Absence of p53 mutations in rat colon tumors induced by 2-amino-6-methyldipyrido[1,2-a:3',2'-d]imidazole, 2-amino-3-methylimidazo[4,5-f]quinoline, or 2-amino-1-methyl-6-phenylimidazo]4,5-b]pyridine.

Abstract

Colon tumors were induced in F344 rats by three heterocyclic amines (HCAs), 2-amino-6-methyl-dipyrido[1,2-a:3',2'-d]imidazole (Glu-P-1), 2-amino-3-methylimidazo[4,5-f]quinoline (IQ) or 2-amino-1-methyl-6-phenylimidazo[4,5-b]pyridine (PhIP), and examined for p53 mutations. Seven carcinomas induced by Glu-P-1, and nine carcinomas and two adenomas induced by IQ were examined by cDNA-polymerase chain reaction-single strand conformation polymorphism (PCR-SSCP) analysis from codon 103 to 391 of p53, which encompasses the conserved regions II to IV. Nine carcinomas induced by PhIP were examined by genomic PCR-SSCP analysis of exons 5 to 7 (from codon 124 to 304), which encompasses the 3' half of the conserved region II and all the conserved regions III-V. No band shifts were found in any of these tumors under at least two conditions of SSCP analysis. Our previous study had shown a Ki-ras mutation in only one Glu-P-1-induced adenocarcinoma among the same 27 colon tumors, and no other mutation of ras family genes had been found. HCA-induced rat colon tumors appear to represent a group of human colon tumors in which neither Ki-ras nor p53 is involved.

• Authors: H Makino, T Ushijima, H Kakiuchi, M Onda, N Ito, T Sugimura, M Nagao
• Journal: Japanese journal of cancer research : Gann (Jpn J Cancer Res) Vol. 85 Issue 5 Pg. 510-4 (May 1994) ISSN: 0910-5050 [Print] Japan
• PMID: 8014110 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Carcinogens
• Imidazoles
• Quinolines
• 2-amino-3-methylimidazo(4,5-f)quinoline
• 2-amino-6-methyldipyrido(1,2-a-3',2'-d)imidazole
• 2-amino-1-methyl-6-phenylimidazo(4,5-b)pyridine

Topics

• Adenocarcinoma (chemically induced, genetics)
• Adenoma (chemically induced, genetics)
• Animals
• Base Sequence
• Carcinogens
• Colonic Neoplasms (chemically induced, genetics)
• Genes, ras
• Imidazoles
• Male
• Molecular Sequence Data
• Mutation
• Polymerase Chain Reaction (methods)
• Quinolines
• Rats
• Rats, Inbred F344