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Anesthetics affect membrane heterogeneity.

K Jørgensen1, J H Ipsen, O G Mouritsen

  • 1Royal Danish School of Pharmacy, Copenhagen.

Annals of the New York Academy of Sciences
|January 1, 1991
PubMed
Summary
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Anesthetics alter lipid membrane structure near phase transitions, creating concentrated regions and broadening specific heat peaks. These findings align with experimental data for general and local anesthetics.

Area of Science:

  • Biophysics
  • Computational Chemistry
  • Pharmacology

Background:

  • Lipid membranes undergo phase transitions affecting their physical properties.
  • General and local anesthetics interact with biological membranes.
  • Understanding anesthetic-membrane interactions is crucial for pharmacology.

Purpose of the Study:

  • To investigate the molecular mechanisms of general and local anesthetic interactions with lipid membranes using computer simulations.
  • To explore the effect of anesthetics on membrane heterogeneity near the gel-to-fluid phase transition.

Main Methods:

  • A simple, general molecular model was employed for computer simulations.
  • The study focused on the region of the gel-to-fluid membrane phase transition.

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Main Results:

  • Anesthetics significantly increase membrane heterogeneity, forming regions of high local anesthetic concentration.
  • This induced heterogeneity leads to a broadening of the specific heat peak.
  • A maximum in the membrane/water partition coefficient was observed under these conditions.

Conclusions:

  • Anesthetic-induced membrane heterogeneity is a key factor influencing membrane properties near phase transitions.
  • The simulation results are consistent with experimental observations for volatile general anesthetics (e.g., halothane) and local anesthetics (e.g., cocaine derivatives).
  • This study provides a molecular-level explanation for observed macroscopic effects of anesthetics on membranes.