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Updated: Mar 28, 2026
Author Spotlight: An Efficient Methodology to Confidently Differentiate and Characterize Fentanyl Analogs
Published on: November 8, 2024
Membrane Permeability Drives the Extreme Potency of Fentanyl.
Joseph Clayton1,2, George J Farmer3,4,5, Jacqueline Glenn4,5
1Division of Applied Regulatory Science, Office of Clinical Pharmacology, Office of Translational Sciences, Center for Drug Evaluation and Research, United States Food and Drug Administration, Silver Spring, Maryland 20993, United States.
Fentanyl
Area of Science:
- Pharmacology
- Computational Chemistry
- Biophysics
Background:
- Fentanyl is a leading cause of overdose deaths.
- The mechanism behind fentanyl's high potency is not fully understood.
Purpose of the Study:
- To investigate the role of cell membranes in fentanyl's potency.
- To explore the membrane's contribution to fentanyl's in vivo effects.
Main Methods:
- Weighted-ensemble continuous constant pH molecular dynamics (WE-CpHMD) simulations.
- Cell washout experiments using a BRET sensor.
- IAM-HPLC measurements.
Main Results:
- Fentanyl's membrane permeability is significantly higher than other opioids.
- Fentanyl is retained by cells and can repartition into solution.
- Fentanyl exhibits superior phospholipophilicity.
Conclusions:
- Membrane permeation is a key factor in fentanyl's potency and action.
- Understanding membrane interactions can help develop countermeasures for opioid toxicity.
- WE-CpHMD is a useful tool for studying ionizable molecule membrane permeation.
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