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Schwörer F, Trapp M, Xu X, Soltwedel O, Dzubiella J, Steitz R, Dahint R. Drastic Swelling of Lipid Oligobilayers by Polyelectrolytes: A Potential Molecular Model for the Internal Structure of Lubricating Films in Mammalian Joints. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:1287-1299. [PMID: 29251938 DOI: 10.1021/acs.langmuir.7b03229] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Osteoarthritis is the most common arthropathy in western civilization. It is primarily caused by the degeneration of lipid-coated cartilage, leading to increased friction in joints. Hyaluronic acid (HA), a negatively charged polysaccharide and the main component of the synovial fluid, is held responsible for joint lubrication. It is believed that HA, adsorbed to the lipid-coated cartilage, forms a protective layer against wear. Studies have shown that the concentration and molecular weight (MW) of HA are reduced in joints suffering from osteoarthritis. On the basis of these observations, local joint injections of HA or mixtures of HA and surface-active phospholipids (SAPLs) have been applied as medical cures to restore the functionality of the joints in a procedure called viscosupplementation. However, this cure is still disputed, and no consensus has been reached with respect to optimum HA concentration and MW. To provide detailed insight in the structural rearrangement of lipid films upon contact with HA or polymeric analogues, we studied the interaction of the polyelectrolyte poly(allylamine hydrochloride) (PAH) with surface-bound oligobilayers of 1,2-dimyristoyl-sn-glycero-3-phosphocholine (DMPC) by neutron reflectivity (NR) and ellipsometry. Using this model system, we found a drastic swelling of the lipid films as a function of PAH concentration, whose strength compares to that in previous studies on HA incubation. In contrast, no significant dependence of film thickness on PAH MW was observed. A detailed picture of the film architecture was developed which inter alia shows that charged PAH is adsorbed to the lipid headgroups, leading to electrostatic repulsion. The swelling behavior is well explained by the equilibrium of Coulomb and van der Waals interactions in a DLVO-based model. Our detailed structural analysis of the PAH/lipid interfacial layer may help to elucidate the mechanisms of viscosupplementation and derive a structure-function relationship for the lubricating interface in mammalian joints.
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Affiliation(s)
- Felicitas Schwörer
- Applied Physical Chemistry, Ruprecht-Karls-Universität Heidelberg , Im Neuenheimer Feld 253, 69120 Heidelberg, Germany
| | - Marcus Trapp
- Institute for Soft Matter and Functional Materials, Helmholtz-Zentrum Berlin , Hahn-Meitner-Platz 1, 14109 Berlin, Germany
| | - Xiao Xu
- Institute for Soft Matter and Functional Materials, Helmholtz-Zentrum Berlin , Hahn-Meitner-Platz 1, 14109 Berlin, Germany
- Institut für Physik, Humboldt-Universität zu Berlin , Newtonstr. 15, 12159 Berlin, Germany
| | - Olaf Soltwedel
- Max Planck Society Outstation at the Heinz-Maier-Leibnitz-Zentrum (MLZ) , Lichtenbergstr. 1, 85747 Garching, Germany
- Physics Department, Technische Universität München , James-Franck-Str. 1, 85747, München, Germany
| | - Joachim Dzubiella
- Institute for Soft Matter and Functional Materials, Helmholtz-Zentrum Berlin , Hahn-Meitner-Platz 1, 14109 Berlin, Germany
- Institut für Physik, Humboldt-Universität zu Berlin , Newtonstr. 15, 12159 Berlin, Germany
| | - Roland Steitz
- Institute for Soft Matter and Functional Materials, Helmholtz-Zentrum Berlin , Hahn-Meitner-Platz 1, 14109 Berlin, Germany
| | - Reiner Dahint
- Applied Physical Chemistry, Ruprecht-Karls-Universität Heidelberg , Im Neuenheimer Feld 253, 69120 Heidelberg, Germany
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Kreuzer M, Strobl M, Reinhardt M, Hemmer M, Hauß T, Dahint R, Steitz R. Impact of a model synovial fluid on supported lipid membranes. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2012; 1818:2648-59. [DOI: 10.1016/j.bbamem.2012.05.022] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2011] [Revised: 05/14/2012] [Accepted: 05/21/2012] [Indexed: 12/20/2022]
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Strobl M, Steitz R, Kreuzer M, Rose M, Herrlich H, Mezei F, Grunze M, Dahint R. BioRef: a versatile time-of-flight reflectometer for soft matter applications at Helmholtz-Zentrum Berlin. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2011; 82:055101. [PMID: 21639532 DOI: 10.1063/1.3581210] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
BioRef is a versatile novel time-of-flight reflectometer featuring a sample environment for in situ infrared spectroscopy at the reactor neutron source BER II of the Helmholtz Zentrum Berlin für Materialien und Energie (HZB). After two years of design and construction phase the instrument has recently undergone commissioning and is now available for specular and off-specular neutron reflectivity measurements. BioRef is especially dedicated to the investigation of soft matter systems and studies at the solid-liquid interface. Due to flexible resolution modes and variable addressable wavelength bands that allow for focusing onto a selected scattering vector range, BioRef enables a broad range of surface and interface investigations and even kinetic studies with subsecond time resolution. The instrumental settings can be tailored to the specific requirements of a wide range of applications. The performance is demonstrated by several reference measurements, and the unique option of in situ on-board infrared spectroscopy is illustrated by the example of a phase transition study in a lipid multilayer film.
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Affiliation(s)
- M Strobl
- University of Heidelberg, Im Neuenheimer Feld 253, 69120 Heidelberg, Germany
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