University, Shanghai, 200433, China
| | - Peng Fu
- Department of Pharmacy, Changhai Hospital, Second Military Medical University, Shanghai, 200433, China.
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Li YH, Tardif G, Hum D, Kapoor M, Fahmi H, Pelletier JP, Martel-Pelletier J. The unfolded protein response genes in human osteoarthritic chondrocytes: PERK emerges as a potential therapeutic target. Arthritis Res Ther 2016; 18:172. [PMID: 27435272 PMCID: PMC4952234 DOI: 10.1186/s13075-016-1070-6] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2016] [Accepted: 06/30/2016] [Indexed: 12/11/2022] Open
Abstract
BACKGROUND The unfolded protein response (UPR) is activated following an endoplasmic reticulum (ER) stress. The aim of this study was to investigate the global expression of UPR genes in human OA chondrocytes in induced (I)-UPR conditions, and to explore the regulation and role of the UPR genes in homeostatic (H)-UPR conditions in human normal and OA chondrocytes. METHODS Gene expression was determined by PCR array and qPCR. Protein production in cartilage was determined by immunohistochemistry, gene silencing by specific siRNAs, and gene regulation by treating chondrocytes with cytokines and growth factors associated with cartilage pathobiology. RESULTS Several UPR genes, among them ERN1, PERK, and CREB3L2 were downregulated in OA compared to normal chondrocytes at both the mRNA and protein levels, but the ER stress response triggered by thapsigargin or tunicamycin treatment was similar in normal and OA chondrocytes. The activation of ER stress sensors (phosphorylated PERK, cleavage of ATF6B, and the spliced mRNA forms of XBP1) was not significantly increased in OA chondrocytes/cartilage. PDGF-BB and IL-6 significantly downregulated the expression of ERN1, PERK, and CREB3L2, but not that of ATF6B. Silencing experiments done under conditions of no ER stress (physiological conditions) revealed that decreasing ERN1 expression led to decreased COL2a1, MMP-13, ADAMTS4 and ADAMTS5 expression, while decreasing CREB3L2 and ATF6B led to decreased ADAMTS5 and ADAMTS4 expression, respectively. Importantly, the downregulation of PERK expression increased COL1a1 and suppressed COL2a1 expression. CONCLUSIONS Although the level of ER stress is not significantly increased in OA chondrocytes, these cells respond strongly to an acute ER stress despite the decreased expression of ERN1, PERK, and CREB3L2. Emerging findings revealed for the first time that these genes play a role in cartilage biology in conditions where an acute ER stress response is not triggered and OA is not characterized by an overall basal activation of the ER stress response. Importantly, these findings identify PERK as a potential target for new OA treatment avenues.
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Affiliation(s)
- Ying-Hua Li
- Osteoarthritis Research Unit, University of Montreal Hospital Research Centre (CRCHUM), 900 Saint-Denis, R11.412B, Montreal, QC, H2X 0A9, Canada
| | - Ginette Tardif
- Osteoarthritis Research Unit, University of Montreal Hospital Research Centre (CRCHUM), 900 Saint-Denis, R11.412B, Montreal, QC, H2X 0A9, Canada
| | - David Hum
- Osteoarthritis Research Unit, University of Montreal Hospital Research Centre (CRCHUM), 900 Saint-Denis, R11.412B, Montreal, QC, H2X 0A9, Canada
| | - Mohit Kapoor
- Osteoarthritis Research Unit, University of Montreal Hospital Research Centre (CRCHUM), 900 Saint-Denis, R11.412B, Montreal, QC, H2X 0A9, Canada.,Division of Genetics and Development, Toronto Western Research Institute, University Health Network (UHN), Toronto, ON, Canada.,Department of Surgery, University of Toronto, Toronto, ON, Canada
| | - Hassan Fahmi
- Osteoarthritis Research Unit, University of Montreal Hospital Research Centre (CRCHUM), 900 Saint-Denis, R11.412B, Montreal, QC, H2X 0A9, Canada
| | - Jean-Pierre Pelletier
- Osteoarthritis Research Unit, University of Montreal Hospital Research Centre (CRCHUM), 900 Saint-Denis, R11.412B, Montreal, QC, H2X 0A9, Canada
| | - Johanne Martel-Pelletier
- Osteoarthritis Research Unit, University of Montreal Hospital Research Centre (CRCHUM), 900 Saint-Denis, R11.412B, Montreal, QC, H2X 0A9, Canada.
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Interleukin-1β induced Stress Granules Sequester COX-2 mRNA and Regulates its Stability and Translation in Human OA Chondrocytes. Sci Rep 2016; 6:27611. [PMID: 27271770 PMCID: PMC4897887 DOI: 10.1038/srep27611] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2015] [Accepted: 05/20/2016] [Indexed: 12/18/2022] Open
Abstract
Enhanced and immediate expression of cyclooxygenase-2 (COX-2) mRNA is observed in IL-1β-stimulated OA chondrocytes but the synthesis of protein found significantly delayed. Here we investigated the role of stress granules (SGs), ribonucleoprotein complexes that regulate mRNA translation, in the delayed translation of COX-2 mRNAs in IL-1β-stimulated OA chondrocytes. Stimulation of human chondrocytes with IL-1β activated the stress response genes and the phosphorylation of eIF2α that triggered the assembly of SGs. Using combined immunofluorescence staining of SGs markers and COX-2 protein, RNA fluorescence in situ hybridization and RNA immunoprecipitation, the COX-2 mRNAs were found sequestered in SGs in IL-1β-stimulated OA chondrocytes. No increase in COX-2 protein expression was observed during the persistence of SGs but enhanced expression of COX-2 protein was noted upon clearance of the SGs. Inhibition of SGs clearance blocked COX-2 mRNA translation whereas blocking the assembly of SGs by TIA-1 depletion resulted in rapid and increased production of COX-2 and PGE2. Our findings show for the first time assembly of SGs and sequestration of COX-2 mRNAs in human OA chondrocytes under pathological conditions. Post-transcriptional regulation of COX-2 mRNAs translation by SGs indicates a role in IL-1β-mediated catabolic response that could be therapeutically targeted in OA.
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Oxidative stress, autophagy, epigenetic changes and regulation by miRNAs as potential therapeutic targets in osteoarthritis. Biochem Pharmacol 2016; 108:1-10. [DOI: 10.1016/j.bcp.2015.12.012] [Citation(s) in RCA: 91] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2015] [Accepted: 12/14/2015] [Indexed: 02/07/2023]
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Abstract
Thyroglobulin (Tg) is a vertebrate secretory protein synthesized in the thyrocyte endoplasmic reticulum (ER), where it acquires N-linked glycosylation and conformational maturation (including formation of many disulfide bonds), leading to homodimerization. Its primary functions include iodide storage and thyroid hormonogenesis. Tg consists largely of repeating domains, and many tyrosyl residues in these domains become iodinated to form monoiodo- and diiodotyrosine, whereas only a small portion of Tg structure is dedicated to hormone formation. Interestingly, evolutionary ancestors, dependent upon thyroid hormone for development, synthesize thyroid hormones without the complete Tg protein architecture. Nevertheless, in all vertebrates, Tg follows a strict pattern of region I, II-III, and the cholinesterase-like (ChEL) domain. In vertebrates, Tg first undergoes intracellular transport through the secretory pathway, which requires the assistance of thyrocyte ER chaperones and oxidoreductases, as well as coordination of distinct regions of Tg, to achieve a native conformation. Curiously, regions II-III and ChEL behave as fully independent folding units that could function as successful secretory proteins by themselves. However, the large Tg region I (bearing the primary T4-forming site) is incompetent by itself for intracellular transport, requiring the downstream regions II-III and ChEL to complete its folding. A combination of nonsense mutations, frameshift mutations, splice site mutations, and missense mutations in Tg occurs spontaneously to cause congenital hypothyroidism and thyroidal ER stress. These Tg mutants are unable to achieve a native conformation within the ER, interfering with the efficiency of Tg maturation and export to the thyroid follicle lumen for iodide storage and hormonogenesis.
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Affiliation(s)
- Bruno Di Jeso
- Laboratorio di Patologia Generale (B.D.J.), Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali, Università del Salento, 73100 Lecce, Italy; and Division of Metabolism, Endocrinology, and Diabetes (P.A.), University of Michigan Medical School, Ann Arbor, Michigan 48105
| | - Peter Arvan
- Laboratorio di Patologia Generale (B.D.J.), Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali, Università del Salento, 73100 Lecce, Italy; and Division of Metabolism, Endocrinology, and Diabetes (P.A.), University of Michigan Medical School, Ann Arbor, Michigan 48105
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Monosodium Urate Crystal-Induced Chondrocyte Death via Autophagic Process. Int J Mol Sci 2015; 16:29265-77. [PMID: 26670233 PMCID: PMC4691108 DOI: 10.3390/ijms161226164] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2015] [Revised: 11/26/2015] [Accepted: 11/30/2015] [Indexed: 12/19/2022] Open
Abstract
Monosodium urate (MSU) crystals, which are highly precipitated in the joint cartilage, increase the production of cartilage-degrading enzymes and pro-inflammatory mediators in cartilage, thereby leading to gouty inflammation and joint damage. In this study, we investigated the effect of MSU crystals on the viability of human articular chondrocytes and the mechanism of MSU crystal-induced chondrocyte death. MSU crystals significantly decreased the viability of primary chondrocytes in a time- and dose-dependent manner. DNA fragmentation was observed in a culture medium of MSU crystal-treated chondrocytes, but not in cell lysates. MSU crystals did not activate caspase-3, a marker of apoptosis, compared with actinomycin D and TNF-α-treated cells. MSU crystals did not directly affect the expression of endoplasmic reticulum (ER) stress markers at the mRNA and protein levels. However, MSU crystals significantly increased the LC3-II level in a time-dependent manner, indicating autophagy activation. Moreover, MSU crystal-induced autophagy and subsequent chondrocyte death were significantly inhibited by 3-methyladenine, a blocker of autophagosomes formation. MSU crystals activated autophagy via inhibition of phosporylation of the Akt/mTOR signaling pathway. These results demonstrate that MSU crystals may cause the death of chondrocytes through the activation of the autophagic process rather than apoptosis or ER stress.
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Ying R, Wang XQ, Yang Y, Gu ZJ, Mai JT, Qiu Q, Chen YX, Wang JF. Hydrogen sulfide suppresses endoplasmic reticulum stress-induced endothelial-to-mesenchymal transition through Src pathway. Life Sci 2015; 144:208-17. [PMID: 26656263 DOI: 10.1016/j.lfs.2015.11.025] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2015] [Revised: 10/20/2015] [Accepted: 11/24/2015] [Indexed: 01/09/2023]
Abstract
AIMS Hydrogen sulfide (H2S) ameliorates cardiac fibrosis in several models by suppressing endoplasmic reticulum (ER) stress. Endothelial-to-mesenchymal transition (EndMT) is implicated in the development of cardiac fibrosis. Therefore, we investigated whether H2S could attenuate EndMT by suppressing ER stress. MAIN METHODS ER stress was induced by tunicamycin (TM) and thapsigargin (TG) and inhibited by 4-phenylbutyrate (4-PBA) in human umbilical vein endothelial cells (HUVECs). ER stress and EndMT were measured by Western blot, Real-Time PCR and immunofluorescence staining. Inhibition Smad2 and Src pathway were performed by specific inhibitors and siRNA. Ultrastructural examination was detected by transmission electron microscope. The functions of HUVECs were investigated by cell migration assay and tube formation in vitro. KEY FINDINGS Under ER stress, the expression of endothelial marker CD31 significantly decreased while mesenchymal markers α-SMA, vimentin and collagen 1 increased which could be inhibited by 4-PBA. Moreover, HUVECs changed into a fibroblast-like appearance with the activation of Smad2 and Src kinase pathway. After inhibiting Src pathway, EndMT would be significantly inhibited. TM reduced H2S levels in cell lysate and H2S pretreatment could preserve endothelial cell appearance with decreased ER stress and ameliorated dilation of ER. H2S could also downregulate the mesenchymal marker expression, and upregulate the endothelial markers expression, accompanied with the suppression of Src pathway. Moreover, H2S partially restored the capacity of migration and tube formation in HUVECs. SIGNIFICANCE These results revealed that H2S could protect against ER stress-induced EndMT through Src pathway, which may be a novel role for the cardioprotection of H2S.
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Affiliation(s)
- Ru Ying
- Department of Cardiology, Sun Yat-sen Memorial Hospital of Sun Yat-sen University, Guangzhou 510120, People's Republic of China; Guangdong Province Key Laboratory of Arrhythmia and Electrophysiology, Guangzhou 510120, People's Republic of China
| | - Xiao-Qiao Wang
- Department of Anesthesia, The Second Affiliated Hospital of Guangzhou Medical University, Guangzhou 510260, People's Republic of China
| | - Ying Yang
- Department of Cardiology, Sun Yat-sen Memorial Hospital of Sun Yat-sen University, Guangzhou 510120, People's Republic of China; Guangdong Province Key Laboratory of Arrhythmia and Electrophysiology, Guangzhou 510120, People's Republic of China
| | - Zhen-Jie Gu
- Department of Cardiology, Sun Yat-sen Memorial Hospital of Sun Yat-sen University, Guangzhou 510120, People's Republic of China; Guangdong Province Key Laboratory of Arrhythmia and Electrophysiology, Guangzhou 510120, People's Republic of China
| | - Jing-Ting Mai
- Department of Cardiology, Sun Yat-sen Memorial Hospital of Sun Yat-sen University, Guangzhou 510120, People's Republic of China; Guangdong Province Key Laboratory of Arrhythmia and Electrophysiology, Guangzhou 510120, People's Republic of China
| | - Qiong Qiu
- Department of Cardiology, Sun Yat-sen Memorial Hospital of Sun Yat-sen University, Guangzhou 510120, People's Republic of China; Guangdong Province Key Laboratory of Arrhythmia and Electrophysiology, Guangzhou 510120, People's Republic of China
| | - Yang-Xin Chen
- Department of Cardiology, Sun Yat-sen Memorial Hospital of Sun Yat-sen University, Guangzhou 510120, People's Republic of China; Guangdong Province Key Laboratory of Arrhythmia and Electrophysiology, Guangzhou 510120, People's Republic of China.
| | - Jing-Feng Wang
- Department of Cardiology, Sun Yat-sen Memorial Hospital of Sun Yat-sen University, Guangzhou 510120, People's Republic of China; Guangdong Province Key Laboratory of Arrhythmia and Electrophysiology, Guangzhou 510120, People's Republic of China.
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Chondrocyte Apoptosis in the Pathogenesis of Osteoarthritis. Int J Mol Sci 2015; 16:26035-54. [PMID: 26528972 PMCID: PMC4661802 DOI: 10.3390/ijms161125943] [Citation(s) in RCA: 581] [Impact Index Per Article: 64.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2015] [Revised: 10/03/2015] [Accepted: 10/21/2015] [Indexed: 11/16/2022] Open
Abstract
Apoptosis is a highly-regulated, active process of cell death involved in development, homeostasis and aging. Dysregulation of apoptosis leads to pathological states, such as cancer, developmental anomalies and degenerative diseases. Osteoarthritis (OA), the most common chronic joint disease in the elderly population, is characterized by progressive destruction of articular cartilage, resulting in significant disability. Because articular cartilage depends solely on its resident cells, the chondrocytes, for the maintenance of extracellular matrix, the compromising of chondrocyte function and survival would lead to the failure of the articular cartilage. The role of subchondral bone in the maintenance of proper cartilage matrix has been suggested as well, and it has been proposed that both articular cartilage and subchondral bone interact with each other in the maintenance of articular integrity and physiology. Some investigators include both articular cartilage and subchondral bone as targets for repairing joint degeneration. In late-stage OA, the cartilage becomes hypocellular, often accompanied by lacunar emptying, which has been considered as evidence that chondrocyte death is a central feature in OA progression. Apoptosis clearly occurs in osteoarthritic cartilage; however, the relative contribution of chondrocyte apoptosis in the pathogenesis of OA is difficult to evaluate, and contradictory reports exist on the rate of apoptotic chondrocytes in osteoarthritic cartilage. It is not clear whether chondrocyte apoptosis is the inducer of cartilage degeneration or a byproduct of cartilage destruction. Chondrocyte death and matrix loss may form a vicious cycle, with the progression of one aggravating the other, and the literature reveals that there is a definite correlation between the degree of cartilage damage and chondrocyte apoptosis. Because current treatments for OA act only on symptoms and do not prevent or cure OA, chondrocyte apoptosis would be a valid target to modulate cartilage degeneration.
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Liu F, Weng X, Lin P, Zheng C, Xu H, Liu X, Ye H, Li X. Duhuo Jisheng decoction inhibits endoplasmic reticulum stress in chondrocytes induced by tunicamycin through the downregulation of miR-34a. Int J Mol Med 2015; 36:1311-8. [PMID: 26329269 DOI: 10.3892/ijmm.2015.2331] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2015] [Accepted: 07/13/2015] [Indexed: 11/05/2022] Open
Abstract
Our previous study showed that Duhuo Jisheng decoction (DHJSD) inhibited chondrocyte apoptosis by the mitochondria-dependent signaling pathway. Endoplasmic reticulum (ER) stress is upstream of the mitochondria-dependent signaling pathway and has been shown to promote chondrocyte apoptosis that occurs in osteoarthritis (OA). The present study aimed to evaluate whether DHJSD inhibits the chondrocyte apoptosis by regulating ER stress. DHJSD enhanced the viability of tunicamycin (TM)‑exposed chondrocytes, a model of ER stress-induced apoptosis, in a dose‑ and time‑dependent manner, as shown by MTT assay. The present results showed that DHJSD and sodium 4-phenylbutyrate (PBA), an ER stress inhibitor, reduced TM‑induced chondrocyte apoptosis by 4',6-diamidino‑2-phenylindole staining. To gain insight into the mechanisms of DHJSD that are responsible for enhancing the viability and inhibiting TM‑induced chondrocyte apoptosis, the associated mRNA expressions and protein levels were detected by reverse transcription‑polymerase chain reaction (RT‑PCR) and western blot analysis, respectively. The results showed that the expression levels of Xbp1, Xbp1s and Bcl‑2 were increased, and the expression levels of Bip, Atf4, Chop, Bax, caspase‑9 and ‑3 were decreased in the TM‑exposed chondrocytes treated with DHJSD or PBA compared with that in the TM‑exposed chondrocytes. To identify the possible mechanisms, the expression of miR‑34a was examined by the TaqMan microRNA assay, and was downregulated in the TM‑exposed chondrocytes treated with DHJSD or PBA compared with that in the TM-exposed chondrocytes. DHJSD inhibits ER stress in chondrocytes induced by exposure to TM by downregulating miR‑34a, suggesting that DHJSD may be a potential therapeutic agent for OA.
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Affiliation(s)
- Fayuan Liu
- Academy of Integrative Medicine, Fujian University of Traditional Chinese Medicine, Fuzhou, Fujian 350122, P.R. China
| | - Xiaping Weng
- College of Pharmacy, Fujian University of Traditional Chinese Medicine, Fuzhou, Fujian 350122, P.R. China
| | - Pingdong Lin
- College of Pharmacy, Fujian University of Traditional Chinese Medicine, Fuzhou, Fujian 350122, P.R. China
| | - Chunsong Zheng
- Academy of Integrative Medicine, Fujian University of Traditional Chinese Medicine, Fuzhou, Fujian 350122, P.R. China
| | - Huifeng Xu
- Academy of Integrative Medicine, Fujian University of Traditional Chinese Medicine, Fuzhou, Fujian 350122, P.R. China
| | - Xianxiang Liu
- Academy of Integrative Medicine, Fujian University of Traditional Chinese Medicine, Fuzhou, Fujian 350122, P.R. China
| | - Hongzhi Ye
- Academy of Integrative Medicine, Fujian University of Traditional Chinese Medicine, Fuzhou, Fujian 350122, P.R. China
| | - Xihai Li
- Academy of Integrative Medicine, Fujian University of Traditional Chinese Medicine, Fuzhou, Fujian 350122, P.R. China
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Liu C, Cao Y, Yang X, Shan P, Liu H. Tauroursodeoxycholic acid suppresses endoplasmic reticulum stress in the chondrocytes of patients with osteoarthritis. Int J Mol Med 2015; 36:1081-7. [PMID: 26238983 DOI: 10.3892/ijmm.2015.2295] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2014] [Accepted: 06/26/2015] [Indexed: 11/06/2022] Open
Abstract
The main pathogenic events in osteoarthritis (OA) include loss and abnormal remodeling of cartilage extracellular matrix. The present study aimed to evaluate the protective effect of tauroursodeoxycholic acid on chondrocyte apoptosis induced by endoplasmic reticulum (ER) stress. Articular cartilage tissues were collected from 18 patients who underwent total knee arthroplasty and were analyzed histologically. Subsequently, chondrocyte apoptosis was assessed by TUNEL. Quantitative polymerase chain reaction and western blot analysis were employed to evaluate gene and protein expression, respectively, of ER stress markers, including glucose‑regulated protein 78 (GRP78), growth arrest and DNA‑damage‑inducible gene 153 (GADD153) and caspase‑12 along with type II collagen. Chondrocytes obtained from osteoarthritis patients at different stages were cultured in three conditions including: No treatment (CON group), tunicamycin treatment to induce ER stress (ERS group) and tauroursodeoxycholic acid treatment after 4 h of tunicamycin (TDA group); and cell proliferation, apoptosis, function and ER stress level were assessed. Degradation of cartilage resulted in histological damage with more apoptotic cartilage cells observed. Of note, GRP78, GADD153 and caspase‑12 mRNA and protein expression increased gradually from grade I to III cartilage tissue, while type II collagen expression decreased. Tunicamycin induced ER stress, as shown by a high expression of ER stress markers, reduced cell proliferation, increased apoptosis and decreased synthesis of type II collagen. Notably, tauroursodeoxycholic acid treatment resulted in the improvement of tunicamycin‑induced ER stress. These results indicated that ER stress is highly involved in the tunicamycin‑induced apoptosis in chondrocytes, which can be prevented by tauroursodeoxycholic acid.
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Affiliation(s)
- Chao Liu
- Department of Orthopedics, Xinqiao Hospital, Third Military Medical University, Chongqing 400037, P.R. China
| | - Yongping Cao
- Department of Orthopedics, Peking University First Hospital, Beijing 100034, P.R. China
| | - Xin Yang
- Department of Orthopedics, Peking University First Hospital, Beijing 100034, P.R. China
| | - Pengcheng Shan
- Department of Orthopedics, Peking University First Hospital, Beijing 100034, P.R. China
| | - Heng Liu
- Department of Orthopedics, Peking University First Hospital, Beijing 100034, P.R. China
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Koyuncu S, Irmak D, Saez I, Vilchez D. Defining the General Principles of Stem Cell Aging: Lessons from Organismal Models. CURRENT STEM CELL REPORTS 2015. [DOI: 10.1007/s40778-015-0017-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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Woo SM, Min KJ, Kwon TK. Melatonin-mediated Bim up-regulation and cyclooxygenase-2 (COX-2) down-regulation enhances tunicamycin-induced apoptosis in MDA-MB-231 cells. J Pineal Res 2015; 58:310-20. [PMID: 25711465 DOI: 10.1111/jpi.12217] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/02/2015] [Accepted: 02/20/2015] [Indexed: 12/12/2022]
Abstract
Melatonin is involved in many physiological functions, and it has differential effects on apoptosis in normal and cancer cells. However, the mechanism of its antitumor roles is not well understood. In this study, we show that melatonin enhances tunicamycin-induced apoptosis in human breast carcinoma MDA-MB-231 cells. Melatonin up-regulates pro-apoptotic protein Bim expression at the transcriptional levels in the presence of tunicamycin. Melatonin inhibits tunicamycin-induced COX-2 expression in MDA-MB-231 cells. Furthermore, inhibition of COX-2 activity using the COX-2 inhibitor, NS398, increases tunicamycin-induced apoptosis. Interestingly, these effects were not associated with melatonin receptor signal pathways. Pertussis toxin (a general Gi protein inhibitor) or luzindole (a nonspecific melatonin receptor antagonist) did not reverse the effect of melatonin. In addition, melatonin blocked tunicamycin-induced NF-κB transcriptional activity, p65 nuclear translocation, and p38 MAPK activation. Melatonin-mediated p38 MAPK inhibition contributed to decreased COX-2 mRNA stability. Taken together, our results suggest that melatonin enhances antitumor function through up-regulation of Bim expression and down-regulation of COX-2 expression in tunicamycin-treated MDA-MB-231 cells.
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Affiliation(s)
- Seon Min Woo
- Department of Immunology, School of Medicine, Keimyung University, Dalseo-Gu, Daegu, South Korea
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Epithelial Xbp1 is required for cellular proliferation and differentiation during mammary gland development. Mol Cell Biol 2015; 35:1543-56. [PMID: 25713103 DOI: 10.1128/mcb.00136-15] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2015] [Accepted: 02/11/2015] [Indexed: 12/12/2022] Open
Abstract
Xbp1, a key mediator of the unfolded protein response (UPR), is activated by IRE1α-mediated splicing, which results in a frameshift to encode a protein with transcriptional activity. However, the direct function of Xbp1 in epithelial cells during mammary gland development is unknown. Here we report that the loss of Xbp1 in the mammary epithelium through targeted deletion leads to poor branching morphogenesis, impaired terminal end bud formation, and spontaneous stromal fibrosis during the adult virgin period. Additionally, epithelial Xbp1 deletion induces endoplasmic reticulum (ER) stress in the epithelium and dramatically inhibits epithelial proliferation and differentiation during lactation. The synthesis of milk and its major components, α/β-casein and whey acidic protein (WAP), is significantly reduced due to decreased prolactin receptor (Prlr) and ErbB4 expression in Xbp1-deficient mammary epithelium. Reduction of Prlr and ErbB4 expression and their diminished availability at the cell surface lead to reduced phosphorylated Stat5, an essential regulator of cell proliferation and differentiation during lactation. As a result, lactating mammary glands in these mice produce less milk protein, leading to poor pup growth and postnatal death. These findings suggest that the loss of Xbp1 induces a terminal UPR which blocks proliferation and differentiation during mammary gland development.
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Sheshadri N, Catanzaro JM, Bott AJ, Sun Y, Ullman E, Chen EI, Pan JA, Wu S, Crawford HC, Zhang J, Zong WX. SCCA1/SERPINB3 promotes oncogenesis and epithelial-mesenchymal transition via the unfolded protein response and IL6 signaling. Cancer Res 2014; 74:6318-29. [PMID: 25213322 DOI: 10.1158/0008-5472.can-14-0798] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The serine/cysteine protease inhibitor SCCA1 (SERPINB3) is upregulated in many advanced cancers with poor prognosis, but there is limited information about whether it makes functional contributions to malignancy. Here, we show that SCCA1 expression promoted oncogenic transformation and epithelial-mesenchymal transition (EMT) in mammary epithelial cells, and that SCCA1 silencing in breast cancer cells halted their proliferation. SCCA1 overexpression in neu(+) mammary tumors increased the unfolded protein response (UPR), IL6 expression, and inflammatory phenotypes. Mechanistically, SCCA1 induced a prolonged nonlethal increase in the UPR that was sufficient to activate NF-κB and expression of the protumorigenic cytokine IL6. Overall, our findings established that SCCA1 contributes to tumorigenesis by promoting EMT and a UPR-dependent induction of NF-κB and IL6 autocrine signaling that promotes a protumorigenic inflammation.
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Affiliation(s)
- Namratha Sheshadri
- Department of Molecular Genetics and Microbiology, Stony Brook University, Stony Brook, New York
| | - Joseph M Catanzaro
- Department of Molecular Genetics and Microbiology, Stony Brook University, Stony Brook, New York
| | - Alex J Bott
- Department of Molecular Genetics and Microbiology, Stony Brook University, Stony Brook, New York
| | - Yu Sun
- Department of Molecular Genetics and Microbiology, Stony Brook University, Stony Brook, New York
| | - Erica Ullman
- Department of Molecular Genetics and Microbiology, Stony Brook University, Stony Brook, New York
| | - Emily I Chen
- Department of Pharmacological Sciences, Stony Brook University, Stony Brook, New York
| | - Ji-An Pan
- Department of Molecular Genetics and Microbiology, Stony Brook University, Stony Brook, New York
| | - Song Wu
- Department of Applied Math and Statistics, Stony Brook University, Stony Brook, New York
| | | | - Jianhua Zhang
- Department of Pathology, University of Alabama, Birmingham VA Medical Center, Birmingham, Alabama
| | - Wei-Xing Zong
- Department of Molecular Genetics and Microbiology, Stony Brook University, Stony Brook, New York.
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Xu H, Tsang KS, Wang Y, Chan JC, Xu G, Gao WQ. Unfolded protein response is required for the definitive endodermal specification of mouse embryonic stem cells via Smad2 and β-catenin signaling. J Biol Chem 2014; 289:26290-26301. [PMID: 25092289 DOI: 10.1074/jbc.m114.572560] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Tremendous efforts have been made to elucidate the molecular mechanisms that control the specification of definitive endoderm cell fate in gene knockout mouse models and ES cell (ESC) differentiation models. However, the impact of the unfolded protein response (UPR), because of the stress of the endoplasmic reticulum on endodermal specification, is not well addressed. We employed UPR-inducing agents, thapsigargin and tunicamycin, in vitro to induce endodermal differentiation of mouse ESCs. Apart from the endodermal specification of ESCs, Western blotting demonstrated the enhanced phosphorylation of Smad2 and nuclear translocation of β-catenin in ESC-derived cells. The inclusion of the endoplasmic reticulum stress inhibitor tauroursodeoxycholic acid to the induction cultures prevented the differentiation of ESCs into definitive endodermal cells even when Activin A was supplemented. Also, the addition of the TGF-β inhibitor SB431542 and the Wnt/β-catenin antagonist IWP-2 negated the endodermal differentiation of ESCs mediated by thapsigargin and tunicamycin. These data suggest that the activation of the UPR appears to orchestrate the induction of the definitive endodermal cell fate of ESCs via both the Smad2 and β-catenin signaling pathways. The prospective regulatory machinery may be helpful for directing ESCs to differentiate into definitive endodermal cells for cellular therapy in the future.
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Affiliation(s)
- Huiming Xu
- State Key Laboratory of Oncogenes and Related Genes, Renji-MedX Clinical Stem Cell Research Center, Ren Ji Hospital, School of Medicine and Shanghai Jiao Tong University, Shanghai 200127, China; School of Biomedical Engineering and Med-X Research Institute, Shanghai Jiao Tong University, Shanghai 200127, China and
| | - Kam Sze Tsang
- Department of Anatomical and Cellular Pathology, The Chinese University of Hong Kong, The Prince of Wales Hospital, Shatin, Hong Kong, China
| | - Yonghui Wang
- State Key Laboratory of Oncogenes and Related Genes, Renji-MedX Clinical Stem Cell Research Center, Ren Ji Hospital, School of Medicine and Shanghai Jiao Tong University, Shanghai 200127, China; School of Biomedical Engineering and Med-X Research Institute, Shanghai Jiao Tong University, Shanghai 200127, China and
| | - Juliana Cn Chan
- Department of Medicine and Therapeutics, The Chinese University of Hong Kong, The Prince of Wales Hospital, Shatin, Hong Kong, China; Li Ka Shing Institute of Health Sciences and The Chinese University of Hong Kong, The Prince of Wales Hospital, Shatin, Hong Kong, China
| | - Gang Xu
- Department of Medicine and Therapeutics, The Chinese University of Hong Kong, The Prince of Wales Hospital, Shatin, Hong Kong, China; Shenzhen Research Institute, The Chinese University of Hong Kong, The Prince of Wales Hospital, Shatin, Hong Kong, China; Li Ka Shing Institute of Health Sciences and The Chinese University of Hong Kong, The Prince of Wales Hospital, Shatin, Hong Kong, China.
| | - Wei-Qiang Gao
- State Key Laboratory of Oncogenes and Related Genes, Renji-MedX Clinical Stem Cell Research Center, Ren Ji Hospital, School of Medicine and Shanghai Jiao Tong University, Shanghai 200127, China; School of Biomedical Engineering and Med-X Research Institute, Shanghai Jiao Tong University, Shanghai 200127, China and.
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Moon SY, Kim HS, Nho KW, Jang YJ, Lee SK. Endoplasmic reticulum stress induces epithelial-mesenchymal transition through autophagy via activation of c-Src kinase. Nephron Clin Pract 2014; 126:127-40. [PMID: 24863135 DOI: 10.1159/000362457] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2013] [Accepted: 03/20/2014] [Indexed: 01/22/2023] Open
Abstract
BACKGROUND Endoplasmic reticulum (ER) stress has been implicated in inducing epithelial-mesenchymal transition (EMT). ER stress is also known to induce autophagy. However, it is unclear whether ER stress-induced autophagy contributes to EMT. We hypothesized that ER stress might induce EMT through autophagy via activation of c-Src kinase in tubular epithelial cells. METHOD All experiments were performed using HK-2 cells. Protein expression was measured by Western blot analysis. Immunofluorescence and small interfering RNA (siRNA) experiments were performed. RESULTS Chemical ER stress inducers such as tunicamycin (TM, 0.2 μM) and thapsigargin (TG, 0.2 μM) induced EMT, as shown by upregulation of α-smooth muscle actin and downregulation of E-cadherin. ER stress inhibitors such as 4-PBA and salubrinal suppressed both TM- and TG-induced EMT. TM and TG also induced autophagy, as evidenced by upregulation of LC3-II and beclin-1, which were abolished by pretreatment with ER stress inhibitors. Transfection with siRNA targeting ER stress protein (IRE-1) blocked the TM- or TG-induced EMT and autophagy. Autophagy inhibitors such as 3-methyladenine and bafilomycin inhibited the TM- or TG-induced EMT. Transfection with siRNA targeting autophagy protein (beclin-1) also blocked the TM- or TG-induced EMT. Both TM and TG induced activation of c-Src kinase. Inhibitor of c-Src kinase (PP2) suppressed the TM- or TG-induced autophagy and EMT. CONCLUSION ER stress by TM or TG induced EMT through autophagy via activation of c-Src kinase in tubular epithelial cells.
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Affiliation(s)
- Soo Young Moon
- Department of Internal Medicine, Asan Medical Center, University of Ulsan, Seoul, Korea
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Proteostasis and aging of stem cells. Trends Cell Biol 2014; 24:161-70. [DOI: 10.1016/j.tcb.2013.09.002] [Citation(s) in RCA: 108] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2013] [Revised: 09/04/2013] [Accepted: 09/04/2013] [Indexed: 12/13/2022]
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Zeindl-Eberhart E, Brandl L, Liebmann S, Ormanns S, Scheel SK, Brabletz T, Kirchner T, Jung A. Epithelial-mesenchymal transition induces endoplasmic-reticulum-stress response in human colorectal tumor cells. PLoS One 2014; 9:e87386. [PMID: 24498091 PMCID: PMC3909180 DOI: 10.1371/journal.pone.0087386] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2013] [Accepted: 12/23/2013] [Indexed: 12/01/2022] Open
Abstract
Tumor cells are stressed by unfavorable environmental conditions like hypoxia or starvation. Driven by the resulting cellular stress tumor cells undergo epithelial-mesenchymal transition. Additionally, cellular stress is accompanied by endoplasmic reticulum-stress which induces an unfolded protein response. It is unknown if epithelial-mesenchymal transition and endoplasmic reticulum-stress are occurring as independent parallel events or if an interrelationship exists between both of them. Here, we show that in colorectal cancer cells endoplasmic reticulum-stress depends on the induction of ZEB-1, which is a main factor of epithelial-mesenchymal transition. In the absence of ZEB-1 colorectal cancer cells cannot mount endoplasmic reticulum-stress as a reaction on cellular stress situations like hypoxia or starvation. Thus, our data suggest that there is a hierarchy in the development of cellular stress which starts with the presence of environmental stress that induces epithelial-mesenchymal transition which allows finally endoplasmic reticulum-stress. This finding highlights the central role of epithelial-mesenchymal transition during the process of tumorigenesis as epithelial-mesenchymal transition is also associated with chemoresistance and cancer stemness. Consequently, endoplasmic reticulum-stress might be a well suited target for chemotherapy of colorectal cancers.
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Affiliation(s)
| | - Lydia Brandl
- Institute of Pathology, University of Munich, Munich, Germany
- * E-mail:
| | | | - Steffen Ormanns
- Institute of Pathology, University of Munich, Munich, Germany
| | | | - Thomas Brabletz
- Department of Visceral Surgery, University of Freiburg, Freiburg, Germany
| | - Thomas Kirchner
- Institute of Pathology, University of Munich, Munich, Germany
| | - Andreas Jung
- Institute of Pathology, University of Munich, Munich, Germany
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Gilbert SJ, Meakin LB, Bonnet CS, Nowell MA, Ladiges WC, Morton J, Duance VC, Mason DJ. Deletion of P58(IPK), the Cellular Inhibitor of the Protein Kinases PKR and PERK, Causes Bone Changes and Joint Degeneration in Mice. Front Endocrinol (Lausanne) 2014; 5:174. [PMID: 25368604 PMCID: PMC4201149 DOI: 10.3389/fendo.2014.00174] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/06/2014] [Accepted: 10/01/2014] [Indexed: 11/26/2022] Open
Abstract
OBJECTIVE Protein kinase-like endoplasmic reticulum kinase (PERK) and protein kinase R (PKR) are implicated in endoplasmic reticulum stress-induced arthritis and pro-inflammatory cytokine-mediated cartilage degradation in vitro, respectively. We determined whether knockout of the cellular inhibitor of PERK and PKR, P58(IPK) causes joint degeneration in vivo and whether these molecules are activated in human osteoarthritis (OA). MATERIALS AND METHODS Sections of knee joints from P58(IPK)-null and wild-type mice aged 12-13 and 23-25 months were stained with toluidine blue and scored for degeneration using the osteoarthritis research society international (OARSI) system. Bone changes were assessed by radiology and high-resolution micro-computed tomography of hind limbs. Sections from the medial tibial plateaus of two human knees, removed in total knee replacement surgery for OA, were immunolabelled for phosphorylated PERK and PKR and P58(IPK). RESULTS Knockout mice exhibited narrower tibiae (p = 0.0031) and smaller epiphyses in tibiae (p = 0.0004) and femora (p = 0.0214). Older knockout mice had reduced total volume inside the femoral periosteal envelope (p = 0.023), reduced tibial (p = 0.03), and femoral (p = 0.0012) bone volumes (BV) and reduced femoral BV fraction (p = 0.025). Compared with wild-types, younger P58(IPK)-null mice had increased OARSI scores in medial femoral condyles (p = 0.035). Thirty four percent of null mice displayed severe joint degeneration with complete articular cartilage loss from the medial compartment and heterotopic chondro-osseous tissue in the medial joint capsule. Phosphorylated PERK and PKR were localized throughout human osteoarthritic tibial plateaus but, in particular, in areas exhibiting the most degeneration. There was limited expression of P58(IPK). CONCLUSION This study is the first to reveal a critical role for P58(IPK) in maintaining joint integrity in vivo, implicating the PKR and PERK stress signaling pathways in bony changes underlying the pathogenesis of joint degeneration.
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Affiliation(s)
- Sophie J. Gilbert
- Pathophysiology and Repair Division, Arthritis Research UK Biomechanics and Bioengineering Centre, School of Biosciences, Cardiff University, Cardiff, UK
| | - Lee B. Meakin
- School of Veterinary Sciences, University of Bristol, Bristol, UK
| | - Cleo S. Bonnet
- Pathophysiology and Repair Division, Arthritis Research UK Biomechanics and Bioengineering Centre, School of Biosciences, Cardiff University, Cardiff, UK
| | - Mari A. Nowell
- Section of Inflammation, Skin and Joint Disease, Institute of Infection and Immunity, School of Medicine, Cardiff University, Cardiff, UK
| | - Warren C. Ladiges
- Department of Comparative Medicine, School of Medicine, University of Washington, Seattle, WA, USA
| | - John Morton
- Department of Comparative Medicine, School of Medicine, University of Washington, Seattle, WA, USA
| | - Victor C. Duance
- Pathophysiology and Repair Division, Arthritis Research UK Biomechanics and Bioengineering Centre, School of Biosciences, Cardiff University, Cardiff, UK
| | - Deborah J. Mason
- Pathophysiology and Repair Division, Arthritis Research UK Biomechanics and Bioengineering Centre, School of Biosciences, Cardiff University, Cardiff, UK
- *Correspondence: Deborah J. Mason, Arthritis Research UK Biomechanics and Bioengineering Centre, School of Biosciences, Cardiff University, Museum Avenue, Cardiff CF10 3AX, UK e-mail:
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Johno H, Kitamura M. Pathological in situ reprogramming of somatic cells by the unfolded protein response. THE AMERICAN JOURNAL OF PATHOLOGY 2013; 183:644-54. [PMID: 23831328 DOI: 10.1016/j.ajpath.2013.05.008] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2013] [Revised: 05/07/2013] [Accepted: 05/10/2013] [Indexed: 12/19/2022]
Abstract
In response to tissue injuries, terminally differentiated cells are reprogrammed to undergo dedifferentiation to gain mitogenic and metabolic properties. The dedifferentiated cells acquire an immature phenotype, proliferate actively, produce abundant extracellular matrix, and recruit circulating leukocytes via secretion of chemokines, contributing to tissue repair and/or fibrosis. However, this remodeling process is self-limiting, and in the later phase, the activated, dedifferentiated cells are reprogrammed to redifferentiate into a mature, quiescent phenotype. Currently, molecular mechanisms underlying this bidirectional pathological reprogramming remain elusive. It is known that the unfolded protein response (UPR) is induced at local tissues under pathological situations and affects cellular fate-survival or death. It is also known that the UPR is involved in cell differentiation and organogenesis during embryonic development. In this review, we describe a hypothesis for regulatory roles of the UPR in the pathological reprogramming of somatic cells (ie, cellular dedifferentiation and redifferentiation at the sites of injury).
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Affiliation(s)
- Hisashi Johno
- Department of Molecular Signaling, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, Yamanashi, Japan
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CCN2/CTGF is required for matrix organization and to protect growth plate chondrocytes from cellular stress. J Cell Commun Signal 2013; 7:219-30. [PMID: 23666466 PMCID: PMC3709047 DOI: 10.1007/s12079-013-0201-y] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2013] [Accepted: 04/22/2013] [Indexed: 12/11/2022] Open
Abstract
CCN2 (connective tissue growth factor (CTGF/CCN2)) is a matricellular protein that utilizes integrins to regulate cell proliferation, migration and survival. The loss of CCN2 leads to perinatal lethality resulting from a severe chondrodysplasia. Upon closer inspection of Ccn2 mutant mice, we observed defects in extracellular matrix (ECM) organization and hypothesized that the severe chondrodysplasia caused by loss of CCN2 might be associated with defective chondrocyte survival. Ccn2 mutant growth plate chondrocytes exhibited enlarged endoplasmic reticula (ER), suggesting cellular stress. Immunofluorescence analysis confirmed elevated stress in Ccn2 mutants, with reduced stress observed in Ccn2 overexpressing transgenic mice. In vitro studies revealed that Ccn2 is a stress responsive gene in chondrocytes. The elevated stress observed in Ccn2−/− chondrocytes is direct and mediated in part through integrin α5. The expression of the survival marker NFκB and components of the autophagy pathway were decreased in Ccn2 mutant growth plates, suggesting that CCN2 may be involved in mediating chondrocyte survival. These data demonstrate that absence of a matricellular protein can result in increased cellular stress and highlight a novel protective role for CCN2 in chondrocyte survival. The severe chondrodysplasia caused by the loss of CCN2 may be due to increased chondrocyte stress and defective activation of autophagy pathways, leading to decreased cellular survival. These effects may be mediated through nuclear factor κB (NFκB) as part of a CCN2/integrin/NFκB signaling cascade.
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Hamamura K, Lin CC, Yokota H. Salubrinal reduces expression and activity of MMP13 in chondrocytes. Osteoarthritis Cartilage 2013; 21:764-72. [PMID: 23473976 DOI: 10.1016/j.joca.2013.02.657] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/16/2012] [Revised: 02/04/2013] [Accepted: 02/25/2013] [Indexed: 02/02/2023]
Abstract
OBJECTIVE Stress to the endoplasmic reticulum (ER) and inflammatory cytokines induce expression and activity of matrix metalloproteinase 13 (MMP13). Since a synthetic agent, salubrinal, is known to alleviate ER stress and attenuate nuclear factor kappa B (NFκB) signaling, we addressed a question whether upregulation of MMP13 by ER stress and cytokines is suppressed by administration of salubrinal. METHODS Using C28/I2 human chondrocytes, we applied ER stress with tunicamycin and inflammatory distress with tumor necrosis factor α (TNFα) and interleukin 1β (IL1β). RNA interference with siRNA specific to NFκB p65 (RelA) was employed to examine a potential involvement of NFκB signaling in salubrinal's action in regulation of MMP13. We also employed primary human chondrocytes and evaluated MMP13 activity. RESULTS The result showed that tunicamycin activated p38 mitogen-activated protein kinase (MAPK), while inflammatory cytokines activated p38 MAPK and NFκB. In both cases, salubrinal significantly reduced expression and activity of MMP13. Silencing NFκB reduced inflammatory cytokine-driven upregulation of MMP13 activity. CONCLUSIONS The results demonstrate that salubrinal downregulates expression and activity MMP13 through p38 and NFκB signaling, suggesting its potential usage to treat degenerative diseases such as osteoarthritis.
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Affiliation(s)
- K Hamamura
- Department of Biomedical Engineering, Indiana University - Purdue University Indianapolis, Indianapolis, IN 46202, USA.
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Takada K, Hirose J, Yamabe S, Uehara Y, Mizuta H. Endoplasmic reticulum stress mediates nitric oxide-induced chondrocyte apoptosis. Biomed Rep 2013; 1:315-319. [PMID: 24648941 DOI: 10.3892/br.2013.52] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2012] [Accepted: 12/24/2012] [Indexed: 11/06/2022] Open
Abstract
Nitric oxide (NO) is one of the most important mediators of chondrocyte apoptosis, which is a notable feature of cartilage degeneration. While apoptosis of chondrocytes is induced by p53, NO can also induce endoplasmic reticulum (ER) stress, which may be involved in the process of NO-induced chondrocyte apoptosis. The aims of this study were to determine whether NO-induced ER stress (ERS) leads to apoptosis of chondrocytes and to investigate the temporal relationship between the expression of C/EBP-homologous protein (CHOP), an ERS-associated apoptotic molecule, and the expression of p53 during apoptosis in NO-stimulated chondrocytes. Rat chondrocytes were stimulated by sodium nitroprusside (SNP), a NO donor. Real-time polymerase chain reaction (PCR) was performed to analyze the mRNA expression of CHOP, glucose-regulated protein (GRP78) and p53. Apoptosis of chondrocytes was quantified using an enzyme-linked immunosorbent assay (ELISA). SNP-treated chondrocytes showed an increase in CHOP and GRP78 mRNA expression and underwent apoptosis. Sodium 4-phenylbutyrate (PBA), an ERS inhibitor, reduced CHOP and GRP78, as well as SNP-stimulated apoptosis of chondrocytes, without affecting the SNP-dependent generation of NO. In addition, the blockade of CHOP following siRNA transfection reduced SNP-induced apoptosis of chondrocytes. The CHOP expression increased after apoptosis was detected in the SNP-treated chondrocytes, whereas the p53 expression increased prior to apoptosis. These data demonstrated that NO-induced ERS leads chondrocytes to apoptosis, although this effect appears to be limited to persistent impairment of NO stimulation. These findings may provide insight into the pathology of cartilage degeneration.
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Affiliation(s)
- Koji Takada
- Department of Orthopaedic Surgery, Faculty of Life Sciences, Kumamoto University, Chuo-ku, Kumamoto 860-8556, Japan
| | - Jun Hirose
- Department of Orthopaedic Surgery, Faculty of Life Sciences, Kumamoto University, Chuo-ku, Kumamoto 860-8556, Japan
| | - Soichiro Yamabe
- Department of Orthopaedic Surgery, Faculty of Life Sciences, Kumamoto University, Chuo-ku, Kumamoto 860-8556, Japan
| | - Yushuke Uehara
- Department of Orthopaedic Surgery, Faculty of Life Sciences, Kumamoto University, Chuo-ku, Kumamoto 860-8556, Japan
| | - Hiroshi Mizuta
- Department of Orthopaedic Surgery, Faculty of Life Sciences, Kumamoto University, Chuo-ku, Kumamoto 860-8556, Japan
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Rasheed Z, Haqqi TM. Endoplasmic reticulum stress induces the expression of COX-2 through activation of eIF2α, p38-MAPK and NF-κB in advanced glycation end products stimulated human chondrocytes. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2012; 1823:2179-89. [PMID: 22982228 DOI: 10.1016/j.bbamcr.2012.08.021] [Citation(s) in RCA: 80] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/21/2012] [Revised: 08/11/2012] [Accepted: 08/29/2012] [Indexed: 11/25/2022]
Abstract
INTRODUCTION During aging, advanced glycation end products (AGEs) accumulate in articular cartilage. In this study we determined whether AGEs induce endoplasmic reticulum (ER) stress and studied the ER stress-activated pathways that stimulate cyclooxygenase-2 (COX-2) expression in human chondrocytes. METHODS Chondrocytes were stimulated with AGE-BSA. Gene expression was determined by quantitative PCR and protein expression was studied by immunoblotting. Studies to elucidate involved pathways were executed using siRNAs and specific inhibitors of eukaryotic initiation factor-2α (eIF2α), MAPKs and NF-κB. RESULTS AGE-BSA induced expression of GRP78 with concomitant increase in COX-2 expression was observed in human chondrocytes. In addition, expression of Bag-1, an ER stress marker was also increased by AGE-BSA. RAGE knockdown inhibited AGE-BSA-induced expression of GRP78 and COX-2. Treatment with eIF2α inhibitor or eIF2α knockdown inhibited AGE-BSA-induced expression of GRP78 and COX-2 with decreased PGE(2) production. Treatment with SB202190 inhibited AGE-BSA-induced expression of GRP78 and COX-2, while treatment with PD98051 inhibited AGE-BSA-induced GRP78 protein expression but had no effect on COX-2 protein expression. SP600125 had no effect on either GRP78 or COX-2 protein expression. Bay 11-7082 suppressed AGE-BSA-induced GRP78 and COX-2 expression. AGE-BSA-induced activation of NF-κB was inhibited by treatment with SB202190 and by eIF2α knockdown, but was not inhibited when chondrocytes were treated with SP600125 or PD98059. CONCLUSION This study demonstrates that AGEs induce ER stress and stimulate the expression of COX-2 through eIF2α, p38-MAPK and NF-κB pathways in human chondrocytes. Our results provide important insights into cartilage degradation in osteoarthritis associated with latent ER stress.
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Affiliation(s)
- Zafar Rasheed
- Department of Medicine, Division of Rheumatology, MetroHealth Medical Center, Cleveland, OH 44109, United States.
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Lombardi A, Ulianich L, Treglia AS, Nigro C, Parrillo L, Lofrumento DD, Nicolardi G, Garbi C, Beguinot F, Miele C, Di Jeso B. Increased hexosamine biosynthetic pathway flux dedifferentiates INS-1E cells and murine islets by an extracellular signal-regulated kinase (ERK)1/2-mediated signal transmission pathway. Diabetologia 2012; 55:141-53. [PMID: 22006246 DOI: 10.1007/s00125-011-2315-1] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/29/2011] [Accepted: 08/25/2011] [Indexed: 11/26/2022]
Abstract
AIMS/HYPOTHESIS Beta cell failure is caused by loss of cell mass, mostly by apoptosis, but also by simple dysfunction (decline of glucose-stimulated insulin secretion, downregulation of specific gene expression). Apoptosis and dysfunction are caused, at least in part, by lipoglucotoxicity. The mechanisms implicated are oxidative stress, increase in the hexosamine biosynthetic pathway (HBP) flux and endoplasmic reticulum (ER) stress. Oxidative stress plays a role in glucotoxicity-induced beta cell dedifferentiation, while glucotoxicity-induced ER stress has been mostly linked to beta cell apoptosis. We sought to clarify whether ER stress caused by increased HBP flux participates in a dedifferentiating response of beta cells, in the absence of relevant apoptosis. METHODS We used INS-1E cells and murine islets. We analysed the unfolded protein response and the expression profile of beta cells by real-time RT-PCR and western blot. The signal transmission pathway elicited by ER stress was investigated by real-time RT-PCR and immunofluorescence. RESULTS Glucosamine and high glucose induced ER stress, but did not decrease cell viability in INS-1E cells. ER stress caused dedifferentiation of beta cells, as shown by downregulation of beta cell markers and of the transcription factor, pancreatic and duodenal homeobox 1. Glucose-stimulated insulin secretion was inhibited. These effects were prevented by the chemical chaperone, 4-phenyl butyric acid. The extracellular signal-regulated kinase (ERK) signal transmission pathway was implicated, since its inhibition prevented the effects induced by glucosamine and high glucose. CONCLUSIONS/INTERPRETATION Glucotoxic ER stress dedifferentiates beta cells, in the absence of apoptosis, through a transcriptional response. These effects are mediated by the activation of ERK1/2.
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Affiliation(s)
- A Lombardi
- Dipartimento di Scienze e Tecnologie Biologiche e Ambientali, Università degli Studi del Salento, 73100 Lecce, Italy
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Ziskoven C, Jäger M, Zilkens C, Bloch W, Brixius K, Krauspe R. Oxidative stress in secondary osteoarthritis: from cartilage destruction to clinical presentation? Orthop Rev (Pavia) 2011; 2:e23. [PMID: 21808712 PMCID: PMC3143971 DOI: 10.4081/or.2010.e23] [Citation(s) in RCA: 72] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/21/2010] [Accepted: 11/29/2010] [Indexed: 12/21/2022] Open
Abstract
Due to an increasing life expectance, osteoarthritis (OA) is one of the most common chronic diseases. Although strong efforts have been made to regenerate degenerated joint cartilage, OA is a progressive and irreversible disease up to date. Among other factors the dysbalance between free radical burden and cellular scavenging mechanisms defined as oxidative stress is a relevant part of OA pathogenesis. Here, only little data are available about the mediation and interaction between different joint compartments. The article provides a review of the current literature regarding the influence of oxidative stress on cellular aging, senescence and apoptosis in different joint compartments (cartilage, synovial tissue and subchondral bone). Free radical exposure is known to promote cellular senescence and apoptosis. Radical oxygen species (ROS) involvement in inflammation, fibrosis control and pain nociception has been proven. The data from literature indicates a link between free radical burden and OA pathogenesis mediating local tissue reactions between the joint compartments. Hence, oxidative stress is likely not only to promote cartilage destruction but also to be involved in inflammative transformation, promoting the transition from clinically silent cartilage destruction to apparent OA. ROS induced by exogenous factors such as overload, trauma, local intraarticular lesion and consecutive synovial inflammation cause cartilage degradation. In the affected joint, free radicals mediate disease progression. The interrelationship between oxidative stress and OA etiology might provide a novel approach to the comprehension and therefore modification of disease progression and symptom control.
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Affiliation(s)
- Christoph Ziskoven
- Orthopedic Department, Heinrich-Heine University Medical School, Düsseldorf, Germany
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Pallet N. New insights on stress-induced epithelial phenotypic changes. Nephrol Dial Transplant 2011; 27:483-5. [DOI: 10.1093/ndt/gfr611] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
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