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0090-9556/03/3106-776-784$20.00
DMD 31:776-784, 2003

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EFFECTS OF ACUTE RENAL FAILURE ON THE PHARMACOKINETICS OF CHLORZOXAZONE IN RATS

Young Jin Moon, Ae Kyung Lee, Hye Chin Chung, Eun Jung Kim, So Hee Kim, Duk Chul Lee, Inchul Lee, Sang Geon Kim, and Myung Gull Lee

College of Pharmacy and Research Institute of Pharmaceutical Sciences, Seoul National University, Seoul (Y.J.M., A.K.L., H.C.C., E.J.K., S.G.K., M.G.L.); Department of Pharmacology, College of Dentistry and Research Institute of Oral Science, Kangnung National University, Kangnung (S.H.K); Miz Medi Hospital, Seoul (D.C.L.); and Department of Diagnostic Pathology, College of Medicine, University of Ulsan, Asan Foundation, Asan Medical Center, Seoul (I.L.), South Korea

The purpose of this study is to report the changes of CYP2E1, CYP1A2, CYP2B1/2, CYP2C11, CYP3A23, and CYP3A2 expression and pharmacokinetics and tissue distribution of chlorzoxazone (CZX) and 6-hydroxychlorzoxazone (OH-CZX) in rats with acute renal failure induced by uranyl nitrate (U-ARF), and the role of CYP3A23 and CYP3A2 in the formation of OH-CZX in rats with U-ARF. In rats with U-ARF, CYP2C11 decreased to 20% of control, whereas CYP2E1 and CYP3A23 increased 2.3 and 4 times, respectively, compared with control. But expression of CYP1A2 and CYP2B1/2 was not changed by U-ARF. After i.v. administration of CZX at a dose of 20 mg/kg to rats with U-ARF, the areas under the plasma concentration-time curve from time 0 to time infinity (AUCs) of CZX and OH-CZX were significantly smaller and greater, respectively, than those in control rats. In rats with U-ARF, CZX was below the detection limit at 120 min in all rat tissues studied, whereas it was detected in all tissues of control rats at both 30 and 120 min. However, in control rats, OH-CZX was below the detection limit at both 30 and 120 min in all rat tissues except kidney, whereas it was detected in all tissues of rats with U-ARF at both 30 and 120 min. Based on results from supporting experiments with DDT and 2,2-bis(4-chlorophenyl)1,1-dichloroethylene treatment of rats, the contribution of CYP3A23 and CYP3A2 to the enhanced formation of OH-CZX in rats with U-ARF is likely to be negligible.

Address correspondence to: Dr. Myung G. Lee, College of Pharmacy and Research Institute of Pharmaceutical Sciences, Seoul National University, San 56-1, Shinlim-Dong, Kwanak-Gu, Seoul 151-742, South Korea. E-mail: leemg{at}snu.ac.kr




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C. Y. Ahn, S. K. Bae, Y. S. Jung, I. Lee, Y. C. Kim, M. G. Lee, and W. G. Shin
Pharmacokinetic Parameters of Chlorzoxazone and Its Main Metabolite, 6-Hydroxychlorzoxazone, after Intravenous and Oral Administration of Chlorzoxazone to Liver Cirrhotic Rats with Diabetes Mellitus
Drug Metab. Dispos., July 1, 2008; 36(7): 1233 - 1241.
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