Unidirectional inversion of ibuprofen in Caco-2 cells: developing a suitable model for presystemic chiral inversion...

Area of Science:

• Pharmacokinetics and Drug Metabolism
• Gastrointestinal Physiology
• Chiral Chemistry

Background:

• Direct evidence for intestinal chiral inversion of ibuprofen has been limited.
• Preliminary findings suggested ibuprofen undergoes inversion in Caco-2 cells, a human intestinal cell line model.
• Understanding factors influencing this inversion is crucial for drug development and efficacy.

Purpose of the Study:

• To investigate the characteristics of ibuprofen chiral inversion in Caco-2 cells.
• To determine the influence of various biochemical factors on this inversion process.
• To establish Caco-2 cells as a suitable model for studying intestinal chiral inversion.

Main Methods:

• Caco-2 cells were used to study ibuprofen chiral inversion under varying conditions.
• Factors examined included substrate concentration, cell density, serum content, S-ibuprofen presence, sodium azide, Coenzyme A (CoA), and palmitic acid.
• A stereoselective High-Performance Liquid Chromatography (HPLC) method was developed for quantitative analysis.

Main Results:

• Ibuprofen inversion in Caco-2 cells was dose- and cell density-dependent, exhibiting saturable kinetics.
• Serum significantly inhibited inversion, while exogenous CoA and palmitic acid promoted it.
• Sodium azide and the presence of the S-enantiomer also demonstrated inhibitory effects on inversion.

Conclusions:

• This study provides strong evidence for the capacity of intestinal chiral inversion.
• Caco-2 cells serve as a valuable and well-defined model for researching chiral inversion of 2-arylpropionic acids (2-APAs).
• The findings highlight the impact of various biochemical factors on drug stereochemistry within the intestine.