Carcinogenesis, Vol. 21, No. 4, 823-826,
April 2000
© 2000 Oxford University Press
Short Communications |
Peroxisome proliferator-activated receptor 
is restricted to hepatic parenchymal cells, not Kupffer cells: implications for the mechanism of action of peroxisome proliferators in hepatocarcinogenesis
Laboratory of Metabolism, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892 and
1 Curriculum in Toxicology and Laboratory of Hepatobiology and Toxicology, Department of Pharmacology, University of North Carolina, Chapel Hill, NC 27599-7365, USA
Peroxisome proliferators increase hepatocyte proliferation and cause liver tumors in rodents, yet the mechanism of action is not understood. Based on studies with null mice it is known that peroxisome proliferator-activated receptor-
(PPAR) is involved. There is also evidence that Kupffer cells play a central role in peroxisome proliferator-induced carcinogenesis, most likely via mechanisms involving increases in superoxide, activation of nuclear factor 
B and production of tumor necrosis factor- (TNF). However, it is not known whether PPAR is constitutively expressed in Kupffer cells. Therefore, the expression of PPAR isoforms in rat Kupffer and parenchymal cells was examined. Kupffer cells and hepatocytes of >99% purity were isolated from rats fed either a control diet or one containing 0.1% WY-14,643 for 1 week. Protein and RNA were obtained and PPAR expression was analyzed using northern and western blots. PPAR, PPARß and PPAR
mRNA was detected in purified hepatocytes. In Kupffer cells, mRNA encoding PPAR was present while transcripts for PPAR and PPARß were not detected. Immunoblots were consistent with the results found by northern analysis. Moreover, when Kupffer cells from wild-type or PPAR-null mice were treated with WY-14,643 in vitro, superoxide production was similar. Combined, these results show that PPAR is expressed in rat parenchymal cells but not in Kupffer cells. These data are consistent with the hypothesis that parenchymal cells respond to Kupffer cell-derived TNF via mechanisms dependent on PPAR within the parenchymal cells.
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