32P-postlabeling analysis of liver DNA adducts in rats chronically fed a choline-devoid diet.

Abstract:

:Liver DNA, obtained at various time intervals from rats chronically fed a choline-devoid diet, was analysed for the presence of aromatic or alkyl adducts by the 32P-postlabeling assay. Alkyl adducts were not detected. Aromatic DNA adduct lesions were revealed, but only at levels (1 adduct per 0.5-3 X 10(9) nucleotides) which are at the limits of the extremely high sensitivity of the method used, levels which remained constant throughout the period of feeding. Thus, contamination of the total environment of the animals with chemical carcinogens does not appear to be responsible for the genesis of the hepatocellular carcinomas that develop in rats chronically fed a choline-devoid diet. The diet, therefore, either acts as a complete carcinogen, or promotes the evolution to cancer of endogenous, 'spontaneously' initiated liver cells.

journal_name

Carcinogenesis

journal_title

Carcinogenesis

authors

Gupta RC,Earley K,Locker J,Lombardi B

doi

10.1093/carcin/8.1.187

subject

Has Abstract

pub_date

1987-01-01 00:00:00

pages

187-9

issue

1

eissn

0143-3334

issn

1460-2180

journal_volume

8

pub_type

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