A novel 26 kilodalton antigen expressed on the surface membrane of activated T cells

Ilan Bank, Yuri Bushkin, Alex Kritchevsky, Pnina Langevitz, Mazal Book, Boris Shenkman, Randle Ware, Leonard Chess

Research output: Contribution to journalArticlepeer-review


We have identified and characterized the tissue distribution of the antigen recognized by a novel monoclonal antibody (mAb) 1B10, raised against an activated γδ T cell clone. Immunohistochemistry of tissue sections, and analysis of single cell suspensions by flow cytometry revealed that mAb 1B10 weakly reacted with < 6% of normal human peripheral blood mononuclear sells (PBMC). After 5-6 days of in vitro culture of PBMC activated with phytohemagglutinin (PHA), 55% of the CD4+ and 25% of the CD8+ T cells became 1B10+. 1B10 expression was maintained on long term cultured interleukin 2 (IL-2)-dependent T cell receptor (TCR) αβ+ and γδ+ clones, and importantly, in contrast to resting T cells, the majority of in vivo activated synovial T lymphocytes from a patient with rheumatoid arthritis were 1B10+. In addition, myelo-monocytic U927 cells, tissue macrophages and some epithelia and fibroblasts were found to react with mAb 1B10. Sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) of molecules immuno-precipitated by mAb 1B10 from radio-iodinated cell surface membrane lysates of T lymphocyte and U937 cells revealed 26 and 29 kiloDalton (kDa) glycoproteins respectively. In conclusion, mAb 1B10 recognizes a novel late appearing 26 kDa T cell activation antigen that may be useful for further studies of activated T cells in health and disease.

Original languageEnglish
Pages (from-to)49-61
Number of pages13
Issue number1
StatePublished - Feb 1999


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