PT  - JOURNAL ARTICLE
AU  - Raju Subramanian
AU  - Xiaojun Fang
AU  - Thomayant Prueksaritanont
TI  - Structural Characterization of in Vivo Rat Glutathione Adducts and a Hydroxylated Metabolite of Simvastatin Hydroxy Acid
AID  - 10.1124/dmd.30.3.225
DP  - 2002 Mar 01
TA  - Drug Metabolism and Disposition
PG  - 225--230
VI  - 30
IP  - 3
4099  - http://dmd.aspetjournals.org/content/30/3/225.short
4100  - http://dmd.aspetjournals.org/content/30/3/225.full
SO  - Drug Metab Dispos2002 Mar 01; 30
AB  - Simvastatin hydroxy acid (SVA), the pharmacologically active form of simvastatin (SV), is a potent inhibitor of 3-hydroxy-3-methylglutaryl (HMG)-coenzyme A reductase and is formed on hydrolysis of the orally administered SV. In this article, we report the structural characterization of two new dihydroxy glutathione adducts and a trihydroxy derivative of SVA, all found in rat bile. Metabolite I is 5′β,6′β-dihydroxy-4′aα-glutathione-SVA, and metabolite II is a pentanoic acid derivative of metabolite I. The two identified GSH conjugates accounted for 16 and 9% in males and 11 and 5% in females of the total radioactivity (metabolites I and II, respectively). Metabolite III is 3′,5′β,6′β-dihydrotriol-SVA and accounts for 2% (male) and 4% (female) of the total dose in rats. Of these three newly identified metabolites, only metabolite III was also observed in dog bile. The American Society for Pharmacology and Experimental Therapeutics