51
|
Zhang H, Li J, Li L, Liu P, Wei Y, Qian Z. Ceramide enhances COX-2 expression and VSMC contractile hyperreactivity via ER stress signal activation. Vascul Pharmacol 2017; 96-98:26-32. [PMID: 28797762 DOI: 10.1016/j.vph.2017.08.001] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2017] [Revised: 06/22/2017] [Accepted: 08/01/2017] [Indexed: 01/15/2023]
Abstract
Ceramide accumulation in blood vessels has been attributed to vascular dysfunction in progressive vascular complications in metabolic diseases. The present study showed that ceramide pretreatment promoted PE-induced vasoconstriction in rat endothelium-denuded vascular rings in a time- and dose-dependent manner. Endoplasmic reticulum (ER) stress inhibitors, 4-PBA and TUDCA, COX-2 inhibitors, Celecoxib and NS398, as well as PGE2 receptor antagonist AH-6809 attenuated ceramide-promoted vascular hyperreactivity. Ceramide promoted the transcriptional and translational expression of COX-2 and BiP in VSMCs, which were blocked by the ER stress inhibitors, 4-PBA and TUDCA. These findings show that ceramide enhances PE-induced vascular smooth muscle constriction by mediation of the ER stress/COX-2/PGE2 pathway. Therapeutic strategies targeted to reducing ER stress and COX-2 activation might be beneficial in attenuating vascular complications. CHEMICAL COMPOUNDS C2-Ceramide (N-acetyl-d-erythro-sphingosine) CID:2662 Tauroursodeoxycholic Acid Sodium (TUDCA) CID:9848818 phenylephrine (PE) CID:6041.
Collapse
Affiliation(s)
- Huina Zhang
- Beijing An Zhen Hospital, Capital Medical University, Key Laboratory of Upper Airway Dysfunction-related Cardiovascular Diseases, Beijing Institute of Heart Lung and Blood Vessel Disease, Beijing, China.
| | - Juanfen Li
- Department of Cardiovascular Medicine, Affiliated Hospital of Guilin Medical University, Guilin, Guangxi, China
| | - Linghai Li
- Department of Anesthesiology, Beijing Chest Hospital, Capital Medical University, Beijing Tuberculosis and Thoracic Tumor Research Institute, Beijing, China
| | - Pingsheng Liu
- National Laboratory of Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing, China
| | - Yongxiang Wei
- Beijing An Zhen Hospital, Capital Medical University, Key Laboratory of Upper Airway Dysfunction-related Cardiovascular Diseases, Beijing Institute of Heart Lung and Blood Vessel Disease, Beijing, China
| | - Zongjie Qian
- Department of Cardiovascular Medicine, Affiliated Hospital of Guilin Medical University, Guilin, Guangxi, China.
| |
Collapse
|
52
|
Gabr AA, Lee HJ, Onphachanh X, Jung YH, Kim JS, Chae CW, Han HJ. Ethanol-induced PGE 2 up-regulates Aβ production through PKA/CREB signaling pathway. Biochim Biophys Acta Mol Basis Dis 2017; 1863:2942-2953. [PMID: 28668332 DOI: 10.1016/j.bbadis.2017.06.020] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2017] [Revised: 06/07/2017] [Accepted: 06/25/2017] [Indexed: 11/27/2022]
Abstract
Ethanol abuse aggravates dementia-associated cognitive defects through the progression of Alzheimer's disease (AD) pathophysiology. Beta-site APP-cleaving enzyme 1 (BACE1) has been considered as a key regulator of AD pathogenesis by controlling amyloid beta peptide (Aβ) accumulation. In addition, previous studies reported that endoplasmic reticulum (ER) stress and neuroinflammation have been proposed in ethanol-induced neurodegeneration. Thus, we investigated the role of ER stress and PGE2, a neuroinflammation mediator, in the ethanol-stimulated BACE1 expression and Aβ production. Using the human-derived neuroblastoma cell line SK-N-MC, the results show that ethanol up-regulated BACE1 expression in a dose-dependent manner. Ethanol stimulated reactive oxygen species (ROS) production, which induced CHOP expression and eIF2α phosphorylation. PBA (an ER stress inhibitor) attenuated the ethanol-increased cyclooxygenase-2 (COX-2) expression and PGE2 production. By using salubrinal (an eIF2α dephosphorylation inhibitor) or EIF2A siRNA, we found that eIF2α phosphorylation mediated the ethanol-induced COX-2 expression. In addition, COX-2-induced BACE1 up-regulation was abolished by NS-398 (a selective COX-2 inhibitor). And, PF-04418948 (an EP-2 receptor inhibitor) pretreatment reduced ethanol-induced PKA activation and CREB phosphorylation as well as ethanol-stimulated Aβ production. Furthermore, 14-22 amide (a PKA inhibitor) pretreatment or CREB1 siRNA transfection suppressed the ethanol-induced BACE1 expression. In conclusion, ethanol-induced eIF2α phosphorylation stimulates COX-2 expression and PGE2 production which induces the BACE1 expression and Aβ production via EP-2 receptor-dependent PKA/CREB pathway.
Collapse
Affiliation(s)
- Amr Ahmed Gabr
- Department of Veterinary Physiology, College of Veterinary Medicine, Research Institute for Veterinary Science, Seoul National University, Seoul 08826, Republic of Korea; Department of Physiology, Faculty of Veterinary Medicine, Cairo University, Giza 12211, Egypt
| | - Hyun Jik Lee
- Department of Veterinary Physiology, College of Veterinary Medicine, Research Institute for Veterinary Science, Seoul National University, Seoul 08826, Republic of Korea; BK21 PLUS Program for Creative Veterinary Science Research Center, Seoul National University, Seoul 08826, Republic of Korea
| | - Xaykham Onphachanh
- Department of Veterinary Physiology, College of Veterinary Medicine, Research Institute for Veterinary Science, Seoul National University, Seoul 08826, Republic of Korea
| | - Young Hyun Jung
- Department of Veterinary Physiology, College of Veterinary Medicine, Research Institute for Veterinary Science, Seoul National University, Seoul 08826, Republic of Korea; BK21 PLUS Program for Creative Veterinary Science Research Center, Seoul National University, Seoul 08826, Republic of Korea
| | - Jun Sung Kim
- Department of Veterinary Physiology, College of Veterinary Medicine, Research Institute for Veterinary Science, Seoul National University, Seoul 08826, Republic of Korea; BK21 PLUS Program for Creative Veterinary Science Research Center, Seoul National University, Seoul 08826, Republic of Korea
| | - Chang Woo Chae
- Department of Veterinary Physiology, College of Veterinary Medicine, Research Institute for Veterinary Science, Seoul National University, Seoul 08826, Republic of Korea; BK21 PLUS Program for Creative Veterinary Science Research Center, Seoul National University, Seoul 08826, Republic of Korea
| | - Ho Jae Han
- Department of Veterinary Physiology, College of Veterinary Medicine, Research Institute for Veterinary Science, Seoul National University, Seoul 08826, Republic of Korea; BK21 PLUS Program for Creative Veterinary Science Research Center, Seoul National University, Seoul 08826, Republic of Korea.
| |
Collapse
|
53
|
Hughes A, Oxford AE, Tawara K, Jorcyk CL, Oxford JT. Endoplasmic Reticulum Stress and Unfolded Protein Response in Cartilage Pathophysiology; Contributing Factors to Apoptosis and Osteoarthritis. Int J Mol Sci 2017; 18:ijms18030665. [PMID: 28335520 PMCID: PMC5372677 DOI: 10.3390/ijms18030665] [Citation(s) in RCA: 72] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2017] [Revised: 03/15/2017] [Accepted: 03/16/2017] [Indexed: 12/11/2022] Open
Abstract
Chondrocytes of the growth plate undergo apoptosis during the process of endochondral ossification, as well as during the progression of osteoarthritis. Although the regulation of this process is not completely understood, alterations in the precisely orchestrated programmed cell death during development can have catastrophic results, as exemplified by several chondrodystrophies which are frequently accompanied by early onset osteoarthritis. Understanding the mechanisms that underlie chondrocyte apoptosis during endochondral ossification in the growth plate has the potential to impact the development of therapeutic applications for chondrodystrophies and associated early onset osteoarthritis. In recent years, several chondrodysplasias and collagenopathies have been recognized as protein-folding diseases that lead to endoplasmic reticulum stress, endoplasmic reticulum associated degradation, and the unfolded protein response. Under conditions of prolonged endoplasmic reticulum stress in which the protein folding load outweighs the folding capacity of the endoplasmic reticulum, cellular dysfunction and death often occur. However, unfolded protein response (UPR) signaling is also required for the normal maturation of chondrocytes and osteoblasts. Understanding how UPR signaling may contribute to cartilage pathophysiology is an essential step toward therapeutic modulation of skeletal disorders that lead to osteoarthritis.
Collapse
Affiliation(s)
- Alexandria Hughes
- Department of Biological Sciences, Boise State University, Boise, ID 83725, USA.
- Biomolecular Research Center, Boise State University, Boise, ID 83725, USA.
| | - Alexandra E Oxford
- Department of Biological Sciences, Boise State University, Boise, ID 83725, USA.
- Biomolecular Research Center, Boise State University, Boise, ID 83725, USA.
| | - Ken Tawara
- Biomolecular Sciences Graduate Program, Boise State University, Boise, ID 83725, USA.
- Biomolecular Research Center, Boise State University, Boise, ID 83725, USA.
| | - Cheryl L Jorcyk
- Department of Biological Sciences, Boise State University, Boise, ID 83725, USA.
- Biomolecular Sciences Graduate Program, Boise State University, Boise, ID 83725, USA.
- Biomolecular Research Center, Boise State University, Boise, ID 83725, USA.
| | - Julia Thom Oxford
- Department of Biological Sciences, Boise State University, Boise, ID 83725, USA.
- Biomolecular Sciences Graduate Program, Boise State University, Boise, ID 83725, USA.
- Biomolecular Research Center, Boise State University, Boise, ID 83725, USA.
| |
Collapse
|
54
|
TMF protects chondrocytes from ER stress-induced apoptosis by down-regulating GSK-3β. Biomed Pharmacother 2017; 89:1262-1268. [PMID: 28320093 DOI: 10.1016/j.biopha.2017.03.028] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2016] [Revised: 02/18/2017] [Accepted: 03/09/2017] [Indexed: 11/20/2022] Open
Abstract
Endoplasmic reticulum (ER) stress-induced chondrocyte apoptosis plays a critical role in osteoarthritis cartilage degeneration. Previous studies showed that 5,7,3',4'-tetramethoxyflavone (TMF) exhibited chondroprotective activity through inhibiting PGE2-induced ER stress and down regulating the expression of GSK-3β. To further investigate the role of GSK-3β in ER stress-induced chondrocytes apoptosis and the protective role of TMF, GSK-3β siRNA and pcDNA3.1-myc-GSK-3β were employed to knock down and overexpress GSK-3β, respectively, in chondrocytes. Results showed that TM-induced ER stress significantly promoted chondrocytes apoptosis. These could be effectively reversed by GSK-3β deficiency, while GSK-3β overexpression significantly up regulated ER stress and increased chondrocytes apoptosis. In addition, TMF down regulated the expression of GSK-3β and inhibited ER stress-induced chondrocytes apoptosis. Collectively, TMF is a potential natural compound with chondroprotective property through inhibition of ER stress-induced apoptosis with down regulation of GSK-3β.
Collapse
|
55
|
RAGE deficiency alleviates aortic valve calcification in ApoE −/− mice via the inhibition of endoplasmic reticulum stress. Biochim Biophys Acta Mol Basis Dis 2017; 1863:781-792. [DOI: 10.1016/j.bbadis.2016.12.012] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2016] [Revised: 12/22/2016] [Accepted: 12/23/2016] [Indexed: 02/07/2023]
|
56
|
Abstract
To generate new hypotheses, sometimes a "systems" approach is needed. In this review, I focus on the mitogen-activated kinase p38 because it has been recently shown to play an important role in the developmental programing and senescence of normal and stressed reproductive tissues. What follows is an overview of (i) pathways of p38 activation and their involvement in basic biological processes, (ii) evidence that p38 is involved in the homeostasis of reproductive tissues, (iii) how focus on p38 can be incorporated into investigation of normal and stressed pregnancies. Existence of excellent reviews will be mentioned as well as relevant animal models.
Collapse
Affiliation(s)
- Elizabeth A Bonney
- Department of Obstetrics, Gynecology and Reproductive Sciences, University of Vermont, Burlington, VT, USA
| |
Collapse
|
57
|
Rasheed Z, Rasheed N, Al-Shaya O. Epigallocatechin-3-O-gallate modulates global microRNA expression in interleukin-1β-stimulated human osteoarthritis chondrocytes: potential role of EGCG on negative co-regulation of microRNA-140-3p and ADAMTS5. Eur J Nutr 2017; 57:917-928. [PMID: 28110479 DOI: 10.1007/s00394-016-1375-x] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2016] [Accepted: 12/22/2016] [Indexed: 11/26/2022]
Abstract
PURPOSE MicroRNAs (miRNAs) are short, non-coding RNAs involved in almost all cellular processes. Epigallocatechin-3-O-gallate (EGCG) is a green tea polyphenol and is known to exert anti-arthritic effects by inhibiting genes associated with osteoarthritis (OA). This study was undertaken to investigate the global effect of EGCG on interleukin-1β (IL-1β)-induced expression of miRNAs in human chondrocytes. METHODS Human chondrocytes were derived from OA cartilage and then treated with EGCG and IL-1β. Human miRNA microarray technology was used to determine the expression profile of 1347 miRNAs. Microarray results were verified by taqman assays and transfection of chondrocytes with miRNA inhibitors. RESULTS Out of 1347 miRNAs, EGCG up-regulated expression of 19 miRNAs and down-regulated expression of 17 miRNAs, whereas expression of 1311 miRNAs remains unchanged in IL-1β-stimulated human OA chondrocytes. Bioinformatics approach showed that 3`UTR of ADAMTS5 mRNA contains the 'seed-matched-sequence' for hsa-miR-140-3p. IL-1β-induced expression of ADAMTS5 correlated with down-regulation of hsa-miR-140-3p. Importantly, EGCG inhibited IL-1β-induced ADAMTS5 expression and up-regulated the expression of hsa-miR-140-3p. This EGCG-induced co-regulation between ADAMTS5 and hsa-miR-140-3p becomes reversed in OA chondrocytes transfected with anti-miR-140-3p. CONCLUSIONS This study provides an important insight into the molecular basis of the reported anti-arthritic effects of EGCG. Our data indicate that the potential of EGCG in OA chondrocytes may be related to its ability to globally inhibit inflammatory response via modulation of miRNAs expressions.
Collapse
MESH Headings
- 3' Untranslated Regions
- ADAMTS5 Protein/antagonists & inhibitors
- ADAMTS5 Protein/chemistry
- ADAMTS5 Protein/genetics
- ADAMTS5 Protein/metabolism
- Anti-Inflammatory Agents, Non-Steroidal/metabolism
- Anti-Inflammatory Agents, Non-Steroidal/therapeutic use
- Base Sequence
- Cartilage, Articular/immunology
- Cartilage, Articular/metabolism
- Cartilage, Articular/pathology
- Catechin/analogs & derivatives
- Catechin/metabolism
- Catechin/therapeutic use
- Cells, Cultured
- Chondrocytes/immunology
- Chondrocytes/metabolism
- Chondrocytes/pathology
- Computational Biology
- Conserved Sequence
- Dietary Supplements
- Gene Expression Profiling
- Gene Expression Regulation
- Humans
- Interleukin-1beta/metabolism
- MicroRNAs/antagonists & inhibitors
- MicroRNAs/chemistry
- MicroRNAs/metabolism
- Oligonucleotide Array Sequence Analysis
- Osteoarthritis, Knee/diet therapy
- Osteoarthritis, Knee/immunology
- Osteoarthritis, Knee/metabolism
- Osteoarthritis, Knee/pathology
- RNA Interference
Collapse
Affiliation(s)
- Zafar Rasheed
- Department of Medical Biochemistry, College of Medicine, Qassim University, P.O. Box 6655, Buraidah, 51452, Saudi Arabia.
| | - Naila Rasheed
- Department of Medical Biochemistry, College of Medicine, Qassim University, P.O. Box 6655, Buraidah, 51452, Saudi Arabia
| | - Osama Al-Shaya
- Department of Orthopedics, King Fahd Medical City, Riyadh, Saudi Arabia
| |
Collapse
|
58
|
Courties A, Sellam J. Osteoarthritis and type 2 diabetes mellitus: What are the links? Diabetes Res Clin Pract 2016; 122:198-206. [PMID: 27889689 DOI: 10.1016/j.diabres.2016.10.021] [Citation(s) in RCA: 79] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/27/2016] [Accepted: 10/31/2016] [Indexed: 01/15/2023]
Abstract
Osteoarthritis (OA) is the most frequent joint disorder and one of the leading cause of disability. During a long time, it was considered as the consequence of aging and mechanical stress on cartilage. Recent advances in the knowledge of OA have highlighted that it is a whole joint disease with early modifications of synovium and subchondral bone but also that it is associated with obesity and metabolic syndrome through systemic mechanisms. In the past year, type 2 diabetes has been described in two meta-analyzes as an independent risk factor for OA. In vivo models of diabetes corroborated epidemiological studies. Indeed, diabetic rodents display a spontaneous and a more severe experimental OA than their non-diabetic counterparts, which can be partially prevented by diabetes treatment (insulin, pioglitazone). The negative impact of diabetes on joints could be explain by the induction of oxidative stress and pro-inflammatory cytokines but also by advanced age products accumulation in joint tissues exposed to chronic high glucose concentration. Insulin resistance might also impair joint tissue because of a local insulin resistance of diabetic synovial membrane but also by the systemic low grade inflammation state related to obesity and insulin resistant state.
Collapse
Affiliation(s)
- Alice Courties
- Rheumatology Department, Saint-Antoine Hospital, Assistance Publique-Hôpitaux de Paris (AP-HP), DHU i2B, Paris, France; Inserm UMR S_938, Sorbonne Universités Univ Paris 06, DHU i2B, Paris, France
| | - Jérémie Sellam
- Rheumatology Department, Saint-Antoine Hospital, Assistance Publique-Hôpitaux de Paris (AP-HP), DHU i2B, Paris, France; Inserm UMR S_938, Sorbonne Universités Univ Paris 06, DHU i2B, Paris, France.
| |
Collapse
|
59
|
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.
Collapse
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. ,
| |
Collapse
|
60
|
Micro RNA-146a expression, NF-κB/P65 activity and serum pentosidine levels as potential biomarkers for disease severity in primary knee osteoarthritis patients. EGYPTIAN RHEUMATOLOGIST 2016. [DOI: 10.1016/j.ejr.2016.02.001] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
|
61
|
Rasheed Z, Rasheed N, Al-Shobaili HA. Epigallocatechin-3-O-gallate up-regulates microRNA-199a-3p expression by down-regulating the expression of cyclooxygenase-2 in stimulated human osteoarthritis chondrocytes. J Cell Mol Med 2016; 20:2241-2248. [PMID: 27515563 PMCID: PMC5134388 DOI: 10.1111/jcmm.12897] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2016] [Accepted: 05/09/2016] [Indexed: 11/29/2022] Open
Abstract
Osteoarthritis (OA) is a most common form of arthritis worldwide leading to significant disability. MicroRNAs (miRNAs) are non‐coding RNAs involved in various aspects of cartilage development, homoeostasis and pathology. Several miRNAs have been identified which have shown to regulate expression of target genes relevant to OA pathogenesis such as matrix metalloproteinase (MMP)‐13, cyclooxygenase (COX)‐2, etc. Epigallocatechin‐3‐O‐gallate (EGCG), the most abundant and active polyphenol in green tea, has been reported to have anti‐arthritic effects, however, the role of EGCG in the regulation of miRNAs has not been investigated in OA. Here, we showed that EGCG inhibits COX‐2 mRNA/protein expression or prostaglandin E2 (PGE2) production via up‐regulating microRNA hsa‐miR‐199a‐3p expression in interleukin (IL)‐1β‐stimulated human OA chondrocytes. This negative co‐regulation of hsa‐miR‐199a‐3p and COX‐2 by EGCG was confirmed by transfection of OA chondrocytes with anti‐miR‐199a‐3p. Transfection of OA chondrocytes with anti‐miR‐199a‐3p significantly enhanced COX‐2 expression and PGE2 production (P < 0.001), while EGCG treatment significantly inhibited anti‐miR‐199a‐3p transfection‐induced COX‐2 expression or PGE2 production in a dose‐dependent manner. These results were further re‐validated by co‐treatment of these transfection OA chondrocytes with IL‐1β and EGCG. EGCG treatment consistently up‐regulated the IL‐1β‐decreased hsa‐miR‐199a‐3p expression (P < 0.05) and significantly inhibited the IL‐1β‐induced COX‐2 expression/PGE2 production (P < 0.05) in OA chondrocytes transfected with anti‐hsa‐miR‐199a‐3p. Taken together, these results clearly indicate that EGCG inhibits COX‐2 expression/PGE2 production via up‐regulation of hsa‐miR‐199a‐3p expression. These novel pharmacological actions of EGCG on IL‐1β‐stimulated human OA chondrocytes provide new suggestions that EGCG or EGCG‐derived compounds inhibit cartilage breakdown or pain by up‐regulating the expression of microRNAs in human chondrocytes.
Collapse
Affiliation(s)
- Zafar Rasheed
- Department of Medical Biochemistry, College of Medicine, Qassim University, Buraidah, Saudi Arabia
| | - Naila Rasheed
- Department of Medical Biochemistry, College of Medicine, Qassim University, Buraidah, Saudi Arabia
| | - Hani A Al-Shobaili
- Department of Dermatology, College of Medicine, Qassim University, Buraidah, Saudi Arabia
| |
Collapse
|
62
|
Parker S, May B, Zhang C, Zhang AL, Lu C, Xue CC. A Pharmacological Review of Bioactive Constituents ofPaeonia lactifloraPallas andPaeonia veitchiiLynch. Phytother Res 2016; 30:1445-73. [DOI: 10.1002/ptr.5653] [Citation(s) in RCA: 64] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2016] [Revised: 05/05/2016] [Accepted: 05/05/2016] [Indexed: 01/29/2023]
Affiliation(s)
- Shefton Parker
- China-Australia International Research Centre for Chinese Medicine, School of Health and Biomedical Sciences; RMIT University; PO Box 71 Bundoora Victoria 3083 Australia
| | - Brian May
- China-Australia International Research Centre for Chinese Medicine, School of Health and Biomedical Sciences; RMIT University; PO Box 71 Bundoora Victoria 3083 Australia
| | - Claire Zhang
- China-Australia International Research Centre for Chinese Medicine, School of Health and Biomedical Sciences; RMIT University; PO Box 71 Bundoora Victoria 3083 Australia
| | - Anthony Lin Zhang
- China-Australia International Research Centre for Chinese Medicine, School of Health and Biomedical Sciences; RMIT University; PO Box 71 Bundoora Victoria 3083 Australia
| | - Chuanjian Lu
- China-Australia International Research Centre for Chinese Medicine, School of Health and Biomedical Sciences; RMIT University; PO Box 71 Bundoora Victoria 3083 Australia
- Guangdong Provincial Hospital of Chinese Medicine; Guangzhou China
- Guangdong Provincial Academy of Chinese Medical Sciences; Guangzhou China
- The Second Clinical College; Guangzhou University of Chinese Medicine; Guangzhou China
| | - Charlie Changli Xue
- China-Australia International Research Centre for Chinese Medicine, School of Health and Biomedical Sciences; RMIT University; PO Box 71 Bundoora Victoria 3083 Australia
- Guangdong Provincial Hospital of Chinese Medicine; Guangzhou China
- Guangdong Provincial Academy of Chinese Medical Sciences; Guangzhou China
- The Second Clinical College; Guangzhou University of Chinese Medicine; Guangzhou China
| |
Collapse
|
63
|
Systemic effects of AGEs in ER stress induction in vivo. Glycoconj J 2016; 33:537-44. [PMID: 27236787 DOI: 10.1007/s10719-016-9680-4] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2016] [Revised: 04/18/2016] [Accepted: 05/17/2016] [Indexed: 12/26/2022]
Abstract
Emerging evidence indicates that accumulation of advanced glycation end products (AGEs) in human tissues may contribute to cell injury, inflammation and apoptosis through induction of endoplasmic reticulum (ER) stress. Human metabolism relies on ER homeostasis for the coordinated response of all metabolic organs by controlling the synthesis and catabolism of various nutrients. In vitro studies have demonstrated AGE-induced enhancement of unfolded protein response (UPR) in different cell types including endothelial, neuronal, pancreatic cells and podocytes, suggesting this crosstalk as an underlying pathological mechanism that contributes to metabolic diseases. In this minireview, we describe in vivo studies undertaken by our group and others that demonstrate the diverse systemic effects of AGEs in ER stress induction in major metabolic tissues such as brain, kidney, liver and pancreas of normal mice. Administration of high-AGEs content diet to normal mice for the period of 4 weeks upergulates the mRNA and protein levels of ER chaperone Bip (GRP78) indicative of UPR initiation in all major metabolic organs and induces activation of the pivotal transcription factor XBP1 that regulates glucose and lipid metabolism. Furthermore, animals with genetic ablation of UPR-activated transcription factor C/EBP homologous protein CHOP allocated in high-AGEs diet, exhibited relative resistance to UPR induction (BiP levels) and XBP1 activation in major metabolic organs. Since CHOP presents a critical mediator that links accumulation and aggregation of unfolded proteins with induction of oxidative stress and ER stress-related apoptosis, it is revealed as an important molecular target for the management of metabolic diseases.
Collapse
|
64
|
Ohara H, Nabika T. A nonsense mutation of Stim1 identified in stroke-prone spontaneously hypertensive rats decreased the store-operated calcium entry in astrocytes. Biochem Biophys Res Commun 2016; 476:406-411. [PMID: 27237974 DOI: 10.1016/j.bbrc.2016.05.134] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2016] [Accepted: 05/25/2016] [Indexed: 10/21/2022]
Abstract
We previously identified a nonsense mutation in the stromal interaction molecule-1 (Stim1) resulting in expression of a truncated STIM1 in the stroke-prone spontaneously hypertensive rat (SHRSP). In this study, we evaluated activity of the store-operated Ca(2+)-entry (SOCE) regulated by STIM1 to clarify putative functional abnormalities of the truncated STIM1. As a result, reduced SOCE activity resulting in suppression of cyclooxygenase-2 expression induced by SOCE was found in cultured astrocytes with the truncated STIM1 when compared with those with the wild-type. Our results indicated that the truncated STIM1 impaired Ca(2+) signaling regulated by SOCE and that the impaired SOCE activity might be responsible for pathological phenotypes in SHRSP.
Collapse
Affiliation(s)
- Hiroki Ohara
- Department of Functional Pathology, Shimane University Faculty of Medicine, 89-1 Enya-cho, Izumo, Shimane 693-8501, Japan.
| | - Toru Nabika
- Department of Functional Pathology, Shimane University Faculty of Medicine, 89-1 Enya-cho, Izumo, Shimane 693-8501, Japan
| |
Collapse
|
65
|
Woo SM, Lee WK, Min KJ, Kim DE, Park SH, Nam SI, Kwon TK. Rottlerin induces cyclooxygenase-2 upregulation through an ATF4 and reactive oxygen species-independent pathway in HEI-OC1 cells. Mol Med Rep 2016; 14:845-50. [PMID: 27222046 DOI: 10.3892/mmr.2016.5320] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2015] [Accepted: 04/29/2016] [Indexed: 11/06/2022] Open
Abstract
Hearing loss can be caused by infection, inflammation, loud noise and ototoxic drugs. The induction of cyclooxygenase-2 (COX‑2) expression is an important event during the cellular inflammatory response. The present study investigated the effect of rottlerin on CO-2 mRNA and protein expression in HEI-OC1 cells. Cell viability was determined using an MTT assay. Western blotting was used to examine the expression of COX‑2, endoplasmic reticulum stress-associated transcription factors and activation of the MAPK pathway. ROS was measured using the fluorescent probe 2', 7'-dichlorodihydrofluorescein diacetate. Treatment with the natural protein kinase C δ inhibitor, rottlerin, was shown to increase COX‑2 expression at the protein and mRNA levels in a dose‑dependent manner. Rottlerin was shown to induce increased reactive oxygen species (ROS) generation, however, ROS were not critical for rottlerin‑induced upregulation of COX‑2 expression in HEI‑OC1 cells. In addition, rottlerin was shown to increase the phosphorylation of p38 mitogen-activated protein kinase (MAPK). The pharmacological inhibition of p38MAPK and suppression of activating transcription factor 4 (an ER stress‑associated transcription factor) expression by small interfering RNA inhibited rottlerin-induced COX‑2 upregulation. Furthermore, COX‑2 expression levels were increased further when cells were treated with rottlerin and interleukin‑1β or protein kinase C activator, PMA. In conclusion, the results of the present study demonstrated that rottlerin is a novel inducer of COX‑2 expression and identified the mechanisms involved in this process. Rottlerin may be considered a potential activator of repair and remodeling.
Collapse
Affiliation(s)
- Seon Min Woo
- Department of Immunology, School of Medicine, Keimyung University, Daegu 700712, Republic of Korea
| | - Woo Keun Lee
- Department of Otolaryngology, School of Medicine, Keimyung University, Daegu 700712, Republic of Korea
| | - Kyoung-Jin Min
- Department of Immunology, School of Medicine, Keimyung University, Daegu 700712, Republic of Korea
| | - Dong Eun Kim
- Department of Otolaryngology, School of Medicine, Keimyung University, Daegu 700712, Republic of Korea
| | - Soon Hyung Park
- Department of Otolaryngology, School of Medicine, Keimyung University, Daegu 700712, Republic of Korea
| | - Sung Il Nam
- Department of Otolaryngology, School of Medicine, Keimyung University, Daegu 700712, Republic of Korea
| | - Taeg Kyu Kwon
- Department of Immunology, School of Medicine, Keimyung University, Daegu 700712, Republic of Korea
| |
Collapse
|
66
|
Rasheed Z, Al-Shobaili HA, Rasheed N, Al Salloom AAM, Al-Shaya O, Mahmood A, Alajez NM, Alghamdi ASS, Mehana ESE. Integrated Study of Globally Expressed microRNAs in IL-1β-stimulated Human Osteoarthritis Chondrocytes and Osteoarthritis Relevant Genes: A Microarray and Bioinformatics Analysis. NUCLEOSIDES NUCLEOTIDES & NUCLEIC ACIDS 2016; 35:335-55. [PMID: 27152662 DOI: 10.1080/15257770.2016.1163380] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
This study was undertaken to identify and characterize the globally expressed microRNAs (miRNAs) involved in interleukin-1β (IL-1β)-induced joint damage and to predict whether miRNAs can regulate the catabolic effects in osteoarthritis (OA) chondrocytes. Out of 1347 miRNAs analyzed by microarrays in IL-1β-stimulated OA chondrocytes, 35 miRNAs were down-regulated, 1 miRNA was up-regulated, and the expression of 1311 miRNAs remained unchanged. Bioinformatics analysis showed the key inflammatory mediators and key molecular pathways are targeted by differentially expressed miRNAs. Novel miRNAs identified could have important diagnostic and therapeutic potentials in the development of novel therapeutic strategies for pain managements in OA.
Collapse
Affiliation(s)
- Zafar Rasheed
- a Department of Medical Biochemistry , College of Medicine, Qassim University , Buraidah , KSA
| | - Hani A Al-Shobaili
- b Department of Dermatology , College of Medicine, Qassim University , Buraidah , KSA
| | - Naila Rasheed
- a Department of Medical Biochemistry , College of Medicine, Qassim University , Buraidah , KSA
| | | | - Osama Al-Shaya
- d Department of Orthopedics , King Fahd Medical City , Riyadh , KSA
| | - Amer Mahmood
- e Stem Cell Unit , Department of Anatomy, College of Medicine, King Saud University , Riyadh , KSA
| | - Nehad M Alajez
- e Stem Cell Unit , Department of Anatomy, College of Medicine, King Saud University , Riyadh , KSA
| | | | - El-Sayed E Mehana
- c Department of Pathology , College of Medicine, Qassim University , Buraidah , KSA
| |
Collapse
|
67
|
Rasheed Z. Intake of Pomegranate Prevents the Onset of Osteoarthritis: Molecular Evidences. Int J Health Sci (Qassim) 2016; 10:V-VIII. [PMID: 27103912 PMCID: PMC4825888] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/05/2023] Open
Affiliation(s)
- Zafar Rasheed
- Correspondence: Zafar Rasheed, MS., Ph.D., PGDCA., Section Editor, International Journal of Health Sciences., Department of Medical Biochemistry, College of Medicine, Qassim University, P.O. Box 6655, Buraidah-51452, Saudi Arabia.
| |
Collapse
|
68
|
Rasheed N, Alghasham A, Rasheed Z. Lactoferrin from Camelus dromedarius Inhibits Nuclear Transcription Factor-kappa B Activation, Cyclooxygenase-2 Expression and Prostaglandin E2 Production in Stimulated Human Chondrocytes. Pharmacognosy Res 2016; 8:135-41. [PMID: 27034605 PMCID: PMC4780140 DOI: 10.4103/0974-8490.175612] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
Background: Osteoarthritis (OA) is a progressive joint disorder, which remains the leading cause of chronic disability in aged people. Nuclear factor-kappa B (NF)-κB is a major cellular event in OA and its activation by interleukin-1β (IL-1β) plays a critical role in cartilage breakdown in these patients. Objective: In this study, we examined the effect of lactoferrin on NF-κB activation, cyclooxygenase-2 (COX-2) expression and prostaglandin E2 (PGE2) production in stimulated human articular chondrocytes. Materials and Methods: Human chondrocytes were derived from OA articular cartilage and treated with camel lactoferrin and then stimulated with IL-1β. Gene expression was determined by TaqMan assays and protein expression was studied by Western immunoblotting. NF-κB activity and PGE2 levels were determined by ELISA based assays. NF-κB activity was also determined by treatment of chondrocytes with NF-κB specific inhibitor Bay 11–7082. Results: Lactoferrin inhibited IL-1β-induced activation and nuclear translocation of NF-κB p65 in human OA chondrocytes. Lactoferrin also inhibited mRNA/protein expression of COX-2 and production of PGE2. Moreover, Bay 11–7082 also inhibited IL-1β-induced expression of COX-2 and production of PGE2. The inhibitory effect of lactoferrin on the IL-1β induced expression of COX-2 or production of PGE2 was mediated at least in part via suppression of NF-κB activation. Conclusions: Our data determine camel lactoferrin as a novel inhibitor of IL-1β-induced activation of NF-κB signaling events and production of cartilage-degrading molecule PGE2 via inhibition of COX-2 expressions. These results may have important implications for the development of novel therapeutic strategies for the prevention/treatment of OA and other degenerative/inflammatory diseases. SUMMARY Lactoferrin shows anti-arthritic activity in IL-1β stimulated primary human chondrocytes. Lactoferrin inhibits IL-1β-induced NF-κB activation. Lactoferrin inhibits production of cartilage degrading PGE2 via inhibition of COX-2 expression.
Abbreviations Used: OA: Osteoarthritis IL-1β: Interleukin-1 beta NF-κB: Nuclear factor-kappa B COX-2: cyclooxygenase-2 PGE2: prostaglandin E2
Collapse
Affiliation(s)
- Naila Rasheed
- Department of Medical Biochemistry, College of Medicine, Qassim University, Buraidah, Saudi Arabia
| | - Abdullah Alghasham
- Department of Pharmacology and Therapeutics, College of Medicine, Qassim University, Buraidah, KSA
| | - Zafar Rasheed
- Department of Medical Biochemistry, College of Medicine, Qassim University, Buraidah, Saudi Arabia
| |
Collapse
|
69
|
Alzolibani AA, Rasheed Z, Saif GB, Al-Dhubaibi MS, Al Robaee AA. Altered expression of intracellular Toll-like receptors in peripheral blood mononuclear cells from patients with alopecia areata. BBA CLINICAL 2016; 5:134-42. [PMID: 27114923 PMCID: PMC4826589 DOI: 10.1016/j.bbacli.2016.03.006] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/25/2016] [Revised: 03/09/2016] [Accepted: 03/11/2016] [Indexed: 11/17/2022]
Abstract
BACKGROUND Toll-like receptors (TLRs) are pattern-recognition-receptors that sense a variety of pathogens and initiation of innate and adaptive immune responses. This study was undertaken to investigate the expression of TLRs in peripheral blood-mononuclear cells (PBMCs) of AA patients and to determine whether TLR-mediated inflammatory signals are important for the perspective of AA management. METHODS Gene expression of TLRs and T-helper (Th) type-1, Th-2, Th-17 and regulatory T-cell cytokines in PBMCs was quantified by TaqMan Assays. Production of these cytokines in serum samples was determined by sandwich ELISAs. RESULTS All TLRs (TLRs 1-10) were expressed in PBMCs of AA patients. Importantly intracellular TLRs (TLRs 3, 7, 8 and 9) were significantly up-regulated in AA patients as compared with controls (p < 0.05). Interleukin (IL)-2, TNF-α, and IL-17A gene expression in patients' PBMCs and their secretion in patients' sera were significantly higher as compared with their respective controls (p < 0.05). Whereas, TGF-β gene expression in patients' PBMCs and TGF-β protein level in patients' sera were significantly lower as compared with their controls (p < 0.05). CONCLUSION This is the first report that shows the comprehensive expression profile of TLRs in AA patients. We conclude that up-regulated expression of intracellular TLRs in PBMCs of AA patients may play an active role in abnormal regulation of Th-1, Th-17 and regulatory T-cell cytokines in alopecia areata. GENERAL SIGNIFICANCE Targeting of TLRs and their associated inflammatory signaling will open new areas of research; this may lead to the development of novel therapeutic targets for the treatment of AA or other skin disorders.
Collapse
Affiliation(s)
| | - Zafar Rasheed
- Department of Medical Biochemistry, College of Medicine, Qassim University, Buraidah, Saudi Arabia
- Corresponding author at: Department of Medical Biochemistry, College of Medicine, Qassim University, P.O. Box 6655, Buraidah 51452, Saudi Arabia.Department of Medical BiochemistryCollege of MedicineQassim UniversityP.O. Box 6655Buraidah51452Saudi Arabia
| | - Ghada Bin Saif
- Department of Dermatology, College of Medicine, King Saud University, Riyadh, Saudi Arabia
| | | | - Ahmad A. Al Robaee
- Department of Dermatology, College of Medicine, Qassim University, Buraidah, Saudi Arabia
| |
Collapse
|
70
|
Rasheed Z, Al-Shobaili HA, Rasheed N, Mahmood A, Khan MI. MicroRNA-26a-5p regulates the expression of inducible nitric oxide synthase via activation of NF-κB pathway in human osteoarthritis chondrocytes. Arch Biochem Biophys 2016; 594:61-7. [DOI: 10.1016/j.abb.2016.02.003] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2015] [Revised: 01/14/2016] [Accepted: 02/01/2016] [Indexed: 12/13/2022]
|
71
|
Maltais JS, Simard E, Froehlich U, Denault JB, Gendron L, Grandbois M. iRAGE as a novel carboxymethylated peptide that prevents advanced glycation end product-induced apoptosis and endoplasmic reticulum stress in vascular smooth muscle cells. Pharmacol Res 2015; 104:176-85. [PMID: 26707030 DOI: 10.1016/j.phrs.2015.12.015] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/25/2015] [Revised: 11/06/2015] [Accepted: 12/15/2015] [Indexed: 01/11/2023]
Abstract
Advanced glycation end-products (AGE) and the receptor for AGE (RAGE) have been linked to numerous diabetic vascular complications. RAGE activation promotes a self-sustaining state of chronic inflammation and has been shown to induce apoptosis in various cell types. Although previous studies in vascular smooth muscle cells (VSMC) showed that RAGE activation increases vascular calcification and interferes with their contractile phenotype, little is known on the potential of RAGE to induce apoptosis in VSMC. Using a combination of apoptotic assays, we showed that RAGE stimulation with its ligand CML-HSA promotes apoptosis of VSMC. The formation of stress granules and the increase in the level of the associated protein HuR point toward RAGE-dependent endoplasmic reticulum (ER) stress, which is proposed as a key contributor of RAGE-induced apoptosis in VSMC as it has been shown to promote cell death via numerous mechanisms, including up-regulation of caspase-9. Chronic NF-κB activation and modulation of Bcl-2 homologs are also suspected to contribute to RAGE-dependent apoptosis in VSMC. With the goal of reducing RAGE signaling and its detrimental impact on VSMC, we designed a RAGE antagonist (iRAGE) derived from the primary amino acid sequence of HSA. The resulting CML peptide was selected for the high glycation frequency of the primary sequence in the native protein in vivo. Pretreatment with iRAGE blocked 69.6% of the increase in NF-κB signaling caused by RAGE activation with CML-HSA after 48h. Preincubation with iRAGE was successful in reducing RAGE-induced apoptosis, as seen through enhanced cell survival by SPR and reduced PARP cleavage. Activation of executioner caspases was 63.5% lower in cells treated with iRAGE before stimulation with CML-HSA. To our knowledge, iRAGE is the first antagonist shown to block AGE-RAGE interaction and we propose the molecule as an initial candidate for drug discovery.
Collapse
Affiliation(s)
- Jean-Sébastien Maltais
- Département de pharmacologie et physiologie, Faculté de médecine et des sciences de la santé, Université de Sherbrooke, 3001 12e Avenue Nord, Sherbrooke, Québec J1H 5N4, Canada
| | - Elie Simard
- Département de pharmacologie et physiologie, Faculté de médecine et des sciences de la santé, Université de Sherbrooke, 3001 12e Avenue Nord, Sherbrooke, Québec J1H 5N4, Canada
| | - Ulrike Froehlich
- Département de pharmacologie et physiologie, Faculté de médecine et des sciences de la santé, Université de Sherbrooke, 3001 12e Avenue Nord, Sherbrooke, Québec J1H 5N4, Canada
| | - Jean-Bernard Denault
- Département de pharmacologie et physiologie, Faculté de médecine et des sciences de la santé, Université de Sherbrooke, 3001 12e Avenue Nord, Sherbrooke, Québec J1H 5N4, Canada
| | - Louis Gendron
- Département de pharmacologie et physiologie, Faculté de médecine et des sciences de la santé, Université de Sherbrooke, 3001 12e Avenue Nord, Sherbrooke, Québec J1H 5N4, Canada
| | - Michel Grandbois
- Département de pharmacologie et physiologie, Faculté de médecine et des sciences de la santé, Université de Sherbrooke, 3001 12e Avenue Nord, Sherbrooke, Québec J1H 5N4, Canada.
| |
Collapse
|
72
|
Inflammation and intracellular metabolism: new targets in OA. Osteoarthritis Cartilage 2015; 23:1835-42. [PMID: 26521729 PMCID: PMC4668929 DOI: 10.1016/j.joca.2014.12.016] [Citation(s) in RCA: 73] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/12/2014] [Accepted: 12/17/2014] [Indexed: 02/02/2023]
Abstract
Articular cartilage degeneration is hallmark of osteoarthritis (OA). Low-grade chronic inflammation in the joint can promote OA progression. Emerging evidence indicates that bioenergy sensors couple metabolism with inflammation to switch physiological and clinical phenotypes. Changes in cellular bioenergy metabolism can reprogram inflammatory responses, and inflammation can disturb cellular energy balance and increase cell stress. AMP-activated protein kinase (AMPK) and sirtuin 1 (SIRT1) are two critical bioenergy sensors that regulate energy balance at both cellular and whole-body levels. Dysregulation of AMPK and SIRT1 has been implicated in diverse human diseases and aging. This review reveals recent findings on the role of AMPK and SIRT1 in joint tissue homeostasis and OA, with a focus on how AMPK and SIRT1 in articular chondrocytes modulate intracellular energy metabolism during stress responses (e.g., inflammatory responses) and how these changes dictate specific effector functions, and discusses translational significance of AMPK and SIRT1 as new therapeutic targets for OA.
Collapse
|
73
|
Metabolic stress-induced joint inflammation and osteoarthritis. Osteoarthritis Cartilage 2015; 23:1955-65. [PMID: 26033164 DOI: 10.1016/j.joca.2015.05.016] [Citation(s) in RCA: 138] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/08/2015] [Revised: 04/20/2015] [Accepted: 05/20/2015] [Indexed: 02/02/2023]
Abstract
Osteoarthritis (OA) is a heterogeneous disorder with several risk factors. Among them, obesity has a major impact on both loading and non-loading joints. Mechanical overload and activity of systemic inflammatory mediators derived from adipose tissue (adipokines, free fatty acids (FFA), reactive oxygen species (ROS)) provide clues to the increased incidence and prevalence of OA in obesity. Recently, research found greater OA prevalence and incidence in obese patients with cardiometabolic disturbances than "healthy" obese patients, which led to the description of a new OA phenotype - metabolic syndrome (MetS)-associated OA. Indeed, individual metabolic factors (diabetes, dyslipidemia, and hypertension) may increase the risk of obesity-induced OA. This review discusses hypotheses based on pathways specific to a metabolic factor in MetS-associated OA, such as the role of advanced glycation end products (AGEs) and glucose toxicity. A better understanding of these phenotypes based on risk factors will be critical for designing trials of this specific subset of OA.
Collapse
|
74
|
Modulation of the xenobiotic transformation system and inflammatory response by ochratoxin A exposure using a co-culture system of Caco-2 and HepG2 cells. Food Chem Toxicol 2015; 86:245-52. [PMID: 26505656 DOI: 10.1016/j.fct.2015.10.007] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2015] [Revised: 09/21/2015] [Accepted: 10/13/2015] [Indexed: 12/28/2022]
Abstract
Cytotoxicity of ochratoxin A (OTA) was evaluated using the MTS assay, and membrane integrity was measured using transepithelial electrical resistance (TEER). A transwell system was used to investigate the effect of OTA on the expression of the CYP450 (1A1, 2A6, 2B6, 3A4 and 3A5), NAT2, COX-2, LOX-5, and MRP2 genes in Caco-2 and HepG2 cells. TEER decreased by a mean of 63.2% after 24 h in Caco-2 differentiated cells without inducing cell detachment; revealing damage to the intestinal epithelial cell tight junction proteins and an increase in cell permeability. Gene expression analysis showed that modulation of gene expression by OTA was higher in Caco-2 cells than in HepG2 cells, and generally, the duration of exposure to OTA had a more significant effect than the OTA dose. A general OTA down-regulation effect was observed in Caco-2 cells, in contrast with the down- and up-regulation observed in HepG2 cells. In Caco-2 cells, CYP1A1 was the gene with the highest regulation, followed by CYP3A4 and CYP3A5. Conversely, in HepG2 cells, CYP2B6 was highly regulated at 3 and 12 h compared to the other cytochromes; CYP1A1 was slightly modulated during the first 12 h, but an overexpression was observed at 24 h. Our data support the involvement of the COX-2 and 5-LOX genes in liver metabolism of OTA. On the basis of the gene expression analysis, the results suggest a possible impairment in OTA secretion at the intestinal and hepatic level due to MRP2 repression. In addition, we provide evidence of the effect of OTA on NAT2 gene expression, which had not been reported before.
Collapse
|
75
|
The Chondroprotective Role of TMF in PGE2-Induced Apoptosis Associating with Endoplasmic Reticulum Stress. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2015; 2015:297423. [PMID: 26435723 PMCID: PMC4576019 DOI: 10.1155/2015/297423] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/28/2015] [Revised: 07/21/2015] [Accepted: 08/25/2015] [Indexed: 12/23/2022]
Abstract
Endoplasmic reticulum stress (ERS) has been demonstrated to exhibit a critical role in osteoarthritic chondrocytes. Whether 5,7,3′,4′-tetramethoxyflavone (TMF) plays the chondroprotective role in inhibition of PGE2-induced chondrocytes apoptosis associating with ERS has not been reported. To investigate this, the activation of PERK, ATF6, and IRE1 signaling pathways in ERS in chondrocytes pretreated with PGE2 was studied. By treatment with PGE2, the chondrocytes apoptosis was significantly increased, the proapoptotic CHOP and JNK were upregulated, the prosurvival GRP78 and XBP1 were downregulated, and GSK-3β was also upregulated. However, TMF exhibited the effectively protective functions via counteracting these detrimental effects of PGE2. Finally, the inflammatory cytokine PGE2 can activate ERS signaling and promote chondrocytes apoptosis, which might be associated with upregulation of GSK-3β. TMF exhibits a chondroprotective role in inhibiting PGE2-induced ERS and GSK-3β.
Collapse
|
76
|
Onodera Y, Teramura T, Takehara T, Shigi K, Fukuda K. Reactive oxygen species induce Cox-2 expression via TAK1 activation in synovial fibroblast cells. FEBS Open Bio 2015; 5:492-501. [PMID: 26110105 PMCID: PMC4476901 DOI: 10.1016/j.fob.2015.06.001] [Citation(s) in RCA: 89] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2015] [Revised: 05/15/2015] [Accepted: 06/02/2015] [Indexed: 11/05/2022] Open
Abstract
Oxidative stress in the arthritis joint is involved in generating mediators for inflammation. Oxidative stress-induced expression of Cox-2 was mediated by MAPKs and NF-κB. ROS-induced MAPKs and NF-κB were attenuated by inhibition of MAPKKK TAK1. Inhibition of TAK1 activity resulted in reduced expression of Cox-2 and PGE2. ROS-induced TAK1 activation and Cox-2 expression was inhibited by antioxidants N-acetyl cysteamine and hyaluronic acid.
Oxidative stress within the arthritis joint has been indicated to be involved in generating mediators for tissue degeneration and inflammation. COX-2 is a mediator in inflammatory action, pain and some catabolic reactions in inflamed tissues. Here, we demonstrated a direct relationship between oxidative stress and Cox-2 expression in the bovine synovial fibroblasts. Furthermore, we elucidated a novel mechanism, in which oxidative stress induced phosphorylation of MAPKs and NF-κB through TAK1 activation and resulted in increased Cox-2 and prostaglandin E2 expression. Finally, we demonstrated that ROS-induced Cox-2 expression was inhibited by supplementation of an antioxidant such as N-acetyl cysteamine and hyaluronic acid in vitro and in vivo. From these results, we conclude that oxidative stress is an important factor for generation of Cox-2 in synovial fibroblasts and thus its neutralization may be an effective strategy in palliative therapy for chronic joint diseases.
Collapse
Affiliation(s)
- Yuta Onodera
- Division of Cell Biology for Regenerative Medicine, Institute of Advanced Clinical Medicine, Kindai University Faculty of Medicine, Osaka, Japan
| | - Takeshi Teramura
- Division of Cell Biology for Regenerative Medicine, Institute of Advanced Clinical Medicine, Kindai University Faculty of Medicine, Osaka, Japan
| | - Toshiyuki Takehara
- Division of Cell Biology for Regenerative Medicine, Institute of Advanced Clinical Medicine, Kindai University Faculty of Medicine, Osaka, Japan
| | - Kanae Shigi
- Division of Cell Biology for Regenerative Medicine, Institute of Advanced Clinical Medicine, Kindai University Faculty of Medicine, Osaka, Japan
| | - Kanji Fukuda
- Division of Cell Biology for Regenerative Medicine, Institute of Advanced Clinical Medicine, Kindai University Faculty of Medicine, Osaka, Japan
| |
Collapse
|
77
|
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.
Collapse
Affiliation(s)
- Seon Min Woo
- Department of Immunology, School of Medicine, Keimyung University, Dalseo-Gu, Daegu, South Korea
| | | | | |
Collapse
|
78
|
Chen YJ, Chan DC, Lan KC, Wang CC, Chen CM, Chao SC, Tsai KS, Yang RS, Liu SH. PPARγ is involved in the hyperglycemia-induced inflammatory responses and collagen degradation in human chondrocytes and diabetic mouse cartilages. J Orthop Res 2015; 33:373-81. [PMID: 25410618 DOI: 10.1002/jor.22770] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/26/2014] [Accepted: 10/11/2014] [Indexed: 02/04/2023]
Abstract
Diabetic hyperglycemia has been suggested to play a role in osteoarthritis. Peroxisome proliferator-activated receptor-γ (PPARγ) was implicated in several pathological conditions including diabetes and inflammation. The detailed effects and mechanisms of hyperglycemia on cartilage damage still need to be clarified. Here, we investigated the role of PPARγ in hyperglycemia-triggered chondrocyte/cartilage damages using a human chondrocyte culture model and a diabetic mouse model. Human chondrocytes were cultured and treated with high concentration of glucose (30 mM) to mimic hyperglycemia in the presence or absence of pioglitazone, a PPARγ agonist. Streptozotocin (STZ) was used to induce mouse diabetes. Our data showed that high glucose induced the protein expressions of cyclooxygenase-2 (COX-2) and production of prostaglandin-E2 (PGE2 ), interleukin-6 (IL-6), and metalloproteinase-13 (MMP-13), but decreased the protein expression of collagen II and PPARγ in human chondrocytes. These alterations in high glucose-treated human chondrocytes could be reversed by pioglitazone in a dose-dependent manner. Moreover, pioglitazone administration could also significantly reverse the hyperglycemia, formation of AGEs, productions of IL-6 and MMP-13, and cartilage damage in STZ-induced diabetic mice. Taken together, these findings suggest that hyperglycemia down-regulates PPARγ expression and induces inflammatory and catabolic responses in human chondrocytes and diabetic mouse cartilages.
Collapse
Affiliation(s)
- Ying-Ju Chen
- Institute of Toxicology, College of Medicine, National Taiwan University, Taipei, Taiwan
| | | | | | | | | | | | | | | | | |
Collapse
|
79
|
Yang Q, Guo S, Wang S, Qian Y, Tai H, Chen Z. Advanced glycation end products-induced chondrocyte apoptosis through mitochondrial dysfunction in cultured rabbit chondrocyte. Fundam Clin Pharmacol 2014; 29:54-61. [PMID: 25283343 DOI: 10.1111/fcp.12094] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2013] [Revised: 03/27/2014] [Accepted: 10/01/2014] [Indexed: 11/30/2022]
Affiliation(s)
- Qingshan Yang
- Department of Orthopaedics; Gan Su Province Hospital; Lan Zhou 73000 China
| | - Shifang Guo
- Department of Orthopaedics; Gan Su Province Hospital; Lan Zhou 73000 China
| | - Song Wang
- Department of Orthopaedics; Gan Su Province Hospital; Lan Zhou 73000 China
| | - Yaowen Qian
- Department of Orthopaedics; Gan Su Province Hospital; Lan Zhou 73000 China
| | - Huiping Tai
- Department of Orthopaedics; Gan Su Province Hospital; Lan Zhou 73000 China
| | - Zhixin Chen
- Department of Orthopaedics; Gan Su Province Hospital; Lan Zhou 73000 China
| |
Collapse
|
80
|
Lamy S, Moldovan PL, Ben Saad A, Annabi B. Biphasic effects of luteolin on interleukin-1β-induced cyclooxygenase-2 expression in glioblastoma cells. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2014; 1853:126-35. [PMID: 25409926 DOI: 10.1016/j.bbamcr.2014.10.010] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/28/2014] [Revised: 10/10/2014] [Accepted: 10/13/2014] [Indexed: 01/16/2023]
Abstract
Success in developing therapeutic approaches to target brain tumor-associated inflammation in patients has been limited. Given that the inflammatory microenvironment is a hallmark signature of solid tumor development, anti-inflammatory targeting strategies have been envisioned as preventing glioblastoma initiation or progression. Consumption of foods from plant origin is associated with reduced risk of developing cancers, a chemopreventive effect that is, in part, attributed to their high content of phytochemicals with potent anti-inflammatory properties. We explored whether luteolin, a common flavonoid in many types of plants, may inhibit interleukin (IL)-1β function induction of the inflammation biomarker cyclooxygenase (COX)-2. We found that IL-1β triggered COX-2 expression in U-87 glioblastoma cells and synergized with luteolin to potentiate or inhibit that induction in a biphasic manner. Luteolin pretreatment of cells inhibited IL-1β-mediated phosphorylation of inhibitor of κB, nuclear transcription factor-κB (NF-κB) p65, extracellular signal-regulated kinase-1/2, and c-Jun amino-terminal kinase in a concentration-dependent manner. Luteolin also inhibited AKT phosphorylation and survivin expression, while it triggered both caspase-3 cleavage and expression of glucose-regulated protein 78. These effects were all potentiated by IL-1β, in part through increased nuclear translocation of NF-κB p65. Finally, luteolin was able to reduce IL-1 receptor gene expression, and treatment with IL-1 receptor antagonist or gene silencing of IL-1 receptor prevented IL-1β/luteolin-induced COX-2 expression. Our results document a novel adaptive cellular response to luteolin, which triggers anti-survival and anti-inflammatory mechanisms that contribute to the chemopreventive properties of this diet-derived molecule.
Collapse
Affiliation(s)
- Sylvie Lamy
- Laboratoire d'Oncologie Moléculaire, Centre de Recherche BioMed, Université du Québec à Montréal, C.P. 8888, Succ. Centre-ville, Montréal, Québec H3C 3P8, Canada.
| | - Paula Liana Moldovan
- Laboratoire d'Oncologie Moléculaire, Centre de Recherche BioMed, Université du Québec à Montréal, C.P. 8888, Succ. Centre-ville, Montréal, Québec H3C 3P8, Canada.
| | - Aroua Ben Saad
- Laboratoire d'Oncologie Moléculaire, Centre de Recherche BioMed, Université du Québec à Montréal, C.P. 8888, Succ. Centre-ville, Montréal, Québec H3C 3P8, Canada.
| | - Borhane Annabi
- Laboratoire d'Oncologie Moléculaire, Centre de Recherche BioMed, Université du Québec à Montréal, C.P. 8888, Succ. Centre-ville, Montréal, Québec H3C 3P8, Canada.
| |
Collapse
|
81
|
Adamopoulos C, Farmaki E, Spilioti E, Kiaris H, Piperi C, Papavassiliou AG. Advanced glycation end-products induce endoplasmic reticulum stress in human aortic endothelial cells. Clin Chem Lab Med 2014; 52:151-60. [PMID: 23454718 DOI: 10.1515/cclm-2012-0826] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2012] [Accepted: 02/07/2013] [Indexed: 01/21/2023]
Abstract
BACKGROUND Advanced glycation end products (AGEs), the final products of the Maillard reaction, have been shown to impair endothelial proliferation and function, thus contributing to endothelial cell injury present in diabetes, inflammatory and cardiovascular diseases. Endoplasmic reticulum (ER) stress triggered under hyperglycemic, hypoxic and oxidative conditions has been implicated in endothelial dysfunction through activation of the unfolded protein response (UPR). The present study investigates the role of AGEs in ER stress induction in human aortic endothelial cells exposed to variable AGE treatments. METHODS Human aortic endothelial cells (HAEC) were treated with increasing concentrations (100, 200 μg/mL) of AGE-bovine serum albumin (AGE-BSA) at different time-points (24, 48, 72 h). The induction of ER stress and the involved UPR components were investigated on mRNA and protein levels. Apoptosis was quantitatively determined by flow cytometry detecting propidium iodide expression and annexin V binding simultaneously. RESULTS AGEs administration significantly reduced HAEC proliferation in a time- and dose-dependent manner. An immediate induction of the ER chaperones GRP78, GRP94 and the transcriptional activator, XBP-1 was observed at 24 h and 48 h. A later induction of the phospho-elF2α and proapoptotic transcription factor CHOP was observed at 48 h and 72 h, being correlated with elevated early apoptotic cell numbers at the same time-points. CONCLUSIONS The present study demonstrates that AGEs directly induce ER stress in human aortic endothelial cells, playing an important role in endothelial cell apoptosis. Targeting AGEs signaling pathways in order to alleviate ER stress may prove of therapeutic potential to endothelial dysfunction-related disorders.
Collapse
|
82
|
New roles for old pathways? A circuitous relationship between reactive oxygen species and cyclo-oxygenase in hypertension. Clin Sci (Lond) 2013; 126:111-21. [PMID: 24059588 DOI: 10.1042/cs20120651] [Citation(s) in RCA: 64] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Elevated production of prostanoids from the constitutive (COX-1) or inducible (COX-2) cyclo-oxygenases has been involved in the alterations in vascular function, structure and mechanical properties observed in cardiovascular diseases, including hypertension. In addition, it is well known that production of ROS (reactive oxygen species) plays an important role in the impaired contractile and vasodilator responses, vascular remodelling and altered vascular mechanics of hypertension. Of particular interest is the cross-talk between NADPH oxidase and mitochondria, the main ROS sources in hypertension, which may represent a vicious feed-forward cycle of ROS production. In recent years, there is experimental evidence showing a relationship between ROS and COX-derived products. Thus ROS can activate COX and the COX/PG (prostaglandin) synthase pathways can induce ROS production through effects on different ROS generating enzymes. Additionally, recent evidence suggests that the COX-ROS axis might constitute a vicious circle of self-perpetuating vasoactive products that have a pathophysiological role in altered vascular contractile and dilator responses and hypertension development. The present review discusses the current knowledge on the role of oxidative stress and COX-derived prostanoids in the vascular alterations observed in hypertension, highlighting new findings indicating that these two pathways act in concert to induce vascular dysfunction.
Collapse
|
83
|
Cellular signalling of the receptor for advanced glycation end products (RAGE). Cell Signal 2013; 25:2185-97. [DOI: 10.1016/j.cellsig.2013.06.013] [Citation(s) in RCA: 347] [Impact Index Per Article: 31.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2013] [Revised: 06/15/2013] [Accepted: 06/25/2013] [Indexed: 01/03/2023]
|
84
|
Chen YJ, Sheu ML, Tsai KS, Yang RS, Liu SH. Advanced glycation end products induce peroxisome proliferator-activated receptor γ down-regulation-related inflammatory signals in human chondrocytes via Toll-like receptor-4 and receptor for advanced glycation end products. PLoS One 2013; 8:e66611. [PMID: 23776688 PMCID: PMC3680452 DOI: 10.1371/journal.pone.0066611] [Citation(s) in RCA: 70] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2013] [Accepted: 05/06/2013] [Indexed: 01/02/2023] Open
Abstract
Accumulation of advanced glycation end products (AGEs) in joints is important in the development of cartilage destruction and damage in age-related osteoarthritis (OA). The aim of this study was to investigate the roles of peroxisome proliferator-activated receptor γ (PPARγ), toll-like receptor 4 (TLR4), and receptor for AGEs (RAGE) in AGEs-induced inflammatory signalings in human OA chondrocytes. Human articular chondrocytes were isolated and cultured. The productions of metalloproteinase-13 and interleukin-6 were quantified using the specific ELISA kits. The expressions of related signaling proteins were determined by Western blotting. Our results showed that AGEs enhanced the productions of interleukin-6 and metalloproteinase-13 and the expressions of cyclooxygenase-2 and high-mobility group protein B1 and resulted in the reduction of collagen II expression in human OA chondrocytes. AGEs could also activate nuclear factor (NF)-κB activation. Stimulation of human OA chondrocytes with AGEs significantly induced the up-regulation of TLR4 and RAGE expressions and the down-regulation of PPARγ expression in a time- and concentration-dependent manner. Neutralizing antibodies of TLR4 and RAGE effectively reversed the AGEs-induced inflammatory signalings and PPARγ down-regulation. PPARγ agonist pioglitazone could also reverse the AGEs-increased inflammatory signalings. Specific inhibitors for p38 mitogen-activated protein kinases, c-Jun N-terminal kinase and NF-κB suppressed AGEs-induced PPARγ down-regulation and reduction of collagen II expression. Taken together, these findings suggest that AGEs induce PPARγ down-regulation-mediated inflammatory signalings and reduction of collagen II expression in human OA chondrocytes via TLR4 and RAGE, which may play a crucial role in the development of osteoarthritis pathogenesis induced by AGEs accumulation.
Collapse
Affiliation(s)
- Ying Ju Chen
- Institute of Toxicology, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Meei Ling Sheu
- Institute of Biomedical Sciences, National Chung Hsing University and Department of Education and Research, Taichung Veterans General Hospital, Taichung, Taiwan
| | - Keh Sung Tsai
- Department of Laboratory Medicine, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Rong Sen Yang
- Department of Orthopaedics, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Shing Hwa Liu
- Institute of Toxicology, College of Medicine, National Taiwan University, Taipei, Taiwan
| |
Collapse
|