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Antigen affinity, costimulation, andcytokine inputs sum linearly toamplify T cell expansion
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TLDR
It is reported that T cell receptor and costimulatory signals imprint an early, cell-intrinsic, division fate, whereby cells effectively count through generations before returning automatically to a quiescent state, and provides a quantitative paradigm for therapeutically manipulating immune response strength.Abstract:
Tcell responses are initiated by antigen and promoted by a range of costimulatory signals.
Understanding how Tcells integrate alternative signal combinations and make decisions
affecting immune response strength or tolerance poses a considerable theoretical challenge.
Here, we report that Tcell receptor (TCR) and costimulatory signals imprint an early,
cell-intrinsic, division fate,whereby cells effectively count through generations before returning
automatically to a quiescent state. This autonomous program can be extended by cytokines.
Signals from the TCR, costimulatory receptors, and cytokines add together using a linear
division calculus, allowing the strength of a Tcell response to be predicted from the sum of the
underlying signal components.These data resolve a long-standing costimulation paradox and
provide a quantitative paradigm for therapeutically manipulating immune response strength.read more
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References
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CD28-mediated signalling co-stimulates murine T cells and prevents induction of anergy in T-cell clones.
TL;DR: It is demonstrated that a monoclonal antibody against the murine homologue of CD28 can provide a co-stimulatory signal to naive CD4+ T cells and to T-cell clones and can block the induction of anergy in T- cell clones.
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Differential T cell costimulatory requirements in CD28-deficient mice
Arda Shahinian,Klaus Pfeffer,Kelvin P. Lee,Thomas M. Kündig,Kenji Kishihara,Andrew Wakeham,Kazuhiro Kawai,Pamela S. Ohashi,Craig B. Thompson,Tak W. Mak +9 more
TL;DR: CD28 is not required for all T cell responses in vivo, suggesting that alternative costimulatory pathways may exist.
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Memory CD8+ T cell differentiation: initial antigen encounter triggers a developmental program in naïve cells.
Susan M. Kaech,Rafi Ahmed +1 more
TL;DR: Data indicate that initial antigen encounter triggers an instructive developmental program that does not require further antigenic stimulation and does not cease until memory CD8+ T cell formation.
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The Biology of Interleukin-2
TL;DR: The current understanding of the dual role of IL-2 in maintaining tolerance and contributing to immunity in vivo is reviewed with some emphasis on T regulatory cell production and homeostasis.
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The interleukin-2 T-cell system: a new cell growth model.
TL;DR: Since the proliferative characteristics of T cells are identical to those of both prokaryotic and all other eukaryotic cells, these findings provide a new model that accounts fully for the variables that determine cell cycle progression.
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