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Local anesthetic-membrane interaction: a multiequilibrium model.

H H Wang, J Earnest, H P Limbacher

Proceedings of the National Academy of Sciences of the United States of America

|September 1, 1983

Summary

This study reveals electrostatic interactions between local anesthetics and cell membranes. Using a spin-labeled anesthetic, researchers found that cationic anesthetics bind to phospholipids and proteins, influencing membrane structure.

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Area of Science:

Biochemistry
Membrane Biophysics
Pharmacology

Background:

Local anesthetics are tertiary amines that interact with cell membranes.
Understanding these interactions is crucial for drug development and membrane biophysics.

Purpose of the Study:

To investigate the electrostatic interactions between local anesthetics and membrane components.
To characterize the binding of tertiary amine anesthetics to phospholipids and proteins.

Main Methods:

Utilized a spin-labeled local anesthetic as a probe.
Employed electron spin resonance (ESR) spectroscopy.
Studied binding to human erythrocyte membranes and lipid vesicles.

Main Results:

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Resolved two spectral components indicating mobile and constrained anesthetic populations.

Identified electrostatic binding between cationic anesthetics and anionic phospholipid phosphates.

Observed broader spectral components in erythrocyte membranes, suggesting interaction with both phospholipids and proteins.

Conclusions:

Membrane-bound tertiary amine anesthetics in cationic form selectively interact with phospholipids and proteins.
Electrostatic forces play a significant role in anesthetic-membrane interactions.
Spin-labeling ESR is a valuable technique for probing molecular interactions within membranes.