Is PAMPA a useful tool for discovery?

Area of Science:

• Pharmacology and Drug Discovery
• Computational Chemistry
• Analytical Chemistry

Background:

• The Parallel Artificial Membrane Permeability Assay (PAMPA) is a method used to assess drug permeability.
• Evaluating experimental variables can refine PAMPA's utility in drug discovery.
• Lipophilicity, often measured by octanol/water distribution coefficients, is a key factor in drug behavior.

Purpose of the Study:

• To review experimental PAMPA data for 40 commercial drugs.
• To evaluate improvements and variables in PAMPA methodology.
• To compare PAMPA results with calculated and measured lipophilicity values.

Main Methods:

• Analysis of existing experimental PAMPA data for 40 low molecular weight drugs.
• Evaluation of literature-reported PAMPA experimental variables and modifications.
• Correlation analysis between PAMPA results and octanol/water distribution coefficients (log D).

Main Results:

• PAMPA data successfully reflects compound lipophilicity.
• The lipophilicity information obtained from PAMPA is comparable to octanol/water partitioning.
• Calculated log D values provide equivalent lipophilicity data more simply than PAMPA.

Conclusions:

• PAMPA is a useful tool for assessing drug lipophilicity in early drug discovery.
• However, calculated log D values offer a more straightforward and efficient alternative for determining lipophilicity.
• Further research may focus on integrating calculated log D into standard drug discovery workflows.