title: Establishment of human oral-cancer cell lines (KOSC-2 and -3) carrying p53 and c-myc abnormalities by geneticin treatment.
abstract: Two cultured cell lines derived from human squamous-cell carcinomas were established through xenografted tumors in nude mice by "Geneticin" treatment, which allows to eliminate contaminated mouse fibroblasts and obtain enriched tumor cells at the early stage of cultivation. Line KOSC-2 and KOSC-3 were each derived from a squamous-cell carcinoma of the oral floor and of the lower gingiva, respectively. Both lines grew in a cobblestone pattern, demonstrating their epithelial heritage. Giemsa-banding patterns by chromosome analysis confirmed that both lines are of human origin. Molecular analysis of cancer-related genes, including the Ha-ras, c-myc and p53 genes, was performed. KOSC-3 cells showed co-over-expression of p53 and c-myc mRNA, in addition to p53 point mutation at codon 248 with transition from CGG to TGG. However, loss of heterozygosity (LOH) on chromosome 17 was detected in both lines by Southern blotting. These cell lines provide a model for elucidating the mechanism involving p53 inactivation and c-myc-gene over-expression.
authors.affiliation: Second Department of Pathology, Kobe University School of Medicine, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Inagaki
authors.forename: S
authors.initials: S
authors.lastname: Matsuwari
authors.forename: R
authors.initials: R
authors.lastname: Takahashi
authors.forename: K
authors.initials: K
authors.lastname: Shimada
authors.forename: K
authors.initials: K
authors.lastname: Fujie
authors.forename: S
authors.initials: S
authors.lastname: Maeda
mesh_terms: D000368:Aged; D000818:Animals; D002294:Carcinoma, Squamous Cell / Q000235:genetics* / Q000473:pathology*; D002455:Cell Division / Q000502:physiology; D002869:Chromosome Aberrations; D004273:DNA, Neoplasm / Q000235:genetics; D005260:Female; D016259:Genes, myc / Q000235:genetics*; D016158:Genes, p53 / Q000235:genetics*; D005839:Gentamicins; D006801:Humans; D007621:Karyotyping; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D008819:Mice, Nude; D008875:Middle Aged; D009062:Mouth Neoplasms / Q000235:genetics* / Q000473:pathology*; D009368:Neoplasm Transplantation; D014183:Transplantation, Heterologous; D014407:Tumor Cells, Cultured
chemical_list: D004273:DNA, Neoplasm; D005839:Gentamicins; C010680:antibiotic G 418