Simultaneous Prediction Method for Intestinal Absorption and Metabolism Using the Mini-Ussing Chamber System

Area of Science:

• Pharmacology
• Drug Metabolism
• Gastroenterology

Background:

• Traditional methods like Caco-2 and PAMPA for predicting human drug absorption have limitations.
• Induced pluripotent stem (iPS) cell-derived intestinal tissues offer morphological resemblance to human tissues.
• The Ussing chamber is a valuable tool for directly assaying drug permeability and electrophysiological parameters in human intestinal tissues.

Purpose of the Study:

• To present a novel prediction method for intestinal absorption and metabolism using a mini-Ussing chamber.
• To evaluate the utility of human and animal intestinal tissues in predicting drug absorption and metabolism.
• To introduce the transport index (TI) as a key metric for this prediction.

Main Methods:

• Utilized a mini-Ussing chamber with human and animal intestinal tissues.
• Calculated the transport index (TI) based on drug concentrations, tissue accumulation (Tcorr), and basal transport (Xcorr).
• Incorporated metabolites formation index (MFI) within TI for metabolism prediction, validated with ketoconazole.

Main Results:

• The mini-Ussing chamber method successfully predicted drug absorbability rank order and fraction of dose absorbed (Fa) in humans.
• Intestinal metabolism in dogs and rats was predicted, though not quantitatively.
• The MFI component of TI demonstrated predictive capability for intestinal metabolism and absorption.

Conclusions:

• The mini-Ussing chamber, using human and animal intestinal tissues, is a powerful tool for simultaneous prediction of intestinal absorption and metabolism.
• This method offers a more comprehensive approach compared to existing cell-line based assays.
• The TI and MFI provide valuable insights for drug development and pharmacokinetic profiling.