Influence of the Molecular Weight and the Presence of Calcium Ions on the Molecular Interaction of Hyaluronan and DPPC
Thomas Zander,
Vasil M. Garamus,
Andra Dédinaité,
Per M. Claesson,
Piotr Bełdowski,
Krzysztof Górny,
Zbigniew Dendzik,
D. C. Florian Wieland,
Regine Willumeit-Römer
Affiliations
Thomas Zander
Institute of Materials Research, Helmholtz-Zentrum Geesthacht: Centre for Materials and Costal Research, Max-Planck-Straße 1, 21502 Geesthacht, Germany
Vasil M. Garamus
Institute of Materials Research, Helmholtz-Zentrum Geesthacht: Centre for Materials and Costal Research, Max-Planck-Straße 1, 21502 Geesthacht, Germany
Andra Dédinaité
Department of Chemistry, Surface and Corrosion Science, School of Engineering Sciences in Chemistry, Biotechnology and Health, KTH Royal Institute of Technology, Drottning Kristinas väg 51, SE-10044 Stockholm, Sweden
Per M. Claesson
Department of Chemistry, Surface and Corrosion Science, School of Engineering Sciences in Chemistry, Biotechnology and Health, KTH Royal Institute of Technology, Drottning Kristinas väg 51, SE-10044 Stockholm, Sweden
Piotr Bełdowski
Institue of Mathematics and Physics, UTP University of Science and Technology, al. Kaliskiego 7, 85-796 Bydgoszcz, Poland
Krzysztof Górny
Faculty of Science and Technology, University of Silesia in Katowice, 75 Pułku Piechoty 1A, 41-500 Chorzów, Poland
Zbigniew Dendzik
Faculty of Science and Technology, University of Silesia in Katowice, 75 Pułku Piechoty 1A, 41-500 Chorzów, Poland
D. C. Florian Wieland
Institute of Materials Research, Helmholtz-Zentrum Geesthacht: Centre for Materials and Costal Research, Max-Planck-Straße 1, 21502 Geesthacht, Germany
Regine Willumeit-Römer
Institute of Materials Research, Helmholtz-Zentrum Geesthacht: Centre for Materials and Costal Research, Max-Planck-Straße 1, 21502 Geesthacht, Germany
Hyaluronan is an essential physiological bio macromolecule with different functions. One prominent area is the synovial fluid which exhibits remarkable lubrication properties. However, the synovial fluid is a multi-component system where different macromolecules interact in a synergetic fashion. Within this study we focus on the interaction of hyaluronan and phospholipids, which are thought to play a key role for lubrication. We investigate how the interactions and the association structures formed by hyaluronan (HA) and 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC) are influenced by the molecular weight of the bio polymer and the ionic composition of the solution. We combine techniques allowing us to investigate the phase behavior of lipids (differential scanning calorimetry, zeta potential and electrophoretic mobility) with structural investigation (dynamic light scattering, small angle scattering) and theoretical simulations (molecular dynamics). The interaction of hyaluronan and phospholipids depends on the molecular weight, where hyaluronan with lower molecular weight has the strongest interaction. Furthermore, the interaction is increased by the presence of calcium ions. Our simulations show that calcium ions are located close to the carboxylate groups of HA and, by this, reduce the number of formed hydrogen bonds between HA and DPPC. The observed change in the DPPC phase behavior can be attributed to a local charge inversion by calcium ions binding to the carboxylate groups as the binding distribution of hyaluronan and 1,2-dipalmitoyl-sn-glycero-3-phosphocholine is not changed.
