Cutting edge: effector memory CD8+ T cells in the lung airways retain the potential to mediate recall responses

KH Ely, AD Roberts, DL Woodland - The Journal of Immunology, 2003 - journals.aai.org
KH Ely, AD Roberts, DL Woodland
The Journal of Immunology, 2003journals.aai.org
Previous studies have shown that long-lived memory CD8+ T cells persist in the lung
airways following the resolution of a murine Sendai virus infection. These cells are CD11a
low, noncytolytic, and do not proliferate in the lung airways raising the possibility that they
are “end stage” or terminally differentiated memory cells. In this current report, we
investigated the functional characteristics of these cells by analyzing their capacity to
respond to secondary viral infection outside of the lung environment. We show that, after …
Abstract
Previous studies have shown that long-lived memory CD8+ T cells persist in the lung airways following the resolution of a murine Sendai virus infection. These cells are CD11a low, noncytolytic, and do not proliferate in the lung airways raising the possibility that they are “end stage” or terminally differentiated memory cells. In this current report, we investigated the functional characteristics of these cells by analyzing their capacity to respond to secondary viral infection outside of the lung environment. We show that, after transfer into the bloodstream, CD11a low memory T cells from the lung airways can return to the secondary lymphoid tissue and respond to a secondary viral challenge. Furthermore, these cells re-express CD11a, which may contribute to their migratory and proliferative capacity. These data demonstrate that lung airway memory CD8+ T cells are not terminally differentiated cells and retain the capacity to mediate recall responses to infection.
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