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Title: Membrane interactions and antimicrobial effects of layered double hydroxide nanoparticles
Authors: Malekkhaiat Häffner, S.
Nyström, L.
Nordström, R.
Xu, Z. P.
Davoudi, M.
Malmsten, M.
Schmidtchen, Artur
Keywords: Antimicrobial
Bacteria Flocculation
Issue Date: 2017
Source: Malekkhaiat Häffner, S., Nyström, L., Nordström, R., Xu, Z. P., Davoudi, M., Schmidtchen, A., et al. (2017). Membrane interactions and antimicrobial effects of layered double hydroxide nanoparticles. Physical Chemistry Chemical Physics.
Series/Report no.: Physical Chemistry Chemical Physics
Abstract: Membrane interactions are critical for the successful use of inorganic nanoparticles as antimicrobial agents and as carriers of, or co-actives with, antimicrobial peptides (AMPs). In order to contribute to an increased understanding of these, we here investigate effects of particle size (42–208 nm) on layered double hydroxide (LDH) interactions with both bacteria-mimicking and mammalian-mimicking lipid membranes. LDH binding to bacteria-mimicking membranes, extraction of anionic lipids, as well as resulting membrane destabilization, was found to increase with decreasing particle size, also translating into size-dependent synergistic effects with the antimicrobial peptide LL-37. Due to strong interactions with anionic lipopolysaccharide and peptidoglycan layers, direct membrane disruption of both Gram-negative and Gram-positive bacteria is suppressed. However, LDH nanoparticles cause size-dependent charge reversal and resulting flocculation of both liposomes and bacteria, which may provide a mechanism for bacterial confinement or clearance. Taken together, these findings demonstrate a set of previously unknown behaviors, including synergistic membrane destabilization and dual confinement/killing of bacteria through combined LDH/AMP exposure, of potential therapeutic interest.
ISSN: 1463-9076
DOI: 10.1039/C7CP02701J
Rights: © 2017 The Author(s) (Royal Society of Chemistry). This is the author created version of a work that has been peer reviewed and accepted for publication by Physical Chemistry Chemical Physics, The Author(s) (Royal Society of Chemistry). It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [].
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:LKCMedicine Journal Articles

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