PPARγ is a ligand-activated transcription factor involved in the regulation of lipid homeostasis and may function as a master regulator of adipogenesis. Ligands for PPARγ include antidiabetic drugs of the thiazolidinedione structural class, 15-deoxy-.DELTA.12,14-PGJ2, and NSAIDS. BADGE is a synthetic compound used in the production of polycarbonate and industrial plastics. This compound was recently identified as an antagonist of PPARγ. BADGE binds to PPARγ with an apparent Kd of 100 µM and interferes with the ability of 3T3-L1 and 3T3-F442A cells to undergo hormone-mediated cell differentiation.