Carcinogenesis, Vol 19, 1989-1994, Copyright © 1998 by Oxford University Press
JM Peters, T Aoyama, RC Cattley, U Nobumitsu, T Hashimoto and FJ Gonzalez
The mechanisms underlying peroxisome proliferator-induced
hepatocarcinogenesis are unclear but are mediated by the peroxisome
proliferator-activated receptor alpha (PPARalpha). To determine the role of
PPARalpha in the mechanisms of hepatocarcinogenesis, the effect of
Wy-14,643 on expression patterns of acyl CoA oxidase (ACO) and proteins
involved in cell proliferation in the PPARalpha-null mouse were evaluated.
ACO, CDK-1, CDK-2, CDK-4, PCNA and c-myc proteins were significantly
increased in wild-type mice fed Wy-14,643 for 5 weeks or 11 months, as
compared with controls. This effect was not observed in Wy-14,643-treated
PPARalpha-null mice. Expression patterns of cyclin B1, cyclin D, cyclin E
and p53 were not different in any of the groups. mRNAs encoding CDK-1,
CDK-4, cyclin D1 and c-myc were also increased in wild-type mice fed
Wy-14,643 but not in PPARalpha-null mice. These results indicate that the
increase in CDK-1, CDK-4 and c-myc may be caused by an increase in
transcription that is mediated directly or indirectly by PPARalpha. Thus
PPARalpha-dependent alterations in cell cycle regulatory proteins induced
by peroxisome proliferators are likely to contribute to the
hepatocarcinogenicity of peroxisome proliferators.
ARTICLES
Role of peroxisome proliferator-activated receptor alpha in altered cell cycle regulation in mouse liver
Laboratory of Metabolism, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA. jpeters@helix.nih.gov
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