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Related Concept Videos

T Cell Types and Functions01:24

T Cell Types and Functions

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When T cells with CD4 markers are activated, they give rise to two types of effector cells: helper T cells and regulatory T cells. Meanwhile, T cells with CD8 markers differentiate into effector cytotoxic T cells. The differentiation of CD4 T cells into helper T cell subsets, such as Th1, Th2, and Th17 cells, is dependent on the antigen type, antigen-presenting cell, and regulatory cytokines.
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Cytotoxic T cells are a vital component of the immune system. They have the remarkable ability to identify and target antigens on infected or abnormal cells. These antigens often originate from intracellular pathogens such as viruses or abnormal proteins cancer cells produce.
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Immunological memory, a pivotal pillar of the adaptive immune system, is responsible for the body's ability to remember and respond more swiftly and effectively to previously encountered pathogens. This remarkable feature is what makes vaccines so effective in preventing diseases.
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B Cell Activation and Differentiation01:24

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The adaptive immune response, a sophisticated defense mechanism, relies on the activation and differentiation of B lymphocytes, or B cells. These processes enable our bodies to mount a tailored response against specific pathogens such as bacteria, free virus particles, toxins, and parasites.
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Related Experiment Video

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Murine Superficial Lymph Node Surgery
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Effector CD8 T cells dedifferentiate into long-lived memory cells.

Ben Youngblood1,2,3, J Scott Hale1,2, Haydn T Kissick4

  • 1Emory Vaccine Center, Emory University School of Medicine, Atlanta, Georgia 30322, USA.

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Long-lived memory CD8 T cells develop from a subset of effector T cells through a dedifferentiation process. This involves epigenetic reprogramming, where naive cell genes are re-expressed, enabling robust T cell immunity.

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Area of Science:

  • Immunology
  • Cellular Biology
  • Epigenetics

Background:

  • Long-lived memory CD8 T cells are crucial for adaptive immunity, providing rapid responses upon pathogen re-exposure.
  • The developmental origin of memory CD8 T cells, whether from naive or effector cells, has been a long-standing debate.
  • Memory CD8 T cells exhibit characteristics of both naive and effector cells, complicating their lineage determination.

Purpose of the Study:

  • To investigate the developmental origin of long-lived memory CD8 T cells.
  • To elucidate the epigenetic mechanisms governing the transition from effector to memory CD8 T cells.
  • To determine if memory CD8 T cells arise directly from naive cells or through a dedifferentiation process from effector cells.

Main Methods:

  • Analysis of DNA methylation patterns in virus-specific CD8 T cells during acute lymphocytic choriomeningitis virus infection in mice.
  • Comparison of epigenetic states between terminal effector and memory-precursor CD8 T cell subsets.
  • Conditional deletion of the de novo methyltransferase Dnmt3a to assess its role in memory cell development.
  • Longitudinal phenotypic and epigenetic characterization of transferred memory-precursor effector cells.

Main Results:

  • Memory CD8 T cells are derived from a subset of effector T cells via dedifferentiation, not directly from naive cells.
  • Memory cell development involves acquiring de novo DNA methylation at naive-associated genes and demethylation at effector molecule loci.
  • Conditional deletion of Dnmt3a accelerated memory cell development by reducing methylation and promoting re-expression of naive genes.
  • Differentiation to memory cells is associated with erasure of de novo methylation and re-expression of naive-associated genes.

Conclusions:

  • Long-lived memory CD8 T cells originate from a subset of fate-permissive effector T cells that undergo dedifferentiation.
  • Epigenetic reprogramming, specifically the reversal of epigenetic repression of naive-associated genes, is key to memory CD8 T cell formation.
  • This study demonstrates that memory CD8 T cells arise from effector cells through a process involving epigenetic plasticity.