Abstract
Requirements for antigen presentation for in vitro stimulation of two subpopulations of Td lymphocytes were investigated. One subset was K,D-region-restricted and required infection or fusion of virus particles with stimulator cells for induction. The other subpopulation was I-region-restricted and required presentation of antigen by adherent cells (presumably macrophages). Presentation of antigen on Ia antigen positive stimulator cells (LPS blasts) failed to lead to stimulation of I-region-restricted T lymphocytes, thus suggesting that phagoctyosis and processing of antigen rather than association of viral antigens via fusion or infection was required for stimulation of these T lymphocytes.
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