Stereoselective bile excretion of ibuprofen glucuronide and the transport mechanism in the biliary efflux

Abstract

Abstract: AIM: To illustrate the effects of drug transporters on the bile efflux of ibuprofen glucuronide (IBG), the difference of bile excretion and plasma concentration of ibuprofen(IB)and its glucuronides was studied in EHBR and normal SD rat(SDR).METHODS: After 20 mg/kg of IB enantiomers administrated intravenously, the bile and blood were collected from the rats and the concentration of IB and their glucuronide were measured by HPLC methods.RESULTS: The bile excretion of IBG was obviously (but no totally)suppressed in EHBR (1.7 %±1.0 %, 0.6 %±0.9 % of the dose respectively for S-IBG and R-IBG)compared with that in SDR (18.4 %±4.0 %and 3.0 %±2.4 % of the dose respectively for S-IBG and R-IBG), for both kinds of rats, there are more S-IBG excreted than that of R-IBG.As the result of reduction of IBG excreted in bile, the concentration of IBG was higher in blood in EHBRs.CONCLUSION: The results suggest that Mrp2 is the most important transporter for IBG, and other transporter(s)may participate in the process.

Key words: ibuprofen, glucuronide, EHBR, Mrp2, bile excretion, stereoselectivity

CHEN Xi-jing, Masahiro Iwaki. Stereoselective bile excretion of ibuprofen glucuronide and the transport mechanism in the biliary efflux[J]. Chinese Journal of Clinical Pharmacology and Therapeutics, 2007, 12(10): 1163-1167.

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