Interactions between silica nanoparticles and phospholipid membranes

Kettiger, Helene and Québatte, Gabriela and Perrone, Barbara and Huwyler, Jörg. (2016) Interactions between silica nanoparticles and phospholipid membranes. Biochimica et biophysica acta, 1858 (9). pp. 2163-2170.

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Official URL: http://edoc.unibas.ch/43708/

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Silica nanoparticles (SNPs) are widely used for biomedical applications. However, their parenteral administration may induce hemolysis. Molecular mechanisms leading to this effect are still controversially discussed. We therefore used a combination of biophysical techniques to investigate the interaction of hemolytic and non-hemolytic SNPs with model phospholipid membranes.; Interaction of SNPs with membranes was studied using a dye-leakage assay, dynamic light scattering (DLS), isothermal titration calorimetry, and solid state nuclear magnetic resonance.; The dye leakage assay revealed that only hemolytic, negatively charged SNPs, but not non-hemolytic positively charged SNPs, destabilized POPC based phospholipid bilayers. Interaction of SNPs with lipid vesicles leading to particle agglomeration was demonstrated by DLS. Isothermal titration calorimetry confirmed the interaction between negatively charged SNPs and phospholipids, which is characterized by an exothermic reaction enthalpy ΔH(0)SNP of -0.04cal/g at 25°C. Calorimetric titrations at different temperatures revealed a molar heat capacity change of zero. This finding excluded a contribution of electrostatic interactions. Mechanistic insight was provided by solid state phosphorus-31 NMR and deuterium NMR measurements.; Our results demonstrate that electrostatic interaction between hemolytic SNPs and model phospholipid membranes is negligible. SNPs induce membrane destabilization and adsorptive processes induced by agglomeration of phospholipid vesicles. The interaction is driven by van der Waals forces at the level of the hydration layer on the vesicles surface.
Faculties and Departments:05 Faculty of Science > Departement Pharmazeutische Wissenschaften > Pharmazie > Pharmazeutische Technologie (Huwyler)
UniBasel Contributors:Québatte, Gabriela and Huwyler, Jörg
Item Type:Article, refereed
Article Subtype:Research Article
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:03 Jan 2017 07:59
Deposited On:03 Jan 2017 07:59

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