title: Cellular characteristics of Chinese hamster cell mutants resembling ataxia telangiectasia cells.
abstract: The radiosensitive Chinese hamster V79 cell mutants (V-C4, V-E5 and V-G8), isolated previously in our laboratory, have been shown to resemble human ataxia telangiectasia (A-T) cells. These hamster cell mutants were further characterized with respect to cross-sensitivity to different radiomimetic agents and to mutation induction by X-rays. The data on cell survival (D10 values) show that they are hypersensitive to adriamycin (2-3-fold increase), etoposide (3-fold for V-G8 and 6-fold for V-E5 and V-C4), calicheamicin gamma 1I (4-fold) and streptonigrin (3-fold for V-G8 and V-C4, and 12-fold for V-E5). The frequency of X-ray-induced hprt mutations is slightly enhanced in the hamster mutant cells treated with the same dose. However, the mutants show similar mutability as parental V79 cells when considering the same survival level. The overall conclusion from these studies is that these hamster cell mutants mimic the phenotypic characteristics observed in cultured cells from A-T patients and, therefore, may be defective in the same repair pathway as their human counterparts.
authors.affiliation: MGC-Department of Radiation Genetics and Chemical Mutagenesis, State University of Leiden, The Netherlands.
authors.forename: W
authors.initials: W
authors.lastname: Jongmans
authors.forename: G W
authors.initials: GW
authors.lastname: Verhaegh
authors.forename: K
authors.initials: K
authors.lastname: Sankaranarayanan
authors.forename: P H
authors.initials: PH
authors.lastname: Lohman
authors.forename: M Z
authors.initials: MZ
authors.lastname: Zdzienicka
mesh_terms: D000617:Aminoglycosides; D000818:Animals; D000900:Anti-Bacterial Agents / Q000494:pharmacology; D001260:Ataxia Telangiectasia / Q000235:genetics / Q000473:pathology*; D002460:Cell Line / Q000187:drug effects / Q000528:radiation effects; D002470:Cell Survival / Q000187:drug effects / Q000528:radiation effects; D006224:Cricetinae; D004317:Doxorubicin / Q000494:pharmacology; D053281:Enediynes; D005047:Etoposide / Q000494:pharmacology; D006801:Humans; D007041:Hypoxanthine Phosphoribosyltransferase / Q000235:genetics; D009153:Mutagens / Q000494:pharmacology; D009154:Mutation; D013308:Streptonigrin / Q000494:pharmacology
chemical_list: D000617:Aminoglycosides; D000900:Anti-Bacterial Agents; D053281:Enediynes; D009153:Mutagens; C055955:calicheamicin gamma(1)I; D013308:Streptonigrin; D005047:Etoposide; D004317:Doxorubicin; D007041:Hypoxanthine Phosphoribosyltransferase