Abstract
The deformation of giant dioleoylphosphatidylcholine (DOPC) liposomes in solution and the properties of DOPC monolayers were investigated by florescence microscopy and surface pressure-area (π-A) isotherm measurements, respectively. These measurements were taken as functions of pH and ionic strength. When the ionic strength was changed from 0.001 to 0.6 at constant pH of 5.6, the coverage of the DOPC monolayer expanded by 10%, and the liposomes formed small protrusions. When the pH was changed from 5.6 to 3.5 at a constant ionic strength of 0.001, the monolayer coverage shrank by 10 %. During this process the external liposome morphology remained the same, but new, smaller vesicles appeared within the interior of the liposomes. Simultaneously changing the pH and the ionic strength to their final values (3.5 and 0.6, respectively), resulted in an expanded monolayer and produced long, protruded liposomes. Our results suggest that the deformation of liposomes is not only driven by osmotic pressure but also the condensed states in each monolayers composing liposome membrane.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Similar content being viewed by others
References
Tresset G (2009), PMC Biophysics, 2:3
Moscho A, Orwar O, Chiu DT, Modi BP, Zare RN (1996) Proc Natl Acad Sci. 93:11443
Simons K (2004) Annu Rev Biophys Biomol Struct 33:269
Geng Y, Dalhaimer P, Cai S, Tsai R, Tewari M, Minko T., Discher DE (2007) Nat Nanotechnol 2:249
Bagatolli LA, Gratton E (1999) Biophys J 77(4):2090
Baumgart T, Hess ST, Webb WW (2003) Nature 425:821
Yanagisawa M, Imai M, Taniguchi T (2008) Phys Rev Lett 100:148102
Helfrich, W (1974) Z Naturforsch 29c:182
Boroske E, Elwenspoek M, Helfrich W (1981) Biophys J 34(1):95
Mui BLS, Cullis PR, Evans EA, Madden TD (1993) Biophys J 64:443
Seifert U, Berndl K, Lipowsky R (1991) Phys Rev A 44(2):1182
Svetina S (2009) Chem Phys Chem 10:2769
Rodríguez Niño MR, Lucero A, Rodríguez Patino JM (2008) Colloids Surf A 320:260
Tagami Y, Ikigai H, Oishi Y (2006) Colloids Surf A 284:475.
Seul M, Chen VS, (1993) Phys Rev Lett 70:1658.
Petty MC (1996) Langmuir-Blodgett Films. Cambridge University Press, Cambridge
Victor G (1991) Bioelectrochem Bioenerg 25:105.
Vattulainen I, Mouritsen OG (2005) Diffusion in Membranes, Diffusion in Condensed Matter. In: Heitjans P and Kärger J (ed) Methods, Materials, Models, 2nd ed. Springer, Berlin pp 471-509
Another difference of Langmuir monolayer to monolayer in bilayer GUV is that the monolayer contact with the gas phase. The interaction between the terminal end of DOPC and gas phase is weaker than that between the terminal ends of DOPC. This difference, however, should be a negligible contribution because of the tiny contact area at terminal ends of DOPC with which the gas phase contact compared to other area of DOPC.
McIntosh TJ, Vidal A, Simon SA (2003) Biophys J 85:1656
Evans E, Rawicz W (1990) Phys Rev Lett 64:2094
Sackmann E (1994) FEBS Lett 346:3
Bangham AD, Horne RW (1964) J. Mol. Biol. 8:660
The surface pressure applied at liposome have been estimated about 17-25 mN/m[25, 26]
Rytomaa M, Mustonen P, Kinnunen PKJ (1992) J Biolog Chem 261:22243
Konttila R, Salonen I, Virtanen JA, and Kinnunen PKJ (1988) Biochem 27:7443
Rinaudo M, François Q, Pépin-Donat B (2009) Macromol Symp 278:67
Compressibility modulus of Langmuir monolayers can be determined from the slope of the π–A isotherms (Vollhardt D et al. (2006) Adv Colloid Interf Sci 127:83). The compressibility modulus: E0=Γ(dΠ/dΓ)T, where Γ=1/AN, and A, N, and π are molecular area, Avogadro's number, and surface pressure, respectively.
Acknowledgment
The authors want to thank Dr. Michael Ibele for pointing out mistakes and many valuable discussions of the manuscript. This work was supported by JSPS Research Fellowships for Young Scientists and by Grants-in-Aid for Scientific (No. 21750221).
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2011 Springer-Verlag Berlin Heidelberg
About this paper
Cite this paper
Kuroda, O., Seto, H., Narita, T., Yamanaka, M., Oishi, Y. (2011). Liposome Deformation by Imbalance of pH and Ionic Strength Across the Membrane. In: Starov, V., Procházka, K. (eds) Trends in Colloid and Interface Science XXIV. Progress in Colloid and Polymer Science, vol 138. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-19038-4_9
Download citation
DOI: https://doi.org/10.1007/978-3-642-19038-4_9
Published:
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-19037-7
Online ISBN: 978-3-642-19038-4
eBook Packages: Chemistry and Materials ScienceChemistry and Material Science (R0)