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Caco-2 cell permeability vs human gastrointestinal absorption: QSPR analysis
1Department of Pharmaceutical Sciences, School of Pharmacy, University of Southern California, Los Angeles 90033, USA.
Summary
This study develops quantitative structure-permeability relationships for Caco-2 cell permeability and human gastrointestinal absorption. While Caco-2 permeability can be estimated, it precisely predicts GI absorption only for compounds above 5 x 10(-6) cm/s.
Area of Science:
- Pharmacokinetics and Drug Metabolism
- Computational Chemistry
- Biopharmaceutics
Background:
- Predicting oral drug absorption is crucial for drug development.
- Caco-2 cell permeability is a widely used in vitro model for predicting gastrointestinal (GI) absorption.
- Quantitative Structure-Permeability Relationship (QSPR) models aim to correlate molecular structure with permeability.
Purpose of the Study:
- To establish a quantitative structure-permeability relationship (QSPR) for organic molecules using Caco-2 cell permeability.
- To investigate the correlation between Caco-2 cell permeability and human gastrointestinal (GI) absorption.
- To identify key physicochemical parameters influencing Caco-2 cell permeability and GI absorption.
Main Methods:
- Utilized Caco-2 cell permeability and human GI absorption data from existing literature.
- Employed maximum hydrogen bond-forming capacity (Hbc) and Lien's QSAR model.
- Calculated physicochemical parameters, including logarithm of partition coefficient (Clog P), using CQSAR software.
Main Results:
- A significant correlation (r=0.797) was found between Caco-2 permeability (log Pcaco-2) and parameters like Hbc, log Doct, log MW, and charge for 51 compounds.
- Improved correlations were achieved for subgroups: neutral (r=0.968), cationic (r=0.915), and anionic (r=0.931) compounds.
- Caco-2 permeability below 5 x 10(-6) cm/s showed poor predictive accuracy for human GI absorption due to variability.
Conclusions:
- Caco-2 cell permeability can be estimated from molecular structures using physicochemical parameters.
- For compounds with Pcaco-2 > 5 x 10(-6) cm/s, human GI absorption is generally high (50-100%), suitable for oral dosage forms.
- Careful interpretation and use of internal standards are recommended for compounds with Pcaco-2 < 5 x 10(-6) cm/s to avoid excluding potential drug candidates.