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- W1647115901 abstract "Abstract To examine the functional characteristics of memory CD4+ T cells, we used an adoptive transfer system to generate a stable population of Ag-specific memory cells in vivo and compared their responses to Ag with those of a similar population of Ag-specific naive cells. Memory cells localized to the spleen and lymph nodes of mice and exhibited extremely rapid recall responses to Ag in vivo, leaving the spleen within 3–5 days of Ag encounter. Unlike their naive counterparts, memory cells produced effector cytokines (IFN-γ, IL-4, IL-5) within 12–24 h of Ag exposure and did not require multiple cycles of cell division to do so. Memory cells proliferated at lower Ag concentrations than did naive cells, were less dependent on costimulation by B7 molecules, and independent of costimulation by CD40. Furthermore, effector cytokine production by memory cells also occurred in the absence of either B7 or CD40 costimulation. Lastly, memory cells were resistant to tolerance induction. Together, these findings suggest that the threshold for activation of memory CD4+ cells is lower than that of naive cells. This would permit memory cells to rapidly express their effector functions in vivo earlier in the course of a secondary immune response, when the levels of Ag and the availability of costimulation may be relatively low." @default.
- W1647115901 created "2016-06-24" @default.
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- W1647115901 date "2000-01-01" @default.
- W1647115901 modified "2023-10-16" @default.
- W1647115901 title "Functional Responses and Costimulator Dependence of Memory CD4+ T Cells" @default.
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- W1647115901 doi "https://doi.org/10.4049/jimmunol.164.1.265" @default.
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