title: Photoinduced Fusion of Lipid Bilayer Membranes.
abstract: We have developed a novel system for photocontrol of the fusion of lipid vesicles through the use of a photosensitive surfactant containing an azobenzene moiety (AzoTAB). Real-time microscopic observations clarified a change in both the surface area and internal volume of vesicles during fusion. We also determined the optimal cholesterol concentrations and temperature for inducing fusion. The mechanism of fusion can be attributed to a change in membrane tension, which is caused by the solubilization of lipids through the isomerization of AzoTAB. We used a micropipet technique to estimate membrane tension and discuss the mechanism of fusion in terms of membrane elastic energy. The obtained results regarding this novel photoinduced fusion could lead to a better understanding of the mechanism of membrane fusion in living cells and may also see wider applications, such as in drug delivery and biomimetic material design.
authors.affiliation: School of Materials Science, Japan Advanced Institute of Science and Technology , 1-1 Asahidai, Nomi, Ishikawa 923-1292, Japan.
authors.forename: Yui
authors.initials: Y
authors.lastname: Suzuki
authors.affiliation: School of Materials Science, Japan Advanced Institute of Science and Technology , 1-1 Asahidai, Nomi, Ishikawa 923-1292, Japan.
authors.forename: Ken H
authors.initials: KH
authors.lastname: Nagai
authors.affiliation: Graduate School of Environmental Studies, Nagoya University , 1 Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8601, Japan.
authors.forename: Anatoly
authors.initials: A
authors.lastname: Zinchenko
authors.affiliation: School of Materials Science, Japan Advanced Institute of Science and Technology , 1-1 Asahidai, Nomi, Ishikawa 923-1292, Japan.
authors.forename: Tsutomu
authors.initials: T
authors.lastname: Hamada
mesh_terms: D002784:Cholesterol; D008051:Lipid Bilayers; D008561:Membrane Fusion
chemical_list: D008051:Lipid Bilayers; D002784:Cholesterol