Caco-2 Cell Culture as a Model for Famotidine Absorption

Abstract

The aim of the study was to determine penetration properties of Famotidine fro the formulations through colon adenocarcinoma (Caco)-2 cell monolayers and to compare in vitro with in vivo test results. It also aimed to determine the effect of particle size on the penetration properties of Famotidine when microsphere formulations were used. Famotidine was chosen as a model drug and Caco-2 cell culture model was used. Biodegradable Famotidine microspheres of poly(lactide-co-glycolide)(PLGA) polymer (50:50) were prepared by using multiple emulsion technique. Microspheres were coded according to their particle size and polymer[LHIV:60 μm Famotidine-PLGA(high viscosity), SHIV:6 μm Famotidine PLGA(high viscosity), LLIV:60 μm Famotidine-PLGA (low viscosity), SLIV:6 μm Famotidine-PLGA (low viscosity)]. Famotidine solution(5 mg/ml) and microsphere formulations were administered orally to mice and blood drug levels were determined and compared with the Caco-2 cell experiments. Permeability values of Famotidine through Caco-2 cells from various formulations were determined (log k_solution = 7, 274 ± 0, 010, log k_SHIV = −3, 884 ± 0, 033, log k_LHIV = −2, 300 ± 0, 009, log k_SLIV = −4, 076 ± 0, 208, log k_LLIV = 3, 525 ± 0, 045). Our results showed that H₂ receptor antagonists alter the barrier properties of the Caco-2 cell monolayer by causing an increment in the tightness of the tight junctions. Therefore, amount of the H₂ receptor antagonist-like drug at the site of action was found to be important as well as polymer type and particle size of microspheres for drug permeation. Permeation of the drug was lower when higher amounts of Famotidine were present at the diffusion site. A controlled release dosage form of H₂ receptor antagonist-like drugs may be beneficial for long-term treatments.

Keywords :

• Caco-2
• Famotidine
• HPLC
• Microspheres
• Poly(Lactide-Co-Glycolide)