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Related Concept Videos

Multipotency of Hematopoietic Stem Cells01:19

Multipotency of Hematopoietic Stem Cells

The hematopoietic stem cells or HSCs are multipotent, meaning they can differentiate and give rise to all blood and immune cells. HSCs are maintained in the quiescent stage until an external stimulus initiates their differentiation. The multipotent HSCs exist as two heterogeneous populations, long-term repopulating cells (LTRC) and short-term repopulating cells (STRC). The two HSC populations have different surface markers or receptors and are classified based on quiescence and long-term...
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CD8 T cell quiescence revisited.

Sara E Hamilton1, Stephen C Jameson

  • 1Center for Immunology, Department of Laboratory Medicine and Pathology, University of Minnesota, 2101 6th Street SE, Minneapolis, MN 55414, USA. hamil062@umn.edu

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|February 25, 2012
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Naïve and memory T cells exhibit greater flexibility in their quiescent states than previously understood. Research reveals active enforcement of T cell quiescence and instructed states, challenging traditional views.

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Area of Science:

  • Immunology
  • Cellular Biology
  • T cell biology

Background:

  • Naïve T cells are traditionally viewed as quiescent, while memory T cells are considered to be in a proliferative state.
  • Recent findings suggest T cell quiescence is actively maintained and that heterogeneity exists within naïve T cell populations.
  • Memory T cell activity may require specific instructions, such as interaction with dendritic cells, to prevent quiescence.

Purpose of the Study:

  • To discuss emerging evidence on the dynamic nature of T cell quiescence.
  • To explore the factors influencing the transition of T cells into and out of quiescent states.
  • To propose a revised understanding of T cell flexibility regarding quiescence.

Main Methods:

  • Review of recent immunological and cellular biology research.
  • Analysis of studies investigating T cell activation, proliferation, and quiescence.
  • Synthesis of findings on T cell heterogeneity and homeostatic regulation.

Main Results:

  • Naïve T cell quiescence is actively enforced, not a default state.
  • Heterogeneity within naïve T cells impacts their ability to exit quiescence.
  • Memory T cell active states may be instructed and require external cues to avoid reversion to quiescence.

Conclusions:

  • The quiescent state of both naïve and memory T cells is more flexible than previously assumed.
  • Active mechanisms regulate T cell quiescence and exit from it.
  • This revised perspective impacts our understanding of T cell homeostasis and immune responses.