ToxSci Advance Access originally published online on August 13, 2004
Toxicological Sciences 2004 82(1):170-182; doi:10.1093/toxsci/kfh253
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Toxicological Sciences vol. 82 no. 1 © Society of Toxicology 2004; all rights reserved.
Activation of Mouse and Human Peroxisome Proliferator-Activated Receptors (PPARs) by Phthalate Monoesters



* Department of Veterinary Science and The Center for Molecular Toxicology and Carcinogenesis, The Pennsylvania State University, University Park, Pennsylvania 16802;
ExxonMobil Biomedical Sciences Inc., Annandale, New Jersey 08801-0971;
Consultant to Eastman Chemical Company, Rochester, New York 14652-6272; and
Toxicology Consultants Inc., Gibsonia, Pennsylvania 15044
Received July 6, 2004; accepted August 5, 2004
Administration of phthalates is known to cause toxicity and liver cancer in rodents through the activation of peroxisome proliferator-activated receptors (PPARs), and the monoesters appear to be the active metabolites that function as ligands of PPARs. There is evidence that PPARs exhibit significant species differences in response to ligand activation. In this study, the activation of mouse and human PPAR
, PPARß, and PPAR
by a broad class of phthalate monoesters was investigated using a trans-activation assay, functional analysis of PPAR
target gene expression, and a PPAR
-mediated differentiation assay. These studies demonstrated a range in the ability of various phthalate monoesters to activate PPAR
, with the mouse PPAR
generally being activated at lower concentrations and exhibiting a greater response than human PPAR
. Similarly, a range in the trans-activation of mouse PPARß by phthalate monoesters was also observed, but this effect was not found with human PPARß. A number of phthalate monoesters activated both mouse and human PPAR
, with similar sensitivity being exhibited by both receptors. These studies show that the potency and efficacy of phthalate monoesters for the activation of PPAR
and PPAR
increase with increasing side-chain length. These studies also show that mouse PPAR
and PPARß are generally activated at lower concentrations of phthalate monoesters than human PPAR
and PPARß, and that both mouse and human PPAR
exhibit similar sensitivity to phthalate monoesters. Lastly, there is a good relationship between the relative ability of phthalate monoesters to trans-activate PPAR
and PPAR
, and the relative induction of PPAR
target gene mRNA and PPAR
-mediated adipocyte differentiation, respectively.
Key Words: peroxisome proliferator-activated receptors (PPARs); phthalate monoesters.
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