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Related Concept Videos

Immunological Memory01:23

Immunological Memory

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.
What is Immunological Memory?
Immunological memory is an integral function of the immune system that allows it to recognize and react more rapidly and effectively to pathogens previously encountered. This feature is...
Cells of the Adaptive Immune Response01:23

Cells of the Adaptive Immune Response

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...
Vaccines01:21

Vaccines

Vaccines are among the most effective tools in preventive medicine, designed to prepare the immune system to recognize and combat infectious agents. By introducing antigens—substances that the immune system identifies as foreign—vaccines stimulate an adaptive immune response that leads to immunological memory. This immunological memory enables the body to mount a faster and more effective response upon future exposures to the actual pathogen.Vaccines can be categorized based on the type of...
Special Features of Adaptive Immunity01:20

Special Features of Adaptive Immunity

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.
The primary cell types involved in adaptive immunity are T cells and B cells. Each type has a unique role in defending the body against pathogens. T cells are responsible for cell-mediated immunity. They identify and eliminate infected cells directly,...
Cell-mediated Immune Responses01:40

Cell-mediated Immune Responses

Overview
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.
Naive T cells that have not yet encountered an antigen express two primary CD...

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A Suction Blister Protocol to Study Human T-cell Recall Responses In Vivo
11:17

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Published on: August 11, 2018

CD4 memory T cells on trial: immunological memory without a memory T cell.

Eric B Bell1, Jürgen Westermann

  • 1Faculty of Life Sciences, Immunology Section, University of Manchester, Manchester M13 9PT, UK. eric.bell@manchester.ac.uk

Trends in Immunology
|August 5, 2008
PubMed
Summary
This summary is machine-generated.

Immunological memory relies on CD4 T cells. This study suggests memory arises from increased naive-like CD4 T cells, not specialized types, with antigen presence influencing longevity.

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Area of Science:

  • Immunology
  • Cellular Biology
  • Vaccinology

Background:

  • Immunological memory is vital for adaptive immunity.
  • CD4 T cells play a critical role in immunological memory.
  • Current models propose specialized long-lived T cell subsets for memory.

Purpose of the Study:

  • To investigate the long-term alterations in CD4 T cells post-antigen stimulation.
  • To propose an alternative model for CD4 T cell-mediated immunological memory.
  • To explore factors influencing the longevity of immune memory.

Main Methods:

  • Comparative analysis of CD4 T cell behavior after antigen exposure.
  • Modeling of T cell population dynamics and lifespan.
  • Assessment of antigen persistence impact on memory duration.

Main Results:

  • No conclusive evidence for permanent alteration of CD4 T cells by antigen.
  • Proposed model: memory derived from increased frequency of long-lived, naive-like CD4 T cells.
  • Residual antigen significantly affects memory response longevity.

Conclusions:

  • CD4 T cell memory may not rely on specialized, short-lived effector cells.
  • A model of increased naive-like CD4 T cell frequency offers a new perspective.
  • Findings could inform the development of CD4 T cell-based vaccines.