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- W2410004542 abstract "Our laboratory has been examining the mechanisms whereby chemicals are mutagenic in short-term in-vitro assays yet are not carcinogenic in 2-year rodent bioassays. Previous studies indicated that mutagenic carcinogens increased the amount of cell turnover in the target organ, but that mutagenic noncarcinogens failed to do so. The present study compares the incidence of cell proliferation in specific regions of the kidney, which is the site of carcinogenicity, with cell proliferation induced in a nontarget tissue, the liver, by the mutagenic renal tubular carcinogen trgs(2,3-dibromopropyl)phosphate (TRIS). Renal tubular adenocarcinoma induced by TRIS was the only tumor type identified in male F344 rats, and it was localized in the outer medulla. Male F344 rats were fed a diet containing 0, 50, or 100 ppm TRIS for 14 days. These doses were identical to the doses given in the National Toxicology Program cancer bioassay. Replicating cells were labeled with bromodeoxyuridine administered by an osmotic minipump and identified in tissue sections from liver and kidney using immunohistochemical techniques. Examination of liver sections showed no chemically related increases in cell proliferation above control for either dose group. However, in the kidney, TRIS induced significant cell proliferation that was localized in the renal outer medulla region, the target area for carcinogenesis. The labeling index (number of labeled cells/total number of cells counted) in the kidneys of TRIS-exposed rats was increased approximately 4-fold in the outer medulla and was not increased in the cortex or inner medulla. The results of this study suggest an association between the chemically-induced renal cell proliferation and the renal carcinogenicity of TRIS." @default.
- W2410004542 created "2016-06-24" @default.
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- W2410004542 date "2016-01-01" @default.
- W2410004542 modified "2023-09-26" @default.
- W2410004542 title "Site-specific Cell Proliferation in Renal Tubular Cells by the Renal Tubular Carcinogen tris(2,3-" @default.
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