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Related Concept Videos

T Cell Activation and Clonal Selection01:22

T Cell Activation and Clonal Selection

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T cells are integral to our adaptive immune system, recognizing and effectively responding to foreign antigens. T cell activation and clonal selection are pivotal in orchestrating this immune response. This article elucidates these mechanisms, detailing the roles of cluster of differentiation (CD) markers, major histocompatibility complex (MHC) molecules, costimulatory signals, and the process of clonal selection.
Naive T cells that have not yet encountered an antigen express two primary CD...
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Cytotoxic T Cells-mediated Immune Response01:27

Cytotoxic T Cells-mediated Immune Response

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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.
Immunological surveillance is the ability of immune cells to monitor and eliminate infected cells with intracellular pathogens, neoplastically transformed cells, and cells with non-self antigens. Cytotoxic T cells and NK...
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Related Experiment Video

Updated: May 3, 2026

Real Time Detection of In Vitro Tumor Cell Apoptosis Induced by CD8+ T Cells to Study Immune Suppressive Functions of Tumor-infiltrating Myeloid Cells
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Real Time Detection of In Vitro Tumor Cell Apoptosis Induced by CD8+ T Cells to Study Immune Suppressive Functions of Tumor-infiltrating Myeloid Cells

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Attrition of memory CD8 T cells.

Raymond M Welsh1, Liisa K Selin

  • 1Department of Pathology, University of Massachusetts Medical School, Worcester, Massachusetts 01605, USA. raymond.welsh@umassmed.edu

Nature
|June 5, 2009
PubMed
Summary

Repeated immunizations can boost memory CD8 T cells without harming existing memory cells. However, multiple infections can decrease the total number of memory T cells, impacting future vaccination strategies.

Area of Science:

  • Immunology
  • Vaccinology

Background:

  • Maintaining immunological memory is crucial for lifelong protection against pathogens.
  • CD8 T cells play a vital role in adaptive immunity and immunological memory.
  • Existing research presents conflicting findings on the impact of repeated immunizations on memory T cell populations.

Discussion:

  • Vezys et al. observed that repeated immunizations can increase memory CD8 T cells without depleting pre-existing memory cells.
  • This contrasts with earlier findings suggesting a loss of CD8 memory cells after serial infections.
  • The discrepancy may stem from reporting memory cell loss as a percentage versus total cell number.

Key Insights:

  • This study demonstrates that specific immunization protocols can expand memory CD8 T cells without compromising other memory populations.

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Measuring Mitochondrial Function of Naïve and Effector CD8 T Cells
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Last Updated: May 3, 2026

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  • Re-analysis of historical data, presented as total cell numbers, confirms that serial infections can reduce the overall pool of memory T cells.
  • The findings highlight the importance of considering the total number, not just the proportion, of memory cells in immune responses.

    • Outlook:

    • These findings have significant implications for designing effective vaccination strategies.
    • Future vaccine development should aim to maximize beneficial memory cell expansion while mitigating potential depletion.
    • Further research is needed to fully understand the dynamics of memory cell populations under various immunological challenges.