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Updated: May 4, 2026
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Ex Vivo Intestinal Sacs to Assess Mucosal Permeability in Models of Gastrointestinal Disease
Published on: February 9, 2016
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PAMPA study of the temperature effect on permeability
Gábor Vizserálek1, Tamás Balogh1, Krisztina Takács-Novák1
1Department of Pharmaceutical Chemistry, Semmelweis University, 9 Hőgyes Endre Street, 1092 Budapest, Hungary.
Summary
Drug permeability, measured by the Parallel Artificial Membrane Assay (PAMPA), significantly depends on incubation temperature. This temperature effect varies with drug properties and membrane model, impacting in vivo predictions.
Area of Science:
- Pharmacokinetics and Drug Metabolism
- Physicochemical Properties of Drugs
- In Vitro Assay Development
Background:
- Accurate prediction of drug absorption requires understanding factors influencing membrane permeability.
- The Parallel Artificial Membrane Assay (PAMPA) is a widely used in vitro method for assessing drug permeability.
- Temperature is a critical parameter in biological systems that can affect molecular interactions and transport.
Purpose of the Study:
- To investigate the temperature dependence of drug effective permeability (logPe) using the PAMPA method.
- To evaluate how different membrane models (GIT, BBB, Skin) and compound properties influence this temperature effect.
- To establish the relationship between intrinsic permeability (logP0) and temperature (T).
Main Methods:
- Determined the effective permeability (logPe) of seven diverse drug compounds using PAMPA.
- Utilized three distinct membrane models: Gastrointestinal Tract (GIT), Blood-Brain Barrier (BBB), and Skin.
- Incubated assays across a temperature range of 15-55 °C in 10 °C increments.
Main Results:
- A linear relationship was observed between intrinsic permeability (logP0) and temperature (T) for all compounds.
- The slope of the logP0 = aT + b regression equation effectively quantified the temperature effect on permeability.
- The Skin PAMPA model exhibited the highest sensitivity to temperature changes, followed by GIT and BBB models.
- Acidic compounds showed minimal temperature dependence, while basic compounds displayed a significant increase in permeability with rising temperature.
Conclusions:
- Drug permeability measured by PAMPA is significantly influenced by incubation temperature, with variations based on compound physicochemical properties and the specific PAMPA model used.
- The Skin PAMPA model is particularly sensitive to temperature fluctuations.
- Understanding and controlling incubation temperature in in vitro assays, such as PAMPA, is crucial for improving the accuracy of in vivo pharmacokinetic predictions.
- Human-relevant incubation conditions are essential for reliable in vitro to in vivo extrapolation.
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