Abstract
Hapten- and protein-antigen-specific T helper cells are usually expanded in vitro from lymphocytes obtained from sensitized animals. In this paper we report on the primary activation and proliferation in vitro of T helper cells from nonsensitized animals by using syngeneic cultured epidermal Langerhans cells as a source of potent antigen-presenting cells. The primary in vitro proliferation was blocked with monoclonal antibodies to Ia molecules, to lymphocyte function-associated antigen 1 (LFA-1), and to L3T4. T helper cell populations sensitized in vitro to haptens and protein antigens showed hapten- and antigen-specific proliferation when restimulated in vitro with spleen cells. Besides its experimental usefulness, in vitro generation of syngeneic specific T helper cells may afford possibilities for adoptive immunotherapy.
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Selected References
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