title: Pharmacokinetics of clarithromycin in rats with acute renal failure induced by uranyl nitrate.
abstract: In rats pretreated with dexamethasone (an inducer of CYP3A1/2 in rats) and troleandomycin (an inhibitor of CYP3A1/2 in rats), the area under the plasma concentration-time curve from time zero to time infinity (AUC) values of clarithromycin were significantly smaller (365 compared with 600 micro g min/ml) and greater (1410 compared with 581 micro g min/ml), respectively, than those in control rats. This indicated that clarithromycin was metabolized via CYP3A1/2 in rats. The expression of CYP3A1(23) increased in rats with acute renal failure induced by uranyl nitrate (rats with U-ARF). Hence, it could be expected that AUC of clarithromycin could be smaller in rats with U-ARF. However, after intravenous administration of clarithromycin at a dose of 20mg/kg, the AUC and time-averaged total body (Cl) and nonrenal (Cl(nr)) clearance values were comparable between the two groups of rats. The 9000 x g supernatant fraction of liver homogenates in rats with U-ARF had comparable metabolic activities for clarithromycin compared with those in control rats, suggesting that the CYP3A isozyme responsible for metabolism of clarithromycin seemed not to be expressed considerably in the rats. This could explain the comparable AUC, Cl and Cl(nr) values of clarithromycin between the two groups of rats.
authors.affiliation: College of Pharmacy and Research Institute of Pharmaceutical Sciences, Seoul National University, San 56-1, Shinlim-Dong, Kwanak-Gu, Seoul 151-742, Republic of Korea.
authors.forename: Ae K
authors.initials: AK
authors.lastname: Lee
authors.forename: Joo H
authors.initials: JH
authors.lastname: Lee
authors.forename: Jong W
authors.initials: JW
authors.lastname: Kwon
authors.forename: Won B
authors.initials: WB
authors.lastname: Kim
authors.forename: Sang G
authors.initials: SG
authors.lastname: Kim
authors.forename: So H
authors.initials: SH
authors.lastname: Kim
authors.forename: Myung G
authors.initials: MG
authors.lastname: Lee
mesh_terms: D058186:Acute Kidney Injury / Q000139:chemically induced / Q000378:metabolism*; D000818:Animals; D000900:Anti-Bacterial Agents / Q000493:pharmacokinetics*; D019540:Area Under Curve; D001189:Aryl Hydrocarbon Hydroxylases / Q000037:antagonists & inhibitors / Q000096:biosynthesis; D017291:Clarithromycin / Q000493:pharmacokinetics*; D051544:Cytochrome P-450 CYP3A; D003907:Dexamethasone / Q000494:pharmacology; D004790:Enzyme Induction / Q000187:drug effects; D006207:Half-Life; D007275:Injections, Intravenous; D007527:Isoenzymes / Q000378:metabolism; D008297:Male; D008565:Membrane Proteins / Q000819:agonists / Q000037:antagonists & inhibitors / Q000096:biosynthesis; D051381:Rats; D017207:Rats, Sprague-Dawley; D013997:Time Factors; D014217:Troleandomycin / Q000494:pharmacology; D014502:Uranyl Nitrate
chemical_list: D000900:Anti-Bacterial Agents; D007527:Isoenzymes; D008565:Membrane Proteins; D014502:Uranyl Nitrate; D003907:Dexamethasone; D014217:Troleandomycin; D001189:Aryl Hydrocarbon Hydroxylases; C465260:Cyp3a2 protein, rat; C465138:Cyp3a23-3a1 protein, rat; D051544:Cytochrome P-450 CYP3A; D017291:Clarithromycin