AFM Study of Interaction Forces in Supported Planar DPPC Bilayers in the Presence of General Anesthetic Halothane

TitleAFM Study of Interaction Forces in Supported Planar DPPC Bilayers in the Presence of General Anesthetic Halothane
Publication TypeJournal Article
Year of Publication2006
AuthorsLeonenko, Z., E. Finot, and D. Cramb
JournalBiochimica et Biophysica Acta: Biomembranes
Volume1758
Start Page487
Issue4
Pagination487-492
Date Published04/2006
Keywordsforce spectroscopy, halothane, microdomains, planar bilayer
Abstract

In spite of numerous investigations, the molecular mechanism of general anesthetics action is still not well understood. It has been shown that the anesthetic potency is related to the ability of an anesthetic to partition into the membrane. We have investigated changes in structure, dynamics and forces of interaction in supported dipalmitoylphosphatidylcholine (DPPC) bilayers in the presence of the general anesthetic halothane. In the present study, we measured the forces of interaction between the probe and the bilayer using an atomic force microscope. The changes in force curves as a function of anesthetic incorporation were analyzed. Force measurements were in good agreement with AFM imaging data, and provided valuable information on bilayer thickness, structural transitions, and halothane-induced changes in electrostatic and adhesive properties.

URLhttp://www.sciencedirect.com/science/article/pii/S0005273606000836
DOI10.1016/j.bbamem.2006.02.033
Refereed DesignationRefereed