Dietary carcinogens and mammary carcinogenesis. Induction of rat mammary carcinomas by administration of heterocyclic amines in cooked foods.

Abstract:

:Grilled or fried meat and fish contain various mutagenic heterocyclic amines, and structures of at least 19 compounds have already been determined. Among these, 10 have been examined for long term carcinogenicity, all proving to be positive. 2-Amino-1-methyl-6-phenylimidazo[4,5-b]pyridine (PhIP), for example, preferentially induced mammary adenocarcinomas in 47% of Fischer 344 female rats when supplemented into the diet at a concentration of 400 parts per million (ppm) for 52 weeks. Moreover, 100 ppm of PhIP for 104 weeks yielded the same incidence. PhIP in the diet for 48 weeks also induced mammary cancer in Sprague-Dawley female rats with incidences of 72 and 25% at 200 ppm and 100 ppm. 2-Amino-3,4-dimethylimidazo[4,5-f]quinoline in the diet at 300 ppm also induced a 25% incidence of mammary adenocarcinomas within 40 weeks. Analysis of PhIP-induced rat mammary carcinomas for ras mutations by polymerase chain reaction-single-strand conformation polymorphism and direct sequencing revealed Ha-ras activation in 3 of 17 carcinomas; all were G-->A transitions at the second letter of codon 12 replacing glycine by glutamic acid. A p53 gene mutation was also found in 1 of 10 carcinomas examined; a G-->T transversion was detected at the third letter of codon 130, with a substitution of asparagine for lysine. PhIP is the most abundant mutagenic and carcinogenic heterocyclic amine in grilled meat, and, therefore, a role for this compound in human carcinogenesis is strongly implied.

journal_name

Cancer

journal_title

Cancer

authors

Nagao M,Ushijima T,Wakabayashi K,Ochiai M,Kushida H,Sugimura T,Hasegawa R,Shirai T,Ito N

doi

10.1002/1097-0142(19940801)74:3+<1063::aid-cncr282

subject

Has Abstract

pub_date

1994-08-01 00:00:00

pages

1063-9

issue

3 Suppl

eissn

0008-543X

issn

1097-0142

journal_volume

74

pub_type

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