Cutting edge: local recall responses by memory T cells newly recruited to peripheral nonlymphoid tissues

LM Wakim, T Gebhardt, WR Heath… - The Journal of …, 2008 - journals.aai.org
LM Wakim, T Gebhardt, WR Heath, FR Carbone
The Journal of Immunology, 2008journals.aai.org
Infection results in the formation of a circulating effector memory T cell population able to
enter peripheral tissues either in the steady state or in response to localized infection. As a
consequence, recall is thought to result from a phased response first involving those T cells
already at the site of infection followed by the infiltration of memory cells from the wider
circulation. We have recently reported that tissue-resident T cells can undergo stimulation
and proliferation in response to local infection. In this study, we examine the proliferation of …
Abstract
Infection results in the formation of a circulating effector memory T cell population able to enter peripheral tissues either in the steady state or in response to localized infection. As a consequence, recall is thought to result from a phased response first involving those T cells already at the site of infection followed by the infiltration of memory cells from the wider circulation. We have recently reported that tissue-resident T cells can undergo stimulation and proliferation in response to local infection. In this study, we examine the proliferation of memory T cells newly recruited from the circulation. Our results show that although recruitment of circulating memory cells is nonspecific in nature, there is preferential proliferation of specific T cells within infected tissues. Thus, expansion represents a means of local Ag-specific enrichment of T cells recruited from a circulating memory pool of mixed specificities.
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