PMID: 11921435Mar 29, 2002Paper

Differentiating members of the thiazolidinedione class: a focus on safety

Diabetes/metabolism Research and Reviews
Harold E Lebovitz

Abstract

Troglitazone, rosiglitazone and pioglitazone are members of the thiazolidinedione (TZD) class - antidiabetic agents that have proven efficacy in the treatment of patients with type 2 diabetes. All three agents are believed to mediate their effects via activation of the gamma isoform of the peroxisome proliferator-activated receptor (PPAR gamma). Despite this common mechanism of action, they all have unique chemical structures and receptor-binding affinities, and consequently, in addition to the class effects (probably mediated through PPAR gamma), each TZD has a unique safety profile. Side effects have been categorized as unique to individual TZDs, or common to the class of drug. Of the unique effects, the best characterized is hepatotoxicity, which has been associated specifically with troglitazone to date. Studies with rosiglitazone and pioglitazone indicate that hepatotoxicity is not a class effect. Further differences in the safety profiles of these agents arise because the oxidative metabolism for each agent occurs by distinct cytochrome pathways: troglitazone and pioglitazone involve CYP 3A4 and CYP 2C8 whereas rosiglitazone is principally metabolized by CYP 2C8. CYP 3A4 is involved in the metabolism of over 150 drugs, he...Continue Reading

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