1
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Xia J, Qiao Z, Hao X, Zhang Y. LDHA-induced histone lactylation mediates the development of osteoarthritis through regulating the transcription activity of TPI1 gene. Autoimmunity 2024; 57:2384889. [PMID: 39086231 DOI: 10.1080/08916934.2024.2384889] [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: 03/21/2024] [Revised: 06/11/2024] [Accepted: 07/21/2024] [Indexed: 08/02/2024]
Abstract
Osteoarthritis (OA) is a worldwide joint disease, leading to the physical pain, stiffness, and even disability. Lactate dehydrogenase A (LDHA) is known as a lactylation mediator that can regulate histone lactylation of its target genes. However, the role of LDHA-mediated histone H3 lysine 18 lactylation (H3K18la) in OA progression is yet to be clarified. Our study aims at revealing the role and mechanism of LDHA-mediated histone lactylation in the glycolysis of chondrocytes. In this study, we determined at first that the H3K18la level was enhanced in OA. Energy metabolism such as glycolysis is often altered in OA progress. Therefore, we further explored the mechanism mediating glycolysis and thus promoting OA progress. Moreover, glycolysis was enhanced in LPS-induced OA cell model, as evidenced by the increased glucose consumption and lactate production. Furthermore, we silenced LDHA for loss-of-function assays. The results showed that knockdown of LDHA suppressed glycolysis of LPS-induced chondrocytes. In vivo animal study demonstrated that knockout of LDHA recovered cartilage injury of OA mice. Mechanistically, we uncovered that LDHA-mediated H3K18la in TPI1 promoter enhanced the transcription activity of TPI1. Mutation of K69 site was found to ameliorate LPS-induced glycolysis in OA cell model. In conclusion, our study reveals the role of LDHA-mediated H3K18la of TPI1 promoter in OA progress.
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Affiliation(s)
- Junfeng Xia
- The First Department of Bone, Nanyang City First People's Hospital, Nanyang City, China
| | - Zongrui Qiao
- The First Department of Bone, Nanyang City First People's Hospital, Nanyang City, China
| | - Xiao Hao
- The First Department of Bone, Nanyang City First People's Hospital, Nanyang City, China
| | - Yin Zhang
- The First Department of Bone, Nanyang City First People's Hospital, Nanyang City, China
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2
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Zhao T, Niu D, Chen Y, Fu P. The role of mitochondrial quality control mechanisms in chondrocyte senescence. Exp Gerontol 2024; 188:112379. [PMID: 38378048 DOI: 10.1016/j.exger.2024.112379] [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: 12/09/2023] [Revised: 02/01/2024] [Accepted: 02/13/2024] [Indexed: 02/22/2024]
Abstract
Chondrocytes are the exclusive cellular constituents of articular cartilage, and their functional status governs the health of the cartilage. The primary factor contributing to the deterioration of cartilage structure and function is chondrocyte senescence. In hypoxia and hypodextrose environment, chondrocytes heavily rely on glycolysis for energy metabolism. Mitochondria, acting as the regulatory hub for chondrocyte energy metabolism, exhibit dysfunction before chondrocyte senescence, indicating their crucial involvement in the process. Previous research has suggested that molecules associated with mitochondrial quality control mechanisms can effectively restore mitochondrial function and alleviate chondrocyte senescence. However, there remains to be clarity regarding the relationship between mitochondrial quality control mechanisms and differences in efficacy among various target molecules, which pose challenges when evaluating them in chondrocytes. By conducting a comprehensive review of the existing literature on mitochondrial quality control mechanisms and chondrocyte senescence, we gain further insights into this intricate relationship while identifying promising targets that could potentially open up novel avenues for the treatment of chondrocyte senescence.
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Affiliation(s)
- Tianlei Zhao
- Naval Medical Center, Naval Medical University, Shanghai 200003, China; Department of Orthopedics, Shanghai Changzheng Hospital, Naval Medical University, Shanghai 200003, China
| | - Dawei Niu
- Department of Orthopedics, Shanghai Changzheng Hospital, Naval Medical University, Shanghai 200003, China; Department of Orthopaedics, The 971 hospital of CPLA Navy, Qingdao 266071, China
| | - Yancheng Chen
- Department of Orthopedics, Shanghai Changzheng Hospital, Naval Medical University, Shanghai 200003, China
| | - Peiliang Fu
- Department of Orthopedics, Shanghai Changzheng Hospital, Naval Medical University, Shanghai 200003, China.
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3
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McCarthy A, Sharma NS, Holubeck PA, Brown D, Shah R, McGoldrick D, John JV, Shahriar SMS, Xie J. Extracellular Matrix Secretion Mechanically Reinforces Interlocking Interfaces. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2023; 35:e2207335. [PMID: 36444871 PMCID: PMC9898214 DOI: 10.1002/adma.202207335] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/11/2022] [Revised: 11/23/2022] [Indexed: 06/12/2023]
Abstract
Drawing inspiration for biomaterials from biological systems has led to many biomedical innovations. One notable bioinspired device, Velcro, consists of two substrates with interlocking ability. Generating reversibly interlocking biomaterials is an area of investigation, as such devices can allow for modular tissue engineering, reversibly interlocking biomaterial interfaces, or friction-based coupling devices. Here, a biaxially interlocking interface generated using electrostatic flocking is reported. Two electrostatically flocked substrates are mechanically and reversibly interlocked with the ability to resist shearing and compression forces. An initial high-throughput screen of polyamide flock fibers with varying diameters and fiber lengths is conducted to elucidate the roles of different fiber parameters on scaffold mechanical properties. After determining the most desirable parameters via weight scoring, polylactic acid (PLA) fibers are used to emulate the ideal scaffold for in vitro use. PLA flocked scaffolds are populated with osteoblasts and interlocked. Interlocked flocked scaffolds improved cell survivorship under mechanical compression and sustained cell viability and proliferation. Additionally, the compression and shearing resistance of cell-seeded interlocking interfaces increased with increasing extracellular matrix deposition. The introduction of extracellular matrix-reinforced interlocking interfaces may serve as binders for modular tissue engineering, act as scaffolds for engineering tissue interfaces, or enable friction-based couplers for biomedical applications.
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Affiliation(s)
- Alec McCarthy
- Department of Surgery – Transplant and Mary & Dick Holland Regenerative Medicine Program, University of Nebraska Medical Center, Omaha, NE, 68198, USA
| | - Navatha Shree Sharma
- Department of Surgery – Transplant and Mary & Dick Holland Regenerative Medicine Program, University of Nebraska Medical Center, Omaha, NE, 68198, USA
| | - Phil A. Holubeck
- Department of Surgery – Transplant and Mary & Dick Holland Regenerative Medicine Program, University of Nebraska Medical Center, Omaha, NE, 68198, USA
| | - Demi Brown
- Department of Surgery – Transplant and Mary & Dick Holland Regenerative Medicine Program, University of Nebraska Medical Center, Omaha, NE, 68198, USA
| | - Rajesh Shah
- Spectro Coating Corporation, Flock Coatings & Short Cut Fibers, Leominster, MA, 01453, USA
| | - Daniel McGoldrick
- Department of Computer Science, School of Computing & Design, California State University ‐ Monterey Bay, Seaside, CA, 93933 USA
| | - Johnson V. John
- Department of Surgery – Transplant and Mary & Dick Holland Regenerative Medicine Program, University of Nebraska Medical Center, Omaha, NE, 68198, USA
| | - S M Shatil Shahriar
- Department of Surgery – Transplant and Mary & Dick Holland Regenerative Medicine Program, University of Nebraska Medical Center, Omaha, NE, 68198, USA
| | - Jingwei Xie
- Department of Surgery – Transplant and Mary & Dick Holland Regenerative Medicine Program, University of Nebraska Medical Center, Omaha, NE, 68198, USA; Department of Mechanical and Materials Engineering, University of Nebraska Lincoln, Lincoln, NE, 68588, USA
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4
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Shen PC, Chou SH, Lu CC, Huang HT, Chien SH, Huang PJ, Liu ZM, Shih CL, Su SJ, Chen LM, Tien YC. Shockwave Treatment Enhanced Extracellular Matrix Production in Articular Chondrocytes Through Activation of the ROS/MAPK/Nrf2 Signaling Pathway. Cartilage 2021; 13:238S-253S. [PMID: 34238028 PMCID: PMC8804851 DOI: 10.1177/19476035211012465] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
OBJECTIVE Shockwave application is a potential treatment for osteoarthritis (OA), but the underlying mechanism remains unknown. Oxidative stress and a counterbalancing antioxidant system might be the key to understanding this mechanism. We hypothesized that reactive oxygen species (ROS) and the transcription factor nuclear factor erythroid 2-related factor 2 (Nrf2),which is an important regulator of cellular redox homeostasis, are plausible elements. DESIGN Porcine chondrocytes were cultured in a 3-dimensional pellet model and subjected to shockwaves. The effects of shockwaves with various energy-flux densities on optimal extracellular matrix (ECM) synthesis were assessed. ROS, mitogen-activated protein kinase (MAPK) signaling, and the redox activity of Nrf2 were measured. To investigate the signaling mechanism involved in the shockwave treatment in chondrocytes, specific inhibitors of ROS, MAPK signaling, and Nrf2 activity were targeted. RESULTS Shockwaves increased ECM synthesis without affecting cell viability or proliferation. Furthermore, they induced transient ROS production mainly through xanthine oxidase. The phosphorylation of ERK1/2 and p38 and the nuclear translocation of Nrf2 were activated by shockwaves. By contrast, suppression of ROS signaling mitigated shockwave-induced MAPK phosphorylation, Nrf2 nuclear translocation, and ECM synthesis. Pretreatment of chondrocytes with the specific inhibitors of MEK1/2 and p38, respectively, mitigated the shockwave-induced nuclear translocation of Nrf2 and ECM synthesis. Nrf2 inhibition by both small hairpin RNA knockdown and brusatol reduced the shockwave-enhanced ECM synthesis. CONCLUSIONS Shockwaves activated Nrf2 activity through the induction of transient ROS signaling and subsequently enhanced ECM synthesis in chondrocytes. This study provided fundamental evidence confirming the potential of shockwaves for OA management.
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Affiliation(s)
- Po-Chih Shen
- Department of Orthopaedic Surgery,
Kaohsiung Medical University Hospital, Kaohsiung,Graduate Institute of Medicine, College
of Medicine, Kaohsiung Medical University, Kaohsiung
| | - Shih-Hsiang Chou
- Department of Orthopaedic Surgery,
Kaohsiung Medical University Hospital, Kaohsiung
| | - Cheng-Chang Lu
- Department of Orthopaedic Surgery,
Kaohsiung Medical University Hospital, Kaohsiung,Graduate Institute of Medicine, College
of Medicine, Kaohsiung Medical University, Kaohsiung,Department of Orthopaedic Surgery,
Kaohsiung Municipal Siaoqang Hospital, Kaohsiung
| | - Hsuan-Ti Huang
- Department of Orthopaedic Surgery,
Kaohsiung Medical University Hospital, Kaohsiung,Department of Orthopaedic Surgery,
Kaohsiung Municipal Ta-Tung Hospital, Kaohsiung
| | - Song-Hsiung Chien
- Department of Orthopaedic Surgery,
Kaohsiung Medical University Hospital, Kaohsiung
| | - Peng-Ju Huang
- Department of Orthopaedic Surgery,
Kaohsiung Medical University Hospital, Kaohsiung
| | - Zi-Miao Liu
- Department of Orthopaedic Surgery,
Kaohsiung Medical University Hospital, Kaohsiung
| | - Chia-Lung Shih
- Department of Orthopaedic Surgery,
Kaohsiung Medical University Hospital, Kaohsiung
| | - Shu-Jem Su
- Department of Medical Laboratory
Science and Biotechnology, School of Medicine and Health Sciences, Fooyin
University, Kaohsiung
| | - Li-Min Chen
- Departments of Pediatrics, E-DA
Hospital, I-Shou University, Kaohsiung City
| | - Yin-Chun Tien
- Department of Orthopaedic Surgery,
Kaohsiung Medical University Hospital, Kaohsiung,Graduate Institute of Medicine, College
of Medicine, Kaohsiung Medical University, Kaohsiung,Yin-Chun Tien, Department of Orthopaedic
Surgery, Kaohsiung Medical University Hospital, 100 Tzu-You 1st Road, Kaohsiung
807.
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5
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Kang D, Lee J, Wu C, Guo X, Lee BJ, Chun JS, Kim JH. The role of selenium metabolism and selenoproteins in cartilage homeostasis and arthropathies. Exp Mol Med 2020; 52:1198-1208. [PMID: 32788658 PMCID: PMC7423502 DOI: 10.1038/s12276-020-0408-y] [Citation(s) in RCA: 78] [Impact Index Per Article: 19.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2019] [Revised: 02/08/2020] [Accepted: 02/10/2020] [Indexed: 01/16/2023] Open
Abstract
As an essential nutrient and trace element, selenium is required for living organisms and its beneficial roles in human health have been well recognized. The role of selenium is mainly played through selenoproteins synthesized by the selenium metabolic system. Selenoproteins have a wide range of cellular functions including regulation of selenium transport, thyroid hormones, immunity, and redox homeostasis. Selenium deficiency contributes to various diseases, such as cardiovascular disease, cancer, liver disease, and arthropathy—Kashin–Beck disease (KBD) and osteoarthritis (OA). A skeletal developmental disorder, KBD has been reported in low-selenium areas of China, North Korea, and the Siberian region of Russia, and can be alleviated by selenium supplementation. OA, the most common form of arthritis, is a degenerative disease caused by an imbalance in matrix metabolism and is characterized by cartilage destruction. Oxidative stress serves as a major cause of the initiation of OA pathogenesis. Selenium deficiency and dysregulation of selenoproteins are associated with impairments to redox homeostasis in cartilage. We review the recently explored roles of selenium metabolism and selenoproteins in cartilage with an emphasis on two arthropathies, KBD and OA. Moreover, we discuss the potential of therapeutic strategies targeting the biological functions of selenium and selenoproteins for OA treatment. Selenium, a micronutrient found in brazil nuts, shiitake mushrooms, and most meats, may aid in treating joint diseases, including the most common form of arthritis, osteoarthritis (OA). In addition to thyroid hormone metabolism and immunity, selenium is important in antioxidant defense. Oxidative damage can destroy cartilage and harm joints, and selenium deficiency is implicated in several joint diseases. Jin-Hong Kim at Seoul National University in South Korea and co-workers reviewed selenium metabolism, focusing on OA and and Kashin–Beck disease, a skeletal development disorder prevalent in selenium-deficient areas of northeast Asia. They report that selenium-containing proteins protect cells against oxidative damage and that selenium is crucial to cartilage production. Further investigation of selenium metabolism may point the way to new treatments for OA and other joint diseases.
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Affiliation(s)
- Donghyun Kang
- Center for RNA Research, Institute for Basic Science, Seoul, 08826, South Korea.,Department of Biological Sciences, College of Natural Sciences, Seoul National University, Seoul, 08826, South Korea
| | - Jeeyeon Lee
- Center for RNA Research, Institute for Basic Science, Seoul, 08826, South Korea.,Department of Biological Sciences, College of Natural Sciences, Seoul National University, Seoul, 08826, South Korea
| | - Cuiyan Wu
- School of Public Health, Xi'an Jiaotong University, Xi'an, 710061, China
| | - Xiong Guo
- School of Public Health, Xi'an Jiaotong University, Xi'an, 710061, China
| | - Byeong Jae Lee
- Department of Biological Sciences, College of Natural Sciences, Seoul National University, Seoul, 08826, South Korea.,Interdisciplinary Program in Bioinformatics, Seoul National University, Seoul, 08826, South Korea
| | - Jang-Soo Chun
- National Creative Research Initiatives Center for Osteoarthritis Pathogenesis and School of Life Sciences, Gwangju Institute of Science and Technology, Gwangju, 61005, South Korea
| | - Jin-Hong Kim
- Center for RNA Research, Institute for Basic Science, Seoul, 08826, South Korea. .,Department of Biological Sciences, College of Natural Sciences, Seoul National University, Seoul, 08826, South Korea. .,Interdisciplinary Program in Bioinformatics, Seoul National University, Seoul, 08826, South Korea.
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6
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Nagaraj A, Samiappan S. Presentation of Antibacterial and Therapeutic Anti-inflammatory Potentials to Hydroxyapatite via Biomimetic With Azadirachta indica: An in vitro Anti-inflammatory Assessment in Contradiction of LPS-Induced Stress in RAW 264.7 Cells. Front Microbiol 2019; 10:1757. [PMID: 31447805 PMCID: PMC6692563 DOI: 10.3389/fmicb.2019.01757] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2019] [Accepted: 07/16/2019] [Indexed: 12/20/2022] Open
Abstract
In the present study, for the first time, biomimetization of hydroxyapatite (HA) with Azadirachta indica (AI) was proposed and established its antioxidant, antibacterial, and anti-inflammatory potential on lipopolysaccharide (LPS). The ethanolic extract of AI was found rich with phenolics and flavonoids, and determined their concentration as 8.98 ± 1.41 mg gallic acid equivalents/g and 5.46 ± 0.84 mg catechin equivalents/g, respectively. The HA was prepared by sol-gel method from calcium nitrate tetrahydrate and orthophosphoric acid, and successfully biomimetization was performed with ethanolic extract of AI. The FTIR analysis settled that as-synthesized HA-AI composite was comprised of both HA and AI. The XRD pattern and Zeta potential revealed that the HA-AI composite was crystalline and negative in charge (-24.0 mV). The average-size distribution, shape, and size of the HA-AI composite was determined as 238.90 d.nm, spherical, and 117.90 nm from size distribution, SEM, and HR-TEM analysis, respectively. The SEM-EDX concluded that the HA-AI composite was comprised of elements of HA as well as AI. The HA-AI composite presented potential antioxidant activity and its EC50 values (dose required to inhibit about half of the radicals) for ABTS and DPPH assays were determined as 115.72 ± 2.33 and 128.51 ± 1.04 μg/ml, respectively. The HA-AI composite showed potent antibacterial activity, and minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) towards S. aureus (ATCC 700699) and E. coli (ATCC 10536) were correspondingly determined as 266.7 ± 28.87 and 600.0 ± 50.0 μg/ml, and 400.0 ± 86.6 and 816.7 ± 76.38 μg/ml. Most importantly, HA-AI composite presented the potential anti-inflammatory response toward lipopolysaccharide (LPS) in RAW 264.7 cells. The dose of 250 μg/ml of HA-AI composite has shown optimum protection against LPS-induced stress (1 μg/ml) by scavenging oxidants and regulating mitochondrial membrane potential (MMP), inflammatory and apoptotic factors. Thus, this study concluded that the impartation of potential biofunctional features to HA from plant sources through biomimetic approach is much beneficial and could find potential application in dentistry and orthopedic.
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Affiliation(s)
- Anusuya Nagaraj
- Department of Biochemistry, Bharathiar University, Coimbatore, India
| | - Suja Samiappan
- Department of Biochemistry, Bharathiar University, Coimbatore, India
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7
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Rieder B, Weihs AM, Weidinger A, Szwarc D, Nürnberger S, Redl H, Rünzler D, Huber-Gries C, Teuschl AH. Hydrostatic pressure-generated reactive oxygen species induce osteoarthritic conditions in cartilage pellet cultures. Sci Rep 2018; 8:17010. [PMID: 30451865 PMCID: PMC6242959 DOI: 10.1038/s41598-018-34718-8] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2018] [Accepted: 10/22/2018] [Indexed: 11/24/2022] Open
Abstract
Osteoarthritis (OA) is one of the most common causes of disability and represents a major socio-economic burden. Despite intensive research, the molecular mechanisms responsible for the initiation and progression of OA remain inconclusive. In recent years experimental findings revealed elevated levels of reactive oxygen species (ROS) as a major factor contributing to the onset and progression of OA. Hence, we designed a hydrostatic pressure bioreactor system that is capable of stimulating cartilage cell cultures with elevated ROS levels. Increased ROS levels in the media did not only lead to an inhibition of glycosaminoglycans and collagen II formation but also to a reduction of already formed glycosaminoglycans and collagen II in chondrogenic mesenchymal stem cell pellet cultures. These effects were associated with the elevated activity of matrix metalloproteinases as well as the increased expression of several inflammatory cytokines. ROS activated different signaling pathways including PI3K/Akt and MAPK/ERK which are known to be involved in OA initiation and progression. Utilizing the presented bioreactor system, an OA in vitro model based on the generation of ROS was developed that enables the further investigation of ROS effects on cartilage degradation but can also be used as a versatile tool for anti-oxidative drug testing.
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Affiliation(s)
- Bernhard Rieder
- Department Life Science Engineering, University of Applied Sciences Technikum Wien, 1200, Vienna, Austria.,Austrian Cluster for Tissue Regeneration, 1200, Vienna, Austria
| | - Anna M Weihs
- Department Life Science Engineering, University of Applied Sciences Technikum Wien, 1200, Vienna, Austria.,Austrian Cluster for Tissue Regeneration, 1200, Vienna, Austria
| | - Adelheid Weidinger
- Ludwig Boltzmann Institute for Experimental and Clinical Traumatology, AUVA Research Center, 1200, Vienna, Austria.,Austrian Cluster for Tissue Regeneration, 1200, Vienna, Austria
| | - Dorota Szwarc
- Department Life Science Engineering, University of Applied Sciences Technikum Wien, 1200, Vienna, Austria.,Austrian Cluster for Tissue Regeneration, 1200, Vienna, Austria
| | - Sylvia Nürnberger
- Ludwig Boltzmann Institute for Experimental and Clinical Traumatology, AUVA Research Center, 1200, Vienna, Austria.,Department of Orthopedics and Trauma-Surgery, Division of Trauma-Surgery, Medical University of Vienna, 1090, Vienna, Austria.,University Clinic of Dentistry, Medical University of Vienna, 1090, Vienna, Austria.,Austrian Cluster for Tissue Regeneration, 1200, Vienna, Austria
| | - Heinz Redl
- Ludwig Boltzmann Institute for Experimental and Clinical Traumatology, AUVA Research Center, 1200, Vienna, Austria.,Austrian Cluster for Tissue Regeneration, 1200, Vienna, Austria
| | - Dominik Rünzler
- Department Life Science Engineering, University of Applied Sciences Technikum Wien, 1200, Vienna, Austria.,Austrian Cluster for Tissue Regeneration, 1200, Vienna, Austria
| | - Carina Huber-Gries
- Department Life Science Engineering, University of Applied Sciences Technikum Wien, 1200, Vienna, Austria.,Austrian Cluster for Tissue Regeneration, 1200, Vienna, Austria
| | - Andreas H Teuschl
- Department Life Science Engineering, University of Applied Sciences Technikum Wien, 1200, Vienna, Austria. .,Austrian Cluster for Tissue Regeneration, 1200, Vienna, Austria.
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8
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Navarro SM, Haeberle HS, Sokunbi OF, Frankel WC, Wera GD, Mont MA, Ramkumar PN. The Evidence Behind Peroxide in Orthopedic Surgery. Orthopedics 2018; 41:e756-e764. [PMID: 30321442 DOI: 10.3928/01477447-20181010-07] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/21/2017] [Accepted: 11/30/2017] [Indexed: 02/03/2023]
Abstract
Peroxide is a strong oxidizing agent and disinfectant frequently used in orthopedic surgery. The authors conducted a systematic literature review of peroxide in orthopedic surgery, evaluating use, complications, efficacy, and appropriate concentrations. One hundred seventy-five reports were identified, with 24 being eligible for analysis. Orthopedic surgeons used peroxide for irrigation and bacterial reduction in various procedures. Complications included cytotoxicity, allergic reactions, suture damage, and inflammation. Use of the standard concentration of 3% peroxide and standard time in situ are without evidence. Laboratory studies suggest that diluted concentrations retain the benefit of bacterial decolonization without increasing the risk for complications. [Orthopedics. 2018; 41(6):e756-e764.].
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9
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McGarry T, Biniecka M, Veale DJ, Fearon U. Hypoxia, oxidative stress and inflammation. Free Radic Biol Med 2018; 125:15-24. [PMID: 29601945 DOI: 10.1016/j.freeradbiomed.2018.03.042] [Citation(s) in RCA: 329] [Impact Index Per Article: 54.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/19/2017] [Revised: 03/20/2018] [Accepted: 03/24/2018] [Indexed: 12/20/2022]
Abstract
Inflammatory Arthritis is characterized by synovial proliferation, neovascularization and leukocyte extravasation leading to joint destruction and functional disability. Efficiency of oxygen supply to the synovium is poor due to the highly dysregulated synovial microvasculature. This along with the increased energy demands of activated infiltrating immune cells and inflamed resident cells leads to an hypoxic microenvironment and mitochondrial dysfunction. This favors an increase of reactive oxygen species, leading to oxidative damage which further promotes inflammation. In this adverse microenvironment synovial cells adapt to generate energy and switch their cell metabolism from a resting regulatory state to a highly metabolically active state which allows them to produce essential building blocks to support their proliferation. This metabolic shift results in the accumulation of metabolic intermediates which act as signaling molecules that further dictate the inflammatory response. Understanding the complex interplay between hypoxia-induced signaling pathways, oxidative stress and mitochondrial function will provide better insight into the underlying mechanisms of disease pathogenesis.
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Affiliation(s)
- Trudy McGarry
- The Department of Molecular Rheumatology, Trinity College Dublin, Ireland
| | - Monika Biniecka
- The Centre for Arthritis and Rheumatic Disease, Dublin Academic Medical Centre, St. Vincent's University Hospital, Elm Park, Dublin 4, Ireland
| | - Douglas J Veale
- The Centre for Arthritis and Rheumatic Disease, Dublin Academic Medical Centre, St. Vincent's University Hospital, Elm Park, Dublin 4, Ireland
| | - Ursula Fearon
- The Department of Molecular Rheumatology, Trinity College Dublin, Ireland.
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10
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Issa R, Boeving M, Kinter M, Griffin TM. Effect of biomechanical stress on endogenous antioxidant networks in bovine articular cartilage. J Orthop Res 2018; 36:760-769. [PMID: 28892196 PMCID: PMC5839935 DOI: 10.1002/jor.23728] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/02/2017] [Accepted: 08/31/2017] [Indexed: 02/04/2023]
Abstract
Mechanosensitve pathways in chondrocytes are essential for maintaining articular cartilage homeostasis. Traumatic loading increases cartilage oxidation and causes cell death and osteoarthritis. However, sub-lethal doses of the pro-oxidant molecule tert-Butyl hydroperoxide (tBHP) protects against loading-induced chondrocyte death. We hypothesized that compressive cyclic loading at moderate strains (<20%) causes sub-lethal cartilage oxidation that induces an adaptive increase in the endogenous antioxidant defense network. We tested this hypothesis by subjecting healthy bovine articular cartilage explants to in vitro static or cyclic (1 Hz) compressive loading at 50 kPa (15% strain, "physiologic") versus 300 kPa (40% strain, "hyper-physiologic") for 12 h per day for 2 days. We also treated unloaded explants with 100 μM tBHP for 12 h per day for 2 days to differentiate between biomechanical and chemical pro-oxidant stimulation. All loading conditions induced glutathione oxidation relative to unloaded controls, but only the 50 kPa cyclic loading condition increased total glutathione content (twofold). This increase was associated with a greater expression of glutamate-cysteine ligase, the rate-limiting step in glutathione synthesis, compared to 300 kPa cyclic loading. 50 kPa cyclic loading also increased the expression of superoxide dismutase-1 and peroxiredoxin-3. Like 50 kPa loading, tBHP treatment also increased total glutathione content. However, tBHP treatment and 50 kPa cyclic loading differed in their effect on the expression of genes regulating antioxidant defense and cartilage matrix synthesis and degradation. These findings suggest that glutathione metabolism is a mechanosensitive antioxidant defense pathway in chondrocytes and that intermittent pro-oxidant treatment alone is insufficient to account for all changes in mediators of cartilage homeostasis associated with cyclic loading. © 2017 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 36:760-769, 2018.
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Affiliation(s)
- Rita Issa
- Aging and Metabolism Research Program, Oklahoma Medical Research Foundation, Oklahoma City, OK, USA
| | - Michael Boeving
- Aging and Metabolism Research Program, Oklahoma Medical Research Foundation, Oklahoma City, OK, USA
| | - Michael Kinter
- Aging and Metabolism Research Program, Oklahoma Medical Research Foundation, Oklahoma City, OK, USA,Department of Geriatric Medicine, Reynolds Oklahoma Center on Aging, University of Oklahoma Health Sciences Center, Oklahoma City, OK, USA
| | - Timothy M. Griffin
- Aging and Metabolism Research Program, Oklahoma Medical Research Foundation, Oklahoma City, OK, USA,Department of Geriatric Medicine, Reynolds Oklahoma Center on Aging, University of Oklahoma Health Sciences Center, Oklahoma City, OK, USA,Department of Biochemistry and Molecular Biology and Department of Physiology, University of Oklahoma Health Sciences Center, Oklahoma City, OK, USA
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11
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Mobasheri A, Rayman MP, Gualillo O, Sellam J, van der Kraan P, Fearon U. The role of metabolism in the pathogenesis of osteoarthritis. Nat Rev Rheumatol 2017; 13:302-311. [PMID: 28381830 DOI: 10.1038/nrrheum.2017.50] [Citation(s) in RCA: 410] [Impact Index Per Article: 58.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Metabolism is important for cartilage and synovial joint function. Under adverse microenvironmental conditions, mammalian cells undergo a switch in cell metabolism from a resting regulatory state to a highly metabolically activate state to maintain energy homeostasis. This phenomenon also leads to an increase in metabolic intermediates for the biosynthesis of inflammatory and degradative proteins, which in turn activate key transcription factors and inflammatory signalling pathways involved in catabolic processes, and the persistent perpetuation of drivers of pathogenesis. In the past few years, several studies have demonstrated that metabolism has a key role in inflammatory joint diseases. In particular, metabolism is drastically altered in osteoarthritis (OA) and aberrant immunometabolism may be a key feature of many phenotypes of OA. This Review focuses on aberrant metabolism in the pathogenesis of OA, summarizing the current state of knowledge on the role of impaired metabolism in the cells of the osteoarthritic joint. We also highlight areas for future research, such as the potential to target metabolic pathways and mediators therapeutically.
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Affiliation(s)
- Ali Mobasheri
- Department of Veterinary Preclinical Sciences, School of Veterinary Medicine, Faculty of Health and Medical Sciences University of Surrey, Guildford GU2 7AL, UK.,Arthritis Research UK Centre for Sport, Exercise and Osteoarthritis and MRC Arthritis Research UK Centre for Musculoskeletal Ageing Research, Queen's Medical Centre, Nottingham NG7 2UH, UK
| | - Margaret P Rayman
- Department of Nutritional Sciences, School of Biosciences and Medicine, Faculty of Health and Medical Sciences, University of Surrey, Guildford GU2 7XH, UK
| | - Oreste Gualillo
- SERGAS (Servizo Galego de Saude) and IDIS (Instituto de Investigación Sanitaria de Santiago), The NEIRID Group (Neuroendocrine Interactions in Rheumatology and Inflammatory Diseases), Santiago University Clinical Hospital, Building C, Travesia da Choupana S/N, Santiago de Compostela 15706, Spain
| | - Jérémie Sellam
- Department of Rheumatology, Inflammation-Immunopathology-Biotherapy Department (DHU i2B), Saint-Antoine Hospital, Assistance Publique-Hôpitaux de Paris (APHP), 184 Rue de Faubourg Saint-Antoine, 75012 Paris, France.,Inflammation-Immunopathology-Biotherapy Department (DHU i2B), INSERM, UMR S938, Sorbonne University, University of Paris 6, 75005 Paris, France
| | - Peter van der Kraan
- Department of Rheumatology, Experimental Rheumatology, Radboud University Medical Center, Geert Grooteplein 26-28, 6500 HB Nijmegen, Netherlands
| | - Ursula Fearon
- Department of Molecular Rheumatology, Trinity College Dublin, University of Dublin, College Green, Dublin 2, Ireland
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12
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Martin JA, Anderson DD, Goetz JE, Fredericks D, Pedersen DR, Ayati BP, Marsh JL, Buckwalter JA. Complementary models reveal cellular responses to contact stresses that contribute to post-traumatic osteoarthritis. J Orthop Res 2017; 35:515-523. [PMID: 27509320 PMCID: PMC5303196 DOI: 10.1002/jor.23389] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/20/2016] [Accepted: 08/05/2016] [Indexed: 02/04/2023]
Abstract
Two categories of joint overloading cause post-traumatic osteoarthritis (PTOA): single acute traumatic loads/impactions and repetitive overloading due to incongruity/instability. We developed and refined three classes of complementary models to define relationships between joint overloading and progressive cartilage loss across the spectrum of acute injuries and chronic joint abnormalities: explant and whole joint models that allow probing of cellular responses to mechanical injury and contact stresses, animal models that enable study of PTOA pathways in living joints and pre-clinical testing of treatments, and patient-specific computational models that define the overloading that causes OA in humans. We coordinated methodologies across models so that results from each informed the others, maximizing the benefit of this complementary approach. We are incorporating results from these investigations into biomathematical models to provide predictions of PTOA risk and guide treatment. Each approach has limitations, but each provides opportunities to elucidate PTOA pathogenesis. Taken together, they help define levels of joint overloading that cause cartilage destruction, show that both forms of overloading can act through the same biologic pathways, and create a framework for initiating clinical interventions that decrease PTOA risk. Considered collectively, studies extending from explants to humans show that thresholds of joint overloading that cause cartilage loss can be defined, that to at least some extent both forms of joint overloading act through the same biologic pathways, and interventions that interrupt these pathways prevent cartilage damage. These observations suggest that treatments that decrease the risk of all forms of OA progression can be discovered. © 2016 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 35:515-523, 2017.
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Affiliation(s)
- James A. Martin
- Departments of Orthopedics and Rehabilitation, University of Iowa, Iowa City Iowa,Departments of Biomedical Engineering, University of Iowa, Iowa City Iowa
| | - Donald D. Anderson
- Departments of Orthopedics and Rehabilitation, University of Iowa, Iowa City Iowa,Departments of Biomedical Engineering, University of Iowa, Iowa City Iowa
| | - Jessica E. Goetz
- Departments of Orthopedics and Rehabilitation, University of Iowa, Iowa City Iowa,Departments of Biomedical Engineering, University of Iowa, Iowa City Iowa
| | - Douglas Fredericks
- Departments of Orthopedics and Rehabilitation, University of Iowa, Iowa City Iowa
| | - Douglas R. Pedersen
- Departments of Orthopedics and Rehabilitation, University of Iowa, Iowa City Iowa,Departments of Biomedical Engineering, University of Iowa, Iowa City Iowa
| | - Bruce P. Ayati
- Departments of Orthopedics and Rehabilitation, University of Iowa, Iowa City Iowa,Departments of Mathematics, University of Iowa, Iowa City Iowa
| | - J. Lawrence Marsh
- Departments of Orthopedics and Rehabilitation, University of Iowa, Iowa City Iowa
| | - Joseph A. Buckwalter
- Departments of Orthopedics and Rehabilitation, University of Iowa, Iowa City Iowa,Iowa City Veterans Administration Medical Center
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13
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Bonitsky CM, McGann ME, Selep MJ, Ovaert TC, Trippel SB, Wagner DR. Genipin crosslinking decreases the mechanical wear and biochemical degradation of impacted cartilage in vitro. J Orthop Res 2017; 35:558-565. [PMID: 27584857 PMCID: PMC5518482 DOI: 10.1002/jor.23411] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/01/2016] [Accepted: 08/29/2016] [Indexed: 02/04/2023]
Abstract
High energy trauma to cartilage causes surface fissures and microstructural damage, but the degree to which this damage renders the tissue more susceptible to wear and contributes to the progression of post-traumatic osteoarthritis (PTOA) is unknown. Additionally, no treatments are currently available to strengthen cartilage after joint trauma and to protect the tissue from subsequent degradation and wear. The purposes of this study were to investigate the role of mechanical damage in the degradation and wear of cartilage, to evaluate the effects of impact and subsequent genipin crosslinking on the changes in the viscoelastic parameters of articular cartilage, and to test the hypothesis that genipin crosslinking is an effective treatment to enhance the resistance to biochemical degradation and mechanical wear. Results demonstrate that cartilage stiffness decreases after impact loading, likely due to the formation of fissures and microarchitectural damage, and is partially or fully restored by crosslinking. The wear resistance of impacted articular cartilage was diminished compared to undamaged cartilage, suggesting that mechanical damage that is directly induced by the impact may contribute to the progression of PTOA. However, the decrease in wear resistance was completely reversed by the crosslinking treatments. Additionally, the crosslinking treatments improved the resistance to collagenase digestion at the impact-damaged articular surface. These results highlight the potential therapeutic value of collagen crosslinking via genipin in the prevention of cartilage degeneration after traumatic injury. © 2016 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 35:558-565, 2017.
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Affiliation(s)
- Craig M. Bonitsky
- Department of Aerospace and Mechanical Engineering, University of Notre Dame, Notre Dame, Indiana
| | - Megan E. McGann
- Department of Aerospace and Mechanical Engineering, University of Notre Dame, Notre Dame, Indiana
| | - Michael J. Selep
- Department of Aerospace and Mechanical Engineering, University of Notre Dame, Notre Dame, Indiana
| | - Timothy C. Ovaert
- Department of Aerospace and Mechanical Engineering, University of Notre Dame, Notre Dame, Indiana
| | - Stephen B. Trippel
- Deparment of Orthopaedic Surgery, Indiana University School of Medicine, Indianapolis, Indiana
| | - Diane R. Wagner
- Department of Mechanical Engineering, Indiana University-Purdue University Indianapolis, 723 W. Michigan St. SL 260, Indianapolis, Indiana 46202
- Department of Biomedical Engineering, Indiana University-Purdue University Indianapolis, Indianapolis, Indiana
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14
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Ayati BP, Kapitanov GI, Coleman MC, Anderson DD, Martin JA. Mathematics as a conduit for translational research in post-traumatic osteoarthritis. J Orthop Res 2017; 35:566-572. [PMID: 27653021 PMCID: PMC5352510 DOI: 10.1002/jor.23439] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/09/2016] [Accepted: 09/15/2016] [Indexed: 02/04/2023]
Abstract
Biomathematical models offer a powerful method of clarifying complex temporal interactions and the relationships among multiple variables in a system. We present a coupled in silico biomathematical model of articular cartilage degeneration in response to impact and/or aberrant loading such as would be associated with injury to an articular joint. The model incorporates fundamental biological and mechanical information obtained from explant and small animal studies to predict post-traumatic osteoarthritis (PTOA) progression, with an eye toward eventual application in human patients. In this sense, we refer to the mathematics as a "conduit of translation." The new in silico framework presented in this paper involves a biomathematical model for the cellular and biochemical response to strains computed using finite element analysis. The model predicts qualitative responses presently, utilizing system parameter values largely taken from the literature. To contribute to accurate predictions, models need to be accurately parameterized with values that are based on solid science. We discuss a parameter identification protocol that will enable us to make increasingly accurate predictions of PTOA progression using additional data from smaller scale explant and small animal assays as they become available. By distilling the data from the explant and animal assays into parameters for biomathematical models, mathematics can translate experimental data to clinically relevant knowledge. © 2016 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 35:566-572, 2017.
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Affiliation(s)
- Bruce P. Ayati
- Departments of Mathematics, Orthopedics & Rehabilitation, and Program in Applied Mathematical and Computational Sciences, University of Iowa
| | | | | | - Donald D. Anderson
- Departments of Orthopedics & Rehabilitation and Biomedical Engineering, University of Iowa
| | - James A. Martin
- Departments of Orthopedics & Rehabilitation and Biomedical Engineering, University of Iowa
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15
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Shekhawat VK, Schmid TM, Pennekamp PH, Pacione CA, Chubinskaya S, Wimmer MA. Implications of trauma and subsequent articulation on the release of Proteoglycan-4 and tissue response in adult human ankle cartilage. J Orthop Res 2017; 35:667-676. [PMID: 27551813 DOI: 10.1002/jor.23397] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/14/2016] [Accepted: 08/12/2016] [Indexed: 02/04/2023]
Abstract
The purpose of this study was to investigate the effects of trauma and subsequent articulation on adult human ankle cartilage subjected to an injurious impact. Trauma was initiated through impaction on talar cartilage explants. Articulation and loading were applied in a joint bioreactor over 5 consecutive days. The early (24 h) effects of impaction included a reduced chondrocytes viability (51% vs. 81% for non-impacted; p = 0.03), increased levels of apoptosis (43% vs. 27%; p = 0.03), and an increase in the histopathology score (4.4 vs. 1.7; p = 0.02) as compared to non-impacted cartilage explants. One of the key findings was that damage also stimulated the PRG4 release (2.2 vs. 1.5 μg/ml). Subsequent articulation for 5 days did not lead to further changes in tissue histopathology and cell viability, neither for injured nor non-injured samples. However, articulation led to an increased apoptosis in the injured samples (p = 0.03 for the interaction term). Articulation also caused a significant increase of PG/GAG release into the culture medium (p = 0.04) for both injured and non-injured samples; however, the synthesis of PG was not affected by articulation (p = 0.45) though the PG synthesis was higher in injured samples (p < 0.01). With regard to the PRG4 release, impacted samples continued to show higher amounts (p = 0.01), adding articulation led to a reduction (p = 0.02). The current study demonstrated that adult human talar cartilage increases both the PRG4 release and biosynthetic activity as an immediate cellular response to injury. Articulation played a less contributing role to biosynthesis and remodeling, behaving mostly neutral, in that no further damage emerged. © 2016 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 35:667-676, 2017.
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Affiliation(s)
- Vivek K Shekhawat
- Department of Orthopedic Surgery, Rush University Medical Center, Chicago, Illinois
| | - Thomas M Schmid
- Department of Biochemistry, Rush University Medical Center, Chicago, Illinois
| | - Peter H Pennekamp
- Department of Orthopedic Surgery, Rush University Medical Center, Chicago, Illinois
| | - Carol A Pacione
- Department of Orthopedic Surgery, Rush University Medical Center, Chicago, Illinois
| | - Susan Chubinskaya
- Department of Orthopedic Surgery, Rush University Medical Center, Chicago, Illinois.,Department of Pediatrics, Rush University Medical Center, Chicago, Illinois
| | - Markus A Wimmer
- Department of Orthopedic Surgery, Rush University Medical Center, Chicago, Illinois.,Department of Biochemistry, Rush University Medical Center, Chicago, Illinois
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16
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Insights on Molecular Mechanisms of Chondrocytes Death in Osteoarthritis. Int J Mol Sci 2016; 17:ijms17122146. [PMID: 27999417 PMCID: PMC5187946 DOI: 10.3390/ijms17122146] [Citation(s) in RCA: 232] [Impact Index Per Article: 29.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2016] [Revised: 12/05/2016] [Accepted: 12/12/2016] [Indexed: 12/21/2022] Open
Abstract
Osteoarthritis (OA) is a joint pathology characterized by progressive cartilage degradation. Medical care is mainly based on alleviating pain symptoms. Compelling studies report the presence of empty lacunae and hypocellularity in cartilage with aging and OA progression, suggesting that chondrocyte cell death occurs and participates to OA development. However, the relative contribution of apoptosis per se in OA pathogenesis appears complex to evaluate. Indeed, depending on technical approaches, OA stages, cartilage layers, animal models, as well as in vivo or in vitro experiments, the percentage of apoptosis and cell death types can vary. Apoptosis, chondroptosis, necrosis, and autophagic cell death are described in this review. The question of cell death causality in OA progression is also addressed, as well as the molecular pathways leading to cell death in response to the following inducers: Fas, Interleukin-1β (IL-1β), Tumor Necrosis factor-α (TNF-α), leptin, nitric oxide (NO) donors, and mechanical stresses. Furthermore, the protective role of autophagy in chondrocytes is highlighted, as well as its decline during OA progression, enhancing chondrocyte cell death; the transition being mainly controlled by HIF-1α/HIF-2α imbalance. Finally, we have considered whether interfering in chondrocyte apoptosis or promoting autophagy could constitute therapeutic strategies to impede OA progression.
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17
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Hypoxia, mitochondrial dysfunction and synovial invasiveness in rheumatoid arthritis. Nat Rev Rheumatol 2016; 12:385-97. [DOI: 10.1038/nrrheum.2016.69] [Citation(s) in RCA: 173] [Impact Index Per Article: 21.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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18
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Biniecka M, Canavan M, McGarry T, Gao W, McCormick J, Cregan S, Gallagher L, Smith T, Phelan JJ, Ryan J, O'Sullivan J, Ng CT, Veale DJ, Fearon U. Dysregulated bioenergetics: a key regulator of joint inflammation. Ann Rheum Dis 2016; 75:2192-2200. [PMID: 27013493 PMCID: PMC5136702 DOI: 10.1136/annrheumdis-2015-208476] [Citation(s) in RCA: 165] [Impact Index Per Article: 20.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2015] [Revised: 01/28/2016] [Accepted: 03/03/2016] [Indexed: 11/09/2022]
Abstract
Objectives This study examines the relationship between synovial hypoxia and cellular bioenergetics with synovial inflammation. Methods Primary rheumatoid arthritis synovial fibroblasts (RASF) were cultured with hypoxia, dimethyloxalylglycine (DMOG) or metabolic intermediates. Mitochondrial respiration, mitochondrial DNA mutations, cell invasion, cytokines, glucose and lactate were quantified using specific functional assays. RASF metabolism was assessed by the XF24-Flux Analyzer. Mitochondrial structural morphology was assessed by transmission electron microscopy (TEM). In vivo synovial tissue oxygen (tpO2 mmHg) was measured in patients with inflammatory arthritis (n=42) at arthroscopy, and markers of glycolysis/oxidative phosphorylation (glyceraldehyde 3-phosphate dehydrogenase (GAPDH), PKM2, GLUT1, ATP) were quantified by immunohistology. A subgroup of patients underwent contiguous MRI and positron emission tomography (PET)/CT imaging. RASF and human dermal microvascular endothelial cells (HMVEC) migration/angiogenesis, transcriptional activation (HIF1α, pSTAT3, Notch1-IC) and cytokines were examined in the presence of glycolytic inhibitor 3-(3-Pyridinyl)-1-(4-pyridinyl)-2-propen-1-one (3PO). Results DMOG significantly increased mtDNA mutations, mitochondrial membrane potential, mitochondrial mass, reactive oxygen species and glycolytic RASF activity with concomitant attenuation of mitochondrial respiration and ATP activity (all p<0.01). This was coupled with altered mitochondrial morphology. Hypoxia-induced lactate levels (p<0.01), which in turn induced basic fibroblast growth factor (bFGF) secretion and RASF invasiveness (all p<0.05). In vivo glycolytic markers were inversely associated with synovial tpO2 levels <20 mm Hg, in contrast ATP was significantly reduced (all p<0.05). Decrease in GAPDH and GLUT1 was paralleled by an increase in in vivo tpO2 in tumour necrosis factor alpha inhibitor (TNFi) responders. Novel PET/MRI hybrid imaging demonstrated close association between metabolic activity and inflammation. 3PO significantly inhibited RASF invasion/migration, angiogenic tube formation, secretion of proinflammatory mediators (all p<0.05), and activation of HIF1α, pSTAT3 and Notch-1IC under normoxic and hypoxic conditions. Conclusions Hypoxia alters cellular bioenergetics by inducing mitochondrial dysfunction and promoting a switch to glycolysis, supporting abnormal angiogenesis, cellular invasion and pannus formation.
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Affiliation(s)
- M Biniecka
- Centre for Arthritis and Rheumatic Diseases, Dublin Academic Medical Centre, St. Vincent's University Hospital, Dublin, Ireland
| | - M Canavan
- Department of Molecular Rheumatology, Trinity Biomedical Sciences Institute, Trinity College Dublin, Dublin, Ireland
| | - T McGarry
- Department of Molecular Rheumatology, Trinity Biomedical Sciences Institute, Trinity College Dublin, Dublin, Ireland
| | - W Gao
- Centre for Arthritis and Rheumatic Diseases, Dublin Academic Medical Centre, St. Vincent's University Hospital, Dublin, Ireland
| | - J McCormick
- Centre for Arthritis and Rheumatic Diseases, Dublin Academic Medical Centre, St. Vincent's University Hospital, Dublin, Ireland
| | - S Cregan
- Centre for Arthritis and Rheumatic Diseases, Dublin Academic Medical Centre, St. Vincent's University Hospital, Dublin, Ireland
| | - L Gallagher
- Centre for Arthritis and Rheumatic Diseases, Dublin Academic Medical Centre, St. Vincent's University Hospital, Dublin, Ireland
| | - T Smith
- Centre for Arthritis and Rheumatic Diseases, Dublin Academic Medical Centre, St. Vincent's University Hospital, Dublin, Ireland
| | - J J Phelan
- Department of Surgery, Trinity College Dublin, St James's Hospital, Dublin, Ireland
| | - J Ryan
- Department of Radiology, School of Medicine and Biomedical Sciences, University College Dublin, Dublin, Ireland
| | - J O'Sullivan
- Department of Surgery, Trinity College Dublin, St James's Hospital, Dublin, Ireland
| | - C T Ng
- Department of Rheumatology and Immunology, Singapore General Hospital, Singapore, Singapore
| | - D J Veale
- Centre for Arthritis and Rheumatic Diseases, Dublin Academic Medical Centre, St. Vincent's University Hospital, Dublin, Ireland
| | - U Fearon
- Department of Molecular Rheumatology, Trinity Biomedical Sciences Institute, Trinity College Dublin, Dublin, Ireland
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Novakofski KD, Pownder SL, Koff MF, Williams RM, Potter HG, Fortier LA. High-Resolution Methods for Diagnosing Cartilage Damage In Vivo. Cartilage 2016; 7:39-51. [PMID: 26958316 PMCID: PMC4749750 DOI: 10.1177/1947603515602307] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Advances in current clinical modalities, including magnetic resonance imaging and computed tomography, allow for earlier diagnoses of cartilage damage that could mitigate progression to osteoarthritis. However, current imaging modalities do not detect submicrometer damage. Developments in in vivo or arthroscopic techniques, including optical coherence tomography, ultrasonography, bioelectricity including streaming potential measurement, noninvasive electroarthrography, and multiphoton microscopy can detect damage at an earlier time point, but they are limited by a lack of penetration and the ability to assess an entire joint. This article reviews current advancements in clinical and developing modalities that can aid in the early diagnosis of cartilage injury and facilitate studies of interventional therapeutics.
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Affiliation(s)
| | | | - Matthew F. Koff
- MRI Laboratory, Hospital for Special Surgery, New York, NY, USA
| | | | | | - Lisa A. Fortier
- Department of Clinical Sciences, Cornell University, Ithaca, NY, USA,Lisa A. Fortier, Department of Clinical Sciences, Cornell University, VMC C3-181, Ithaca, NY 14853, USA. Email
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20
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Gong X, Duan R, Ao JE, Ai Q, Ge P, Lin L, Zhang L. Metformin suppresses intrahepatic coagulation activation in mice with lipopolysaccharide/D‑galactosamine‑induced fulminant hepatitis. Mol Med Rep 2015; 12:6384-90. [PMID: 26260849 DOI: 10.3892/mmr.2015.4206] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2014] [Accepted: 07/28/2015] [Indexed: 11/06/2022] Open
Abstract
Metformin is a widely‑used antidiabetic drug with hypoglycemic activity and previously described anti‑inflammatory properties. Previous studies have demonstrated that metformin attenuates endotoxic hepatitis, however the mechanisms remain unclear. Inflammation and coagulation are closely associated pathological processes, therefore the potential effects of metformin on key steps in activation of the coagulation system were further investigated in endotoxic hepatitis induced by lipopolysaccharide/D‑galactosamine (LPS/D‑Gal). The current study demonstrated that treatment with metformin significantly suppressed the upregulation of tissue factor and plasminogen activator inhibitor‑1 in LPS/D‑Gal‑exposed mice. In addition, a reduction in the expression of interleukin 6 and inhibition of nuclear translocation of nuclear factor‑κB were observed. These data indicate that the LPS/D‑Gal‑induced elevation of the stable protein level of hypoxia inducible factor 1α, the mRNA level of erythropoietin, vascular endothelial growth factor and matrix metalloproteinase‑3, and the hepatic level of lactic acid were also suppressed by metformin. The current study indicates that the suppressive effects of metformin on inflammation‑induced coagulation may be an additional mechanism underlying the hepatoprotective effects of metformin in mice with LPS/D‑Gal‑induced fulminant hepatitis.
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Affiliation(s)
- Xianqiong Gong
- Department of Liver Diseases, Hepatology Center, Xiamen Hospital of Traditional Chinese Medicine, Xiamen, Fujian 361000, P.R. China
| | - Rui Duan
- Department of General Surgery, The First People's Hospital of Jingmen, Jingmen, Hubei 448000, P.R. China
| | - Jin-E Ao
- Department of Pathology, The First People's Hospital of Jingmen, Jingmen, Hubei 448000, P.R. China
| | - Qing Ai
- Department of Physiology, Chongqing Medical University, Chongqing 400016, P.R. China
| | - Pu Ge
- Department of Pathophysiology, Chongqing Medical University, Chongqing 400016, P.R. China
| | - Ling Lin
- Department of Pathophysiology, Chongqing Medical University, Chongqing 400016, P.R. China
| | - Li Zhang
- Department of Pathophysiology, Chongqing Medical University, Chongqing 400016, P.R. China
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21
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Réeff J, Oprenyeszk F, Franck T, Goole J, De Vriese C, Serteyn D, Henrotin Y, Amighi K. Development and evaluation in vitro and in vivo of injectable hydrolipidic gels with sustained-release properties for the management of articular pathologies such as osteoarthritis. Int J Pharm 2015; 490:74-84. [PMID: 25934426 DOI: 10.1016/j.ijpharm.2015.04.064] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2015] [Revised: 04/23/2015] [Accepted: 04/24/2015] [Indexed: 11/17/2022]
Abstract
This study aimed to evaluate glycerol monooleate (GMO) as a carrier to develop viscoelastic and injectable sustained-release drug delivery systems. The potential pro- and antioxidant activity of the developed hydrolipidic gels were evaluated by measuring the production of ROS by polymorphonuclear leukocytes (PMNs). In addition, the biocompatibility and effectiveness of two selected gel candidates were evaluated in vivo by evaluating the benefit of a single intraarticular injection of these new treatments in a model of osteoarthritis in rabbits. The in vitro study demonstrated that the carrier F1 did not have a pro-oxidative effect and even protected PMNs against natural auto-activation, regardless of the incorporation of either clonidine chlorhydrate or betamethasone dipropionate. The in vivo study demonstrated that F1 and F1-BDP induced a loss of cartilage quality in comparison to the control and reference groups but that the lesions of cartilage observed were generally mild, with not much full-depth erosion. Moreover, no exacerbating inflammation was observed when considering the synovial membranes and the PGE2 and CRP levels. These results seemed to demonstrate that the sustained-release formulation based on GMO could be well-tolerated after intraarticular injection. Moreover, it could have the potential to prevent inflammatory conditions while sustaining drug activity locally over weeks.
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Affiliation(s)
- Jonathan Réeff
- Laboratory of Pharmaceutics and Biopharmaceutics, Université Libre de Bruxelles (ULB), Campus de la Plaine, BC B-1050 Brussels, Belgium
| | - Frederic Oprenyeszk
- Bone and Cartilage Research Unit (B.C.R.U.), Arthropôle Liège, University of Liège, Liège, Belgium
| | - Thierry Franck
- Center for Oxygen, Research and Development, Chemical Institute B6a, Sart Tilman, Liège, Belgium
| | - Jonathan Goole
- Laboratory of Pharmaceutics and Biopharmaceutics, Université Libre de Bruxelles (ULB), Campus de la Plaine, BC B-1050 Brussels, Belgium
| | - Carine De Vriese
- Laboratory of Pharmaceutics and Biopharmaceutics, Université Libre de Bruxelles (ULB), Campus de la Plaine, BC B-1050 Brussels, Belgium
| | - Didier Serteyn
- Center for Oxygen, Research and Development, Chemical Institute B6a, Sart Tilman, Liège, Belgium
| | - Yves Henrotin
- Bone and Cartilage Research Unit (B.C.R.U.), Arthropôle Liège, University of Liège, Liège, Belgium
| | - Karim Amighi
- Laboratory of Pharmaceutics and Biopharmaceutics, Université Libre de Bruxelles (ULB), Campus de la Plaine, BC B-1050 Brussels, Belgium.
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22
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Akasaki Y, Alvarez-Garcia O, Saito M, Caramés B, Iwamoto Y, Lotz MK. FoxO transcription factors support oxidative stress resistance in human chondrocytes. Arthritis Rheumatol 2015; 66:3349-58. [PMID: 25186470 DOI: 10.1002/art.38868] [Citation(s) in RCA: 158] [Impact Index Per Article: 17.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2013] [Accepted: 08/28/2014] [Indexed: 12/11/2022]
Abstract
OBJECTIVE A major signaling pathway that regulates cellular aging is the insulin/insulin-like growth factor 1 (IGF-1)/phosphatidylinositol 3-kinase (PI3K)/Akt/FoxO transcription factor axis. We previously observed that FoxO transcription factors are dysregulated in aged and OA cartilage. The objective of this study was to investigate the impact of down-regulated FoxO transcription factors on chondrocytes. METHODS Small interfering RNAs (siRNAs) targeting FOXO1 (siFOXO1) and FOXO3 (siFOXO3) were transfected into human articular chondrocytes. Cell viability following treatment with the oxidant tert-butyl-hydroperoxide (tBHP) was measured by MTT assay. Caspase 3/7 activation and apoptotic cells were examined. Gene and protein expression of antioxidant proteins and autophagy-related proteins and changes in inflammatory mediators following treatment with interleukin-1β were assessed. Cells transfected with FOXO plasmids were also analyzed. RESULTS Cell viability was significantly reduced by siFOXO after treatment with tBHP. Apoptosis accompanied by caspase activation was significantly increased in siFOXO-transfected chondrocytes. Knockdown of FOXO1 and FOXO1+3 resulted in significant reductions in levels of glutathione peroxidase 1 (GPX-1), catalase, light chain 3 (LC3), Beclin1, and sirtuin 1 (SIRT-1) proteins following treatment with tBHP. In contrast, the constitutive active form of FOXO3 increased cell viability while inducing GPX-1, Beclin1, and LC3 in response to tBHP. Expression and production of ADAMTS-4 and chemerin were significantly increased in siFOXO-transfected chondrocytes. CONCLUSION Reduced expression of FoxO transcription factors in chondrocytes increased susceptibility to cell death induced by oxidative stress. This was associated with reduced levels of antioxidant proteins and autophagy-related proteins. Our data provide evidence for a key role of FoxO transcription factors as regulators of chondrocyte oxidative stress resistance and tissue homeostasis.
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Affiliation(s)
- Yukio Akasaki
- The Scripps Research Institute, La Jolla, California
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23
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Brody LT. Knee osteoarthritis: Clinical connections to articular cartilage structure and function. Phys Ther Sport 2014; 16:301-16. [PMID: 25783021 DOI: 10.1016/j.ptsp.2014.12.001] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2014] [Revised: 11/26/2014] [Accepted: 12/03/2014] [Indexed: 12/14/2022]
Abstract
Articular cartilage is a unique biphasic material that supports a lifetime of compressive and shear forces across joints. When articular cartilage deteriorates, whether due to injury, wear and tear or normal aging, osteoarthritis and resultant pain can ensue. Understanding the basic science of the structure and biomechanics of articular cartilage can help clinicians guide their patients to appropriate activity and loading choices. The purpose of this article is to examine how articular cartilage structure and mechanics, may interact with risk factors to contribute to OA and how this interaction provides guidelines for intervention choices This paper will review the microstructure of articular cartilage, its mechanical properties and link this information to clinical decision making.
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Affiliation(s)
- Lori Thein Brody
- University of Wisconsin Hospital and Clinics, Research Park Clinic, 621 Science Drive, Madison, WI 53711, USA; Orthopaedic and Sports Science, Rocky Mountain University of Health Professions, 122 East 1700 South, Bldg. C, Provo, UT 84606, USA.
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Combination of ADMSCs and chondrocytes reduces hypertrophy and improves the functional properties of osteoarthritic cartilage. Osteoarthritis Cartilage 2014; 22:1894-901. [PMID: 25128628 DOI: 10.1016/j.joca.2014.07.028] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/13/2014] [Revised: 07/20/2014] [Accepted: 07/29/2014] [Indexed: 02/02/2023]
Abstract
OBJECTIVE To evaluate the therapeutic efficacy of Adipose derived MSCs (ADMSCs) in combination with chondrocytes in counteracting oxidative stress in chondrocytes in vitro and in rat model of osteoarthritis (OA). METHOD Cultured chondrocytes were exposed to oxidative stress with 200 μM Hydrogen peroxide (H2O2), followed by co-culture with ADMSCs or chondrocytes or combination of both cell types in a transwell culture system for 36 h. The cytoprotective effect was assessed by immunocytochemistry and gene expression analysis. In vivo study evaluated therapeutic effect of the above mentioned three treatments after transplantation in OA rats. RESULTS The Combination of ADMSCs + Chondrocytes decreased the extent of oxidative stress-induced damage of chondrocytes. Enhanced expression level of Acan and Collagen type-II alpha (Col2a1) with a correspondingly decreased expression of Collagen type-I alpha (Col1a1) and Matrix metallopeptidase 13 (Mmp13) was maximally observed in this group. Moreover, reduced count of annexin-V positive cells, Caspase (Casp3) gene expression and Lactate dehydrogenase (LDH) release with concomitantly enhanced viability and expression of proliferating cell nuclear antigen (PCNA) gene was observed. In vivo study showed that homing of cells and proteoglycan contents of knee joints were significantly better in ADMSCs + Chondrocytes transplanted rats. Increased expression of Acan and Col2a1 along with decreased expression of Col1a1 and Mmp13 indicated formation of hyaline cartilage in this group. These rats also demonstrated significantly reduced expression of Casp3 while increased expression of PCNA genes than the other cell transplanted groups. CONCLUSIONS Our results demonstrated that a combination of ADMSCs and chondrocytes may be a more effective therapeutic strategy against OA than the use of ADMSCs or chondrocytes separately.
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Akasaki Y, Alvarez-Garcia O, Saito M, Caramés B, Iwamoto Y, Lotz MK. FoxO transcription factors support oxidative stress resistance in human chondrocytes. ARTHRITIS & RHEUMATOLOGY (HOBOKEN, N.J.) 2014. [PMID: 25186470 DOI: 10.1002/art.38868.] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
OBJECTIVE A major signaling pathway that regulates cellular aging is the insulin/insulin-like growth factor 1 (IGF-1)/phosphatidylinositol 3-kinase (PI3K)/Akt/FoxO transcription factor axis. We previously observed that FoxO transcription factors are dysregulated in aged and OA cartilage. The objective of this study was to investigate the impact of down-regulated FoxO transcription factors on chondrocytes. METHODS Small interfering RNAs (siRNAs) targeting FOXO1 (siFOXO1) and FOXO3 (siFOXO3) were transfected into human articular chondrocytes. Cell viability following treatment with the oxidant tert-butyl-hydroperoxide (tBHP) was measured by MTT assay. Caspase 3/7 activation and apoptotic cells were examined. Gene and protein expression of antioxidant proteins and autophagy-related proteins and changes in inflammatory mediators following treatment with interleukin-1β were assessed. Cells transfected with FOXO plasmids were also analyzed. RESULTS Cell viability was significantly reduced by siFOXO after treatment with tBHP. Apoptosis accompanied by caspase activation was significantly increased in siFOXO-transfected chondrocytes. Knockdown of FOXO1 and FOXO1+3 resulted in significant reductions in levels of glutathione peroxidase 1 (GPX-1), catalase, light chain 3 (LC3), Beclin1, and sirtuin 1 (SIRT-1) proteins following treatment with tBHP. In contrast, the constitutive active form of FOXO3 increased cell viability while inducing GPX-1, Beclin1, and LC3 in response to tBHP. Expression and production of ADAMTS-4 and chemerin were significantly increased in siFOXO-transfected chondrocytes. CONCLUSION Reduced expression of FoxO transcription factors in chondrocytes increased susceptibility to cell death induced by oxidative stress. This was associated with reduced levels of antioxidant proteins and autophagy-related proteins. Our data provide evidence for a key role of FoxO transcription factors as regulators of chondrocyte oxidative stress resistance and tissue homeostasis.
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Affiliation(s)
- Yukio Akasaki
- The Scripps Research Institute, La Jolla, California
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26
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Jang KW, Buckwalter JA, Martin JA. Inhibition of cell-matrix adhesions prevents cartilage chondrocyte death following impact injury. J Orthop Res 2014; 32:448-54. [PMID: 24249698 PMCID: PMC4034578 DOI: 10.1002/jor.22523] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/05/2013] [Accepted: 10/21/2013] [Indexed: 02/04/2023]
Abstract
Focal adhesions are transmembrane protein complexes that attach chondrocytes to the pericellular cartilage matrix and in turn, are linked to intracellular organelles via cytoskeleton. We previously found that excessive compression of articular cartilage leads to cytoskeleton-dependent chondrocyte death. Here we tested the hypothesis that this process also requires integrin activation and signaling via focal adhesion kinase (FAK) and Src family kinase (SFK). Osteochondral explants were treated with FAK and SFK inhibitors (FAKi, SFKi, respectively) for 2 h and then subjected to a death-inducing impact load. Chondrocyte viability was assessed by confocal microscopy immediately and at 24 h post-impact. With no treatment immediate post-impact viability was 59%. Treatment with 10 µM SFKi, 10 μM, or 100 µM FAKi improved viability to 80%, 77%, and 82%, respectively (p < 0.05). After 24 h viability declined to 34% in controls, 48% with 10 µM SFKi, 45% with 10 µM FAKi, and 56% with 100 µM FAKi (p < 0.01) treatment. These results confirmed that most of the acute chondrocyte mortality was FAK- and SFK-dependent, which implicates integrin-cytoskeleton interactions in the death signaling pathway. Together with previous findings, these data support the hypothesis that the excessive tissue strains accompanying impact loading induce death via a pathway initiated by strain on cell adhesion receptors.
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Affiliation(s)
- Kee W. Jang
- Department of Orthopaedics and Rehabilitation, The University of Iowa, Iowa City, IA,Department of Biomedical Engineering, The University of Iowa, Iowa City, IA
| | - Joseph A. Buckwalter
- Department of Orthopaedics and Rehabilitation, The University of Iowa, Iowa City, IA,Veterans Affairs Medical Center, Iowa City, IA
| | - James A. Martin
- Department of Orthopaedics and Rehabilitation, The University of Iowa, Iowa City, IA
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Leong DJ, Choudhury M, Hirsh DM, Hardin JA, Cobelli NJ, Sun HB. Nutraceuticals: potential for chondroprotection and molecular targeting of osteoarthritis. Int J Mol Sci 2013; 14:23063-85. [PMID: 24284399 PMCID: PMC3856106 DOI: 10.3390/ijms141123063] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2013] [Revised: 10/30/2013] [Accepted: 11/01/2013] [Indexed: 12/13/2022] Open
Abstract
Osteoarthritis (OA) is a degenerative joint disease and a leading cause of adult disability. There is no cure for OA, and no effective treatments which arrest or slow its progression. Current pharmacologic treatments such as analgesics may improve pain relief but do not alter OA disease progression. Prolonged consumption of these drugs can result in severe adverse effects. Given the nature of OA, life-long treatment will likely be required to arrest or slow its progression. Consequently, there is an urgent need for OA disease-modifying therapies which also improve symptoms and are safe for clinical use over long periods of time. Nutraceuticals-food or food products that provide medical or health benefits, including the prevention and/or treatment of a disease-offer not only favorable safety profiles, but may exert disease- and symptom-modification effects in OA. Forty-seven percent of OA patients use alternative medications, including nutraceuticals. This review will overview the efficacy and mechanism of action of commonly used nutraceuticals, discuss recent experimental and clinical data on the effects of select nutraceuticals, such as phytoflavonoids, polyphenols, and bioflavonoids on OA, and highlight their known molecular actions and limitations of their current use. We will conclude with a proposed novel nutraceutical-based molecular targeting strategy for chondroprotection and OA treatment.
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Affiliation(s)
- Daniel J. Leong
- Department of Orthopaedic Surgery, Albert Einstein College of Medicine and Montefiore Medical Center, Bronx, NY 10461, USA; E-Mails: (D.J.L.); (M.C.); (D.M.H.); (J.A.H.); (N.J.C.)
- Department of Radiation Oncology, Albert Einstein College of Medicine and Montefiore Medical Center, 1300 Morris Park Avenue, Golding 101, Bronx, NY 10461, USA
| | - Marwa Choudhury
- Department of Orthopaedic Surgery, Albert Einstein College of Medicine and Montefiore Medical Center, Bronx, NY 10461, USA; E-Mails: (D.J.L.); (M.C.); (D.M.H.); (J.A.H.); (N.J.C.)
- Department of Radiation Oncology, Albert Einstein College of Medicine and Montefiore Medical Center, 1300 Morris Park Avenue, Golding 101, Bronx, NY 10461, USA
| | - David M. Hirsh
- Department of Orthopaedic Surgery, Albert Einstein College of Medicine and Montefiore Medical Center, Bronx, NY 10461, USA; E-Mails: (D.J.L.); (M.C.); (D.M.H.); (J.A.H.); (N.J.C.)
| | - John A. Hardin
- Department of Orthopaedic Surgery, Albert Einstein College of Medicine and Montefiore Medical Center, Bronx, NY 10461, USA; E-Mails: (D.J.L.); (M.C.); (D.M.H.); (J.A.H.); (N.J.C.)
| | - Neil J. Cobelli
- Department of Orthopaedic Surgery, Albert Einstein College of Medicine and Montefiore Medical Center, Bronx, NY 10461, USA; E-Mails: (D.J.L.); (M.C.); (D.M.H.); (J.A.H.); (N.J.C.)
| | - Hui B. Sun
- Department of Orthopaedic Surgery, Albert Einstein College of Medicine and Montefiore Medical Center, Bronx, NY 10461, USA; E-Mails: (D.J.L.); (M.C.); (D.M.H.); (J.A.H.); (N.J.C.)
- Department of Radiation Oncology, Albert Einstein College of Medicine and Montefiore Medical Center, 1300 Morris Park Avenue, Golding 101, Bronx, NY 10461, USA
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D’Lima DD. Inflammatory events in cartilage in early stages of femoroacetabular impingement: Commentary on an article by Shingo Hashimoto, MD, PhD, et al.: "Molecular characterization of articular cartilage from young adults with femoroacetabular impingement". J Bone Joint Surg Am 2013; 95:e121(1-2). [PMID: 23965714 PMCID: PMC3748994 DOI: 10.2106/jbjs.m.00722] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- Darryl D. D’Lima
- Shiley Center for Orthopaedic Research & Education
at Scripps Clinic, La Jolla, California
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Strain-dependent oxidant release in articular cartilage originates from mitochondria. Biomech Model Mechanobiol 2013; 13:565-72. [PMID: 23896937 DOI: 10.1007/s10237-013-0518-8] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2013] [Accepted: 07/18/2013] [Indexed: 12/29/2022]
Abstract
Mechanical loading is essential for articular cartilage homeostasis and plays a central role in the cartilage pathology, yet the mechanotransduction processes that underlie these effects remain unclear. Previously, we showed that lethal amounts of reactive oxygen species (ROS) were liberated from the mitochondria in response to mechanical insult and that chondrocyte deformation may be a source of ROS. To this end, we hypothesized that mechanically induced mitochondrial ROS is related to the magnitude of cartilage deformation. To test this, we measured axial tissue strains in cartilage explants subjected to semi-confined compressive stresses of 0, 0.05, 0.1, 0.25, 0.5, or 1.0 MPa. The presence of ROS was then determined by confocal imaging with dihydroethidium, an oxidant sensitive fluorescent probe. Our results indicated that ROS levels increased linearly relative to the magnitude of axial strains (r(2) = 0.87, p < 0.05), and significant cell death was observed at strains >40%. By contrast, hydrostatic stress, which causes minimal tissue strain, had no significant effect. Cell-permeable superoxide dismutase mimetic Mn(III)tetrakis (1-methyl-4-pyridyl) porphyrin pentachloride significantly decreased ROS levels at 0.5 and 0.25 MPa. Electron transport chain inhibitor, rotenone, and cytoskeletal inhibitor, cytochalasin B, significantly decreased ROS levels at 0.25 MPa. Our findings strongly suggest that ROS and mitochondrial oxidants contribute to cartilage mechanobiology.
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30
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Ueng SWN, Yuan LJ, Lin SS, Niu CC, Chan YS, Wang IC, Yang CY, Chen WJ. Hyperbaric oxygen treatment prevents nitric oxide-induced apoptosis in articular cartilage injury via enhancement of the expression of heat shock protein 70. J Orthop Res 2013; 31:376-84. [PMID: 22991091 DOI: 10.1002/jor.22235] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/12/2012] [Accepted: 08/27/2012] [Indexed: 02/04/2023]
Abstract
Heat shock proteins (HSPs), inflammatory cytokines, nitric oxide (NO), and localized hypoxia-induced apoptosis are thought to be correlated to the degree of cartilage injury. We investigated the effect of hyperbaric oxygen (HBO) on (1) interleukin-1β (IL-1β)-induced NO production and apoptosis of rabbit chondrocytes and (2) healing of articular cartilage defects. For the in vitro study, RT-PCR and Western blotting were performed to detect mRNA and protein expressions of HSP70, inducible NO synthase (iNOS), and caspase 3 in IL-1β-treated chondrocytes. To clarify that the HSP70 was necessary for anti-iNOS and anti-apoptotic activity by HBO, we treated the cells with an HSP70 inhibitor, KNK437. For the in vivo study, cartilage defects were created in rabbits. The HBO group was exposed to 100% oxygen at 2.5 ATA for 1.5 h a day for 10 weeks. The control group was exposed to normal air. After sacrifice, specimen sections were sent for examination using a scoring system. Immunohistochemical analyses were performed to detect the expressions of iNOS, HSP70, and caspase 3. Our results suggested that HBO upregulated the mRNA and protein expressions of HSP70 and suppressed those of iNOS and caspase 3 in chondrocytes. KNK437 inhibited the HBO-induced downregulation of iNOS and casapase 3 activities. The histological scores showed that HBO markedly enhanced cartilage repair. Immunohistostaining showed that HBO enhanced HSP70 expression and suppressed iNOS and caspase 3 expressions in chondrocytes. Accordingly, HBO treatment prevents NO-induced apoptosis in articular cartilage injury via enhancement of the expression of heat shock protein 70.
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Affiliation(s)
- Steve W N Ueng
- Department of Orthopaedic Surgery and Hyperbaric Oxygen Therapy Center, Chang Gung Memorial Hospital, Kweishan, Taoyuan, Taiwan.
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Pedersen DR, Goetz JE, Kurriger GL, Martin JA. Comparative digital cartilage histology for human and common osteoarthritis models. Orthop Res Rev 2013; 2013:13-20. [PMID: 24465137 DOI: 10.2147/orr.s38400] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
PURPOSE This study addresses the species-specific and site-specific details of weight-bearing articular cartilage zone depths and chondrocyte distributions among humans and common osteoarthritis (OA) animal models using contemporary digital imaging tools. Histological analysis is the gold-standard research tool for evaluating cartilage health, OA severity, and treatment efficacy. Historically, evaluations were made by expert analysts. However, state-of-the-art tools have been developed that allow for digitization of entire histological sections for computer-aided analysis. Large volumes of common digital cartilage metrics directly complement elucidation of trends in OA inducement and concomitant potential treatments. MATERIALS AND METHODS Sixteen fresh human knees, 26 adult New Zealand rabbit stifles, and 104 bovine lateral plateaus were measured for four cartilage zones and the cell densities within each zone. Each knee was divided into four weight-bearing sites: the medial and lateral plateaus and femoral condyles. RESULTS One-way analysis of variance followed by pairwise multiple comparisons (Holm-Sidak method at a significance of 0.05) clearly confirmed the variability between cartilage depths at each site, between sites in the same species, and between weight-bearing articular cartilage definitions in different species. CONCLUSION The present study clearly demonstrates multisite, multispecies differences in normal weight-bearing articular cartilage, which can be objectively quantified by a common digital histology imaging technique. The clear site-specific differences in normal cartilage must be taken into consideration when characterizing the pathoetiology of OA models. Together, these provide a path to consistently analyze the volume and variety of histologic slides necessarily generated by studies of OA progression and potential treatments in different species.
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Affiliation(s)
- Douglas R Pedersen
- Department of Orthopaedics and Rehabilitation, University of Iowa, Iowa City, IA, USA
| | - Jessica E Goetz
- Department of Orthopaedics and Rehabilitation, University of Iowa, Iowa City, IA, USA
| | - Gail L Kurriger
- Department of Orthopaedics and Rehabilitation, University of Iowa, Iowa City, IA, USA
| | - James A Martin
- Department of Orthopaedics and Rehabilitation, University of Iowa, Iowa City, IA, USA
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32
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Wolff KJ, Ramakrishnan PS, Brouillette MJ, Journot B, Mckinley TO, Buckwalter JA, Martin JA. Mechanical stress and ATP synthesis are coupled by mitochondrial oxidants in articular cartilage. J Orthop Res 2013; 31:191-6. [PMID: 22930474 PMCID: PMC3678272 DOI: 10.1002/jor.22223] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/20/2012] [Accepted: 08/07/2012] [Indexed: 02/04/2023]
Abstract
Metabolic adaptation of articular cartilage under joint loading is evident and matrix synthesis seems to be critically tied to ATP. Chondrocytes utilize the glycolytic pathway for energy requirements but seem to require mitochondrial reactive oxygen species (ROS) to sustain ATP synthesis. The role of ROS in regulating ATP reserves under a mechanically active environment is not clear. It is believed that physiological strains cause deformation of the mitochondria, potentially releasing ROS for energy production. We hypothesized that mechanical loading stimulates ATP synthesis via mitochondrial release of ROS. Bovine osteochondral explants were dynamically loaded at 0.5 Hz with amplitude of 0.25 MPa for 1 h. Cartilage response to mechanical loading was assessed by imaging with dihydroethidium (ROS indicator) and a Luciferase-based ATP assay. Electron transport inhibitor rotenone and mitochondrial ROS scavenger MitoQ significantly suppressed mechanically induced ROS production and ATP synthesis. Our findings indicate that mitochondrial ROS are produced as a result of physiological mechanical strains. Taken together with our previous findings of ROS involvement in blunt impact injuries, mitochondrial ROS are important contributors to cartilage metabolic adaptation and their precise role in the pathogenesis of osteoarthritis warrants further investigation.
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Affiliation(s)
| | - Prem S Ramakrishnan
- Ignacio Ponsetti Orthopaedic Cell Biology Lab Department of Orthopaedics and Rehabilitation, University of Iowa, Iowa City
| | - Marc J Brouillette
- Biomedical Engineering, University of Iowa,Ignacio Ponsetti Orthopaedic Cell Biology Lab Department of Orthopaedics and Rehabilitation, University of Iowa, Iowa City
| | - Brice Journot
- Biomedical Engineering, University of Iowa,Ignacio Ponsetti Orthopaedic Cell Biology Lab Department of Orthopaedics and Rehabilitation, University of Iowa, Iowa City
| | - Todd O Mckinley
- Ignacio Ponsetti Orthopaedic Cell Biology Lab Department of Orthopaedics and Rehabilitation, University of Iowa, Iowa City
| | - JA Buckwalter
- Ignacio Ponsetti Orthopaedic Cell Biology Lab Department of Orthopaedics and Rehabilitation, University of Iowa, Iowa City,Veterans Affairs Medical Center, Iowa City, Iowa
| | - James A Martin
- Ignacio Ponsetti Orthopaedic Cell Biology Lab Department of Orthopaedics and Rehabilitation, University of Iowa, Iowa City
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Tochigi Y, Zhang P, Rudert MJ, Baer TE, Martin JA, Hillis SL, Brown TD. A novel impaction technique to create experimental articular fractures in large animal joints. Osteoarthritis Cartilage 2013; 21:200-8. [PMID: 23069855 PMCID: PMC3538937 DOI: 10.1016/j.joca.2012.10.004] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/14/2012] [Revised: 09/22/2012] [Accepted: 10/04/2012] [Indexed: 02/02/2023]
Abstract
OBJECTIVE A novel impaction fracture insult technique, developed for modeling post-traumatic osteoarthritis in porcine hocks in vivo, was tested to determine the extent to which it could replicate the cell-level cartilage pathology in human clinical intra-articular fractures. DESIGN Eight fresh porcine hocks (whole-joint specimens with fully viable chondrocytes) were subjected to fracture insult. From the fractured distal tibial surfaces, osteoarticular fragments were immediately sampled and cultured in vitro for 48 h. These samples were analyzed for the distribution and progression of chondrocyte death, using the Live/Dead assay. Five control joints, in which "fractures" were simulated by means of surgical osteotomy, were also similarly analyzed. RESULTS In the impaction-fractured joints, chondrocyte death was concentrated in regions adjacent to fracture lines (near-fracture regions), as evidenced by fractional cell death significantly higher (P < 0.0001) than in central non-fracture (control) regions. Although nominally similar spatial distribution patterns were identified in the osteotomized joints, fractional cell death in the near-osteotomy regions was nine-fold lower (P < 0.0001) than in the near-fracture regions. Cell death in the near-fracture regions increased monotonically during 48 h after impaction, dominantly within 1 mm from the fracture lines. CONCLUSION The impaction-fractured joints exhibited chondrocyte death characteristics reasonably consistent with those in human intra-articular fractures, but were strikingly different from those in "fractures" simulated by surgical osteotomy. These observations support promise of this new impaction fracture technique as a mechanical insult modality to replicate the pathophysiology of human intra-articular fractures in large animal joints in vivo.
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Affiliation(s)
- Yuki Tochigi
- Department of Orthopaedics and Rehabilitation, University of Iowa,
| | - Peng Zhang
- Department of Orthopaedics and Rehabilitation, University of Iowa, and Department of Orthopaedics, Affiliated Hospital of Shan Dong University of Traditional Chinese Medicine,
| | - M. James Rudert
- Department of Orthopaedics and Rehabilitation, University of Iowa,
| | - Thomas E. Baer
- Department of Orthopaedics and Rehabilitation, University of Iowa,
| | - James A. Martin
- Department of Orthopaedics and Rehabilitation, University of Iowa,
| | - Stephen L. Hillis
- Department of Biostatistics, University of Iowa, and Center for Research in the Implementation of Innovative Strategies in Practice (CRIISP), VA Iowa City Medical Center,
| | - Thomas D. Brown
- Department of Orthopaedics and Rehabilitation, and Department of Biomedical Engineering, University of Iowa,
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Pei M, Zhang Y, Li J, Chen D. Antioxidation of decellularized stem cell matrix promotes human synovium-derived stem cell-based chondrogenesis. Stem Cells Dev 2012; 22:889-900. [PMID: 23092115 DOI: 10.1089/scd.2012.0495] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
Clinical treatment of cartilage defects is challenging due to concomitant post-traumatic joint inflammation. This study was to demonstrate that the antioxidant ability of human adult synovium-derived stem cells (SDSCs) could be enhanced by ex vivo expansion on a decellularized stem cell matrix (DSCM). Microarray was used to evaluate oxidative, antioxidative, and chondrogenic status in SDSCs after expansion on the DSCM and induction in the chondrogenic medium. Hydrogen peroxide (H2O2) was added to create oxidative stress in either expanded SDSCs or chondrogenically induced premature pellets. The effect of H2O2 on SDSC proliferation was evaluated using flow cytometry. Chondrogenic differentiation of expanded SDSCs was evaluated using histology, immunostaining, biochemical analysis, and real-time polymerase chain reaction. Mitogen-activated protein kinase signaling pathways and p21 were compared in the DSCM and plastic-flask-expanded SDSCs with or without H2O2 treatment. We found that expansion on the DSCM upregulated antioxidative gene levels and chondrogenic potential in human SDSCs (hSDSCs), retarded the decrease in the cell number and the increase in apoptosis, and rendered SDSCs resistant to cell-cycle G1 arrest resulting from H2O2 treatment. Treatment with 0.05 mM H2O2 during cell expansion yielded pellets with increased chondrogenic differentiation; treatment in premature SDSC pellets showed that the DSCM-expanded cells had a robust resistance to H2O2-induced oxidative stress. Extracellular signal-regulated kinases 1 and 2 and p38 were positively involved in antioxidative and chondrogenic potential in SDSCs expanded on the DSCM in which p21 was downregulated. DSCM could be a promising cell expansion system to provide a large number of high-quality hSDSCs for cartilage regeneration in a harsh joint environment.
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Affiliation(s)
- Ming Pei
- Stem Cell and Tissue Engineering Laboratory, Department of Orthopaedics, West Virginia University, Morgantown, WV 26506-9196, USA.
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Farnsworth NL, Antunez LR, Bryant SJ. Influence of chondrocyte maturation on acute response to impact injury in PEG hydrogels. J Biomech 2012; 45:2556-63. [DOI: 10.1016/j.jbiomech.2012.07.035] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2012] [Revised: 07/05/2012] [Accepted: 07/24/2012] [Indexed: 12/21/2022]
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Issa RI, Griffin TM. Pathobiology of obesity and osteoarthritis: integrating biomechanics and inflammation. PATHOBIOLOGY OF AGING & AGE RELATED DISEASES 2012; 2. [PMID: 22662293 PMCID: PMC3364606 DOI: 10.3402/pba.v2i0.17470] [Citation(s) in RCA: 87] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Obesity is a significant risk factor for developing osteoarthritis in weight-bearing and non-weight-bearing joints. Although the pathogenesis of obesity-associated osteoarthritis is not completely understood, recent studies indicate that pro-inflammatory metabolic factors contribute to an increase in osteoarthritis risk. Adipose tissue, and in particular infrapatellar fat, is a local source of pro-inflammatory mediators that are increased with obesity and have been shown to increase cartilage degradation in cell and tissue culture models. One adipokine in particular, leptin, may be a critical mediator of obesity-associated osteoarthritis via synergistic actions with other inflammatory cytokines. Biomechanical factors may also increase the risk of osteoarthritis by activating cellular inflammation and promoting oxidative stress. However, some types of biomechanical stimulation, such as physiologic cyclic loading, inhibit inflammation and protect against cartilage degradation. A high percentage of obese individuals with knee osteoarthritis are sedentary, suggesting that a lack of physical activity may increase the susceptibility to inflammation. A more comprehensive approach to understanding how obesity alters daily biomechanical exposures within joint tissues may provide new insight into the protective and damaging effects of biomechanical factors on inflammation in osteoarthritis.
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Affiliation(s)
- Rita I Issa
- Free Radical Biology and Aging Research Program, Oklahoma Medical Research Foundation, Oklahoma City, OK, USA
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37
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Martin JA, Martini A, Molinari A, Morgan W, Ramalingam W, Buckwalter JA, McKinley TO. Mitochondrial electron transport and glycolysis are coupled in articular cartilage. Osteoarthritis Cartilage 2012; 20:323-9. [PMID: 22305999 PMCID: PMC3634328 DOI: 10.1016/j.joca.2012.01.003] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/29/2010] [Revised: 12/06/2011] [Accepted: 01/10/2012] [Indexed: 02/02/2023]
Abstract
OBJECTIVE Although the majority of the adenosine triphosphate (ATP) in chondrocytes is made by glycolysis rather than by oxidative phosphorylation in mitochondria there is evidence to suggest that reactive oxygen species produced by mitochondrial electron transport (ET) help to maintain cellular redox balance in favor of glycolysis. The objective of this study was to test this hypothesis by determining if rotenone, which inhibits ET and blocks oxidant production inhibits glycolytic ATP synthesis. DESIGN Bovine osteochondral explants were treated with rotenone, an ET inhibitor; or oligomycin an ATP synthase inhibitor; or 2-fluoro-2-deoxy-D-glucose, a glycolysis inhibiter; or peroxide, an exogenous oxidant; or mitoquinone (MitoQ), a mitochondria-targeted anti-oxidant. Cartilage extracts were assayed for ATP, nicotine adenine dinucleotide (NAD+/H), and culture medium was assayed for pyruvate and lactate after 24 h of treatment. Imaging studies were used to measure superoxide production in cartilage. RESULTS Rotenone and 2-FG caused a significant decline in cartilage ATP (P < 0.001). In contrast, ATP levels were not affected by oligomycin. Peroxide treatment blocked rotenone effects on ATP, while treatment with MitoQ significantly suppressed ATP levels. Rotenone and 2-FG caused a significant decline in pyruvate, but not in lactate production. NADH:NAD+ ratios decreased significantly in both rotenone and 2-FG-treated explants (P < 0.05). Rotenone also significantly reduced superoxide production. CONCLUSIONS These findings showing a link between glycolysis and ET are consistent with previous reports on the critical need for oxidants to support normal chondrocyte metabolism. They suggest a novel role for mitochondria in cartilage homeostasis that is independent of oxidative phosphorylation.
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Affiliation(s)
- James A. Martin
- Department of Orthopaedics and Rehabilitation, University of Iowa Hospitals and Clinics, Iowa City, Iowa, USA,Corresponding author. 500 Newton Road, 1182 Medical Laboratories, Iowa City, Iowa 52242, USA
| | - Anne Martini
- Department of Orthopaedics and Rehabilitation, University of Iowa Hospitals and Clinics, Iowa City, Iowa, USA
| | - Alexander Molinari
- Department of Orthopaedics and Rehabilitation, University of Iowa Hospitals and Clinics, Iowa City, Iowa, USA
| | - Walter Morgan
- Department of Orthopaedics and Rehabilitation, University of Iowa Hospitals and Clinics, Iowa City, Iowa, USA
| | - Wendy Ramalingam
- Department of Orthopaedics and Rehabilitation, University of Iowa Hospitals and Clinics, Iowa City, Iowa, USA
| | - Joseph A. Buckwalter
- Department of Orthopaedics and Rehabilitation, University of Iowa Hospitals and Clinics, Iowa City, Iowa, USA,Veterans Affaires Medical Center, Iowa City, Iowa
| | - Todd O. McKinley
- Department of Orthopaedics and Rehabilitation, University of Iowa Hospitals and Clinics, Iowa City, Iowa, USA
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Graham JM, Ayati BP, Ding L, Ramakrishnan PS, Martin JA. Reaction-diffusion-delay model for EPO/TNF-α interaction in articular cartilage lesion abatement. Biol Direct 2012; 7:9. [PMID: 22353555 PMCID: PMC3356234 DOI: 10.1186/1745-6150-7-9] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2011] [Accepted: 02/21/2012] [Indexed: 01/22/2023] Open
Abstract
Background Injuries to articular cartilage result in the development of lesions that form on the surface of the cartilage. Such lesions are associated with articular cartilage degeneration and osteoarthritis. The typical injury response often causes collateral damage, primarily an effect of inflammation, which results in the spread of lesions beyond the region where the initial injury occurs. Results and discussion We present a minimal mathematical model based on known mechanisms to investigate the spread and abatement of such lesions. The first case corresponds to the parameter values listed in Table 1, while the second case has parameter values as in Table 2. In particular we represent the "balancing act" between pro-inflammatory and anti-inflammatory cytokines that is hypothesized to be a principal mechanism in the expansion properties of cartilage damage during the typical injury response. We present preliminary results of in vitro studies that confirm the anti-inflammatory activities of the cytokine erythropoietin (EPO). We assume that the diffusion of cytokines determine the spatial behavior of injury response and lesion expansion so that a reaction diffusion system involving chemical species and chondrocyte cell state population densities is a natural way to represent cartilage injury response. We present computational results using the mathematical model showing that our representation is successful in capturing much of the interesting spatial behavior of injury associated lesion development and abatement in articular cartilage. Further, we discuss the use of this model to study the possibility of using EPO as a therapy for reducing the amount of inflammation induced collateral damage to cartilage during the typical injury response. Conclusions The mathematical model presented herein suggests that not only are anti-inflammatory cy-tokines, such as EPO necessary to prevent chondrocytes signaled by pro-inflammatory cytokines from entering apoptosis, they may also influence how chondrocytes respond to signaling by pro-inflammatory cytokines. Reviewers This paper has been reviewed by Yang Kuang, James Faeder and Anna Marciniak-Czochra.
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Affiliation(s)
- Jason M Graham
- Department of Mathematics/Program in Applied Mathematical and Computational Sciences, University of Iowa, Iowa City, IA, USA.
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Buckwalter JA. The role of mechanical forces in the initiation and progression of osteoarthritis. HSS J 2012; 8:37-8. [PMID: 23372526 PMCID: PMC3295944 DOI: 10.1007/s11420-011-9251-y] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/25/2011] [Accepted: 11/17/2011] [Indexed: 02/07/2023]
Affiliation(s)
- Joseph A. Buckwalter
- Department of Orthopaedics and Rehabilitation, University of Iowa, 1008-A JPP 200 Hawkins Drive, Iowa City, IA 52242 USA
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Caramés B, Taniguchi N, Seino D, Blanco FJ, D'Lima D, Lotz M. Mechanical injury suppresses autophagy regulators and pharmacologic activation of autophagy results in chondroprotection. ACTA ACUST UNITED AC 2011; 64:1182-92. [PMID: 22034068 DOI: 10.1002/art.33444] [Citation(s) in RCA: 112] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
OBJECTIVE Mechanical injury induces cell death in cartilage and triggers a remodeling process that ultimately can manifest as osteoarthritis. Autophagy is a process for turnover of intracellular organelles and macromolecules that protects cells during stress responses. This study was undertaken to determine changes in and functions of autophagy following mechanical injury to cartilage. METHODS Bovine and human cartilage explants were subjected to mechanical impact (40% strain for 500 msec). Cell viability, sulfated glycosaminoglycan (sGAG) release, and changes in the levels of the autophagy markers ULK1, beclin 1, and microtubule-associated protein 1 light chain 3 (LC3) were evaluated. Cartilage explants were treated with the mammalian target of rapamycin complex 1 (mTORC-1) inhibitor and the autophagy inducer rapamycin and tested for protective effects against mechanical injury. Explants were also treated with the cell death inducers nitric oxide and tumor necrosis factor α (TNFα) plus actinomycin D, and the proinflammatory cytokine interleukin-1α (IL-1α). RESULTS Mechanical injury induced cell death and loss of sGAG in a time-dependent manner. This was associated with significantly decreased ULK1, beclin 1, and LC3 expression in the cartilage superficial zone (P < 0.05) 48 hours after injury. The levels of LC3-II were increased 24 hours after injury but decreased at 48 and 96 hours. Rapamycin enhanced expression of autophagy regulators and prevented cell death and sGAG loss in mechanically injured explants. Rapamycin also protected against cell death induced by sodium nitroprusside and TNFα plus actinomycin D and prevented sGAG loss induced by IL-1α. CONCLUSION Our findings indicate that mechanical injury leads to suppression of autophagy, predominantly in the superficial zone where most of the cell death occurs. Pharmacologic inhibition of mTORC-1, at least in part by enhancement of autophagy, prevents cell and matrix damage, suggesting a novel approach for chondroprotection.
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Affiliation(s)
- Beatriz Caramés
- The Scripps Research Institute, La Jolla, California 92037, USA
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41
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Kramer WC, Hendricks KJ, Wang J. Pathogenetic mechanisms of posttraumatic osteoarthritis: opportunities for early intervention. Int J Clin Exp Med 2011; 4:285-298. [PMID: 22140600 PMCID: PMC3228584] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2011] [Accepted: 10/16/2011] [Indexed: 05/31/2023]
Abstract
Osteoarthritis (OA) is characterized by joint pain and stiffness with radiographic evidence of joint space narrowing, osteophytes, and subchondral bone sclerosis. Posttraumatic OA (PTOA) arises from joint trauma, which accounts for a fraction of all patients with OA. Articular cartilage breakdown can occur soon or for years after a joint injury. Even with the current care of joint injuries, such as anatomic reduction and rigid fixation of intra-articular fractures and reconstruction of ruptured ligaments with successful restoration of joint biomechanics, the risk of PTOA after joint injuries ranges from 20% to more than 50%. The time course for the progression of PTOA is highly variable and risk of PTOA increases with patient age at the time of joint injury, suggesting that biologic factors may be involved in the progression of PTOA. Therapeutic options are limited due largely to the lack of information on the mechanisms underlying the progression of PTOA. This review summarizes the current studies on the pathogenetic mechanisms of PTOA, with a main focus on the metabolic changes in articular cartilage in the acute posttraumatic phase and the early chronic phase, a clinically asymptomatic period. Recent studies have revealed that mechanical damage to the articular tissues may lead to changes in gene expression and cartilage metabolism, which could trigger a cascade of events leading to degradation of articular cartilage and pathologic changes in other joint tissues. Understanding the mechanobiologic, molecular and cellular changes that lead to continued cartilage degradation in the relatively early phases after joint injury may open up new opportunities for early clinical intervention.
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Affiliation(s)
- William C Kramer
- Department of Orthopedic Surgery, University of Kansas Medical Center3901 Rainbow Boulevard, Kansas City, Kansas 66160, USA
| | - Kelly J Hendricks
- Department of Orthopedic Surgery, University of Kansas Medical Center3901 Rainbow Boulevard, Kansas City, Kansas 66160, USA
| | - Jinxi Wang
- Department of Orthopedic Surgery, University of Kansas Medical Center3901 Rainbow Boulevard, Kansas City, Kansas 66160, USA
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Brandl A, Hartmann A, Bechmann V, Graf B, Nerlich M, Angele P. Oxidative stress induces senescence in chondrocytes. J Orthop Res 2011; 29:1114-20. [PMID: 21284033 DOI: 10.1002/jor.21348] [Citation(s) in RCA: 107] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/18/2010] [Accepted: 12/09/2010] [Indexed: 02/04/2023]
Abstract
Cellular senescence is a program activated during diverse situations of cell stress. Chondrocytes differ from other somatic cells as articular cartilage is an avascular tissue. The effects of oxidative stress on chondrocytes are still unknown. Our studies were to investigate into the proliferation potential, cytological features and the telomere linked stress response system of human osteoarthritic chondrocytes, subjected to acute or prolonged oxidant challenge with hydrogen peroxide. Telomere length was measured using the telomere restriction fragment assay, gene expression was determined by RT-PCR. Sub-lethal doses of oxidative stress induced cell-cycle arrest, senescent-morphological features and senescence-associated β-galactosidase positivity. Prolonged oxidative treatment had no effects on cell proliferation or morphology. Sub-lethal and prolonged low doses of oxidative stress considerably accelerated telomere attrition. The effects of sub-lethal oxidative stress regarding proliferation and telomere biology were more distinct in senescent cells. Acute oxidant insult caused up-regulation of p21 expression to levels comparable to senescent cells. TRF2 protects telomere ends and showed elevated expression levels. SIRT1 and XRCC5 enable cells to cope with unfavorable growing conditions. Both were up-regulated after oxidant insult, but expression levels decreased in aging cells. Taken together, oxidative stress considerably accelerated telomere shortening and cellular aging in chondrocytes. Senescent cells showed a reduced tolerance to oxidative stress.
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Affiliation(s)
- Anita Brandl
- Department of Anesthesiology, University Hospital Regensburg, 93042 Regensburg, Germany.
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Cheng NH, Zhang W, Chen WQ, Jin J, Cui X, Butte NF, Chan L, Hirschi KD. A mammalian monothiol glutaredoxin, Grx3, is critical for cell cycle progression during embryogenesis. FEBS J 2011; 278:2525-2539. [PMID: 21575136 DOI: 10.1111/j.1742-4658.2011.08178.x] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Glutaredoxins (Grxs) have been shown to be critical in maintaining redox homeostasis in living cells. Recently, an emerging subgroup of Grxs with one cysteine residue in the putative active motif (monothiol Grxs) has been identified. However, the biological and physiological functions of this group of proteins have not been well characterized. Here, we characterize a mammalian monothiol Grx (Grx3, also termed TXNL2/PICOT) with high similarity to yeast ScGrx3/ScGrx4. In yeast expression assays, mammalian Grx3s were localized to the nuclei and able to rescue growth defects of grx3grx4 cells. Furthermore, Grx3 inhibited iron accumulation in yeast grx3gxr4 cells and suppressed the sensitivity of mutant cells to exogenous oxidants. In mice, Grx3 mRNA was ubiquitously expressed in developing embryos, adult tissues and organs, and was induced during oxidative stress. Mouse embryos absent of Grx3 grew smaller with morphological defects and eventually died at 12.5 days of gestation. Analysis in mouse embryonic fibroblasts revealed that Grx3(-/-) cells had impaired growth and cell cycle progression at the G(2) /M phase, whereas the DNA replication during the S phase was not affected by Grx3 deletion. Furthermore, Grx3-knockdown HeLa cells displayed a significant delay in mitotic exit and had a higher percentage of binucleated cells. Therefore, our findings suggest that the mammalian Grx3 has conserved functions in protecting cells against oxidative stress and deletion of Grx3 in mice causes early embryonic lethality which could be due to defective cell cycle progression during late mitosis.
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Affiliation(s)
- Ning-Hui Cheng
- United States Department of Agriculture / Agricultural Research Service Children's Nutrition Research Center, Baylor College of Medicine, Houston, TX, USA.,Department of Pediatrics, Baylor College of Medicine, Houston, TX, USA
| | - Wei Zhang
- Molecular Physiology and Biophysics, Baylor College of Medicine, Houston, TX, USA
| | - Wei-Qin Chen
- Molecular and Cellular Biology, Baylor College of Medicine, Houston, TX, USA
| | - Jianping Jin
- Department of Biochemistry and Molecular Biology, The University of Texas Health Science Center at Houston, Houston, TX, USA
| | - Xiaojiang Cui
- Department of Molecular Oncology, John Wayne Cancer Institute, Santa Monica, CA, USA
| | - Nancy F Butte
- United States Department of Agriculture / Agricultural Research Service Children's Nutrition Research Center, Baylor College of Medicine, Houston, TX, USA.,Department of Pediatrics, Baylor College of Medicine, Houston, TX, USA
| | - Lawrence Chan
- Molecular and Cellular Biology, Baylor College of Medicine, Houston, TX, USA
| | - Kendal D Hirschi
- United States Department of Agriculture / Agricultural Research Service Children's Nutrition Research Center, Baylor College of Medicine, Houston, TX, USA.,Department of Pediatrics, Baylor College of Medicine, Houston, TX, USA
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Anderson DD, Chubinskaya S, Guilak F, Martin JA, Oegema TR, Olson SA, Buckwalter JA. Post-traumatic osteoarthritis: improved understanding and opportunities for early intervention. J Orthop Res 2011; 29:802-9. [PMID: 21520254 PMCID: PMC3082940 DOI: 10.1002/jor.21359] [Citation(s) in RCA: 439] [Impact Index Per Article: 33.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/18/2010] [Accepted: 12/17/2010] [Indexed: 02/04/2023]
Abstract
Even with current treatments of acute joint injuries, more than 40% of people who suffer significant ligament or meniscus tears, or articular surface injuries, will develop osteoarthritis (OA). Correspondingly, 12% or more of all patients with lower extremity OA have a history of joint injury. Recent research suggests that acute joint damage that occurs at the time of an injury initiates a sequence of events that can lead to progressive articular surface damage. New molecular interventions, combined with evolving surgical methods, aim to minimize or prevent progressive tissue damage triggered by joint injury. Seizing the potential for progress in the treatment of joint injuries to forestall OA will depend on advances in (1) quantitative methods of assessing the injury severity, including both structural damage and biologic responses, (2) understanding of the pathogenesis of post-traumatic OA, taking into account potential interactions among the different tissues and the role of post-traumatic incongruity and instability, and (3) application of engineering and molecular research to develop new methods of treating injured joints. This paper highlights recent advances in understanding of the structural damage and the acute biological response following joint injury, and it identifies important directions for future research.
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Affiliation(s)
- Donald D. Anderson
- Department of Orthopaedics & Rehabilitation, The University of Iowa, Iowa City, IA, Department of Biomedical Engineering, The University of Iowa, Iowa City, IA
| | - Susan Chubinskaya
- Departments of Biochemistry, Orthopedic Surgery and Internal Medicine (Section of Rheumatology), Rush University Medical Center, Chicago, IL
| | - Farshid Guilak
- Department of Orthopaedic Surgery, Duke University Medical Center, Durham, NC
| | - James A. Martin
- Department of Orthopaedics & Rehabilitation, The University of Iowa, Iowa City, IA, Department of Biomedical Engineering, The University of Iowa, Iowa City, IA
| | - Theodore R. Oegema
- Departments of Biochemistry, Orthopedic Surgery and Internal Medicine (Section of Rheumatology), Rush University Medical Center, Chicago, IL
| | - Steven A. Olson
- Department of Orthopaedic Surgery, Duke University Medical Center, Durham, NC
| | - Joseph A. Buckwalter
- Department of Orthopaedics & Rehabilitation, The University of Iowa, Iowa City, IA, Veterans Affairs Medical Center, Iowa City, IA
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Anderson DD, Marsh JL, Brown TD. The pathomechanical etiology of post-traumatic osteoarthritis following intraarticular fractures. THE IOWA ORTHOPAEDIC JOURNAL 2011; 31:1-20. [PMID: 22096414 PMCID: PMC3215107] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Many intra-articular fracture patients eventually experience significant functional deficits, pain, and stiffness from post-traumatic osteoarthritis (PTOA). Over the last several decades, continued refinement of surgical reconstruction techniques has failed to markedly improve patient outcomes. New treatment paradigms are needed - ideally, bio/pharmaceutical. Progress in that direction has been impeded because the pathomechanical etiology of PTOA development is poorly understood. In particular, the relative roles and pathomechanisms of acute joint injury (from the initial trauma) versus chronic contact stress elevation (from residual incongruity) are unknown, primarily because there have been no objective methods for reliably quantifying either of these insult entities. Over the past decade, novel enabling technologies have been developed that provide objective biomechanical indices of injury severity and of chronic contact stress challenge to fractured joint surfaces. The severity of the initial joint injury is indexed primarily on the basis of the energy released in fracture, obtained from validated digital image analysis of CT scans. Chronic contact stress elevations are indexed by patient-specific finite element stress analysis, using models derived from post-reduction CT scans. These new measures, conceived in the laboratory, have been taken through the stage of validation, and then have been applied in studies of intra-articular fracture patients, to relate these biomechanical indices of cartilage insult to the incidence and severity of PTOA This body of work has provided a novel framework for developing and testing new approaches to forestall PTOA following intra-articular fractures.
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Affiliation(s)
- Donald D Anderson
- Department of Orthopaedics, The University of Iowa, Iowa City, IA, USA.
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