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Related Experiment Videos

Optimizing Caco-2 cell monolayers to increase throughput in drug intestinal absorption analysis.

M Markowska1, R Oberle, S Juzwin

  • 1Department of Drug Metabolism, The R.W. Johnson Pharmaceutical Research Institute, Raritan, NJ 08869, USA. mmarkows@prius.jnj.com

Journal of Pharmacological and Toxicological Methods
|August 8, 2002
PubMed
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High-throughput Caco-2 cell assays for drug absorption can be improved using 24-well plates and analyzing compound mixtures. This method enhances efficiency without compromising the accuracy of intestinal drug permeability assessments.

Area of Science:

  • Pharmacokinetics and Drug Metabolism
  • Cell Biology and Physiology
  • Analytical Chemistry

Background:

  • Optimizing Caco-2 cell assays is crucial for efficient drug intestinal absorption studies.
  • Evaluating different well formats (6-, 12-, 24-well) and membrane sizes impacts Caco-2 monolayer integrity and permeability.
  • Investigating methods to increase throughput, such as analyzing single compounds versus mixtures, is essential for drug development.

Purpose of the Study:

  • To evaluate methods for increasing Caco-2 cell throughput for drug intestinal absorption assessment.
  • To determine the effect of membrane size on Caco-2 cell permeability and monolayer integrity.
  • To assess the validity of analyzing single analytes versus mixtures of analytes for enhanced throughput.

Main Methods:

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  • Transepithelial electrical resistance (TEER) was measured on 0.33, 1.0, and 4.7 cm2 polycarbonate membranes over 25 days.
  • Absorptive transport was quantified using LC-MS/MS assays and liquid scintillation spectrometry.
  • Compounds were tested individually and in mixtures of four and eight analytes to assess throughput and correlation of apparent permeability (Papp) values.

Main Results:

  • Apparent permeability (Papp) values showed good correlation between single analytes and mixtures of four or eight analytes.
  • Drug permeability demonstrated a slight decrease with increasing well size.
  • Transepithelial electrical resistance (TEER) values increased with culture duration across all well sizes.

Conclusions:

  • The 24-well format is optimal for high-throughput Caco-2 cell-based drug absorption assays.
  • Analyzing mixtures of four or eight analytes per well is a valid strategy to further increase assay throughput.
  • These optimized methods enhance the efficiency of preclinical drug permeability assessment.