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Diversity of Cytokine Synthesis and Function of Mouse CD4+ T Cells

The immune response is capable of invoking a variety of difTerent effector mechanisms, each of which is particularly effective against a certain set of pathogens. The regulation of the type of effector mechanisms chosen during an immune response is of critical importance to the host, and thus it is not surprising that this aspect of the immune system is subject to precise and complex regulation. Over the past few years, it has become clear that subsets of T cells secreting distinct patterns of cytokines have a major role in the regulation of the effector functions induced against a particular infectious agent. Two major patterns of cytokine synthesis were initially recognized, and these two patterns appear to correlate with the induction of delayed-type hypersensitivity (DTH) and help for antibody synthesis, thus providing a possible explanation for the separate and often reciprocal regulation of these two responses. Recent information suggests that additional cytokine secretion phenotypes exist, and that there is extensive regulation of the differentiation and effector function of the various cell types.