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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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Immunological Memory01:23

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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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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.
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Antigens Involved in Adaptive Immunity01:26

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An antigen is any substance the immune system identifies as foreign and potentially harmful to the body, prompting an immune response. Antigens have two functional properties: immunogenicity and reactivity. Immunogenicity is the ability of an antigen to stimulate a specific immune response. At the same time, reactivity describes the antigen's ability to react with the cells and antibodies produced in response to it.
Complete Antigens
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Special Features of Adaptive Immunity01:20

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The adaptive immune system, a crucial component of the overall immune response, offers a highly specialized defense against pathogens. It involves specific cell types and features, enabling it to combat infections effectively and efficiently.
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The Isolation, Differentiation, and Quantification of Human Antibody-secreting B Cells from Blood: ELISpot as a Functional Readout of Humoral Immunity
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The Isolation, Differentiation, and Quantification of Human Antibody-secreting B Cells from Blood: ELISpot as a Functional Readout of Humoral Immunity

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Human T Cell Memory: A Dynamic View.

Derek C Macallan1,2, José A M Borghans3, Becca Asquith4

  • 1Institute for Infection & Immunity, St George's, University of London, Cranmer Terrace, London SW17 0RE, UK. macallan@sgul.ac.uk.

Vaccines
|February 7, 2017
PubMed
Summary
This summary is machine-generated.

Understanding T cell memory dynamics is key for long-term immunity. This perspective explains how memory cell populations persist, improving vaccine strategies against pathogens.

Keywords:
dynamicsimmune memorykineticsproliferationsurvivalturnovervaccinationvaccine

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Area of Science:

  • Immunology
  • Cell Biology
  • Vaccinology

Background:

  • Long-term T cell-mediated protection relies on memory cell pools.
  • Maintaining these memory populations post-exposure or vaccination is crucial for defense.
  • A dynamic viewpoint offers insights into T cell memory maintenance.

Purpose of the Study:

  • To review T cell memory from a dynamic perspective.
  • To explain the persistence of immunological memory despite short individual cell lifespans.
  • To highlight how a dynamic view can improve vaccine efficacy.

Main Methods:

  • Review of existing literature on T cell memory.
  • Analysis of T cell population kinetics and differentiation pathways.
  • Focus on clonal population dynamics rather than individual cell behavior.

Main Results:

  • A dynamic view resolves the paradox of short-lived cells and long-term memory by focusing on clonal persistence.
  • Clonal survival depends on balancing proliferation, death, and differentiation rates within distinct phenotypic pools.
  • Memory T cells in non-lymphoid tissues and bone marrow are critical but understudied.

Conclusions:

  • Viewing T cell memory dynamically clarifies population maintenance mechanisms.
  • This perspective shifts vaccine focus from primary response size to clone survival.
  • Understanding these dynamics offers opportunities to enhance vaccine efficacy.