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Costimulatory Molecule Requirement for Bovine WC1 + γδ T Cells' Proliferative Response to Bacterial Superantigens
Author(s) -
Fikri Y.,
Pastoret P.P.,
Nyabenda J.
Publication year - 2002
Publication title -
scandinavian journal of immunology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.934
H-Index - 88
eISSN - 1365-3083
pISSN - 0300-9475
DOI - 10.1046/j.1365-3083.2002.01069.x
Subject(s) - cd86 , cd80 , superantigen , antigen presenting cell , t cell , cd40 , major histocompatibility complex , biology , antigen , concanavalin a , antigen presentation , microbiology and biotechnology , cytotoxic t cell , immunology , immune system , in vitro , biochemistry
We have previously shown that the proliferation of freshly isolated bovine WC1 + γδ T cells to superantigens (SAgs) including staphylococcal enterotoxin A (SEA), and staphylococcal enterotoxin B (SEB) or toxic shock syndrome type‐1 (TSST‐1) required the presence of antigen‐presenting cells (APC) and the addition of exogenous interleukin (IL)‐2. The costimulatory activity provided by molecules expressed on professional APC for the proliferation of γδ T cells has not been addressed hitherto. In the present study, we investigated the ability of two selected APC populations, the dendritic cells (DCs) highly expressing CD80 and CD86 molecules (CD80 high CD86 high ) and the monocytes expressing the same molecules at a rather low level (CD80 low CD86 low ), to stimulate the proliferation of purified bovine WC1 + γδ T cells to SAgs. DCs were more efficient than monocytes in inducing γδ T‐cell proliferation, and this response was dependent on exogenous IL‐2 in both presentation modes. Stimulating γδ T cells with gradual doses of SAgs or concanavalin A (ConA) resulted in similar dose‐dependent reaction profiles suggesting a minimal role of the major histocompatibility complex (MHC). However, significant proliferation was already obtained with the starting doses in the presence of DC compared with monocytes, and higher proliferation was reached with DC at optimal doses. Finally, the addition of monoclonal antibody (MoAb) anti‐CD86 markedly inhibited SAgs‐ and ConA‐mediated proliferation, whereas MoAb anti‐CD80 had no effect. The combination of both anti‐CD80 and anti‐CD86, however, suppressed this response. These results suggest that bovine γδ T‐cell proliferation response requires indubitably CD86 costimulation. The role of CD80 molecule seems less clear.