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Establishment and Characterization of a Human T‐Lymphocyte Cell Line Immortalized by SV40 and with Abnormal Expression of TCR/CD3

Human lymphocytes derived from the peripheral blood of a healthy woman were transfected with a plasmid carrying the simian virus 40 (SV40) large T antigen. The successfully transformed cells contained SV40 large T DNA and were negative for Epstein–Barr virus (EBV) and human T‐cell leukaemia virus (HTLV)‐1 genomes. The immortalized cell line was assigned to the T‐lymphocyte lineage on the basis of morphological, immunological and cytochemical criteria. While the cells expressed CD1a and CD4 at the cell surface, the CD3 complex was solely intracytoplasmic. Immunoprecipitation studies indicated that these cells lacked T‐cell receptor (TCR) α‐chains but not β‐chains. They were negative for activation markers such as CD25, CD69 and major histocompatibility (MHC) class II molecules. In addition, the transformed cells exhibited a complete growth independency towards interleukin‐2 (IL‐2). However, after phorbol ester stimulation, CD25 and CD69 markers were expressed and IL‐2 was secreted. This new human immortalized T‐lymphocytic cell line, which is cell‐surface TCR/CD3‐negative, may be useful as an in vitro model for studying TCR/CD3 assembly, expression and signal transduction.