Systematic Evaluation of In Vitro Intestinal Permeability Measurements Across Diverse Chemicals: Insights for...

Area of Science:

• Environmental toxicology
• Pharmacokinetics
• Membrane transport

Background:

• Assessing chemical exposure and toxicokinetics is vital, especially with new approach methods (NAMs).
• In vitro assays like Caco-2 and PAMPA are standard for measuring intestinal permeability.
• Existing assumptions about these assays need systematic investigation.

Purpose of the Study:

• To systematically investigate assumptions about Caco-2 and PAMPA permeability.
• To analyze comprehensive datasets of permeability and partition coefficients.
• To evaluate the reliability of these assays for chemical risk assessment.

Main Methods:

• Analysis of extensive datasets on Caco-2 permeability, PAMPA permeability, and partition coefficients.
• Systematic investigation of correlations between hydrophobicity and permeability.
• Evaluation of assay protocol standardization and data quality.

Main Results:

• Hydrophobicity correlates moderately with PAMPA permeability, which in turn moderately correlates with Caco-2 permeability.
• These correlations are insufficient for reliable prediction or read-across in risk assessments.
• Permeability measurements are highly sensitive to assay conditions and protocol adherence.

Conclusions:

• Hydrophobicity and permeability are not inherently interdependent and should be treated as equally critical parameters.
• Standardized protocols and data quality are crucial for reliable permeability measurements.
• PAMPA and Caco-2 data require careful methodological consideration for accurate risk assessment.