Effect of a New Hepatoprotective Agent, YH-439, on the Hepatobiliary Transport of Organic Cations (OCs): Selective Inhibition of Sinusoidal OCs Uptake without Influencing Glucose Uptake and Canalicular OCs Excretion

Hong Soon Sun; Li Hong; Choi Min Koo; Chung Suk Jae; Shim Chang Koo

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자료유형: 학술저널

저자정보: Hong Soon Sun (Department of Pharmaceutics, College of Pharmacy, Seoul National University) Li Hong (Department of Pharmaceutics, College of Pharmacy, Seoul National University) Choi Min Koo (Department of Pharmaceutics, College of Pharmacy, Seoul National University) Chung Suk Jae (Department of Pharmaceutics, College of Pharmacy, Seoul National University) Shim Chang Koo (Department of Pharmaceutics, College of Pharmacy, Seoul National University)

저널정보: 대한약학회 Archives of pharmacal research : a publication of the Pharmaceutical Society of Korea Archives of pharmacal research : a publication of the Pharmaceutical Society of Korea 제28권 제3호

발행연도: 2005.1

수록면: 330 - 334 (5page)

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The effect of a new hepatoprotective agent, YH-439, on the hepatobiliary transport of a model organic cation (OC), TBuMA (tributylmethylammonium), was investigated. The area under the plasma concentration-time curve (AUC) from time zero to 4 h following iv administration of TBuMA (6.6 $\mu$mol/kg) was increased significantly when YH-439 in corn oil (300 mg/kg) was orally administered to rats 24 h prior to the experiment. Nevertheless, the cumulative biliary excretion of TBuMA remained unchanged. As a consequence, the apparent biliary clearance ($CL_b$) of TBuMA was decreased significantly as a result of YH-439 pretreatment, consistent with the fact that the in vivo excretion clearance of TBuMA across the canalicular membrane ($CL_{exc}$) was not changed by the pretreatment. The in vitro uptake of TBuMA into isolated hepatocytes was decreased by one half by the pretreatment, owing to a decrease in the apparent V$_{max}$ and $CL_{linear}$, but the $K_m$ for the process remained constant. Most interestingly, however, the sinusoidal uptake of glucose, a nutrient, into hepatocytes was not influenced by the pretreatment, suggesting the YH-439 pretreatment specifically impaired the sinusoidal uptake of OCs. Thus, the OC-specific inhibition of hepatic uptake, without influencing the uptake of glucose, a nutrient, appeared to be associated with the hepatoprotective activity of YH-439.

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