Carcinogenesis, Vol 18, 1453-1456, Copyright © 1997 by Oxford University Press
ML Rose, DR Germolec, R Schoonhoven and RG Thurman
WY-14,643 [4-chloro-6-(2,3-xylidino)pyrimidinylthio-acetic acid] is a
well-known non-genotoxic carcinogen and peroxisome proliferator that causes
liver cancer in rodents by unknown mechanisms. Its ability to sustain
elevated rates of hepatocyte DNA synthesis is most likely pivotal in the
ultimate development of tumors. The source of this mitogenic stimulus
following treatment of rats with WY-14,643 has been hypothesized to be
Kupffer cells, the resident hepatic macrophages, since they are activated
by peroxisome proliferators in vivo. Therefore, these studies were designed
to determine if Kupffer cells are causally responsible for WY-14
643-induced increases in hepatocyte DNA synthesis in vivo. WY-14,643 (100
mg/kg) increased DNA synthesis 8- fold 24 h after treatment; however,
inactivation of Kupffer cells with methyl palmitate, a nonhydrolyzable
fatty acid ester and known Kupffer cell inhibitor, completely prevented the
mitogenic effect of WY-14,643. On the other hand, the ability of WY-14,643
to induce peroxisomes was not affected by methyl palmitate. These data
demonstrate that induction of peroxisomes is not dependent on factors from
Kupffer cells and support the idea that stimulation of DNA synthesis and
induction of peroxisomes occur via distinct mechanisms. Additionally,
WY-14,643 increased liver mRNA transcripts of the hepatocyte mitogen tumor
necrosis factor alpha (TNF alpha) more than twofold. This increase was also
prevented by inactivating Kupffer cells with methyl palmitate. Therefore,
it is concluded that Kupffer cells are causally responsible for
WY-14,643-induced increases in hepatocyte DNA synthesis most likely by
increasing production of TNF alpha, a hepatic mitogen.
ARTICLES
Kupffer cells are causally responsible for the mitogenic effect of peroxisome proliferators
Department of Pharmacology, University of North Carolina, Chapel Hill, USA.
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