title: Genetic alterations of p53 and ras genes in 1,3-butadiene- and 2',3'-dideoxycytidine-induced lymphomas.
abstract: Mutations of p53 and ras genes were analyzed in 40 and 31 1,3-butadiene (BD)-induced lymphomas of B6C3F1 mice (BLFs), respectively, and in 63 2',3'-dideoxycytidine-induced lymphomas, which were collected from B6C3F1 (n = 16) or NIH Swiss mice (DLSs; n = 47). The frequencies of K- and N-ras mutations in BLFs (32 and 13%, respectively) were higher than those in DLSs (13 and 2%, respectively). Seven of 10 K-ras-mutated BLFs contained codon 13 CGC mutations, whereas no mutation in K-ras codon 13 was detected in DLSs, suggesting that the codon 13 CGC mutation is specific for BD exposure. Interestingly, 8 of 13 BLFs with ras mutations were from low-dose (< or = 200 ppm) or stop-exposure (26 weeks) groups. These results suggest that ras mutations play an important role in the development of BD-induced lymphoma and may represent an early event. Analysis of genetic alterations in exons 5-8 of the p53 gene revealed mutations in seven of the BLFs and three of the DLSs. All seven BLFs carrying p53 mutations were collected from the high-dose (625 ppm) continuous exposure group, which might indicate that p53 is involved in the progression of BD-induced lymphoma and in late stage of lymphomagenesis. Mutations in ras and p53 genes are relatively infrequent in 2',3'-dideoxycytidine-induced lymphomas, suggesting that other genes must be involved.
authors.affiliation: Department of Cell Biology, Faculty of Health Sciences, University Hospital, Linköping University, Sweden.
authors.forename: S M
authors.initials: SM
authors.lastname: Zhuang
authors.forename: C
authors.initials: C
authors.lastname: Cochran
authors.forename: T
authors.initials: T
authors.lastname: Goodrow
authors.forename: R W
authors.initials: RW
authors.lastname: Wiseman
authors.forename: P
authors.initials: P
authors.lastname: Söderkvist
mesh_terms: D000818:Animals; D015139:Blotting, Southern; D002070:Butadienes; D002273:Carcinogens; D016158:Genes, p53 / Q000235:genetics*; D011905:Genes, ras / Q000235:genetics*; D016399:Lymphoma, T-Cell / Q000139:chemically induced / Q000235:genetics*; D051379:Mice; D008809:Mice, Inbred C3H; D008810:Mice, Inbred C57BL; D018807:Polymorphism, Single-Stranded Conformational; D016047:Zalcitabine
chemical_list: D002070:Butadienes; D002273:Carcinogens; D016047:Zalcitabine; C031763:1,3-butadiene