Liposome collapse resulting from an allosteric interaction between 2,6‐dimethyl‐β‐cyclodextrins and lipids
RSCAd_5-95_77746.pdf 1.68 MB
Although heptakis(2,6‐di‐O‐methyl)‐β‐cyclodextrin (DMe‐β‐CDx) has been reported to exhibit higher cytotoxicity than many other cyclodextrins because of the way in which it abstracts cholesterols from liposomes, we have identified another reason for its cytotoxicity based on its interaction with lipids. These interactions exhibited nonlinear sigmoidal responses with Hill coefficient values (n) in the range of 3.0‒3.6, which indicated that this phenomenon involves positive allosterism. Furthermore, analysis by mass spectroscopy revealed that the lipid•DMe‐β‐CDx complexes had stoichiometric ratios in the range of 1:1‒1:4.
Electronic supplementary information (ESI) available: Average hydrodynamic diameter values and UV-vis absorption, 1H NMR, NOESY and CSI-MS spectra. See DOI: 10.1039/c5ra14970c
This work was supported by a JSPS KAKENHI a Grant‐in‐Aid for Scientific Research (B) (Grant No. 25288037).
Royal Society of Chemistry
This journal is © The Royal Society of Chemistry 2015
This is an open access article distributed under the terms of the Creative Commons Attribution 3.0 Unported Licence.