Different mechanisms of DEHP-induced hepatocellular adenoma tumorigenesis in wild-type and Ppar alpha-null mice.

Journal of Occupational Health
Kayoko TakashimaTamie Nakajima

Abstract

Di (2-ethylhexyl) phthalate (DEHP) exposure is thought to lead to hepatocellular hypertrophy and hyperplasia in rodents mediated via peroxisome proliferator-activated receptor alpha (PPAR alpha). A recent study revealed that long-term exposure to relatively low-dose DEHP (0.05%) caused liver tumors including hepatocellular carcinomas, hepatocellular adenomas, and chologiocellular carcinomas at a higher incidence in Ppar alpha-null mice (25.8%) than in wild-type mice (10.0%). Using tissues with hepatocellular adenoma, microarray (Affymetrix MOE430A) as well as, in part, real-time quantitative PCR analysis was conducted to elucidate the mechanisms of the adenoma formation resulting from DEHP exposure in both genotyped mice. The microarray profiles showed that the up- or down-regulated genes were quite different between hepatocellular adenoma tissues of wild-type and Ppar alpha-null mice exposed to DEHP. The gene expressions of apoptotic peptidase activating factor 1 (Apaf1) and DNA-damage-inducible 45 alpha (Gadd45a) were increased in the hepatocellular adenoma tissues of wild-type mice exposed to DEHP, whereas they were unchanged in corresponding tissues of Ppar alpha-null mice. On the other hand, the expressions of cyclin B2 an...Continue Reading

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