Liposomes having high sensitivity to odorants

Shuichi Enomoto, Makoto Kashiwayanagi, Kenzo Kurihara

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

The conditions to increase the sensitivities of liposomes to odorants were examined. The results obtained are as follows. (1) The minimum concentration of amyl acetate to induce the membrane potential changes (threshold) in phosphatidylcholine (PC) liposomes was about 10-4 M and addition of 10 or 20% phospatidylserine (PS) lowered the threshold to about 10-9 M, which was lower than the thresholds for amyl acetate in the turtle and frog olfactory systems. (2) Similar to amyl acetate, addition of PS to PC greatly lowered the threshold for β-ionone. On the other hand, addition of PS to PC in certain ratio increased the threshold for citral, suggesting that addition of PS to PC does not always increase the responses to all odorants. (3) The membrane fluidity change of the liposomes in response to odorants occurred at similar concentration region where the membrane potential changes occurred. The presence of CaCl2 in external solution much greatly increased both the magnitude of the membrane potential changes and the membrane fluidity changes of the PC-PS liposomes in response to amyl acetate than the presence of NaCl and MgCl2. These results suggest that the membrane fluidity change is related to generation of the membrane potential change. (4) It was estimated that adsorption of less than a few molecules of amyl acetate on single liposome elicits detectable changes in the membrane potential and the membrane fluidity.

Original languageEnglish
Pages (from-to)7-12
Number of pages6
JournalBBA - Biomembranes
Volume1062
Issue number1
DOIs
Publication statusPublished - Feb 11 1991
Externally publishedYes

Fingerprint

Phosphatidylcholines
Membrane Fluidity
Liposomes
Membrane Potentials
Membranes
Fluidity
citral
Norisoprenoids
Magnesium Chloride
Turtles
Anura
Adsorption
Odorants
amyl acetate
Molecules

Keywords

  • Liposome
  • Membrane fluidity
  • Membrane potential
  • Odorant

ASJC Scopus subject areas

  • Biochemistry
  • Biophysics
  • Cell Biology

Cite this

Enomoto, S., Kashiwayanagi, M., & Kurihara, K. (1991). Liposomes having high sensitivity to odorants. BBA - Biomembranes, 1062(1), 7-12. https://doi.org/10.1016/0005-2736(91)90327-5

Liposomes having high sensitivity to odorants. / Enomoto, Shuichi; Kashiwayanagi, Makoto; Kurihara, Kenzo.

In: BBA - Biomembranes, Vol. 1062, No. 1, 11.02.1991, p. 7-12.

Research output: Contribution to journalArticle

Enomoto, S, Kashiwayanagi, M & Kurihara, K 1991, 'Liposomes having high sensitivity to odorants', BBA - Biomembranes, vol. 1062, no. 1, pp. 7-12. https://doi.org/10.1016/0005-2736(91)90327-5
Enomoto, Shuichi ; Kashiwayanagi, Makoto ; Kurihara, Kenzo. / Liposomes having high sensitivity to odorants. In: BBA - Biomembranes. 1991 ; Vol. 1062, No. 1. pp. 7-12.
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