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Physiologically Based Pharmacokinetic Modeling in Lead Optimization. 2. Rational Bioavailability Design by Global
Pankaj R Daga1, Michael B Bolger2, Ian S Haworth3
1Novartis Institute of Biomedical Research , Emeryville , California 94608 , United States.
Medicinal chemists can now efficiently optimize oral bioavailability (%F) by identifying key compound properties. This study uses physiologically based pharmacokinetic (PBPK) simulations and partial least squares regression (PLS) to map bioavailability landscapes.
Area of Science:
- Computational chemistry
- Drug discovery
- Pharmacokinetics
Background:
- Medicinal chemists optimize oral bioavailability (%F) using experience and rules of thumb.
- Multiparameter optimization is complex due to numerous interacting properties.
- Conflicting strategies can hinder oral bioavailability improvement.
Purpose of the Study:
- To identify the most influential compound properties for oral bioavailability (%F).
- To develop a more efficient method for oral bioavailability optimization in drug discovery.
- To create a predictive model for oral bioavailability landscapes.
Main Methods:
- Physiologically based pharmacokinetic (PBPK) simulations were adapted to predict %F.
- Thousands of PBPK simulations generated a comprehensive bioavailability landscape.
- Quadratic partial least squares regression (PLS) modeled the %F landscape based on sensitive properties.
Main Results:
- PLS identified globally sensitive compound properties influencing %F.
- A continuous surface accurately fitted the bioavailability predictions.
- The PLS model visualizes the %F landscape around specific compounds.
Conclusions:
- This approach significantly enhances the efficiency of oral bioavailability optimization.
- The PLS model provides a rapid method for multiobjective lead optimization.
- Key compound properties can be identified to guide drug design for improved %F.
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