1
|
Goto M, Kazama A, Fukuhara K, Sato H, Tamai N, Ito HO, Matsuki H. Membrane fusion of phospholipid bilayers under high pressure: Spherical and irreversible growth of giant vesicles. Biophys Chem 2021; 277:106639. [PMID: 34171580 DOI: 10.1016/j.bpc.2021.106639] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2021] [Revised: 05/29/2021] [Accepted: 06/04/2021] [Indexed: 10/21/2022]
Abstract
Membrane fusion of giant vesicles (GVs) for binary bilayers of unsaturated phospholipids, dioleoylphosphatidyl-ethanolamine (DOPE) having an ability to promote membrane fusion, and its homolog dioleoylphosphatidylcholine (DOPC) having an ability to form GV, was investigated under atmospheric and high pressure. While DOPC formed GVs in the presence of inorganic salts with a multivalent metal ion under atmospheric pressure, an equimolar mixture of DOPE and DOPC formed GVs both in the absence and the presence of LaCl3. We examined the change in size and shape of the GVs of this binary mixture in the absence and presence of LaCl3 as a function of time under atmospheric and high pressure. The size and shape of the GVs in the absence of LaCl3 under atmospheric and high pressure and those in the presence of LaCl3 under atmospheric pressure hardly changed with time. By contrast, the GV in the presence of LaCl3 under high pressure gradually changed in the size and shape with time on a time scale of several hours. Namely, the GV became larger than the original GV due to accelerated membrane fusion and its shape became more spherical. This pressure-induced membrane fusion was completely irreversible, and the growth rate was correlated with the applied pressure. The reason for the GV growth by applying pressure was considered on the basis of thermodynamic phase diagrams. We concluded that the growth is attributable to a closer packing of lipid molecules in the bilayer resulting from their preference of smaller volumes under high pressure. Furthermore, the molecular mechanism of the pressure-induced membrane fusion was explored by observing the fusion of two GVs with almost the same size. From their morphological changes, we revealed that the fusion is caused by the actions of Laplace and osmotic pressure.
Collapse
Affiliation(s)
- Masaki Goto
- Department of Bioengineering, Division of Bioscience and Bioindustry, Graduate School of Technology, Industrial and Social Sciences, Tokushima University, 2-1 Minamijosanjima-cho, Tokushima 770-8513, Japan
| | - Akira Kazama
- Department of Biological Science and Technology, Faculty of Engineering, Tokushima University, 2-1 Minamijosanjima-cho, Tokushima 770-8506, Japan
| | - Kensuke Fukuhara
- Department of Biological Science and Technology, Faculty of Engineering, Tokushima University, 2-1 Minamijosanjima-cho, Tokushima 770-8506, Japan
| | - Honami Sato
- Department of Biological Science and Technology, Faculty of Engineering, Tokushima University, 2-1 Minamijosanjima-cho, Tokushima 770-8506, Japan
| | - Nobutake Tamai
- Department of Bioengineering, Division of Bioscience and Bioindustry, Graduate School of Technology, Industrial and Social Sciences, Tokushima University, 2-1 Minamijosanjima-cho, Tokushima 770-8513, Japan
| | - Hiro-O Ito
- Department of Preventive Dentistry, Division of Oral Science, Graduate School of Biomedical Sciences, Tokushima University, 3-8-15 Kuramoto-cho, Tokushima 770-8504, Japan
| | - Hitoshi Matsuki
- Department of Bioengineering, Division of Bioscience and Bioindustry, Graduate School of Technology, Industrial and Social Sciences, Tokushima University, 2-1 Minamijosanjima-cho, Tokushima 770-8513, Japan.
| |
Collapse
|
2
|
Shimobayashi SF, Hishida M, Kurimura T, Ichikawa M. Nanoscale hydration dynamics of DNA-lipid blend dry films: DNA-size dependency. Phys Chem Chem Phys 2016; 18:31664-31669. [PMID: 27840865 DOI: 10.1039/c6cp06305e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this study, nanoscale hydration dynamics of DNA-lipid blend dry films are investigated via small angle X-ray diffraction. Compared to the hydration of lipid films, fragmented short DNA strands and counterions in stacked lipid layers dramatically accelerate both the relaxation of the lamellar distance to a metastable interval and the subsequent peeling-off process of lipid bilayers. Moreover, genome-sized long DNA and counterions accelerate the relaxation process, but suppress the peeling-off process and simultaneously induce a damped-oscillation of the lamellar interval; this is probably due to the viscoelastic properties of the entangled long DNA dissolved in hydrated water between the stacked lipid bilayers. This study's findings can pave the way for producing cell-sized liposomes, which efficiently encapsulate any arbitrary sized DNA through natural swelling.
Collapse
Affiliation(s)
- S F Shimobayashi
- Department of Chemistry, Ecole Normale Supérieure-PSL Research University, 75005 Paris, France.
| | - M Hishida
- Department of Chemistry, Faculty of Pure and Applied Sciences, University of Tsukuba, Ibaraki 305-8571, Japan
| | - T Kurimura
- Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
| | - M Ichikawa
- Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
| |
Collapse
|