Peroxisome proliferators (PP) are a large class of structurally dissimilar chemicals. These chemicals have diverse effects in rodents and humans, including regulation of lipid metabolism, growth promotion, and induction of hepatocarcinogenesis. Most, if not all, effects of PP are mediated by three members of the nuclear receptor superfamily called PP-activated receptors (PPAR). In this review, we discuss the evidence that PPARalpha, the predominant PPAR in the, liver is involved in the growth promoting and hepatocarcinogenic effects of PP.
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