PT  - JOURNAL ARTICLE
AU  - Youli Lu
AU  - Narisu Bao
AU  - Gereltu Borjihan
AU  - Yanling Ma
AU  - Miaomiao Hu
AU  - Chen Yu
AU  - Shuijun Li
AU  - Jingying Jia
AU  - Ding Yang
AU  - Yiping Wang
TI  - Contribution of Carboxylesterase in Hamster to the Intestinal First-Pass Loss and Low Bioavailability of Ethyl Piperate, an Effective Lipid-Lowering Drug Candidate
AID  - 10.1124/dmd.110.037614
DP  - 2011 May 01
TA  - Drug Metabolism and Disposition
PG  - 796--802
VI  - 39
IP  - 5
4099  - http://dmd.aspetjournals.org/content/39/5/796.short
4100  - http://dmd.aspetjournals.org/content/39/5/796.full
SO  - Drug Metab Dispos2011 May 01; 39
AB  - Ethyl piperate is an effective lipid-lowering drug candidate synthesized from piperine. However, its pharmacokinetic characteristics and oral absorption process remain unclear. A liquid chromatography-tandem mass spectrometry method was applied to determine the oral bioavailability of ethyl piperate. Simulated gastrointestinal pH conditions and intestinal washings were prepared to investigate their contributions to the loss of ethyl piperate. Hydrolysis by carboxylesterase (CES) was evaluated in vitro using microsomes and S9 fractions. In situ intestinal single-pass perfusion experiments were performed to estimate the role of CES in ethyl piperate absorption. The bioavailability of ethyl piperate was extremely low (0.47%) in hamster independent of gastrointestinal environmental effects. Ethyl piperate was a typical substrate of CES with kinetic parameters Km and Vmax of 7.56 ± 1.491 μM and 0.16 ± 0.008 nmol · min−1 · mg protein−1, respectively. CES was responsible for 85.8% of the intestinal hydrolysis of ethyl piperate. Specific inhibition of CES with bis-p-nitrophenyl phosphate (BNPP), decreased degradation clearance to 36% of control with no significant change in absorption clearance. This contrasted with the results of Caco-2 monolayer experiments, which showed a dramatic increase in the apparent permeability coefficient after BNPP treatment. mRNA levels for the CES isozyme, CES2A3, were similar among the three regions of hamster intestine and 60% less than those in liver; CES1B1 mRNA levels were even lower in the intestine and showed a proximal-to-distal decrease. In conclusion, CES markedly contributes to intestinal first-pass hydrolysis of ethyl piperate that is sufficient, but not necessary, to cause the observed extremely low bioavailability.