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In vitro evaluation of the interaction of dextrin-colistin conjugates with bacterial lipopolysaccharide.

In vitro evaluation of the interaction of dextrin-colistin conjugates with bacterial lipopolysaccharide.

Roberts, Jessica L., Cattoz, Beatrice N., Schweins, Ralf, Beck, Konrad, Thomas, David W., Griffiths, Peter ORCID: 0000-0002-6686-1271 and Ferguson, Elaine L. (2016) In vitro evaluation of the interaction of dextrin-colistin conjugates with bacterial lipopolysaccharide. Journal of Medicinal Chemistry. ISSN 0022-2623 (Print), 1520-4804 (Online) (doi:10.1021/acs.jmedchem.5b01521)

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Abstract

Dextrin-colistin conjugates have been developed with the aim of reducing clinical toxicity associated with colistin and improving targeting to sites of bacterial infection. This study investigated the in vitro ability of these dextrin-colistin conjugates to bind and modulate bacterial lipopolysaccharide (LPS), and how this binding affects its biological activity. These results showed that colistin, and ‘amylase-activated’ dextrin-colistin conjugate to a lesser extent, bound to LPS and induced significant conformational changes to its structure. In biological studies, both colistin and dextrin-colistin conjugate effectively inhibited LPS-induced hemolysis and TNFα secretion in a concentration-dependent manner, but only dextrin-colistin conjugate did not cause additive toxicity at higher concentrations. This study provides the first direct structural experimental evidence for the binding of dextrin-colistin conjugates and LPS, providing insight into the mode of action of dextrin-colistin conjugates.

Item Type: Article
Additional Information: © 2016 American Chemical Society
Uncontrolled Keywords: Therapeutics, Lipopolysaccharide, Colistin, Small-angle neutron scattering, Nanomedicine, Bioresponsive
Faculty / Department / Research Group: Faculty of Engineering & Science > Department of Pharmaceutical, Chemical & Environmental Sciences
Last Modified: 01 Feb 2017 01:38
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
URI: http://gala.gre.ac.uk/id/eprint/14257

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