1
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Mielke S, Sorkin R, Klein J. Effect of cholesterol on the mechanical stability of gel-phase phospholipid bilayers studied by AFM force spectroscopy. THE EUROPEAN PHYSICAL JOURNAL. E, SOFT MATTER 2023; 46:77. [PMID: 37672138 DOI: 10.1140/epje/s10189-023-00338-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2023] [Accepted: 08/24/2023] [Indexed: 09/07/2023]
Abstract
The remarkably low sliding friction of articular cartilage in the major joints such as hips and knees, which is crucial for its homeostasis and joint health, has been attributed to lipid bilayers forming lubricious boundary layers at its surface. The robustness of such layers, and thus their lubrication efficiency at joint pressures, depends on the lipids forming them, including cholesterol which is a ubiquitous component, and which may act to strengthen of weaken the bilayer. In this work, a systematic study using an atomic force microscope (AFM) was carried out to understand the effect of cholesterol on the nanomechanical stability of two saturated phospholipids, DSPC (1,2-distearoyl-sn-glycero-3-phosphatidlycholine) and DPPC (1,2-dipalmitoyl-sn-glycero- phosphatidylcholine), that differ in acyl chain lengths. Measurements were carried out both in water and in phosphate buffer solution (PBS). The nanomechanical stability of the lipid bilayers was quantitatively evaluated by measuring the breakthrough force needed to puncture the bilayer by the AFM tip. The molar fractions of cholesterol incorporated in the bilayers were 10% and 40%. We found that for both DSPC and DPPC, cholesterol significantly decreases the mechanical stability of the bilayers in solid-ordered (SO) phase. In accordance with the literature, the strengthening effect of salt on the lipid bilayers was also observed. For DPPC with 10 mol % cholesterol, the effect of tip properties and the experimental procedure parameters on the breakthrough forces were also studied. Tip radius (2-42 nm), material (Si, Si3N4, Au) and loading rate (40-1000 nm/s) were varied systematically. The values of the breakthrough forces measured were not significantly affected by any of these parameters, showing that the weakening effect of cholesterol does not result from such changes in experimental conditions. As we have previously demonstrated that mechanical robustness improves the tribological performance of lipid layers, this study helps to shed light on the mechanism of physiological lubrication. Nanoindentation of SDPC bilayers.
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Affiliation(s)
- Salomé Mielke
- Department of Molecular Chemistry and Materials Science, Weizmann Institute of Science, 76100, Rehovot, Israel
| | - Raya Sorkin
- School of Chemistry, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, 6997801, Tel Aviv, Israel.
| | - Jacob Klein
- Department of Molecular Chemistry and Materials Science, Weizmann Institute of Science, 76100, Rehovot, Israel.
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2
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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: 136] [Impact Index Per Article: 45.3] [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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3
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Cartilage lamina splendens inspired nanostructured coating for biomaterial lubrication. J Colloid Interface Sci 2021; 594:435-445. [PMID: 33774399 DOI: 10.1016/j.jcis.2021.03.052] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2020] [Revised: 03/08/2021] [Accepted: 03/09/2021] [Indexed: 11/21/2022]
Abstract
Biomaterials that are used in biological systems, such as polycarbonate urethane (PCU) knee joint implants and contact lenses, generally lack lubrication. This limits their integration with the body and impedes their function. Here, we propose a nanostructured film based on hydrophilic polysaccharide hyaluronic acid conjugated with dopamine (HADN) and zwitterionic reduced glutathione (Glu), which forms a composite coating (HADN-Glu) to enhance the lubrication between cartilage and PCU. HADN was synthesized by carbodiimide chemistry between hyaluronic acid and dopamine and deposited on PCU surface under mild oxidative conditions. Then, zwitterionic peptide-reduced glutathione was bioconjugated to HADN, forming a lubrication film. Analysis based on X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM) and wettability indicated that HADN and Glu had grafted successfully onto the PCU surface. Measurements of the coefficient of friction (COF), friction energy dissipation and cartilage roughness indicated that cartilage was effectively protected by the high lubrication of HADN-Glu. Both at low and high applied loads, this effect was likely due to the enhanced boundary lubrication enabled by HADN-Glu on the PCU surface. Moreover, HADN-Glu is highly biocompatible with chondrocyte cells, suggesting that this film will benefit the design of implants where lubrication is needed.
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4
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Rebenda D, Vrbka M, Čípek P, Toropitsyn E, Nečas D, Pravda M, Hartl M. On the Dependence of Rheology of Hyaluronic Acid Solutions and Frictional Behavior of Articular Cartilage. MATERIALS (BASEL, SWITZERLAND) 2020; 13:E2659. [PMID: 32545213 PMCID: PMC7321645 DOI: 10.3390/ma13112659] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/21/2020] [Revised: 06/03/2020] [Accepted: 06/09/2020] [Indexed: 01/27/2023]
Abstract
Hyaluronic acid (HA) injections represent one of the most common methods for the treatment of osteoarthritis. However, the clinical results of this method are unambiguous mainly because the mechanism of action has not been clearly clarified yet. Viscosupplementation consists, inter alia, of the improvement of synovial fluid rheological properties by injected solution. The present paper deals with the effect of HA molecular weight on the rheological properties of its solutions and also on friction in the articular cartilage model. Viscosity and viscoelastic properties of HA solutions were analyzed with a rotational rheometer in a cone-plate and plate-plate configuration. In total, four HA solutions with molecular weights between 77 kDa and 2010 kDa were tested. The frictional measurements were realized on a commercial tribometer Bruker UMT TriboLab, while the coefficient of friction (CoF) dependency on time was measured. The contact couple consisted of the articular cartilage pin and the plate made from optical glass. The contact was fully flooded with tested HA solutions. Results showed a strong dependency between HA molecular weight and its rheological properties. However, no clear dependence between HA molecular weight and CoF was revealed from the frictional measurements. This study presents new insight into the dependence between rheological and frictional behavior of the articular cartilage, while such an extensive investigation has not been presented before.
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Affiliation(s)
- David Rebenda
- Faculty of Mechanical Engineering, Brno University of Technology, 616 69 Brno, Czech Republic; (M.V.); (P.Č.); (D.N.); (M.H.)
| | - Martin Vrbka
- Faculty of Mechanical Engineering, Brno University of Technology, 616 69 Brno, Czech Republic; (M.V.); (P.Č.); (D.N.); (M.H.)
| | - Pavel Čípek
- Faculty of Mechanical Engineering, Brno University of Technology, 616 69 Brno, Czech Republic; (M.V.); (P.Č.); (D.N.); (M.H.)
| | - Evgeniy Toropitsyn
- Contipro a.s., Dolní Dobrouč 401, 561 02 Dolní Dobrouč, Czech Republic; (E.T.); (M.P.)
| | - David Nečas
- Faculty of Mechanical Engineering, Brno University of Technology, 616 69 Brno, Czech Republic; (M.V.); (P.Č.); (D.N.); (M.H.)
| | - Martin Pravda
- Contipro a.s., Dolní Dobrouč 401, 561 02 Dolní Dobrouč, Czech Republic; (E.T.); (M.P.)
| | - Martin Hartl
- Faculty of Mechanical Engineering, Brno University of Technology, 616 69 Brno, Czech Republic; (M.V.); (P.Č.); (D.N.); (M.H.)
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5
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Wan H, Zhao X, Lin C, Kaper HJ, Sharma PK. Nanostructured Coating for Biomaterial Lubrication through Biomacromolecular Recruitment. ACS APPLIED MATERIALS & INTERFACES 2020; 12:23726-23736. [PMID: 32347093 PMCID: PMC8192053 DOI: 10.1021/acsami.0c04899] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
Biomaterials employed in the articular joint cavity, such as polycarbonate urethane (PCU) for meniscus replacement, lack of lubrication ability, leading to pain and tissue degradation. We present a nanostructured adhesive coating based on dopamine-modified hyaluronan (HADN) and poly-lysine (PLL), which can reestablish boundary lubrication between the cartilage and biomaterial. Lubrication restoration takes place without the need of exogenous lubricious molecules but through a novel strategy of recruitment of native lubricious molecules present in the surrounding milieu. The biomimetic adhesive coating PLL-HADN (78 nm thickness) shows a high adhesive strength (0.51 MPa) to PCU and a high synovial fluid responsiveness. The quartz crystal microbalance with dissipation monitoring shows the formation of a thick and softer layer when these coatings are brought in contact with the synovial fluid. X-ray photoelectron spectroscopy and ConA-Alexa staining show clear signs of lubricious protein (PRG4) recruitment on the PLL-HADN surface. Effective recruitment of a lubricious protein by PLL-HADN caused it to dissipate only one-third of the frictional energy as compared to bare PCU when rubbed against the cartilage. Histology shows that this reduction makes the PLL-HADN highly chondroprotective, whereas PLL-HA coatings still show signs of cartilage wear. Shear forces in the range of 0.07-0.1 N were able to remove ∼80% of the PRG4 from the PCU-PLL-HA but only 27% from the PCU-PLL-HADN. Thus, in this study, we have shown that surface recruitment and strong adsorption of biomacromolecules from the surrounding milieu is an effective biomaterial lubrication strategy. This opens up new possibilities for lubrication system reconstruction for medical devices.
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Affiliation(s)
- Hongping Wan
- Department
of Biomedical Engineering, University of
Groningen and University Medical Center Groningen, Antonius Deusinglaan 1, Groningen 9713 AV, The Netherlands
| | - Xinghong Zhao
- Groningen
Biomolecular Sciences and Biotechnology Institute, Department of Molecular
Genetics, University of Groningen, Nijenborgh 7, Groningen 9747 AG, The
Netherlands
| | - Chengxiong Lin
- Department
of Biomedical Engineering, University of
Groningen and University Medical Center Groningen, Antonius Deusinglaan 1, Groningen 9713 AV, The Netherlands
| | - Hans Jan Kaper
- Department
of Biomedical Engineering, University of
Groningen and University Medical Center Groningen, Antonius Deusinglaan 1, Groningen 9713 AV, The Netherlands
| | - Prashant Kumar Sharma
- Department
of Biomedical Engineering, University of
Groningen and University Medical Center Groningen, Antonius Deusinglaan 1, Groningen 9713 AV, The Netherlands
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6
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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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7
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Wathier M, Lakin BA, Cooper BG, Bansal PN, Bendele AM, Entezari V, Suzuki H, Snyder BD, Grinstaff MW. A synthetic polymeric biolubricant imparts chondroprotection in a rat meniscal tear model. Biomaterials 2018; 182:13-20. [PMID: 30099277 PMCID: PMC6287749 DOI: 10.1016/j.biomaterials.2018.08.009] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2018] [Revised: 07/29/2018] [Accepted: 08/03/2018] [Indexed: 02/07/2023]
Abstract
Intra-articular injection of hyaluronic acid (HA) is used to treat osteoarthritis (OA) as a viscosupplement, yet it only provides short-term benefit because HA is cleaved by hyaluronidase and cleared out of the joint after several days. Therefore, we developed a new polymer biolubricant based on poly-oxanorbornane carboxylate to enhance joint lubrication for a prolonged time. Rheological and biotribological studies of the biolubricant reveal viscoelastic properties and coefficient of friction equivalent and superior to that of healthy synovial fluid, respectively. Furthermore, in an ex vivo bovine cartilage plug model, the biolubricant exhibits superior long-term reduction of friction and wear prevention compared to saline and healthy synovial fluid. ISO 10993 biocompatibility tests demonstrate that the biolubricant polymer is non-toxic. In an in vivo rat medial meniscal tear OA model, where the performance of the leading HA viscosupplement (Synvisc-one®) is comparable to the saline control, treatment with the biolubricant affords significant chondroprotection compared to the saline control.
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Affiliation(s)
- Michel Wathier
- Department of Chemistry, Boston University, Boston, MA, USA; Flex Biomedical, Madison, WI, USA
| | - Benjamin A Lakin
- Center for Advanced Orthopaedic Studies, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA; Department of Biomedical Engineering, Boston University, Boston, MA, USA
| | - Benjamin G Cooper
- Department of Chemistry, Boston University, Boston, MA, USA; Center for Advanced Orthopaedic Studies, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA
| | - Prashant N Bansal
- Center for Advanced Orthopaedic Studies, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA; Department of Biomedical Engineering, Boston University, Boston, MA, USA
| | | | - Vahid Entezari
- Center for Advanced Orthopaedic Studies, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA
| | | | - Brian D Snyder
- Center for Advanced Orthopaedic Studies, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA; Children's Hospital, Boston, MA, USA
| | - Mark W Grinstaff
- Department of Chemistry, Boston University, Boston, MA, USA; Department of Biomedical Engineering, Boston University, Boston, MA, USA; Department of Medicine, Boston University School of Medicine, Boston, MA, USA.
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8
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Abstract
The major synovial joints such as hips and knees are uniquely efficient tribological systems, able to articulate over a wide range of shear rates with a friction coefficient between the sliding cartilage surfaces as low as 0.001 up to pressures of more than 100 atm. No human-made material can match this. The means by which such surfaces maintain their very low friction has been intensively studied for decades and has been attributed to fluid-film and boundary lubrication. Here, we focus especially on the latter: the reduction of friction by molecular layers at the sliding cartilage surfaces. In particular, we discuss such lubrication in the light of very recent advances in our understanding of boundary effects in aqueous media based on the paradigms of hydration lubrication and of the synergism between different molecular components of the synovial joints (namely hyaluronan, lubricin, and phospholipids) in enabling this lubrication.
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Affiliation(s)
- Sabrina Jahn
- Weizmann Institute of Science, Rehovot 76100, Israel;
| | - Jasmine Seror
- Weizmann Institute of Science, Rehovot 76100, Israel;
| | - Jacob Klein
- Weizmann Institute of Science, Rehovot 76100, Israel;
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9
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Sorkin R, Kampf N, Klein J. Effect of Cholesterol on the Stability and Lubrication Efficiency of Phosphatidylcholine Surface Layers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:7459-7467. [PMID: 28666386 DOI: 10.1021/acs.langmuir.7b01521] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The lubrication properties of saturated PC lipid vesicles containing high cholesterol content under high loads were examined by detailed surface force balance measurements of normal and shear forces between two surface-attached lipid layers. Forces between two opposing mica surfaces bearing distearoylphosphatidylcholine (PC) (DSPC) small unilamellar vesicles (SUVs, or liposomes), or bilayers, with varying cholesterol content were measured across water, whereas dimyristoyl PC (DMPC), dipalmitoyl PC (DPPC), and DSPC SUVs containing 40% cholesterol were measured across liposome dispersions of SUVs of the same lipid composition as in the adsorbed layers. The results clearly demonstrate decreased stability and resistance to normal load with the increase in cholesterol content of DSPC SUVs. Friction coefficients between two 10% cholesterol PC-bilayers were in the same range as for 40% cholesterol bilayers (μ ≈ 10-3), indicating that cholesterol has a more substantial effect on the mechanical properties of a bilayer than on its lubrication performance. We further find that the lubrication efficiency of DMPC and DPPC with 40% cholesterol is superior to that of DSPC 40% cholesterol, most likely because of enhanced hydration-lubrication in these systems. We previously found that when experiments are performed in the presence of a lipid reservoir, layers can self-heal and therefore their robustness is less important under such conditions. We conclude that the effect of cholesterol in decreasing the stability is more pronounced than its effect on hydration, but the stability is, in turn, less important when a lipid reservoir is present. This study complements our previous work and sheds light on the effect of cholesterol, a prominent and important physiological lipid, on the mechanical and lubrication properties of gel-phase lipid layers.
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Affiliation(s)
- Raya Sorkin
- Materials and Interfaces Department, Weizmann Institute of Science , Rehovot 76100, Israel
| | - Nir Kampf
- Materials and Interfaces Department, Weizmann Institute of Science , Rehovot 76100, Israel
| | - Jacob Klein
- Materials and Interfaces Department, Weizmann Institute of Science , Rehovot 76100, Israel
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10
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Lin W, Nietzel S, Klapper M, Müllen K, Klein J. Normal and shear forces between surfaces bearing phosphocholinated polystyrene nanoparticles. POLYM ADVAN TECHNOL 2017. [DOI: 10.1002/pat.3859] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Weifeng Lin
- Department of Materials and Interfaces; Weizmann Institute of Science; Rehovot 76100 Israel
| | - Sven Nietzel
- Max Planck Institute for Polymer Research; Ackermannweg 10 D-55128 Mainz Germany
| | - Markus Klapper
- Max Planck Institute for Polymer Research; Ackermannweg 10 D-55128 Mainz Germany
| | - Klaus Müllen
- Max Planck Institute for Polymer Research; Ackermannweg 10 D-55128 Mainz Germany
| | - Jacob Klein
- Department of Materials and Interfaces; Weizmann Institute of Science; Rehovot 76100 Israel
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11
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Duan Y, Liu Y, Zhang C, Chen Z, Wen S. Insight into the Tribological Behavior of Liposomes in Artificial Joints. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:10957-10966. [PMID: 27687876 DOI: 10.1021/acs.langmuir.6b02822] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Liposomes are widely used in drug delivery and gene therapy, and their new role as boundary lubricant in natural/artificial joints has been found in recent years. In this study, the tribological properties of liposomes on titanium alloy (Ti6Al4 V)/UHMWPE interface were studied by a ball-on-disc tribometer. The efficient reduction of friction coefficient and wear on both surfaces under various velocities and loads is found. A multilayer structure of physically adsorbed liposomes on Ti6Al4 V surface was also observed by atomic force microscope (AFM). Except for the hydration mechanism by phosphatidylcholine (PC) groups, the well-performed tribological properties by liposomes is also attributed to the existence of adsorbed liposome layers on both surfaces, which could reduce asperities contact and show great bearing capacity. This work enriches the research on liposomes for lubrication improvement on artificial surface and shows their value in 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
| | - Caixia Zhang
- Beijing Key Laboratory of Advanced Manufacturing Technology, Beijing University of Technology , Beijing 100124, China
| | - Zhe Chen
- 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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12
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Sorkin R, Kampf N, Zhu L, Klein J. Hydration lubrication and shear-induced self-healing of lipid bilayer boundary lubricants in phosphatidylcholine dispersions. SOFT MATTER 2016; 12:2773-84. [PMID: 26861851 DOI: 10.1039/c5sm02475g] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Measurements of normal and shear (frictional) forces between mica surfaces across small unilamellar vesicle (SUV) dispersions of the phosphatidylcholine (PC) lipids DMPC (14:0), DPPC (16:0) and DSPC (18:0) and POPC (16:0, 18:1), at physiologically high pressures, are reported. We have previously studied the normal and shear forces between two opposing surfaces bearing PC vesicles across pure water and showed that liposome lubrication ability improved with increasing acyl chain length, and correlated strongly with the SUV structural integrity on the substrate surface (DSPC > DPPC > DMPC). In the current study, surprisingly, we discovered that this trend is reversed when the measurements are conducted in SUV dispersions, instead of pure water. In their corresponding SUV dispersion, DMPC SUVs ruptured and formed bilayers, which were able to provide reversible and reproducible lubrication with extremely low friction (μ < 10(-4)) up to pressures of 70-90 atm. Similarly, POPC SUVs also formed bilayers which exhibited low friction (μ < 10(-4)) up to pressures as high as 160 atm. DPPC and DSPC SUVs also provided good lubrication, but with slightly higher friction coefficients (μ = 10(-3)-10(-4)). We believe these differences originate from fast self-healing of the softer surface layers (which are in their liquid disordered phase, POPC, or close to it, DMPC), which renders the robustness of the DPPC or DSPC (both in their solid ordered phase) less important in these conditions. Under these circumstances, the enhanced hydration of the less densely packed POPC and DMPC surface layers is now believed to play an important role, and allows enhanced lubrication via the hydration lubrication mechanism. Our findings may have implications for the understanding of complex biological systems such us biolubrication of synovial joints.
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Affiliation(s)
- Raya Sorkin
- Weizmann Institute of Science, Materials and Interfaces Department, Rehovot, Israel.
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13
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Su H, Wang X, Du M, Song Y, Zheng Q. Boundary lubricating properties of hydrophobically modified polyacrylamide. RSC Adv 2016. [DOI: 10.1039/c5ra24777b] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Intermolecular association rather than the robust adsorption layer plays a significant role in boundary lubrication.
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Affiliation(s)
- Heng Su
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization
- Department of Polymer Science and Engineering
- Zhejiang University
- Hangzhou
- China
| | - Xiang Wang
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization
- Department of Polymer Science and Engineering
- Zhejiang University
- Hangzhou
- China
| | - Miao Du
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization
- Department of Polymer Science and Engineering
- Zhejiang University
- Hangzhou
- China
| | - Yihu Song
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization
- Department of Polymer Science and Engineering
- Zhejiang University
- Hangzhou
- China
| | - Qiang Zheng
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization
- Department of Polymer Science and Engineering
- Zhejiang University
- Hangzhou
- China
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14
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Andresen Eguiluz RC, Cook SG, Brown CN, Wu F, Pacifici NJ, Bonassar LJ, Gourdon D. Fibronectin mediates enhanced wear protection of lubricin during shear. Biomacromolecules 2015. [DOI: 10.1021/acs.biomac.5b00810] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Roberto C. Andresen Eguiluz
- Department of Materials Science and Engineering and ‡Department of Biomedical Engineering, Cornell University, Ithaca, New York, United States
| | - Sierra G. Cook
- Department of Materials Science and Engineering and ‡Department of Biomedical Engineering, Cornell University, Ithaca, New York, United States
| | - Cory N. Brown
- Department of Materials Science and Engineering and ‡Department of Biomedical Engineering, Cornell University, Ithaca, New York, United States
| | - Fei Wu
- Department of Materials Science and Engineering and ‡Department of Biomedical Engineering, Cornell University, Ithaca, New York, United States
| | - Noah J. Pacifici
- Department of Materials Science and Engineering and ‡Department of Biomedical Engineering, Cornell University, Ithaca, New York, United States
| | - Lawrence J. Bonassar
- Department of Materials Science and Engineering and ‡Department of Biomedical Engineering, Cornell University, Ithaca, New York, United States
| | - Delphine Gourdon
- Department of Materials Science and Engineering and ‡Department of Biomedical Engineering, Cornell University, Ithaca, New York, United States
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15
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Gaisinskaya-Kipnis A, Jahn S, Goldberg R, Klein J. Effect of Glucosamine Sulfate on Surface Interactions and Lubrication by Hydrogenated Soy Phosphatidylcholine (HSPC) Liposomes. Biomacromolecules 2014; 15:4178-86. [DOI: 10.1021/bm501189g] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
| | - Sabrina Jahn
- Department
of Materials and
Interfaces, Weizmann Institute of Science, 76100 Rehovot, Israel
| | - Ronit Goldberg
- Department
of Materials and
Interfaces, Weizmann Institute of Science, 76100 Rehovot, Israel
| | - Jacob Klein
- Department
of Materials and
Interfaces, Weizmann Institute of Science, 76100 Rehovot, Israel
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