Comparison of transformation and T antigen induction in human cell lines.

Skin fibroblast cultures were established from eight individuals. These cell cultures, together with WI-38 cells, were examined for susceptibility to transformation by SV40 virus. Four transformation-susceptible cell lines (TS), established from patients with Down's syndrome, were found to be three to four times more susceptible to transformation than transformation-resistant cell lines (TR) from normal individuals. TR and TS cell lines were compared for their susceptibility to induction of SV40 T antigen. For dividing cells T antigen was detected in a higher percentage of TS cells than TR cells. For nondividing cells, the reverse was found; T antigen was detected in 10-fold more cells of the TR lines than in cells of the TS lines. Similar results were obtained after infection of cells with CELO virus. Titration of vaccinia virus and influenza virus A2/Scotland/49/57 indicated that TR and TS cells were equally sensitive to the former virus, but TR cells were three to five times more sensitive to influenza virus A2/Scotland/49/57 than were TS cells.