title: Isolation of variant cells from SV-40 transformed human diploid fibroblasts.
abstract: Variant cell lines that are sensitive to density-dependent inhibition of growth have been isolated from three of four SV40-transformed human fibroblast cell lines. Variants were isolated by plating the transformed cells at low density, by treating them with 5-fluorodeoxyuridine, or by growing them on glutaraldehyde-fixed monolayers of normal cells. The variant cell lines, isolated at a frequency of about 2% of all cells forming colonies after treatment, were initially recognized by colonial morphology, and the variant pheno-types were confirmed, after subculturing, by saturation-density determinations. The variant cell lines reach saturation densities that are 40% or less than those of the parent cell lines, and plate in soft agar medium at reduced efficiency, compared with the parent cells. They retain SV40 T antigen. The modal chromosome numbers of two of the variant cell lines were increased, compared with those of the parent cell lines; two other variants were indistinguishable in chromosome number from the parent cells. Stability of these properties over a 6-month period was demonstrated with two of the variants.
mesh_terms: D002460:Cell Line; D002471:Cell Transformation, Neoplastic; D002869:Chromosome Aberrations; D003260:Contact Inhibition; D005347:Fibroblasts / Q000502:physiology; D005472:Fluorouracil / Q000494:pharmacology; D005976:Glutaral / Q000494:pharmacology; D006801:Humans; D013539:Simian virus 40
chemical_list: D005976:Glutaral; D005472:Fluorouracil