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Related Concept Videos

Two-Compartment Open Model: Extravascular Administration01:12

Two-Compartment Open Model: Extravascular Administration

The two-compartment model for extravascular administration represents a drug's absorption and distribution process. It features a central compartment, where the drug is first absorbed, and a peripheral compartment, which illustrates the drug's distribution throughout the body. The rate of change in drug concentration in the central compartment is calculated by three exponents: absorption, distribution, and elimination.
The absorption exponent (ka) indicates the speed at which the drug is...
Three-Compartment Open Model01:06

Three-Compartment Open Model

The three-compartment open model is a pharmacokinetic model used to describe the distribution and elimination of drugs following extravascular administration. It comprises a central compartment representing the plasma and two peripheral compartments. The highly perfused peripheral compartment represents organs and tissues with a rich blood supply, such as the liver, kidneys, and lungs. The scarcely perfused peripheral compartment represents tissues with lower blood supply, such as adipose...
Methods for Studying Drug Absorption: In vitro01:16

Methods for Studying Drug Absorption: In vitro

In vitro experiments are crucial for understanding the transport and absorption of drugs through biological materials. These studies employ varied methods such as the diffusion cell method, the everted sac technique, and the everted ring technique.
The diffusion cell method uses a two-compartment cell, including a donor compartment with the drug solution, which simulates the environment where the drug is applied, and a receptor compartment with a buffer solution, which simulates the environment...
One-Compartment Open Model: Wagner-Nelson and Loo Riegelman Method for ka Estimation01:24

One-Compartment Open Model: Wagner-Nelson and Loo Riegelman Method for ka Estimation

This lesson introduces two critical methods in pharmacokinetics, the Wagner-Nelson and Loo-Riegelman methods, used for estimating the absorption rate constant (ka) for drugs administered via non-intravenous routes. The Wagner-Nelson method relates ka to the plasma concentration derived from the slope of a semilog percent unabsorbed time plot. However, it is limited to drugs with one-compartment kinetics and can be impacted by factors like gastrointestinal motility or enzymatic degradation.
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Related Experiment Video

Updated: Jun 10, 2026

Models and Methods to Evaluate Transport of Drug Delivery Systems Across Cellular Barriers
18:57

Models and Methods to Evaluate Transport of Drug Delivery Systems Across Cellular Barriers

Published on: October 17, 2013

A Quantitative Efflux Ratio-Integrated Model for Passive Permeability Estimation from Caco-2 Assays.

Grace Zang1, Chunyan Han2, Xin Wang2

  • 1Computational and Systems Biology, University of California, Los Angeles, Los Angeles, CA 90095, USA.

Drug Metabolism and Bioanalysis
|June 9, 2026
PubMed
Summary

A new model, the Efflux Ratio Integrated Model (ERIM), accurately estimates passive permeability from Caco-2 assay data by correcting for active efflux. This simplifies drug discovery by avoiding extra experiments and improving compound selection.

Keywords:
Caco-2P-gp substrateRefflux ratiomodeling.passive permeability

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Last Updated: Jun 10, 2026

Models and Methods to Evaluate Transport of Drug Delivery Systems Across Cellular Barriers
18:57

Models and Methods to Evaluate Transport of Drug Delivery Systems Across Cellular Barriers

Published on: October 17, 2013

Using Caco-2 Cells to Study Lipid Transport by the Intestine
07:00

Using Caco-2 Cells to Study Lipid Transport by the Intestine

Published on: August 20, 2015

Ex Vivo Intestinal Sacs to Assess Mucosal Permeability in Models of Gastrointestinal Disease
06:04

Ex Vivo Intestinal Sacs to Assess Mucosal Permeability in Models of Gastrointestinal Disease

Published on: February 9, 2016

Area of Science:

  • Pharmacology
  • Drug Discovery
  • Biotechnology

Background:

  • Estimating passive permeability is crucial for drug discovery but challenging due to active efflux in Caco-2 assays.
  • Current methods often require complex, costly additional experiments.

Purpose of the Study:

  • Develop a quantitative method to directly estimate passive permeability from standard Caco-2 assay data.
  • Eliminate the need for additional experimental systems.

Main Methods:

  • Developed the empirical Efflux Ratio Integrated Model (ERIM).
  • Incorporated Efflux Ratio (ER) into a correction framework for bidirectional apparent permeability data.
  • Validated the model using 138 compounds and compared it with the Global Average Model (GAM).

Main Results:

  • The Global Average Model (GAM) systematically overestimated passive permeability, increasing with Efflux Ratio (ER), leading to high false-positive rates.
  • ERIM effectively eliminated efflux-dependent bias and significantly reduced false-positive classifications.
  • ERIM maintained low false-negative rates and demonstrated consistent performance across validation rounds.

Conclusions:

  • The Efflux Ratio Integrated Model (ERIM) offers a straightforward and practical method for estimating passive permeability from single Caco-2 assays.
  • ERIM corrects for efflux-related bias, enhancing data interpretability.
  • This approach supports more efficient compound prioritization in early-stage drug discovery.