Abstract
AbstractThe properties of hamster cells containing SV40 tumor (T) antigen in the cytoplasm, rather than the nucleus, were determined. Eight cell lines were established from eight tumors induced by hamster embryo fibroblasts transformed in vitro by PARA (2cT)‐adenovirus 7. Six cell lines contained only cytoplasmic SV40 T‐positive cells while two were a mixture of nuclear T‐positive and cytoplasmic T‐positive cells. All the cell lines contained SV40 S antigen, all caused the production of SV40 T antibody in vivo, and four elicited the production of adenovirus T antibody. The cell lines seem to have acquired an infinite life span in vitro. The localization of T antigen apparently can be a stable phenomenon because five of the cell lines have retained T antigen exclusively in the cytoplasm for over 40 passages in tissue culture. The cytoplasmic T antigen could be detected by complement fixation in addition to immunofluorescence. Cytoplasmic T‐positive cells were readily transplantable in vivo and contained SV40 TSTA demonstrable by both immunogenicity and immunosensitivity procedures. Two of the three cytoplasmic variants of PARA appear to be weakly oncogenic in newborn hamsters.
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