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Analysis of Antigen Reactive T-Cells

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Because antigen-specific cells are the central coordinators of the immune response to infectious organisms, and the principal effector cells in autoimmune disease, there are many circumstances in which investigators may wish to examine the T-cell responses to particular antigens. This chapter outlines techniques for assessing the responses of polyclonal populations of T-lymphocytes by measuring a variety of outputs each of which gives different kinds of information about the response. The outputs discussed are proliferation and cytokine production, with methods for measuring cytokine secretion by the whole population together with techniques for making an estimate of the numbers of cells producing a cytokine in response to antigen, and examining the phenotype of the responsive cells.
In many cases detailed information about responses to particular antigens requires the isolation and characterization of antigen-responsive T-cell clones, and this is also described together with methods of identifying unknown antigens by screening recombinant expression libraries. Lastly, because the techniques differ in many respects, methods for isolating antigen-specific CD8+ T-cells, particularly those which recognize bacteria, are also included.
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