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Leibe, Regina; Fritsch‐Decker, Susanne; Gussmann, Florian; Wagbo, Ane Marit; Wadhwani, Parvesh; Diabaté, Silvia; Wenzel, Wolfgang; Ulrich, Anne S.; Weiss, Carsten
Small (Weinheim an der Bergstrasse, Germany), 08/2023, Letnik: 19, Številka: 34Journal Article
For highly abundant silica nanomaterials, detrimental effects on proteins and phospholipids are postulated as critical molecular initiating events that involve hydrogen‐bonding, hydrophobic, and/or hydrophilic interactions. Here, large unilamellar vesicles with various well‐defined phospholipid compositions are used as biomimetic models to recapitulate membranolysis, a process known to be induced by silica nanoparticles in human cells. Differential analysis of the dominant phospholipids determined in membranes of alveolar lung epithelial cells demonstrates that the quaternary ammonium head groups of phosphatidylcholine and sphingomyelin play a critical and dose‐dependent role in vesicle binding and rupture by amorphous colloidal silica nanoparticles. Surface modification by either protein adsorption or by covalent coupling of carboxyl groups suppresses the disintegration of these lipid vesicles, as well as membranolysis in human A549 lung epithelial cells by the silica nanoparticles. Furthermore, molecular modeling suggests a preferential affinity of silanol groups for choline head groups, which is also modulated by the pH value. Biomimetic lipid vesicles can thus be used to better understand specific phospholipid–nanoparticle interactions at the molecular level to support the rational design of safe advanced materials. Disintegration of large unilamellar vesicles (LUVs) with defined composition of physiological membrane phospholipids (PLs) is indicated by release of a fluorescent reporter. Only in the presence of PLs bearing a choline head group, deleterious interactions with silica nanoparticles occur. Thus, tailor‐made LUVs enable to understand adverse interactions with advanced materials at the molecular level.
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