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Murine T Lymphocyte Clones with Distinct Immunological Functions

The study of cell-mediated immune responses has been facilitated by the development of model systems such as unidirectional mixed leukocyte culture (MLC) (Cerottini & Brunner 1974, Hayry et al. 1972, Wagner et al. 1973) which permit manipulation of the reacting cells in vitro. In most instances, the MLC is characterized by cell proliferation culminating in the development of cytolytic T lymphocytes (CTL) reactive toward the immunizing antigen. While antigenic stimulation induces cional expansion of reactive lymphocytes, the magnitude of the response is regulated by circuits of interacting T cell subsets exhibiting specific and/or non-specific helper or suppressor functions. Some of these interactions are mediated by soluble factors, others involve the expression of certain membrane proteins at the cell surface. Humoral responses are also characterized by the involvement of different cellular subsets which play diverse and highly specialized roles. Efforts to dissect the immune response and to characterize the nature of