Mouse liver tumor data: assessment of carcinogenic activity.

Abstract:

:Significant numbers of chemicals have been shown to be carcinogenic in mouse liver although they do not exhibit carcinogenic activity in other organs or tissues of mice or rats. This review focuses on the reasons for the unique susceptibility of the mouse liver to these carcinogens and the extent to which the carcinogenic activity of a chemical in mouse liver can be used to predict carcinogenicity in humans. Many of these mouse liver carcinogens lack genotoxic activity and, as such, have been proposed to be tumor promoters. Two mechanisms that may explain the action of nongenotoxic carcinogens in mouse liver are reviewed. These are: direct action on precursor cancer cells, either to accelerate their growth or to prevent their death and the selective growth advantage, resulting from regenerative hyperplasia of precursor cancer cells in response to the necrosis of normal cells produced by hepatotoxins. Estimating human health risks on the basis of mouse liver tumor data is believed to differ for nongenotoxic and genotoxic carcinogens in two fundamental ways. The first involves intraspecies extrapolation and the second involves low-dose extrapolation. In conclusion, although mouse liver tumor data are seen to be of value in estimating human health hazard, it is important to distinguish between genotoxic and nongenotoxic mechanisms in applying such data. Further study of the biochemical and molecular mechanisms of chemical carcinogens is necessary to determine the relationship between their activity in mouse liver and their activity in humans.

journal_name

Toxicol Ind Health

authors

Pereira MA

doi

10.1177/074823378500100421

subject

Has Abstract

pub_date

1985-12-01 00:00:00

pages

311-33

issue

4

eissn

0748-2337

issn

1477-0393

journal_volume

1

pub_type

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