A bespoke microfluidic pharmacokinetic compartment model for drug absorption using artificial cell membranes

Area of Science:

• Pharmacokinetics
• Drug Delivery
• Biomimetic Modeling

Background:

• Accurate prediction of oral drug absorption is crucial for efficient drug development.
• Current in vitro methods like parallel artificial membrane permeability assays (PAMPA) have limitations in predicting intestinal absorption.
• There is a need for improved in vitro models that better mimic the intestinal environment.

Purpose of the Study:

• To develop and validate a novel pharmacokinetic compartment model for enhanced prediction of intestinal drug absorption.
• To compare the performance of the new model against the current state-of-the-art PAMPA technique.
• To quantify key pharmacokinetic parameters using the developed microfluidic platform.

Main Methods:

• Utilized a three-stage pharmacokinetic compartment model based on microfluidic droplets.
• Employed bespoke, biomimetic artificial cells with membranes composed of l-α-phosphatidylcholine (PC) and l-α-phosphatidylethanolamine (PE).
• Modeled drug proxy transport from the intestinal space into an enterocyte, mimicking blood entry.

Main Results:

• The new model demonstrated a threefold improvement in predicting molecular absorption in the jejunum compared to PAMPA.
• The apparent permeability coefficient (P_app) determined by the model closely resembles that of actual intestinal tissue.
• PAMPA was found to overestimate the apparent permeability coefficient by a factor of 20.

Conclusions:

• The developed microfluidic pharmacokinetic compartment model offers a significant advancement in predicting intestinal drug absorption.
• This biomimetic approach provides more accurate in vitro data relevant to in vivo drug behavior.
• The platform enables precise quantification of pharmacokinetic parameters like half-life, flux, and P_app.