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Evaluating Vascular Hyperpermeability-inducing Agents in the Skin with the Miles Assay
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Two Relations to Estimate Membrane Permeability Using Milestoning.

Lane W Votapka1, Christopher T Lee1, Rommie E Amaro1

  • 1Department of Chemistry and Biochemistry, University of California, San Diego , 9500 Gilman Drive, La Jolla, California 92093-0340, United States.

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Summary
This summary is machine-generated.

This study introduces a new method using mean first passage time (MFPT) to predict solute permeability across lipid bilayers. This approach enhances drug design and toxicology by improving passive permeation rate predictions.

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Area of Science:

  • Computational Chemistry
  • Biophysics
  • Pharmacology

Background:

  • Predicting solute permeation across lipid bilayers is crucial for drug design and toxicology.
  • The traditional Inhomogeneous Solubility-Diffusion (ISD) equation relies on the Smoluchowski equation and assumes overdamped dynamics.
  • The complex membrane environment may involve more complex damping conditions than currently modeled.

Purpose of the Study:

  • To derive a variant of the ISD equation based on mean first passage time (MFPT).
  • To demonstrate how milestoning can estimate MFPT and permeability coefficients.
  • To present a damping-agnostic scheme for permeability estimation.

Main Methods:

  • Derivation of a modified Inhomogeneous Solubility-Diffusion (ISD) equation using mean first passage time (MFPT).
  • Application of milestoning to estimate MFPT and permeability coefficients.
  • Development of a second scheme to estimate permeability independent of damping conditions.

Main Results:

  • A theoretical framework was established linking MFPT to membrane permeability.
  • Milestoning was successfully applied to estimate MFPT and, consequently, permeability coefficients.
  • A damping-agnostic method for permeability estimation was validated.

Conclusions:

  • The developed theoretical methods accurately estimate solute permeability across lipid bilayers.
  • These methods offer improved predictions for passive permeation rates, benefiting drug design and toxicology.
  • The study validates the utility of MFPT and milestoning in biophysical transport phenomena.