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Related Experiment Videos

Liposomes having high sensitivity to odorants.

S Enomoto1, M Kashiwayanagi, K Kurihara

  • 1Faculty of Pharmaceutical Sciences, Hokkaido University Sapporo Japan.

Biochimica Et Biophysica Acta
|February 11, 1991
PubMed
Summary

Liposome sensitivity to odorants significantly increased with phosphatidylserine (PS) addition, lowering detection thresholds for compounds like amyl acetate. This enhancement, linked to membrane fluidity changes, offers insights into olfactory receptor mechanisms.

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Area of Science:

  • Biochemistry
  • Biophysics
  • Sensory Science

Background:

  • Liposomes are model systems for cell membranes.
  • Understanding odorant interactions with lipid bilayers is crucial for olfaction research.

Purpose of the Study:

  • To investigate methods for enhancing liposome sensitivity to odorants.
  • To explore the role of phosphatidylserine (PS) in modulating liposome responses.
  • To correlate membrane potential changes with membrane fluidity.

Main Methods:

  • Synthesized phosphatidylcholine (PC) liposomes with varying amounts of phosphatidylserine (PS).
  • Measured membrane potential changes and membrane fluidity in response to odorants (amyl acetate, beta-ionone, citral).
  • Assessed the effect of divalent cations (CaCl2, MgCl2) and monovalent cations (NaCl) on liposome responses.

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Main Results:

  • Addition of 10-20% PS to PC liposomes drastically lowered the detection threshold for amyl acetate and beta-ionone.
  • PS addition increased the threshold for citral, indicating odorant-specific effects.
  • Odorant-induced membrane fluidity changes correlated with membrane potential changes.
  • Divalent cations, particularly CaCl2, significantly enhanced liposome responses to amyl acetate.
  • Detection of odorant-induced changes required adsorption of only a few molecules per liposome.

Conclusions:

  • Phosphatidylserine incorporation can significantly enhance liposome sensitivity to certain odorants, mimicking olfactory receptor function.
  • Membrane fluidity changes are closely linked to the generation of membrane potential changes upon odorant binding.
  • Liposomes serve as valuable models for studying the biophysical mechanisms of olfaction.