title: p53 mutation and absence of mdm2 amplification and Ki-ras mutation in 4-hydroxyamino quinoline 1-oxide induced transplantable osteosarcomas in rats.
abstract: Previously, we reported the establishment of two transplantable osteosarcomas, one induced by local application of a carcinogen, 4-hydroxyamino quinoline 1-oxide(4-HAQO), and another which developed spontaneously in rats, and their subdivision into four lines with high and low metastatic potential to the lung. In the present study, mutations of p53 and Ki-ras genes were investigated by PCR and SSCP followed by direct sequencing, and the amplification of the mdm2 gene was assessed by Southern blot analysis. Mutations of p53 in exon 7 were detected in 4-HAQO-induced transplantable osteosarcomas, but not their spontaneous counterparts, irrespective of the metastatic potentials. Direct sequencing revealed a CGC to CAC transition with an amino acid change of Arg to His, at codon 246. Neither Ki-ras mutations nor mdm2 amplification were detected in any of the transplantable tumors. The results suggest that while p53 mutations occurred during osteosarcoma development by 4-HAQO without mdm2 amplification and Ki-ras mutation does not contribute to osteosarcoma development in rats.
authors.affiliation: Department of Oncological Pathology, Cancer Center, Nara Medical University, Shijo-cho, Kashihara, Japan.
authors.forename: A
authors.initials: A
authors.lastname: Kido
authors.forename: T
authors.initials: T
authors.lastname: Tsujiuchi
authors.forename: M
authors.initials: M
authors.lastname: Tsutsumi
authors.forename: M
authors.initials: M
authors.lastname: Takahama
authors.forename: E
authors.initials: E
authors.lastname: Okajima
authors.forename: K
authors.initials: K
authors.lastname: Kobitsu
authors.forename: Y
authors.initials: Y
authors.lastname: Miyauchi
authors.forename: Y
authors.initials: Y
authors.lastname: Mii
authors.forename: S
authors.initials: S
authors.lastname: Tamai
authors.forename: Y
authors.initials: Y
authors.lastname: Konishi
mesh_terms: D015108:4-Hydroxyaminoquinoline-1-oxide; D000818:Animals; D001859:Bone Neoplasms / Q000139:chemically induced / Q000235:genetics*; D002273:Carcinogens; D005784:Gene Amplification; D011905:Genes, ras / Q000235:genetics*; D009363:Neoplasm Proteins / Q000235:genetics*; D009687:Nuclear Proteins; D012516:Osteosarcoma / Q000139:chemically induced / Q000235:genetics*; D018807:Polymorphism, Single-Stranded Conformational; D011518:Proto-Oncogene Proteins / Q000235:genetics*; D051736:Proto-Oncogene Proteins c-mdm2; D051381:Rats; D014407:Tumor Cells, Cultured
chemical_list: D002273:Carcinogens; D009363:Neoplasm Proteins; D009687:Nuclear Proteins; D011518:Proto-Oncogene Proteins; D015108:4-Hydroxyaminoquinoline-1-oxide; C497208:Mdm2 protein, rat; D051736:Proto-Oncogene Proteins c-mdm2