Antigen-experienced CD4 T cells display a reduced capacity for clonal expansion in vivo that is imposed by factors present in the immune host

Rebecca Merica, Alexander Khoruts, Kathryn A. Pape, R. Lee Reinhardt, Marc K. Jenkins

Research output: Contribution to journalArticle

54 Scopus citations

Abstract

It is thought that protective immunity is mediated in part by Ag- experienced T cells that respond more quickly and vigorously than naive T cells. Using adoptive transfer of OVA-specific CD4 T cells from TCR transgenic mice as a model system, we show that Ag-experienced CD4 T cells accumulate in lymph nodes more rapidly than naive T cells after in vivo challenge with Ag. However, the magnitude of clonal expansion by Ag- experienced T cells was much less than that of naive T cells, particularly at early times after primary immunization. Ag-experienced CD4 T cells quickly reverted to the slower but more robust clonal expansion behavior of naive T cells after transfer into a naive environment. Conversely, the capacity for rapid clonal expansion was acquired by naive CD4 T cells after transfer into passively immunized recipients. These results indicate that rapid in vivo response by Ag-experienced T cells is facilitated by Ag-specific Abs, whereas the limited capacity for clonal expansion is imposed by some other factor in the immune environment, perhaps residual Ag.

Original languageEnglish (US)
Pages (from-to)4551-4557
Number of pages7
JournalJournal of Immunology
Volume164
Issue number9
DOIs
StatePublished - May 1 2000

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