Essential requirement of antigen presentation by monocyte lineage cells for the activation of primary human gamma delta T cells by aminobisphosphonate antigen

The Journal of Immunology : Official Journal of the American Association of Immunologists
F MiyagawaN Minato

Abstract

Human gammadelta T cells respond to nonpeptide Ags such as pyrophosphomonoesters and alkylamines in a gammadelta TCR-dependent manner in the absence of other APCS: Recently, aminobisphosphonates such as pamidronate have also been shown to activate human gammadelta T cells. In the present study, we indicate that activation of primary gammadelta T cells by pamidronate strictly depends on the presence of monocyte-lineage cells, unlike that by pyrophosphomonoesters. Thus, although pamidronate induced cell clustering, proliferation, and IFN-gamma production of gammadelta T cells in the culture of PBMC, it failed to induce any of these activities in the culture of purified primary gammadelta T cells. By adding back the purified monocytes, however, both cell clustering and IFN-gamma production of gammadelta T cells by pamidronate could be restored. The pamidronate-pulsed, but not untreated, myelomonocytic line, THP-1, was capable of activating the purified gammadelta T cells to produce IFN-gamma, which was associated with the down-regulation of gammadelta TCR. Furthermore, pamidronate-pulsed THP-1 cells were significantly more susceptible to gammadelta T cell-mediated cytotoxicity than untreated THP-1. Also, TCR-defective Jurkat T cel...Continue Reading

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