1
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Du C, Chen Z, Liu S, Liu J, Zhan J, Zou J, Liao J, Huang W, Lei Y. Lubricin-Inspired Nanozymes Reconstruct Cartilage Lubrication System with an "In-Out" Strategy. SMALL METHODS 2024:e2400757. [PMID: 38962862 DOI: 10.1002/smtd.202400757] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2024] [Revised: 06/25/2024] [Indexed: 07/05/2024]
Abstract
Lubricin, secreted primarily by chondrocytes, plays a critical role in maintaining the function of the cartilage lubrication system. However, both external factors such as friction and internal factors like oxidative stress can disrupt this system, leading to osteoarthritis. Inspired by lubricin, a lubricating nanozyme, that is, Poly-2-acrylamide-2-methylpropanesulfonic acid sodium salt-grafted aminofullerene, is developed to restore the cartilage lubrication system using an "In-Out" strategy. The "Out" aspect involves reducing friction through a combination of hydration lubrication and ball-bearing lubrication. Simultaneously, the "In" aspect aims to mitigate oxidative stress by reducing free radical, increasing autophagy, and improving the mitochondrial respiratory chain. This results in reduced chondrocyte senescence and increased lubricin production, enhancing the natural lubrication ability of cartilage. Transcriptome sequencing and Western blot results demonstrate that it enhances the functionality of mitochondrial respiratory chain complexes I, III, and V, thereby improving mitochondrial function in chondrocytes. In vitro and in vivo experiments show that the lubricating nanozymes reduce cartilage wear, improve chondrocyte senescence, and mitigate oxidative stress damage, thereby mitigating the progression of osteoarthritis. These findings provide novel insights into treating diseases associated with oxidative stress and frictional damage, such as osteoarthritis, and set the stage for future research and development of therapeutic interventions.
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Affiliation(s)
- Chengcheng Du
- Department of Orthopedics, Orthopedic Laboratory of Chongqing Medical University, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, China
| | - Zhuolin Chen
- Department of Orthopedics, Orthopedic Laboratory of Chongqing Medical University, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, China
| | - Senrui Liu
- Department of Orthopedics, Orthopedic Laboratory of Chongqing Medical University, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, China
| | - Jiacheng Liu
- Department of Orthopedics, Orthopedic Laboratory of Chongqing Medical University, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, China
| | - Jingdi Zhan
- Department of Orthopedics, Orthopedic Laboratory of Chongqing Medical University, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, China
| | - Jing Zou
- Department of Orthopedics, Orthopedic Laboratory of Chongqing Medical University, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, China
| | - Junyi Liao
- Department of Orthopedics, Orthopedic Laboratory of Chongqing Medical University, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, China
| | - Wei Huang
- Department of Orthopedics, Orthopedic Laboratory of Chongqing Medical University, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, China
| | - Yiting Lei
- Department of Orthopedics, Orthopedic Laboratory of Chongqing Medical University, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, China
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2
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Li S, Yang J. Double-crosslinked self-healing hydrogel alleviates osteoarthritis by protecting from wearing and targeting NF-kB signaling. JOURNAL OF BIOMATERIALS SCIENCE. POLYMER EDITION 2024:1-13. [PMID: 38860745 DOI: 10.1080/09205063.2024.2360759] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/16/2024] [Accepted: 05/20/2024] [Indexed: 06/12/2024]
Abstract
Osteoarthritis (OA) is a chronic disease that causes pain, morbidity, and disability. The main strategy for OA treatment focuses on inflammation suppression, inhibition of osteoclastogenesis, and protection of articular cartilage. These functions cannot be performed effectively by monotherapy. Therefore, an effective drug delivery system is required, capable of containing and controlling the efflux of various drugs to alleviate osteoclastogenesis, protect cartilage and subchondral bone, and suppress inflammation. In this work, an encapsulation system is constructed using a self-healing chitosan hydrogel and allocated compound drugs. The self-healing gel is composed of branched-functionalized chitosan, created by simultaneously using polycaprolactone polyethylene glycol azide as a block polymer and the host-guest assembly of β-cyclodextrin and adamantane. Inhibitors of the NFkB pathway are loaded into the cavities of β-cyclodextrin and the spring-like structure of the block polymer, which can be rapidly released upon joint friction (due to the reassembly of β-cyclodextrin and adamantane by shear stress and the stretch of the block polymer). In vitro experiments using BMMs and the ATDC5 cell line confirm that the developed hydrogel can simultaneously suppress osteoclastogenesis and induce chondrogenesis. Additionally, a model of knee arthritis in C57 mice was used to confirm that this double-crosslinked encapsulation system can lubricate the knee joint surface and provide adequate protection on demand through shear-responsive drug release.
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Affiliation(s)
- Shengyun Li
- Department of Orthopaedic Surgery, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, China
- Key Laboratory of Musculoskeletal System Degeneration and Regeneration, Translational Research of Zhejiang Province, Hangzhou, China
| | - Jie Yang
- Department of Orthopaedic Surgery, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, China
- Key Laboratory of Musculoskeletal System Degeneration and Regeneration, Translational Research of Zhejiang Province, Hangzhou, China
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3
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Bordon G, Ramakrishna SN, Edalat SG, Eugster R, Arcifa A, Vermathen M, Aleandri S, Bertoncelj MF, Furrer J, Vermathen P, Isa L, Crockett R, Distler O, Luciani P. Liposomal aggregates sustain the release of rapamycin and protect cartilage from friction. J Colloid Interface Sci 2023; 650:1659-1670. [PMID: 37494862 DOI: 10.1016/j.jcis.2023.07.087] [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: 03/30/2023] [Revised: 07/07/2023] [Accepted: 07/13/2023] [Indexed: 07/28/2023]
Abstract
Liposomes show promise as biolubricants for damaged cartilage, but their small size results in low joint and cartilage retention. We developed a zinc ion-based liposomal drug delivery system for local osteoarthritis therapy, focusing on sustained release and tribological protection from phospholipid lubrication properties. Our strategy involved inducing aggregation of negatively charged liposomes with zinc ions to extend rapamycin (RAPA) release and improve cartilage lubrication. Liposomal aggregation occurred within 10 min and was irreversible, facilitating excess cation removal. The aggregates extended RAPA release beyond free liposomes and displayed irregular morphology influenced by RAPA. At nearly 100 µm, the aggregates were large enough to exceed the previously reported size threshold for increased joint retention. Tribological assessment on silicon surfaces and ex vivo porcine cartilage revealed the system's excellent protective ability against friction at both nano- and macro-scales. Moreover, RAPA was shown to attenuate the fibrotic response in human OA synovial fibroblasts. Our findings suggest the zinc ion-based liposomal drug delivery system has potential to enhance OA therapy through extended release and cartilage tribological protection, while also illustrating the impact of a hydrophobic drug like RAPA on liposome aggregation and morphology.
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Affiliation(s)
- Gregor Bordon
- Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, Freiestrasse 3, 3012 Bern, Switzerland
| | - Shivaprakash N Ramakrishna
- Laboratory for Soft Materials and Interfaces, Department of Materials, ETH Zurich, Vladimir- Prelog-Weg 1-5/10, 8093 Zurich, Switzerland
| | - Sam G Edalat
- Center of Experimental Rheumatology, Department of Rheumatology, University Hospital Zurich, University of Zurich, Wagistrasse 14, 8952 Schlieren, Switzerland
| | - Remo Eugster
- Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, Freiestrasse 3, 3012 Bern, Switzerland
| | - Andrea Arcifa
- Laboratory for Surface Science and Coating Technologies, EMPA, Uberlandstrasse 129, 8600 Dubendorf, Switzerland
| | - Martina Vermathen
- Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, Freiestrasse 3, 3012 Bern, Switzerland
| | - Simone Aleandri
- Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, Freiestrasse 3, 3012 Bern, Switzerland
| | | | - Julien Furrer
- Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, Freiestrasse 3, 3012 Bern, Switzerland
| | - Peter Vermathen
- Magnetic Resonance Methodology, Institute of Diagnostic and Interventional Neuroradiology, University & Inselspital Bern, sitem-insel AG, Freiburgstrasse 3, 3010 Bern, Switzerland
| | - Lucio Isa
- Laboratory for Soft Materials and Interfaces, Department of Materials, ETH Zurich, Vladimir- Prelog-Weg 1-5/10, 8093 Zurich, Switzerland
| | - Rowena Crockett
- Laboratory for Surface Science and Coating Technologies, EMPA, Uberlandstrasse 129, 8600 Dubendorf, Switzerland
| | - Oliver Distler
- Center of Experimental Rheumatology, Department of Rheumatology, University Hospital Zurich, University of Zurich, Wagistrasse 14, 8952 Schlieren, Switzerland
| | - Paola Luciani
- Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, Freiestrasse 3, 3012 Bern, Switzerland.
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4
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Aldrich JL, Panicker A, Ovalle R, Sharma B. Drug Delivery Strategies and Nanozyme Technologies to Overcome Limitations for Targeting Oxidative Stress in Osteoarthritis. Pharmaceuticals (Basel) 2023; 16:1044. [PMID: 37513955 PMCID: PMC10383173 DOI: 10.3390/ph16071044] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2023] [Revised: 06/26/2023] [Accepted: 07/12/2023] [Indexed: 07/30/2023] Open
Abstract
Oxidative stress is an important, but elusive, therapeutic target for osteoarthritis (OA). Antioxidant strategies that target oxidative stress through the elimination of reactive oxygen species (ROS) have been widely evaluated for OA but are limited by the physiological characteristics of the joint. Current hallmarks in antioxidant treatment strategies include poor bioavailability, poor stability, and poor retention in the joint. For example, oral intake of exogenous antioxidants has limited access to the joint space, and intra-articular injections require frequent dosing to provide therapeutic effects. Advancements in ROS-scavenging nanomaterials, also known as nanozymes, leverage bioactive material properties to improve delivery and retention. Material properties of nanozymes can be tuned to overcome physiological barriers in the knee. However, the clinical application of these nanozymes is still limited, and studies to understand their utility in treating OA are still in their infancy. The objective of this review is to evaluate current antioxidant treatment strategies and the development of nanozymes as a potential alternative to conventional small molecules and enzymes.
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Affiliation(s)
| | | | | | - Blanka Sharma
- J. Crayton Pruitt Family Department of Biomedical Engineering, University of Florida, Gainesville, FL 32611, USA; (J.L.A.)
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5
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Recent advances in superlubricity of liposomes for biomedical applications. Colloids Surf B Biointerfaces 2022; 218:112764. [PMID: 35973238 DOI: 10.1016/j.colsurfb.2022.112764] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2022] [Revised: 07/18/2022] [Accepted: 08/07/2022] [Indexed: 11/23/2022]
Abstract
Achieving superlubricity, a state of lubrication where friction nearly vanishes, has become one of the most promising approaches to combat friction-induced energy dissipation and medical device failure. Phospholipids are amphiphilic molecules comprising highly hydrophilic phosphatidylcholine head groups as well as hydrophobic hydrocarbon chains, When solubilized, phospholipids can readily self-assemble to form different structures such as bilayers and vesicles (liposomes). Recently, liposomes have been identified as excellent lubricants, especially in the boundary lubrication regime the most common lubrication status in the field of biotribology. In this review, we summarize recent progress in employing liposomes as key players for employing superlubricity in biomedical applications. The relationship between lipids and liposomes, manufacturing approaches, lubrication regimes, and regulation mechanisms of liposomes are discussed. Finally, we indicate possible future directions for the use of liposome-mediated superlubricity in biomedical applications.
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6
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Zhang S, Lin A, Tao Z, Fu Y, Xiao L, Ruan G, Li Y. Microsphere‐containing hydrogel scaffolds for tissue engineering. Chem Asian J 2022; 17:e202200630. [DOI: 10.1002/asia.202200630] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2022] [Revised: 07/25/2022] [Indexed: 11/10/2022]
Affiliation(s)
- Shihao Zhang
- East China University of Science and Technology Engineering Research Center for Biomaterials of Ministry of Education CHINA
| | - Anqi Lin
- East China University of Science and Technology Engineering Research Center for Biomaterials of Ministry of Education CHINA
| | - Ziwei Tao
- East China University of Science and Technology Engineering Research Center for Biomaterials of Ministry of Education CHINA
| | - Yingying Fu
- East China University of Science and Technology Engineering Research Center for Biomaterials of Ministry of Education CHINA
| | - Lan Xiao
- Queensland University of Technology Centre for Biomedical Technologies AUSTRALIA
| | | | - Yulin Li
- East China University of Science and Technology Meilong Road 130 Shanghai CHINA
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7
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Cao Y, Klein J. Lipids and lipid mixtures in boundary layers: From hydration lubrication to osteoarthritis. Curr Opin Colloid Interface Sci 2022. [DOI: 10.1016/j.cocis.2021.101559] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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8
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Gianetti MM, Guerra R, Vanossi A, Urbakh M, Manini N. Thermal Friction Enhancement in Zwitterionic Monolayers. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2022; 126:2797-2805. [PMID: 35178140 PMCID: PMC8842320 DOI: 10.1021/acs.jpcc.1c09542] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/03/2021] [Revised: 01/19/2022] [Indexed: 06/14/2023]
Abstract
We introduce a model for zwitterionic monolayers and investigate its tribological response to changes in applied load, sliding velocity, and temperature by means of molecular-dynamics simulations. The proposed model exhibits different regimes of motion depending on temperature and sliding velocity. We find a remarkable increase of friction with temperature, which we attribute to the formation and rupture of transient bonds between individual molecules of opposite sliding layers, triggered by the out-of-plane thermal fluctuations of the molecules' orientations. To highlight the effect of the molecular charges, we compare these results with analogous simulations for the charge-free system. These findings are expected to be relevant to nanoscale rheology and tribology experiments of locally-charged lubricated systems such as, e.g., experiments performed on zwitterionic monolayers, phospholipid micelles, or confined polymeric brushes in a surface force apparatus.
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Affiliation(s)
- Melisa M. Gianetti
- Dipartimento
di Fisica, Università degli Studi
di Milano, Via Celoria 16, Milano 20133, Italy
| | - Roberto Guerra
- Center
for Complexity and Biosystems, Department of Physics, University of Milan, via Celoria 16, Milano 20133, Italy
| | - Andrea Vanossi
- CNR-IOM,
Consiglio Nazionale delle Ricerche, Istituto Officina dei Materiali, c/o SISSA, Via Bonomea 265, 34136 Trieste, Italy
- International
School for Advanced Studies (SISSA), Via Bonomea 265, 34136 Trieste, Italy
| | - Michael Urbakh
- Department
of Physical Chemistry, School of Chemistry, The Raymond and Beverly
Sackler Faculty of Exact Sciences and The Sackler Center for Computational
Molecular and Materials Science, Tel Aviv
University, Tel Aviv 6997801, Israel
| | - Nicola Manini
- Dipartimento
di Fisica, Università degli Studi
di Milano, Via Celoria 16, Milano 20133, Italy
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9
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Lei Y, Wang Y, Shen J, Cai Z, Zhao C, Chen H, Luo X, Hu N, Cui W, Huang W. Injectable hydrogel microspheres with self-renewable hydration layers alleviate osteoarthritis. SCIENCE ADVANCES 2022; 8:eabl6449. [PMID: 35108047 PMCID: PMC8809544 DOI: 10.1126/sciadv.abl6449] [Citation(s) in RCA: 78] [Impact Index Per Article: 39.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
Introducing hydration layers to hydrogel microspheres (HMs) by coating the surface with liposomes can effectively reduce friction. However, the lubrication can be inactivated when the surface coatings are damaged. To endow HMs with the ability to form self-renewable hydration layers and maintain cellular homeostasis, rapamycin-liposome-incorporating hyaluronic acid-based HMs (RAPA@Lipo@HMs) were created using microfluidic technology and photopolymerization processes. The RAPA@Lipo@HMs improve joint lubrication by using a smooth rolling mechanism and continuously exposing liposomes on the outer surface to form self-renewable hydration layers via frictional wear. In addition, the released autophagy activator (rapamycin)-loaded cationic liposomes can target negatively charged cartilage through electrostatic interactions and maintain cellular homeostasis by increasing autophagy. Furthermore, the in vivo data showed that the RAPA@Lipo@HMs can alleviate joint wear and delay the progression of osteoarthritis. The RAPA@Lipo@HMs can provide efficient lubrication and potentially alleviate friction-related diseases such as osteoarthritis.
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Affiliation(s)
- Yiting Lei
- Department of Orthopedics, The First Affiliated Hospital of Chongqing Medical University, Orthopedic Laboratory of Chongqing Medical University, No. 1 Youyi Road, Yuzhong District, Chongqing 400016, P. R. China
| | - Yuping Wang
- Department of Orthopedics, The First Affiliated Hospital of Chongqing Medical University, Orthopedic Laboratory of Chongqing Medical University, No. 1 Youyi Road, Yuzhong District, Chongqing 400016, P. R. China
| | - Jieliang Shen
- Department of Orthopedics, The First Affiliated Hospital of Chongqing Medical University, Orthopedic Laboratory of Chongqing Medical University, No. 1 Youyi Road, Yuzhong District, Chongqing 400016, P. R. China
| | - Zhengwei Cai
- Department of Orthopaedics, Shanghai Key Laboratory for Prevention and Treatment of Bone and Joint Diseases, Shanghai Institute of Traumatology and Orthopaedics, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, 197 Ruijin 2nd Road, Shanghai 200025, P. R. China
| | - Chen Zhao
- Department of Orthopedics, The First Affiliated Hospital of Chongqing Medical University, Orthopedic Laboratory of Chongqing Medical University, No. 1 Youyi Road, Yuzhong District, Chongqing 400016, P. R. China
| | - Hong Chen
- Department of Orthopedics, The First Affiliated Hospital of Chongqing Medical University, Orthopedic Laboratory of Chongqing Medical University, No. 1 Youyi Road, Yuzhong District, Chongqing 400016, P. R. China
| | - Xiaoji Luo
- Department of Orthopedics, The First Affiliated Hospital of Chongqing Medical University, Orthopedic Laboratory of Chongqing Medical University, No. 1 Youyi Road, Yuzhong District, Chongqing 400016, P. R. China
| | - Ning Hu
- Department of Orthopedics, The First Affiliated Hospital of Chongqing Medical University, Orthopedic Laboratory of Chongqing Medical University, No. 1 Youyi Road, Yuzhong District, Chongqing 400016, P. R. China
- Corresponding author. (N.H.); (W.C.); (W.H.)
| | - Wenguo Cui
- Department of Orthopaedics, Shanghai Key Laboratory for Prevention and Treatment of Bone and Joint Diseases, Shanghai Institute of Traumatology and Orthopaedics, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, 197 Ruijin 2nd Road, Shanghai 200025, P. R. China
- Corresponding author. (N.H.); (W.C.); (W.H.)
| | - Wei Huang
- Department of Orthopedics, The First Affiliated Hospital of Chongqing Medical University, Orthopedic Laboratory of Chongqing Medical University, No. 1 Youyi Road, Yuzhong District, Chongqing 400016, P. R. China
- Corresponding author. (N.H.); (W.C.); (W.H.)
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10
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Yuan H, Cheng HW, Mears LLE, Huang R, Su R, Qi W, He Z, Valtiner M. Lipid Anchoring Improves Lubrication and Wear Resistance of the Collagen I Matrix. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:13810-13815. [PMID: 34788036 PMCID: PMC8638261 DOI: 10.1021/acs.langmuir.1c01581] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2021] [Revised: 11/06/2021] [Indexed: 05/12/2023]
Abstract
Osteoarthritis is a prevalent degenerative joint disease characterized by progressive articular cartilage loss and destruction. The resultant increase in friction causes severe pain. The collagen I matrix (COL I) has been used clinically for cartilage repair; however, how COL I acts at cartilage surfaces is unclear. Here, we studied adsorption and lubrication of synovial fluid components, albumin, γ-globulin, and the phospholipid DPPC, on COL I under physiological conditions using surface plasmon resonance and an in situ sensing surface force apparatus. Our results revealed COL I had poor lubrication ability, a fairly high coefficient of friction (COF, μ = 0.651 ± 0.013), and surface damage under a 7 mN load. DPPC formed an improved lubricating layer on COL I (μ = 0.072 ± 0.016). In sharp contrast, albumin and γ-globulin exhibited poor lubrication with an order of magnitude higher COF but still provided benefits by protecting COL I from wear. Hence, DPPC on COL I may help optimize COL I implantation design.
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Affiliation(s)
- Hui Yuan
- State
Key Laboratory of Chemical Engineering, Tianjin Key Laboratory of
Membrane Science and Desalination Technology, School of Chemical Engineering
and Technology, Tianjin University and Collaborative
Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China
- Institute
of Applied Physics, Vienna University of
Technology, Vienna 1040, Austria
| | - Hsiu-Wei Cheng
- Institute
of Applied Physics, Vienna University of
Technology, Vienna 1040, Austria
| | - Laura LE Mears
- Institute
of Applied Physics, Vienna University of
Technology, Vienna 1040, Austria
| | - Renliang Huang
- School
of Marine Science and Technology, Tianjin
University, Tianjin 300072, China
| | - Rongxin Su
- State
Key Laboratory of Chemical Engineering, Tianjin Key Laboratory of
Membrane Science and Desalination Technology, School of Chemical Engineering
and Technology, Tianjin University and Collaborative
Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China
| | - Wei Qi
- State
Key Laboratory of Chemical Engineering, Tianjin Key Laboratory of
Membrane Science and Desalination Technology, School of Chemical Engineering
and Technology, Tianjin University and Collaborative
Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China
| | - Zhimin He
- State
Key Laboratory of Chemical Engineering, Tianjin Key Laboratory of
Membrane Science and Desalination Technology, School of Chemical Engineering
and Technology, Tianjin University and Collaborative
Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China
| | - Markus Valtiner
- Institute
of Applied Physics, Vienna University of
Technology, Vienna 1040, Austria
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11
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Li Y, Yuan Z, Yang H, Zhong H, Peng W, Xie R. Recent Advances in Understanding the Role of Cartilage Lubrication in Osteoarthritis. Molecules 2021; 26:6122. [PMID: 34684706 PMCID: PMC8540456 DOI: 10.3390/molecules26206122] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2021] [Revised: 10/04/2021] [Accepted: 10/06/2021] [Indexed: 01/15/2023] Open
Abstract
The remarkable lubrication properties of normal articular cartilage play an essential role in daily life, providing almost frictionless movements of joints. Alterations of cartilage surface or degradation of biomacromolecules within synovial fluid increase the wear and tear of the cartilage and hence determining the onset of the most common joint disease, osteoarthritis (OA). The irreversible and progressive degradation of articular cartilage is the hallmark of OA. Considering the absence of effective options to treat OA, the mechanosensitivity of chondrocytes has captured attention. As the only embedded cells in cartilage, the metabolism of chondrocytes is essential in maintaining homeostasis of cartilage, which triggers motivations to understand what is behind the low friction of cartilage and develop biolubrication-based strategies to postpone or even possibly heal OA. This review firstly focuses on the mechanism of cartilage lubrication, particularly on boundary lubrication. Then the mechanotransduction (especially shear stress) of chondrocytes is discussed. The following summarizes the recent development of cartilage-inspired biolubricants to highlight the correlation between cartilage lubrication and OA. One might expect that the restoration of cartilage lubrication at the early stage of OA could potentially promote the regeneration of cartilage and reverse its pathology to cure OA.
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Affiliation(s)
- Yumei Li
- Key Laboratory of Prevention and Treatment of Cardiovascular and Cerebrovascular Diseases, Ministry of Education, Gannan Medical University, Ganzhou 341000, China; (Y.L.); (H.Y.); (H.Z.)
- School of Basic Medicine, Gannan Medical University, Ganzhou 341000, China
| | - Zhongrun Yuan
- School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, China;
- National Engineering Research Center for Tissue Restoration and Reconstruction, South China University of Technology, Guangzhou 510006, China
| | - Hui Yang
- Key Laboratory of Prevention and Treatment of Cardiovascular and Cerebrovascular Diseases, Ministry of Education, Gannan Medical University, Ganzhou 341000, China; (Y.L.); (H.Y.); (H.Z.)
- Jiangxi Province Key Laboratory of Biomaterials and Biofabrication for Tissue Engineering, Gannan Medical University, Ganzhou 341000, China
- School of Medical Information Engineering, Gannan Medical University, Ganzhou 341000, China
| | - Haijian Zhong
- Key Laboratory of Prevention and Treatment of Cardiovascular and Cerebrovascular Diseases, Ministry of Education, Gannan Medical University, Ganzhou 341000, China; (Y.L.); (H.Y.); (H.Z.)
- Jiangxi Province Key Laboratory of Biomaterials and Biofabrication for Tissue Engineering, Gannan Medical University, Ganzhou 341000, China
- School of Medical Information Engineering, Gannan Medical University, Ganzhou 341000, China
| | - Weijie Peng
- Key Laboratory of Prevention and Treatment of Cardiovascular and Cerebrovascular Diseases, Ministry of Education, Gannan Medical University, Ganzhou 341000, China; (Y.L.); (H.Y.); (H.Z.)
- Jiangxi Province Key Laboratory of Biomaterials and Biofabrication for Tissue Engineering, Gannan Medical University, Ganzhou 341000, China
| | - Renjian Xie
- Key Laboratory of Prevention and Treatment of Cardiovascular and Cerebrovascular Diseases, Ministry of Education, Gannan Medical University, Ganzhou 341000, China; (Y.L.); (H.Y.); (H.Z.)
- Jiangxi Province Key Laboratory of Biomaterials and Biofabrication for Tissue Engineering, Gannan Medical University, Ganzhou 341000, China
- School of Medical Information Engineering, Gannan Medical University, Ganzhou 341000, China
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12
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Lin W, Klein J. Recent Progress in Cartilage Lubrication. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2021; 33:e2005513. [PMID: 33759245 DOI: 10.1002/adma.202005513] [Citation(s) in RCA: 127] [Impact Index Per Article: 42.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2020] [Revised: 11/23/2020] [Indexed: 05/18/2023]
Abstract
Healthy articular cartilage, covering the ends of bones in major joints such as hips and knees, presents the most efficiently-lubricated surface known in nature, with friction coefficients as low as 0.001 up to physiologically high pressures. Such low friction is indeed essential for its well-being. It minimizes wear-and-tear and hence the cartilage degradation associated with osteoarthritis, the most common joint disease, and, by reducing shear stress on the mechanotransductive, cartilage-embedded chondrocytes (the only cell type in the cartilage), it regulates their function to maintain homeostasis. Understanding the origins of such low friction of the articular cartilage, therefore, is of major importance in order to alleviate disease symptoms, and slow or even reverse its breakdown. This progress report considers the relation between frictional behavior and the cellular mechanical environment in the cartilage, then reviews the mechanism of lubrication in the joints, in particular focusing on boundary lubrication. Following recent advances based on hydration lubrication, a proposed synergy between different molecular components of the synovial joints, acting together in enabling the low friction, has been proposed. Additionally, recent development of natural and bio-inspired lubricants is reviewed.
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Affiliation(s)
- Weifeng Lin
- Department of Materials and Interfaces, Weizmann Institute of Science, Rehovot, 76100, Israel
| | - Jacob Klein
- Department of Materials and Interfaces, Weizmann Institute of Science, Rehovot, 76100, Israel
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Angayarkanni S, Kampf N, Klein J. Lipid-Bilayer Assemblies on Polymer-Bearing Surfaces: The Nature of the Slip Plane in Asymmetric Boundary Lubrication. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:15583-15591. [PMID: 33332133 PMCID: PMC7774307 DOI: 10.1021/acs.langmuir.0c02956] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/12/2020] [Revised: 12/03/2020] [Indexed: 06/12/2023]
Abstract
Phospholipid-macromolecule complexes have been proposed to form highly efficient, lubricating boundary layers at artificial soft surfaces or at biological surfaces such as articular cartilage, where the friction reduction is attributed to the hydration lubrication mechanism acting at the exposed, hydrated head groups of the lipids. Here we measure, using a surface force balance, the normal and frictional interactions between model mica substrates across several different configurations of phosphatidylcholine (PC) lipid aggregates and adsorbed polymer (PEO) layers, to provide insight into the nature of such lubricating boundary layers in both symmetric and especially asymmetric configurations. Our results reveal that, irrespective of the configuration, the slip plane between the sliding surfaces reverts wherever possible to a bilayer-bilayer interface where hydration lubrication reduces the friction strongly. Where such an interface is not available, the sliding friction remains high. These findings may account for the low friction observed between both biological and synthetic hydrogel surfaces which may be asymmetrically coated with lipid-based boundary layers and fully support the hydration lubrication mechanism attributed to act at such boundary layers.
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Affiliation(s)
| | - Nir Kampf
- Department of Materials and
Interfaces, Weizmann Institute of Science, Rehovot 76100, Israel
| | - Jacob Klein
- Department of Materials and
Interfaces, Weizmann Institute of Science, Rehovot 76100, Israel
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15
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Angayarkanni SA, Kampf N, Klein J. Surface Interactions between Boundary Layers of Poly(ethylene oxide)-Liposome Complexes: Lubrication, Bridging, and Selective Ligation †. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:15469-15480. [PMID: 31348857 DOI: 10.1021/acs.langmuir.9b01708] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Poly(ethylene oxide), PEO, is widely exploited in biomedical applications, while phosphatidylcholine (PC) lipids (in the form of bilayers or liposomes) have been identified as very efficient boundary lubricants in aqueous media. Here we examine, using a surface force balance (SFB), the interactions between surface-adsorbed layers of PEO complexed with small unilamellar vesicles (SUVs, i.e. liposomes) or with bilayers of PC lipids, both well below and a little above their main gel-to-liquid phase-transition temperatures TM. The morphology of PEO layers (adsorbed onto mica), to which liposomes were added, was examined using atomic force microscopy (AFM) and cryo-scanning electron microscopy (cryo-SEM). Our results reveal that the PC lipids could attach to the PEO either as vesicles or as bilayers, depending on whether they were above or below TM. Under water (no added salt), excellent lubrication, with friction coefficients down to 10-3-10-4, up to contact stresses of 6.5 MPa (comparable to those in the major joints) was observed between two surfaces bearing such PEO-PC complexes. At 0.1 M KNO3 salt concentration (comparable to physiological salt levels), the friction between such surfaces was considerably higher, attributed to bridging by the polymer chains. Remarkably, such bridging could be suppressed and the friction could be restored to its previous low value if the KNO3 was replaced with NaNO3, as a result of the different PEO-mica ligation properties of Na+ compared to those of K+. Our results provide insight into the properties of PEO-PC complexes in potential applications, and large interfacial effects that can result from the seemingly innocuous replacement of K+ by Na+ ions.
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Affiliation(s)
- S A Angayarkanni
- Department of Materials and Interfaces , Weizmann Institute of Science , Rehovot 76100 , Israel
| | - Nir Kampf
- Department of Materials and Interfaces , Weizmann Institute of Science , Rehovot 76100 , Israel
| | - Jacob Klein
- Department of Materials and Interfaces , Weizmann Institute of Science , Rehovot 76100 , Israel
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16
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Wang Z, Li J, Jiang L, Xiao S, Liu Y, Luo J. Zwitterionic Hydrogel Incorporated Graphene Oxide Nanosheets with Improved Strength and Lubricity. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:11452-11462. [PMID: 31404491 DOI: 10.1021/acs.langmuir.9b01640] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Graphene oxide (GO) has been evaluated as a multifunctional cross-linker or reinforcement agent in composite hydrogels. In this study, a nanocomposite hydrogel consisting of GO nanosheets and zwitterionic poly(sulfobetaine methacrylate) (PSBMA) was synthesized in an aqueous system via chemical and physical cross-linking effects. GO nanosheets were well dispersed in the hydrogels and effectively cross-linked into the sulfobetaine methacrylate (SBMA) polymer chains through the electrostatic interactions. The PSBMA hydrogel exhibited a significant enhancement in the compressive stress (close to a 5-fold increase) and a remarkable reduction in the coefficient of friction (COF) (corresponding to a decline of 52-76%) after the embedding of GO nanosheets. These improvements indicate the existence of synergetic interaction and good compatibility between GO nanosheets and the PSBMA hydrogel matrix, which results in an intertwined network structure with higher load-bearing capacity and better lubrication properties. This study provides potential in the development of new graphene-polymer composites, which is beneficial for cartilage replacement with high mechanical properties and excellent lubrication characteristics.
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Affiliation(s)
- Zhongnan Wang
- State Key Laboratory of Tribology , Tsinghua University , Beijing 100084 , China
| | - Jinjin Li
- State Key Laboratory of Tribology , Tsinghua University , Beijing 100084 , China
| | - Liang Jiang
- Tribology Research Institute, State Key Laboratory of Traction Power , Southwest Jiaotong University , Chengdu 610031 , China
| | - Shun Xiao
- School of Biomedical Engineering , Shanghai Jiao Tong University , Shanghai 200030 , China
| | - Yuhong Liu
- State Key Laboratory of Tribology , Tsinghua University , Beijing 100084 , China
| | - Jianbin Luo
- State Key Laboratory of Tribology , Tsinghua University , Beijing 100084 , China
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17
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An alternative model for simulating water between two monolayer surfaces. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2019.111284] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Investigation of the lubrication properties and synergistic interaction of biocompatible liposome-polymer complexes applicable to artificial joints. Colloids Surf B Biointerfaces 2019; 178:469-478. [PMID: 30925370 DOI: 10.1016/j.colsurfb.2019.03.041] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2018] [Revised: 03/12/2019] [Accepted: 03/18/2019] [Indexed: 02/07/2023]
Abstract
Achievement of efficient biolubrication is essential for the design of artificial joints with long lifetimes. This study examines the frictional behaviors and adsorption structures of liposomes and liposome complexes with biocompatible polymers to reveal the underlying lubrication mechanisms between biomimetic bearing surfaces of polyetheretherketone (PEEK) and silicon nitride (Si3N4). The liposomes with increasing carbon chain lengths exhibit the remarkable lubrication capabilities that correlate strongly with the structural integrity of small unilamellar vesicles adsorbed on the Si3N4 surfaces, while the bilayer structures weaken the stability of vesicles against rupture and cause the increase of friction. The synergistic interaction of liposomes and biocompatible negative-charged polymer leads to the formation of a boundary-lubricating layer with high-density liposome-polymer complex structures that can efficiently improve the lubrication properties of liposomes. Our findings might have implications for future biolubrication investigations on biocompatible liposome-polymer complexes applicable to artificial joints at the specified macroscale conditions.
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Duan Y, Liu Y, Li J, Feng S, Wen S. AFM Study on Superlubricity between Ti6Al4V/Polymer Surfaces Achieved with Liposomes. Biomacromolecules 2019; 20:1522-1529. [PMID: 30835459 DOI: 10.1021/acs.biomac.8b01683] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Liposomes have been considered as the boundary lubricant in natural joints. They are also the main component of bionic lubricant. In this study, the tribological properties of liposomes on Ti6Al4V/polymer surface were studied by atomic force microscope (AFM) at the nanoscale. The superlubricity with a friction coefficient of 0.007 was achieved under the maximal pressure of 15 MPa, consisting with the lubrication condition of natural joints. Especially, when the AFM probe was hydrophilically modified and preadsorbed, the friction coefficient and load bearing capacity could be further improved. In addition, the probe with a large radius could maintain the stable lubrication of liposomes in the contact zone. Finally, an optimal lubrication model of liposomes was established and the critical force for superlubricity was also proposed. It was the boundary between elastic deformation and plastic deformation for vesicles. It was also the indicator of the plough effect appearing on the adsorbed layer. This work reveals the interfacial behavior of liposomes and realizes the controllable superlubricity system, providing more guidance for clinical application.
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Affiliation(s)
- Yiqin Duan
- State Key Laboratory of Tribology , Tsinghua University , Beijing 100084 , China
| | - Yuhong Liu
- State Key Laboratory of Tribology , Tsinghua University , Beijing 100084 , China
| | - Jinjin Li
- State Key Laboratory of Tribology , Tsinghua University , Beijing 100084 , China
| | - Shaofei Feng
- State Key Laboratory of Tribology , Tsinghua University , Beijing 100084 , China
| | - Shizhu Wen
- State Key Laboratory of Tribology , Tsinghua University , Beijing 100084 , China
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Wang Y, Wang J. Friction Determination by Atomic Force Microscopy in Field of Biochemical Science. MICROMACHINES 2018; 9:E313. [PMID: 30424246 PMCID: PMC6082115 DOI: 10.3390/mi9070313] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/07/2018] [Revised: 06/12/2018] [Accepted: 06/13/2018] [Indexed: 01/23/2023]
Abstract
Atomic force microscopy (AFM) is an analytical nanotechnology in friction determination between microscale and nanoscale surfaces. AFM has advantages in mechanical measurement, including high sensitivity, resolution, accuracy, and simplicity of operation. This paper will introduce the principles of mechanical measurement by using AFM and reviewing the progress of AFM methods in determining frictions in the field of biochemical science over the past decade. While three friction measurement assays-friction morphology, friction curve and friction process in experimental cases-are mainly introduced, important advances of technology, facilitating future development of AFM are also discussed. In addition to the principles and advances, the authors also give an overview of the shortcomings and restrictions of current AFM methods, and propose potential directions of AFM techniques by combining it with other well-established characterization techniques. AFM methods are expected to see an increase in development and attract wide attention in scientific research.
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Affiliation(s)
- Yan Wang
- College of Bioengineering, Chongqing University, Chongqing 400044, China.
| | - Jianhua Wang
- College of Bioengineering, Chongqing University, Chongqing 400044, China.
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Duan Y, Liu Y, Li J, Wang H, Wen S. Investigation on the Nanomechanics of Liposome Adsorption on Titanium Alloys: Temperature and Loading Effects. Polymers (Basel) 2018; 10:polym10040383. [PMID: 30966418 PMCID: PMC6415199 DOI: 10.3390/polym10040383] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2018] [Revised: 03/27/2018] [Accepted: 03/29/2018] [Indexed: 01/08/2023] Open
Abstract
The mechanical properties of liposomes, determined by the lipid phase state at ambient temperature, have a close relationship with their physiological activities. Here, atomic force microscopy (AFM) was used to produce images and perform force measurements on titanium alloys at two adsorbed temperatures. The mechanical properties were evaluated under repeated loading and unloading, suggesting a better reversibility and resistance of gel phase liposomes. The liquid phase liposomes were irreversibly damaged during the first approach while the gel phase liposomes could bear more iterations, resulting from water flow reversibly going across the membranes. The statistical data offered strong evidence that the lipid membranes in the gel phase are robust enough to resist the tip penetration, mainly due to their orderly organization and strong hydrophobic interactions between lipid molecules. This work regarding the mechanical properties of liposomes with different phases provides guidance for future clinical applications, such as artificial joints.
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Affiliation(s)
- Yiqin Duan
- State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China.
| | - Yuhong Liu
- State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China.
| | - Jinjin Li
- State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China.
| | - Hongdong Wang
- State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China.
| | - Shizhu Wen
- State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China.
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Ultra-low friction between boundary layers of hyaluronan-phosphatidylcholine complexes. Acta Biomater 2017; 59:283-292. [PMID: 28669720 DOI: 10.1016/j.actbio.2017.06.043] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2017] [Revised: 06/27/2017] [Accepted: 06/28/2017] [Indexed: 11/21/2022]
Abstract
The boundary layers coating articular cartilage in synovial joints constitute unique biomaterials, providing lubricity at levels unmatched by any human-made materials. The underlying molecular mechanism of this lubricity, essential to joint function, is not well understood. Here we study the interactions between surfaces bearing attached hyaluronan (hyaluronic acid, or HA) to which different phosphatidylcholine (PC) lipids had been added, in the form of small unilamellar vesicles (SUVs or liposomes), using a surface force balance, to shed light on possible cartilage boundary lubrication by such complexes. Surface-attached HA was complexed with different PC lipids (hydrogenated soy PC (HSPC), 1,2-dimyristoyl-sn-glycero-3-PC (DMPC) and 1-palmitoyl-2-oleoyl-sn-glycero-3-PC (POPC)), followed by rinsing. Atomic force microscopy (AFM) and cryo-scanning electron microscopy (Cryo-SEM) were used to image the HA-PC surface complexes following addition of the SUVs. HA-HSPC complexes provide very efficient lubrication, with friction coefficients as low as μ∼0.001 at physiological pressures P≈150atm, while HA-DMPC and HA-POPC complexes are efficient only at low P (up to 10-20atm). The friction reduction in all cases is attributed to hydration lubrication by highly-hydrated phosphocholine groups exposed by the PC-HA complexes. The greater robustness at high P of the HSPC (C16(15%),C18(85%)) complexes relative to the DMPC ((C14)2) or POPC (C16, C18:1) complexes is attributed to the stronger van der Waals attraction between the HSPC acyl tails, relative to the shorter or un-saturated tails of the other two lipids. Our results shed light on possible lubrication mechanisms at the articular cartilage surface in joints. STATEMENT OF SIGNIFICANCE Can designed biomaterials emulate the unique lubrication ability of articular cartilage, and thus provide potential alleviation to friction-related joint diseases? This is the motivation behind the present study. The principles of cartilage lubrication have attracted considerable attention for decades, and several models have been proposed to elucidate it, however, the mechanism of this ultralow friction is still not clear. In this paper we explore the recent suggestion that its efficient lubrication arises from boundary layers of hyaluronan-lipid complexes at its surface, in particular exploring a range of different phosphatidylcholines (PCs) mimicking the wide range of PCs in synovial joints. The present study suggests a synergistic lubricating behavior of the different lipids in living joints, and potential treatment directions using such biomaterial complexes for widespread cartilage-friction-related diseases such as osteoarthritis.
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Andresen Eguiluz RC, Cook SG, Tan M, Brown CN, Pacifici NJ, Samak MS, Bonassar LJ, Putnam D, Gourdon D. Synergistic Interactions of a Synthetic Lubricin-Mimetic with Fibronectin for Enhanced Wear Protection. Front Bioeng Biotechnol 2017; 5:36. [PMID: 28702455 PMCID: PMC5487421 DOI: 10.3389/fbioe.2017.00036] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2017] [Accepted: 06/02/2017] [Indexed: 11/25/2022] Open
Abstract
Lubricin (LUB), a major mucinous glycoprotein of mammalian synovial fluids, is believed to provide excellent lubrication to cartilage surfaces. Consequently, when joint disease or replacement leads to increased friction and surface damage in the joint, robust synthetic LUB alternatives that could be used therapeutically to improve lubrication and surface protection are needed. Here, we report the characterization of a lubricating multiblock bottlebrush polymer whose architecture was inspired by LUB, and we investigate the role of fibronectin (FN), a glycoprotein found in the superficial zone of cartilage, in mediating the tribological properties of the polymer upon shear between mica surfaces. Our surface forces apparatus (SFA) normal force measurements indicate that the lubricin-mimetic (mimLUB) could be kept anchored between mica surfaces, even under high contact pressures, when an intermediate layer of FN was present. Additional SFA friction measurements show that FN would also extend the wearless friction regime of the polymer up to pressures of 3.4 MPa while ensuring stable friction coefficients (μ ≈ 0.28). These results demonstrate synergistic interactions between mimLUB and FN in assisting the lubrication and wear protection of ideal (mica) substrates upon shear. Collectively, these findings suggest that our proposed mimLUB might be a promising alternative to LUB, as similar mechanisms could potentially facilitate the interaction between the polymer and cartilage surfaces in articular joints and prosthetic implants in vivo.
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Affiliation(s)
| | - Sierra G Cook
- Department of Materials Science and Engineering, Cornell University, Ithaca, NY, United States
| | - Mingchee Tan
- Meinig School of Biomedical Engineering, Cornell University, Ithaca, NY, United States
| | - Cory N Brown
- Department of Materials Science and Engineering, Cornell University, Ithaca, NY, United States
| | - Noah J Pacifici
- Department of Materials Science and Engineering, Cornell University, Ithaca, NY, United States
| | - Mihir S Samak
- Department of Physics, University of Ottawa, Ottawa, ON, Canada
| | - Lawrence J Bonassar
- Meinig School of Biomedical Engineering, Cornell University, Ithaca, NY, United States
| | - David Putnam
- Meinig School of Biomedical Engineering, Cornell University, Ithaca, NY, United States
| | - Delphine Gourdon
- Department of Materials Science and Engineering, Cornell University, Ithaca, NY, United States.,Department of Physics, University of Ottawa, Ottawa, ON, Canada
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