Role of mutations at codon 61 of the c-Ha-ras gene during diethylnitrosamine-induced hepatocarcinogenesis in C3H/He mice.

Abstract:

:Liver tumors of certain strains of mice frequently contain mutations at codon 61 of the c-Ha-ras gene. In our study, we investigated the significance of these mutations in the carcinogenic process. Male C3H/He mice received a single injection of diethylnitrosamine (DEN) on day 15 after birth, and groups of animals were killed at various time intervals between 11 and 52 wk after treatment. At the earlier time points (11-29 wk), we analyzed microdissected tissue from precancerous glucose-6-phosphatase-deficient liver lesions larger than approximately 200 microns in diameter, for the presence and pattern of c-Ha-ras codon 61 mutations. In parallel, the growth characteristics of these liver lesions were studied by pulse labeling with [3H]thymidine and by determining the size distribution of the lesions. At the later time points (42-52 wk after DEN treatment), liver tumors were dissected and also analyzed for the presence of c-Ha-ras mutations. We found mutations to be already present in some of the enzyme-altered liver lesions at weeks 11-29, suggesting that the mutations occurred early in the carcinogenic process. Whereas about 10% of the precancerous focal liver lesions showed mutations in the c-Ha-ras gene, the mutation frequency was increased to about 50% in the later-appearing hepatocellular adenomas and carcinomas, suggesting that c-Ha-ras codon 61 mutations may provide a selective advantage to the mutated cell clones.

journal_name

Mol Carcinog

journal_title

Molecular carcinogenesis

authors

Bauer-Hofmann R,Klimek F,Buchmann A,Müller O,Bannasch P,Schwarz M

doi

10.1002/mc.2940060110

subject

Has Abstract

pub_date

1992-01-01 00:00:00

pages

60-7

issue

1

eissn

0899-1987

issn

1098-2744

journal_volume

6

pub_type

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