Early effector T cells producing significant IFN-γ develop into memory

J. Jeremiah Bell, Jason S. Ellis, F. Betul Guloglu, Danielle Tartar, Hyun Hee Lee, Rohit D. Divekar, Renu Jain, Ping Yu, Christine M. Hoeman, Habib Zaghouani

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


Currently, transition of T cells from effector to memory is believed to occur as a consequence of exposure to residual suboptimal Ag found in lymphoid tissues at the waning end of the effector phase and microbial clearance. This led to the interpretation that memory arises from slightly activated late effectors producing reduced amounts of IFN-γ. In this study, we show that CD4 T cells from the early stage of the effector phase in which both the Ag and activation are optimal also transit to memory. Moreover, early effector T cells that have undergone four divisions expressed significant IL-7R, produced IFN-γ, and yielded rapid and robust memory responses. Cells that divided three times that had marginal IL-7R expression and no IFN-γ raised base level homeostatic memory, whereas those that have undergone only two divisions and produced IFN-γ yielded conditioned memory despite low IL-7R expression. Thus, highly activated early effectors generated under short exposure to optimal Ag in vivo develop into memory, and such transition is dependent on a significant production of the cell's signature cytokine, IFN-γ.

Original languageEnglish (US)
Pages (from-to)179-187
Number of pages9
JournalJournal of Immunology
Issue number1
StatePublished - Jan 1 2008
Externally publishedYes

ASJC Scopus subject areas

  • Immunology


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