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Sundar S, Koopman A, Manzoni TJ, Xie W, Bhatti QUA, Lo CY, Damani VS, Yang AN, Pochan D, Parreno J, Engiles JB, Kayser LV, Dhong C. Kinetics and Retention of Polystyrenesulfonate for Proteoglycan Replacement in Cartilage. Biomacromolecules 2024; 25:5819-5833. [PMID: 39142342 PMCID: PMC11389691 DOI: 10.1021/acs.biomac.4c00479] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/16/2024]
Abstract
Tissue hydration provides articular cartilage with dynamic viscoelastic properties. Early stage osteoarthritis (OA) is marked by loss of proteoglycans and glycosaminoglycans (GAG), lowering fixed charge density, and impairing tissue osmotic function. The most common GAG replacement, chondroitin sulfate (CS), has failed to show effectiveness. Here, we investigated a synthetic polyelectrolyte, poly(styrenesulfonate) (PSS), both as a model compound to investigate polyelectrolyte transport in cartilage, and as a potential candidate to restore bulk fixed charge density in cartilage with GAG loss. Through bovine explants and histology, we determined zonal-based effective diffusion coefficients for three different molecular weights of PSS. Compared to CS, PSS was retained longer in GAG-depleted cartilage in static and compression-based desorption experiments. We explained enhanced solute performance of PSS by its more compact morphology and higher charge density by small-angle X-ray scattering. This study may improve design of GAG mimetic molecules for repairing osmotic function in OA cartilage.
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Affiliation(s)
- Shalini Sundar
- Department of Biomedical Engineering, University of Delaware, Newark 19716, Delaware, United States
| | - Allison Koopman
- Department of Materials Science and Engineering, University of Delaware, Newark 19716, Delaware, United States
| | - Thomas J Manzoni
- Department of Biological Sciences, University of Delaware, Newark 19716, Delaware, United States
| | - Weiran Xie
- Department of Materials Science and Engineering, University of Delaware, Newark 19716, Delaware, United States
| | - Qurat-Ul-Ain Bhatti
- Department of Materials Science and Engineering, University of Delaware, Newark 19716, Delaware, United States
| | - Chun-Yuan Lo
- Department of Chemistry and Biochemistry, University of Delaware, Newark 19716, Delaware, United States
| | - Vidhika S Damani
- Department of Materials Science and Engineering, University of Delaware, Newark 19716, Delaware, United States
| | - Ai Nin Yang
- Department of Chemistry and Biochemistry, University of Delaware, Newark 19716, Delaware, United States
| | - Darrin Pochan
- Department of Materials Science and Engineering, University of Delaware, Newark 19716, Delaware, United States
| | - Justin Parreno
- Department of Biomedical Engineering, University of Delaware, Newark 19716, Delaware, United States
- Department of Biological Sciences, University of Delaware, Newark 19716, Delaware, United States
| | - Julie B Engiles
- Department of Clinical Studies, University of Pennsylvania School of Veterinary Medicine, Kennett Square 19348, Pennsylvania, United States
- Department of Pathobiology, University of Pennsylvania School of Veterinary Medicine, Kennett Square, Pennsylvania 19348, United States
| | - Laure V Kayser
- Department of Materials Science and Engineering, University of Delaware, Newark 19716, Delaware, United States
- Department of Chemistry and Biochemistry, University of Delaware, Newark 19716, Delaware, United States
| | - Charles Dhong
- Department of Biomedical Engineering, University of Delaware, Newark 19716, Delaware, United States
- Department of Materials Science and Engineering, University of Delaware, Newark 19716, Delaware, United States
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Ansari M, Darvishi A, Sabzevari A. A review of advanced hydrogels for cartilage tissue engineering. Front Bioeng Biotechnol 2024; 12:1340893. [PMID: 38390359 PMCID: PMC10881834 DOI: 10.3389/fbioe.2024.1340893] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2023] [Accepted: 01/29/2024] [Indexed: 02/24/2024] Open
Abstract
With the increase in weight and age of the population, the consumption of tobacco, inappropriate foods, and the reduction of sports activities in recent years, bone and joint diseases such as osteoarthritis (OA) have become more common in the world. From the past until now, various treatment strategies (e.g., microfracture treatment, Autologous Chondrocyte Implantation (ACI), and Mosaicplasty) have been investigated and studied for the prevention and treatment of this disease. However, these methods face problems such as being invasive, not fully repairing the tissue, and damaging the surrounding tissues. Tissue engineering, including cartilage tissue engineering, is one of the minimally invasive, innovative, and effective methods for the treatment and regeneration of damaged cartilage, which has attracted the attention of scientists in the fields of medicine and biomaterials engineering in the past several years. Hydrogels of different types with diverse properties have become desirable candidates for engineering and treating cartilage tissue. They can cover most of the shortcomings of other treatment methods and cause the least secondary damage to the patient. Besides using hydrogels as an ideal strategy, new drug delivery and treatment methods, such as targeted drug delivery and treatment through mechanical signaling, have been studied as interesting strategies. In this study, we review and discuss various types of hydrogels, biomaterials used for hydrogel manufacturing, cartilage-targeting drug delivery, and mechanosignaling as modern strategies for cartilage treatment.
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Affiliation(s)
- Mojtaba Ansari
- Department of Biomedical Engineering, Meybod University, Meybod, Iran
| | - Ahmad Darvishi
- Department of Biomedical Engineering, Meybod University, Meybod, Iran
| | - Alireza Sabzevari
- Department of Biomedical Engineering, Meybod University, Meybod, Iran
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D'Andrea CR, Alfraihat A, Singh A, Anari JB, Cahill PJ, Schaer T, Snyder BD, Elliott D, Balasubramanian S. Part 2. Review and meta-analysis of studies on modulation of longitudinal bone growth and growth plate activity: A micro-scale perspective. J Orthop Res 2021; 39:919-928. [PMID: 33458882 DOI: 10.1002/jor.24992] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/30/2020] [Revised: 12/24/2020] [Accepted: 01/11/2021] [Indexed: 02/04/2023]
Abstract
Macro-scale changes in longitudinal bone growth resulting from mechanical loading were shown in Part 1 of this review to depend on load magnitude, anatomical location, and species. While no significant effect on longitudinal growth was observed by varying frequency and amplitude of cyclic loading, such variations, in addition to loading duration and species, were shown to affect the morphology, viability, and gene and protein expression within the growth plate. Intermittent compression regimens were shown to preserve or increase growth plate height while stimulating increased chondrocyte presence in the hypertrophic zone relative to persistent and static loading regimens. Gene and protein expressions related to matrix synthesis and degradation, as well as regulation of chondrocyte apoptosis were shown to exhibit magnitude-, frequency-, and duration-dependent responses to loading regimen. Chondrocyte viability was shown to be largely preserved within physiological bounds of magnitude, frequency, amplitude, and duration. Persistent static loading was shown to be associated with overall growth plate height in tension only, reducing it in compression, while affecting growth plate zone heights differently across species and encouraging mineralization relative to intermittent cyclic loading. Lateral loading of the growth plate, as well as microfluidic approaches are relatively understudied, and age, anatomical location, and species effects within these approaches are undefined. Understanding the micro-scale effects of varied loading regimes can assist in the development of growth modulation methods and device designs optimized for growth plate viability preservation or mineralization stimulation based on patient age and anatomical location.
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Affiliation(s)
- Christian R D'Andrea
- School of Biomedical Engineering, Science and Health Systems, Drexel University, Philadelphia, Pennsylvania, USA
| | - Ausilah Alfraihat
- School of Biomedical Engineering, Science and Health Systems, Drexel University, Philadelphia, Pennsylvania, USA
| | - Anita Singh
- Department of Biomedical Engineering, Widener University, Chester, Pennsylvania, USA
| | - Jason B Anari
- Division of Orthopedics, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
| | - Patrick J Cahill
- Division of Orthopedics, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
| | - Thomas Schaer
- Department of Clinical Studies New Bolton Center, School of Veterinary Medicine, University of Pennsylvania, Kennett Square, Pennsylvania, USA
| | - Brian D Snyder
- Center for Advanced Orthopedic Studies, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, USA
| | - Dawn Elliott
- Department of Biomedical Engineering, University of Delaware, Newark, Delaware, USA
| | - Sriram Balasubramanian
- School of Biomedical Engineering, Science and Health Systems, Drexel University, Philadelphia, Pennsylvania, USA
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Knee Joint Loading in Healthy Adults During Functional Exercises: Implications for Rehabilitation Guidelines. J Orthop Sports Phys Ther 2018; 48:162-173. [PMID: 29308697 DOI: 10.2519/jospt.2018.7459] [Citation(s) in RCA: 59] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Study Design Controlled laboratory study. Background The inclusion of specific exercises in rehabilitation after knee injury is currently expert based, as a thorough description of the knee contact forces during different exercises is lacking. Objective To quantify knee loading during frequently used activities such as squats, lunges, single-leg hops, walking stairs, standing up, and gait, and to grade knee joint loading during these activities. Methods Three-dimensional motion-analysis data of 15 healthy adults were acquired during 9 standardized activities used in rehabilitation. Experimental motion data were processed using musculoskeletal modeling to calculate contact and shear forces on the different knee compartments (tibiofemoral and patellofemoral). Using repeated-measures analyses of variance, contact and shear forces were compared between compartments and exercises, whereas muscle and average maximum femoral forces were compared only between exercises. Results With the exception of squats, all therapeutic exercises imposed higher forces to the tibiofemoral joint compared to gait. Likewise, patellofemoral forces were greater during all exercises when compared to gait. Greater compartmental contact forces were accompanied by greater compartmental shear forces. Furthermore, force distribution over the medial and lateral compartments varied between exercises. With increased knee flexion, more force was imposed on the posterior portion of the condyles. Conclusion These results suggest that with careful selection of exercises, forces on an injured zone of the joint can be reduced, as the force distribution differs strongly between exercises. Based on the results, a graded exercise program for progressive knee joint loading during rehabilitation can be conceptualized. J Orthop Sports Phys Ther 2018;48(3):162-173. Epub 6 Jan 2018. doi:10.2519/jospt.2018.7459.
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Liu M, Zeng X, Ma C, Yi H, Ali Z, Mou X, Li S, Deng Y, He N. Injectable hydrogels for cartilage and bone tissue engineering. Bone Res 2017; 5:17014. [PMID: 28584674 PMCID: PMC5448314 DOI: 10.1038/boneres.2017.14] [Citation(s) in RCA: 654] [Impact Index Per Article: 93.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2016] [Revised: 01/08/2017] [Accepted: 01/10/2017] [Indexed: 12/17/2022] Open
Abstract
Tissue engineering has become a promising strategy for repairing damaged cartilage and bone tissue. Among the scaffolds for tissue-engineering applications, injectable hydrogels have demonstrated great potential for use as three-dimensional cell culture scaffolds in cartilage and bone tissue engineering, owing to their high water content, similarity to the natural extracellular matrix (ECM), porous framework for cell transplantation and proliferation, minimal invasive properties, and ability to match irregular defects. In this review, we describe the selection of appropriate biomaterials and fabrication methods to prepare novel injectable hydrogels for cartilage and bone tissue engineering. In addition, the biology of cartilage and the bony ECM is also summarized. Finally, future perspectives for injectable hydrogels in cartilage and bone tissue engineering are discussed.
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Affiliation(s)
- Mei Liu
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing, PR China
| | - Xin Zeng
- Nanjing Maternity and Child Health Care Hospital, Nanjing, PR China
| | - Chao Ma
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing, PR China
| | - Huan Yi
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing, PR China
| | - Zeeshan Ali
- School of Applied Chemistry and Biotechnology, Shenzhen Polytechnic, Shenzhen, PR China
- School of Chemistry and Chemical Engineering, Southeast University, Nanjing, PR China
| | - Xianbo Mou
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing, PR China
| | - Song Li
- Hunan Key Laboratory of Green Chemistry and Application of Biological Nanotechnology, Hunan University of Technology, Zhuzhou, PR China
| | - Yan Deng
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing, PR China
- Hunan Key Laboratory of Green Chemistry and Application of Biological Nanotechnology, Hunan University of Technology, Zhuzhou, PR China
| | - Nongyue He
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing, PR China
- Hunan Key Laboratory of Green Chemistry and Application of Biological Nanotechnology, Hunan University of Technology, Zhuzhou, PR China
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Van Rossom S, Smith CR, Zevenbergen L, Thelen DG, Vanwanseele B, Van Assche D, Jonkers I. Knee Cartilage Thickness, T1ρ and T2 Relaxation Time Are Related to Articular Cartilage Loading in Healthy Adults. PLoS One 2017; 12:e0170002. [PMID: 28076431 PMCID: PMC5226797 DOI: 10.1371/journal.pone.0170002] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2016] [Accepted: 12/27/2016] [Indexed: 11/19/2022] Open
Abstract
Cartilage is responsive to the loading imposed during cyclic routine activities. However, the local relation between cartilage in terms of thickness distribution and biochemical composition and the local contact pressure during walking has not been established. The objective of this study was to evaluate the relation between cartilage thickness, proteoglycan and collagen concentration in the knee joint and knee loading in terms of contact forces and pressure during walking. 3D gait analysis and MRI (3D-FSE, T1ρ relaxation time and T2 relaxation time sequence) of fifteen healthy subjects were acquired. Experimental gait data was processed using musculoskeletal modeling to calculate the contact forces, impulses and pressure distribution in the tibiofemoral joint. Correlates to local cartilage thickness and mean T1ρ and T2 relaxation times of the weight-bearing area of the femoral condyles were examined. Local thickness was significantly correlated with local pressure: medial thickness was correlated with medial condyle contact pressure and contact force, and lateral condyle thickness was correlated with lateral condyle contact pressure and contact force during stance. Furthermore, average T1ρ and T2 relaxation time correlated significantly with the peak contact forces and impulses. Increased T1ρ relaxation time correlated with increased shear loading, decreased T1ρ and T2 relaxation time correlated with increased compressive forces and pressures. Thicker cartilage was correlated with higher condylar loading during walking, suggesting that cartilage thickness is increased in those areas experiencing higher loading during a cyclic activity such as gait. Furthermore, the proteoglycan and collagen concentration and orientation derived from T1ρ and T2 relaxation measures were related to loading.
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Affiliation(s)
- Sam Van Rossom
- Human movement biomechanics research group, Department of kinesiology, Katholieke Universiteit Leuven, Leuven, Belgium
| | - Colin Robert Smith
- Department of mechanical engineering, University of Wisconsin-Madison, Madison, United States of America
| | - Lianne Zevenbergen
- Human movement biomechanics research group, Department of kinesiology, Katholieke Universiteit Leuven, Leuven, Belgium
| | - Darryl Gerard Thelen
- Department of mechanical engineering, University of Wisconsin-Madison, Madison, United States of America
- Department of biomedical engineering, University of Wisconsin-Madison, Madison, United States of America
- Department of orthopedics and rehabilitation, University of Wisconsin-Madison, Madison, United States of America
| | - Benedicte Vanwanseele
- Human movement biomechanics research group, Department of kinesiology, Katholieke Universiteit Leuven, Leuven, Belgium
| | - Dieter Van Assche
- Musculoskeletal rehabilitation research group, Department of rehabilitation sciences, Katholieke Universiteit Leuven, Leuven, Belgium
| | - Ilse Jonkers
- Human movement biomechanics research group, Department of kinesiology, Katholieke Universiteit Leuven, Leuven, Belgium
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Li Y, Frank EH, Wang Y, Chubinskaya S, Huang HH, Grodzinsky AJ. Moderate dynamic compression inhibits pro-catabolic response of cartilage to mechanical injury, tumor necrosis factor-α and interleukin-6, but accentuates degradation above a strain threshold. Osteoarthritis Cartilage 2013; 21:1933-41. [PMID: 24007885 PMCID: PMC3855909 DOI: 10.1016/j.joca.2013.08.021] [Citation(s) in RCA: 76] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/18/2012] [Revised: 08/18/2013] [Accepted: 08/26/2013] [Indexed: 02/02/2023]
Abstract
OBJECTIVE Traumatic joint injury can initiate early cartilage degeneration in the presence of elevated inflammatory cytokines (e.g., tumor necrosis factor (TNF)-α and interleukin (IL)-6). The positive/negative effects of post-injury dynamic loading on cartilage degradation and repair in vivo are not well-understood. This study examined the effects of dynamic strain on immature bovine cartilage in vitro challenged with TNF-α + IL-6 and its soluble receptor (sIL-6R) with/without initial mechanical injury. METHODS Groups of mechanically injured or non-injured explants were cultured in TNF-α + IL-6/sIL-6R for 8 days. Intermittent dynamic compression was applied concurrently at 10%, 20%, or 30% strain amplitude. Outcome measures included sulfated glycosaminoglycan (sGAG) loss (dimethylmethylene blue (DMMB)), aggrecan biosynthesis ((35)S-incorporation), aggrecanase activity (Western blot), chondrocyte viability (fluorescence staining) and apoptosis (nuclear blebbing via light microscopy), and gene expression (qPCR). RESULTS In bovine explants, cytokine alone and injury-plus-cytokine treatments markedly increased sGAG loss and aggrecanase activity, and induced chondrocyte apoptosis. These effects were abolished by moderate 10% and 20% strains. However, 30% strain amplitude greatly increased apoptosis and had no inhibitory effect on aggrecanase activity. TNF + IL-6/sIL-6R downregulated matrix gene expression and upregulated expression of inflammatory genes, effects that were rescued by moderate dynamic strains but not by 30% strain. CONCLUSIONS Moderate dynamic compression inhibits the pro-catabolic response of cartilage to mechanical injury and cytokine challenge, but there is a threshold strain amplitude above which loading becomes detrimental to cartilage. Our findings support the concept of appropriate loading for post-injury rehabilitation.
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Affiliation(s)
- Yang Li
- Massachusetts Institute of Technology, Cambridge, MA
| | | | - Yang Wang
- Massachusetts Institute of Technology, Cambridge, MA
| | | | - Han-Hwa Huang
- Massachusetts Institute of Technology, Cambridge, MA
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Biomechanical influence of cartilage homeostasis in health and disease. ARTHRITIS 2011; 2011:979032. [PMID: 22046527 PMCID: PMC3196252 DOI: 10.1155/2011/979032] [Citation(s) in RCA: 86] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/01/2011] [Accepted: 06/26/2011] [Indexed: 11/30/2022]
Abstract
There is an urgent demand for long term solutions to improve osteoarthritis treatments in the ageing population. There are drugs that control the pain but none that stop the progression of the disease in a safe and efficient way. Increased intervention efforts, augmented by early diagnosis and integrated biophysical therapies are therefore needed. Unfortunately, progress has been hampered due to the wide variety of experimental models which examine the effect of mechanical stimuli and inflammatory mediators on signal transduction pathways. Our understanding of the early mechanopathophysiology is poor, particularly the way in which mechanical stimuli influences cell function and regulates matrix synthesis. This makes it difficult to identify reliable targets and design new therapies. In addition, the effect of mechanical loading on matrix turnover is dependent on the nature of the mechanical stimulus. Accumulating evidence suggests that moderate mechanical loading helps to maintain cartilage integrity with a low turnover of matrix constituents. In contrast, nonphysiological mechanical signals are associated with increased cartilage damage and degenerative changes. This review will discuss the pathways regulated by compressive loading regimes and inflammatory signals in animal and in vitro 3D models. Identification of the chondroprotective pathways will reveal novel targets for osteoarthritis treatments.
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Torzilli PA, Bhargava M, Park S, Chen CC. Mechanical load inhibits IL-1 induced matrix degradation in articular cartilage. Osteoarthritis Cartilage 2010; 18:97-105. [PMID: 19747586 PMCID: PMC2818235 DOI: 10.1016/j.joca.2009.07.012] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/20/2009] [Revised: 07/17/2009] [Accepted: 06/22/2009] [Indexed: 02/02/2023]
Abstract
OBJECTIVE Osteoarthritis is a disease process of cellular degradation of articular cartilage caused by mechanical loads and inflammatory cytokines. We studied the cellular response in native cartilage subjected to a mechanical load administered simultaneously with an inflammatory cytokine interleukin-1 (IL-1), hypothesizing that the combination of load and cytokine would result in accelerated extracellular matrix (ECM) degradation. METHODS Mature bovine articular cartilage was loaded for 3 days (stimulation) with 0.2 and 0.5 MPa stresses, with and without IL-1 (IL-1alpha, 10 ng/ml), followed by 3 days of no stimulation (recovery). Aggrecan and collagen loss were measured as well as aggrecan cleavage using monoclonal antibodies AF-28 and BC-3 for cleavage by aggrecanases (ADAMTS) and matrix metalloproteinases (MMPs), respectively. RESULTS Incubation with IL-1 caused aggrecan cleavage by aggrecanases and MMPs during the 3 days of stimulation. A load of 0.5 MPa inhibited the IL-1-induced aggrecan loss while no inhibition was found for the 0.2 MPa stress. There was no collagen loss during the treatments but upon load and IL-1 removal proteoglycan and collagen loss increased. Load itself under these conditions was found to have no effect when compared to the unloaded controls. CONCLUSIONS A mechanical load of sufficient magnitude can inhibit ECM degradation by chondrocytes when stimulated by IL-1. The molecular mechanisms involved in this process are not clear but probably involve altered mechanochemical signal transduction between the ECM and chondrocyte.
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Affiliation(s)
| | | | - Seonghun Park
- School of Mechanical Engineering Pusan National University Busan, Republic of Korea (South Korea)
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Sauerland K, Steinmeyer J. Intermittent mechanical loading of articular cartilage explants modulates chondroitin sulfate fine structure. Osteoarthritis Cartilage 2007; 15:1403-9. [PMID: 17574451 DOI: 10.1016/j.joca.2007.05.004] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/01/2006] [Accepted: 05/01/2007] [Indexed: 02/02/2023]
Abstract
OBJECTIVE Alterations in the sulfation pattern of chondroitin sulfate (CS) chains of proteoglycans have been associated with aging and degeneration of articular cartilage. The purpose of the present study was to investigate systematically the effect of load amplitudes, frequencies and load durations of intermittently applied mechanical pressure on the sulfation of CS chains of cultured bovine articular cartilage explants. METHODS Using a sinusoidal waveform of 0.5 Hz frequency, cyclic compressive pressure of 0.1-1.0 MPa was applied for 10s followed by a period of unloading lasting 10-1000 s. These intermittent loading protocols were repeated for a total duration of 1-6 days. Newly synthesized as well as endogenous CS chains were isolated, depolymerized and subsequently quantitated after fractionation by high-performance anion-exchange chromatography. RESULTS Increasing the mechanical demands on cartilage explants by elevating either the duration or the frequency of loading can significantly alter the fine structure of newly synthesized CS in that less chains terminate on galNAc4,6S and, in that simultaneously the ratio of the internal disaccharides DeltaDi6S to DeltaDi4S is increased. Similar results were obtained with explants being slightly mechanically challenged by low magnitudes of loads. CONCLUSION Our data show for the first time that intermittent loading of articular cartilage explants can significantly alter the sulfation pattern of the terminal CS residues as well as of the internal disaccharides. Furthermore, our results indicate that explants possess a physiological window of stress in which they are able to produce also a normal extracellular matrix.
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Affiliation(s)
- K Sauerland
- Orthopaedic Research Laboratories, Department of Orthopaedic Surgery, University Clinics Giessen and Marburg GmbH, Paul-Meimberg-Strasse 3, 35385 Giessen, Germany
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Vincent TL, McLean CJ, Full LE, Peston D, Saklatvala J. FGF-2 is bound to perlecan in the pericellular matrix of articular cartilage, where it acts as a chondrocyte mechanotransducer. Osteoarthritis Cartilage 2007; 15:752-63. [PMID: 17368052 DOI: 10.1016/j.joca.2007.01.021] [Citation(s) in RCA: 167] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/13/2006] [Accepted: 01/28/2007] [Indexed: 02/02/2023]
Abstract
OBJECTIVE We have shown previously that cutting or loading articular cartilage resulted in a fibroblast growth factor-2 (FGF-2) dependent activation of the extracellularly regulated kinase (ERK), and induction of a number of chondrocyte regulatory proteins including tissue inhibitor of metalloproteinase-1 and matrix metalloproteinases 1 and 3. An extracellular matrix-bound pool of FGF-2 was apparent, which could be liberated from the tissue by heparitinase (Vincent et al., Proc Natl Acad Sci U S A 2002;99(12):8259-64, Vincent et al., Arthritis Rheum 2004 Feb;50(2):526-33). Our objectives were to determine where FGF-2 was stored in articular cartilage, to which proteoglycan it was bound, and to elucidate its role in chondrocyte mechanotransduction. METHODS Immunohistochemistry and confocal microscopy were used to localise FGF-2 in the tissue. In vitro binding studies were performed using IASYS surface plasmon resonance. To study the role of pericellular FGF-2 in mechanotransduction cartilage explants or articular chondrocytes encapsulated in alginate were loaded using an in house loading rig. The loading response was assessed by the activation of ERK, in the presence or absence of a specific FGFR inhibitor. RESULTS Here we have identified perlecan as the heparan sulphate proteoglycan that sequesters FGF-2 in articular cartilage. Perlecan and FGF-2 co-localised within the type VI collagen-rich pericellular matrix of porcine and human articular cartilage. Chondrocytes encapsulated in alginate were able to accumulate pericellular perlecan and FGF-2 in culture, and deliver an FGF-dependent activation of ERK when loaded. CONCLUSION Loading-induced ERK activation was dependent upon the presence and concentration of pericellular FGF-2, suggesting a functional role for this matrix-bound growth factor in chondrocyte mechanotransduction.
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Affiliation(s)
- T L Vincent
- The Kennedy Institute of Rheumatology, Faculty of Medicine, Imperial College School of Science, Technology, and Medicine, London, UK.
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12
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Wolf A, Ackermann B, Steinmeyer J. Collagen synthesis of articular cartilage explants in response to frequency of cyclic mechanical loading. Cell Tissue Res 2006; 327:155-66. [PMID: 16941123 DOI: 10.1007/s00441-006-0251-z] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2006] [Accepted: 05/18/2006] [Indexed: 10/24/2022]
Abstract
Articular cartilage in vivo experiences the effects of both cell-regulatory proteins and mechanical forces. This study has addressed the hypothesis that the frequency of intermittently or continuously applied mechanical loads is a critical parameter in the regulation of chondrocyte collagen biosynthesis. Cyclic compressive pressure was applied intermittently to bovine articular cartilage explants by using a sinusoidal waveform of 0.1-1.0 Hz frequency with a peak stress of 0.5 MPa for a period of 5-20 s followed by a load-free period of 10-1,000 s. These loading protocols were repeated for a total duration of 6 days. In separate experiments, cyclic loading was continuously applied by using a sinusoidal waveform of 0.001-0.5 Hz frequency and a peak stress of 1.0 MPa for a period of 3 days. Unloaded cartilage discs of the same condyle were cultured in identically constructed loading chambers and served as controls. We report quantitative data showing that (1) no correlation exists between the relative rate of collagen synthesis expressed as the proportion of newly synthesized collagen among newly made proteins and either the frequency of intermittently or continuously applied loads or the overall time cartilage is actively loaded, and (2) individual protocols of intermittently applied loads can reduce the relative rate of collagen synthesis and increase the water content, whereas (3) continuously applied cyclic loads always suppress the relative rate of collagen synthesis compared with that of unloaded control specimens. The results provide further experimental evidence that collagen metabolism is difficult to manipulate by mechanical stimuli. This is physiologically important for the maintainance of the material properties of collagen in view of the heavy mechanical demands made upon it. Moreover, the unaltered or reduced collagen synthesis of cartilage explants might reflect more closely the metabolism of normal or early human osteoarthritic cartilage.
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Affiliation(s)
- Amela Wolf
- Orthopaedic Research Laboratories, Department of Orthopaedic Surgery, University Clinics Giessen and Marburg, Paul-Meimberg-Strasse 3, 35385 Giessen, Germany
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