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*
Center for Immunology, Departments of
Biochemistry, Molecular Biology, and Biophysics and
Laboratory Medicine and Pathology, University of Minnesota, Minneapolis, MN 55455
CD8 T cells undergo autocrine IL-2-dependent proliferation
upon TCR engagement and costimulation, but within 34 days, they
become activation-induced nonresponsive (AINR) and display a split
anergy. They can lyse targets and secrete IFN-
but they cannot
produce IL-2 in response to TCR ligation and costimulation, due at
least in part to an inability to up-regulate mitogen-activated protein
kinases and IL-2 mRNA. Exogenous IL-2 can drive continued proliferation
of AINR cells and nonresponsiveness is reversed within 12 days so
that Ag-driven proliferation can resume. Mitogen-activated protein
kinases and IL-2 mRNA can again be up-regulated, but "rewiring" has
occurred so that these events no longer depend upon costimulation; TCR
engagement is sufficient. Development of AINR appears to be a normal
part of the differentiation program of CD8 T cells, providing a
regulatory checkpoint to convert the initial helper-independent
response to one that depends upon CD4 T cell help for continued
expansion of the effector CTL. Once permission is given, in the form of
IL-2, to pass this checkpoint, the CTL can make a prolonged response to
persisting Ag in the absence of further CD4 T cell
help.
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