Abstract
We have developed CD4+, tetanus antigen-specific T cell clones that proliferate in the presence of tetanus antigen and autologous irradiated peripheral blood leucocytes (PBL) as antigen-presenting cells (APC). There have been several reports that T cells can present antigen themselves. We have used tetanus antigen-specific T cell clones to examine the effects of envelope glycoproteins of HIV-1 on processing and presentation of antigen to T cells. Cloned T cells were pre-incubated with soluble crude preparation of tetanus antigen for 4 h at 37 degrees C, irradiated, and used as APC (T-APC). These cells could present antigen, as assessed by the ability of the autologous cloned T cells to proliferate. Resting T cells and phytohaemagglutinin-activated T cell blasts from autologous PBL could not present tetanus antigen to the responder cloned T cells. Antigen presentation by T-APC was abrogated by treating cells with anti-HLA-DR but not by anti-HLA-DQ monoclonal antibodies; treatment of tetanus antigen-pulsed T-APC with anti-tetanus antibody also blocked the ability of these cells to induce proliferation in responder T cells. Antigen presentation by cloned T cells was by a chloroquine-resistant pathway. Pretreatment of T-APC with envelope glycoprotein of HIV-1, gp120, did not affect the proliferative responses of the responder T cells. These data suggest that gp120 does not inhibit the antigen-presenting function while suppressing antigen-specific responses.
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Selected References
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