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The Interaction between Anesthetic Isoflurane and Model-Biomembrane Monolayer Using Simultaneous Quartz Crystal
Yasushi Yamamoto1, Daiki Ito1, Honoka Akatsuka1
1Department of Life Science and Applied Chemistry, Graduate School of Engineering, Nagoya Institute of Technology, Nagoya 466-8555, Japan.
Membranes
|March 27, 2024
Summary
Anesthetic Isoflurane (Iso) interacts with model-biomembranes, affecting water layers. Isoflurane hydrate physisorption and viscosity changes were observed, with significant viscosity changes in DPPC-β-Lactoglobulin mixtures.
Area of Science:
- Biophysics
- Anesthesiology
- Surface Chemistry
Background:
- Anesthetics like Isoflurane (Iso) are crucial in medicine.
- Understanding their interaction with biological membranes is key to anesthesia mechanisms.
- Model-biomembranes offer a simplified system to study these interactions.
Purpose of the Study:
- To investigate the interaction between Isoflurane and various model-biomembranes.
- To elucidate the mechanism of anesthetic action at the membrane interface.
- To explore the role of interfacial water in anesthesia.
Main Methods:
- Utilized quartz crystal microbalance (QCM) and quartz crystal impedance (QCI) for simultaneous measurements.
- Employed model-biomembranes including dipalmitoyl phosphatidyl choline (DPPC) and its mixtures with palmitic acid (PA), Alamethicin (Al), and β-Lactoglobulin (βLG).
- Analyzed physisorption and interfacial viscosity changes of Isoflurane hydrate on the monolayers.
Main Results:
- Isoflurane hydrate was found to physisorb onto all investigated monolayer/water interfaces.
- Interfacial viscosities were altered by Isoflurane interaction.
- DPPC, DPPC-PA, and DPPC-Al monolayers exhibited a two-step process for Isoflurane hydrate physisorption and viscosity changes.
- DPPC-βLG monolayers showed a one-step process, but with a significantly larger viscosity change.
Conclusions:
- Isoflurane interacts with model-biomembranes by physisorption and altering interfacial viscosity.
- The observed effects differ based on the composition of the biomembrane.
- The findings support the hypothesis of anesthetic action involving the release of interfacial hydrated water.
