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Related Concept Videos

T Cell Activation and Clonal Selection01:22

T Cell Activation and Clonal Selection

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.
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Cells of the Adaptive Immune Response01:23

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The T and B lymphocytes of the adaptive immune system develop from common lymphoid progenitor cells in the bone marrow. These progenitors give rise to precursors that eventually develop into both T and B lymphocytes. As these precursors mature, they gain the ability to detect and respond to foreign antigens in the body, a process known as immunocompetence. Additionally, these precursors acquire self-tolerance, a process that ensures they do not react to self-antigens. This intricate system...
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Real-Time In Vitro Migration Assay for Primary Murine CD8+ T Cells
06:42

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Published on: May 24, 2024

Different patterns of peripheral migration by memory CD4+ and CD8+ T cells.

Thomas Gebhardt1, Paul G Whitney, Ali Zaid

  • 1Department of Microbiology and Immunology, The University of Melbourne, Melbourne, Victoria 3010, Australia. gebhardt@unimelb.edu.au

Nature
|August 16, 2011
PubMed
Summary

Memory CD4(+) and CD8(+) T cells exhibit distinct migration patterns after skin infection. CD8(+) T cells remain localized, while CD4(+) T cells recirculate, impacting peripheral immunosurveillance and local immunity.

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Imaging CD4 T Cell Interstitial Migration in the Inflamed Dermis
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Area of Science:

  • Immunology
  • Cellular Biology
  • Virology

Background:

  • Peripheral tissue infections prime T-cell responses for pathogen control.
  • Memory T cells, including migrating and resident populations, are crucial for long-term immunity at pathogen entry sites.
  • Distinct programming requirements exist for CD4(+) helper and CD8(+) killer T cells.

Purpose of the Study:

  • To investigate differences in migration and tissue localization between memory CD4(+) and CD8(+) T cells after skin infection.
  • To explore the roles of these subsets in peripheral immunosurveillance and local infection control.

Main Methods:

  • Utilized a mouse model to study T-cell responses following herpes simplex virus skin infection.
  • Analyzed the migration patterns and tissue localization of virus-specific memory CD4(+) and CD8(+) T cells post-infection.
  • Examined homing-molecule expression on T-cell subsets.

Main Results:

  • Identified two distinct memory T-cell subsets in the skin post-infection: sequestered, resident CD8(+) T cells in the epidermis and dynamic, recirculating CD4(+) T cells in the dermis.
  • Observed that CD8(+) T cells were largely confined to the original infection site.
  • Demonstrated that CD4(+) T cells trafficked rapidly through the dermis, indicating a wider recirculation pattern.
  • Noted unique homing-molecule expression on CD4(+) T effector-memory cells correlating with their migratory capacity.

Conclusions:

  • Highlighted significant differences in the migration and tissue localization of memory CD4(+) and CD8(+) T cells.
  • Revealed a complexity in memory T-cell migration previously unappreciated.
  • Suggested distinct functional roles for CD4(+) and CD8(+) T cells in peripheral immunity based on their migratory behavior.