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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.
Naive T cells that have not yet encountered an antigen express two primary CD...
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?
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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...
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...
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,...
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Murine Superficial Lymph Node Surgery
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Memory T cell inflation: understanding cause and effect.

Geraldine A O'Hara1, Suzanne P M Welten, Paul Klenerman

  • 1Peter Medawar Building for Pathogen Research, South Parks Road, Oxford OX1 4SY, UK. geraldine.ohara@ndm.ox.ac.uk

Trends in Immunology
|January 7, 2012
PubMed
Summary
This summary is machine-generated.

Memory T cell inflation, observed after cytomegalovirus infection, involves T cell populations maintaining high frequencies instead of contracting. This phenomenon offers potential as a vaccine strategy, impacting immune senescence.

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Identification of Rare Antigen-Specific T Cells from Mouse Lungs with Peptide:Major Histocompatibility Complex Tetramers

Published on: July 19, 2024

Area of Science:

  • Immunology
  • Virology
  • Vaccinology

Background:

  • T cell populations typically contract after viral infections to form memory cells.
  • Cytomegalovirus (CMV) infection, a common human herpesvirus, leads to atypical T cell responses.
  • Some viral infections, like parvovirus, also exhibit non-contracting T cell populations.

Purpose of the Study:

  • To discuss the phenomenon of memory T cell inflation.
  • To explore factors contributing to T cell memory inflation.
  • To consider the therapeutic applications of memory T cell inflation in vaccine strategies.

Main Methods:

  • Review of existing literature on T cell dynamics post-viral infection.
  • Analysis of T cell population behavior following cytomegalovirus and parvovirus infections.
  • Exploration of immunological mechanisms underlying T cell memory inflation.

Main Results:

  • T cell populations specific for certain epitopes do not contract after CMV infection.
  • These T cells are maintained at high frequencies with an effector-memory phenotype.
  • Memory T cell inflation is also observed in other viral infections, such as parvovirus.

Conclusions:

  • Memory T cell inflation is a distinct immunological response to specific viral infections.
  • Understanding the factors driving this phenomenon is crucial.
  • Memory T cell inflation holds potential as a novel vaccine strategy with implications for immune senescence.