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Related Concept Videos

Cells of the Adaptive Immune Response01:23

Cells of the Adaptive Immune Response

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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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T Cell Activation and Clonal Selection01:22

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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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Clone tracking through repeated malaria identifies high-fidelity memory CD4 T cell responses.

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  • 1Department of Medicine, Stanford University, Stanford, CA, USA.

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This study reveals that human CD4+ T cells maintain stable subsets, a phenomenon called clonal fidelity, during repeated malaria infections. Type 1 regulatory T cells show remarkable long-term memory potential after Plasmodium falciparum exposure.

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Area of Science:

  • Immunology
  • Infectious Diseases
  • Cellular Biology

Background:

  • Understanding T cell responses during repeated infections is crucial for vaccine development.
  • Few studies have longitudinally tracked human CD4+ T cell clones through multiple infection cycles.
  • The stability and memory potential of specific CD4+ T cell subsets remain incompletely understood.

Purpose of the Study:

  • To investigate the functional stability and memory potential of CD4+ T cell clonotypes during repeated Plasmodium falciparum infections.
  • To characterize subset-specific activation trajectories and identify antigen-specific clones.
  • To establish clonal fidelity as a natural phenomenon and assess the long-term memory of Type 1 regulatory T cells.

Main Methods:

  • Longitudinal single-cell RNA sequencing and T cell receptor (TCR) tracking.
  • Analysis of CD4+ T cell clonotypes in Ugandan children and adults during repeated malaria infections.
  • Tracking of antigen-specific T cell clones over hundreds of days.

Main Results:

  • Nearly all CD4+ T cell clonotypes exhibited strong fidelity to one of seven CD4+ subsets.
  • Type 1 regulatory T (Treg1) cells constituted nearly 90% of Plasmodium falciparum-specific CD4+ T cells.
  • Observed malaria-induced expansion of Treg1 effectors, long-term persistence of Treg1 memory cells, and high-fidelity recall responses post-reinfection.

Conclusions:

  • Clonal fidelity is a natural phenomenon in human CD4+ T cell responses.
  • Type 1 regulatory T cells possess stable, long-term memory potential following malaria infection.
  • This study provides insights into the cellular mechanisms underlying sustained immunity to Plasmodium falciparum.