Summary
A new interleukin-2(IL-2)-dependent T cell line, designated CS-IIA, was established by cocultivating normal human cord leukocytes and a lethally X-irradiated HTLV-II-producing simian leukocyte cell line (Si-IIA). CS-IIA showed CD4 dominance during the early culture. However, after addition of IL-2, CS-IIA predominantly co-expressed CD4 and CD8 (69.5%) and also expressed the surface markers CD1−, CD3+, CD19−, CD25+ and HLA-DR+. A significantly elevated level of IL-4 (1697 pg/ml) was observed in the culture supernatant from CS-IIA. In addition, the conversion of phenotype from some CD4+CD8+ cells to CD4+CD8− was demonstrated by the neutralization assay using anti-IL-4 antibody. CS-IIA had a normal human karyotype and was free from Epstein-Barr virus nuclear antigen and immunoreactive with sera of HTLV-I- or HTLV-II-infected patients and anti-HTLV-1, p19 or p24 mAb. The provirus genome of HTLV-II was detected in this cell line by the polymerase chain reaction combined with a digoxigenin-enzyme-linked immunosorbent assay. However, electron microscopy of CS-IIA cells revealed no C-type virus particles in the extracellular space. These results indicate that HTLV-II can be transmitted from an HTLV-II-infected simian leukocyte cell line to human cord T lymphocytes and suggest that co-expression of CD4 and CD8 on T cells may be induced by the high level of IL-4, which can mediate CD8 induction on CD4+ T cell clones.
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Abbreviations
- HTLV-II:
-
human-T-lymphotropic virus type II
- PCR:
-
polymerase chain reaction
- IL-2:
-
human interleukin-2
- IL-4:
-
human interleukin-4
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Hayashi, K., Ohara, N., Fujiwara, K. et al. Co-expression of CD4 and CD8 associated with elevated interleukin-4 in a cord T cell line derived by cocultivating normal cord leukocytes and an HTLV-II-producing simian leukocyte cell line (Si-IIA). J Cancer Res Clin Oncol 119, 137–141 (1993). https://doi.org/10.1007/BF01229527
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DOI: https://doi.org/10.1007/BF01229527