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The Journal of Immunology, 2002, 168: 1095-1102.
Copyright © 2002 by The American Association of Immunologists

Withdrawal of Stimulation May Initiate the Transition of Effector to Memory CD4 Cells1

Judith Harbertson, Elana Biederman, Kristin E. Bennett, Robyn M. Kondrack and Linda M. Bradley2

Department of Immunology, The Scripps Research Institute, La Jolla, CA 92037

The initial steps that determine development of memory in CD4 cells are unknown. To distinguish an intrinsic capacity of effectors to become memory cells from contributions of as yet undefined survival factors, we analyzed the effects of withdrawal of signals via TCR, costimulation, and cytokines from Th1 or Th2 primary effectors induced in vitro from TCR-transgenic CD4 cells. Withdrawal of stimulation caused the transition of effectors to resting populations with a memory phenotype that did not undergo division following transfer to normal syngeneic recipients. The return of effectors to rest was accompanied by acquisition of the capacity to function as memory cells in vivo as defined by extended persistence and a more rapid response to Ag in vivo than naive cells in adoptive hosts. Upon challenge with Ag, these in vitro-rested Th1 and Th2 cells were similar to long-term in vivo-rested memory cells, but distinct from in vitro-generated primary effectors and in vivo-restimulated memory effectors by their ability to resist apoptosis. Cessation of stimulation may occur when activated CD4 cells exit lymphoid tissues after priming and transition to memory may be initiated if effectors either fail to gain access to Ag in peripheral tissues where restimulation can lead to activation-induced cell death or do not receive sufficient stimuli to continue a response. Our results suggest that the first stage leading to stable CD4 memory could occur stochastically and independently of instructional processes and as such, the development of memory may be a default pathway when signals that direct responses are not received.




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