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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...
T Cell Types and Functions01:24

T Cell Types and Functions

When T cells with CD4 markers are activated, they give rise to two types of effector cells: helper T cells and regulatory T cells. Meanwhile, T cells with CD8 markers differentiate into effector cytotoxic T cells. The differentiation of CD4 T cells into helper T cell subsets, such as Th1, Th2, and Th17 cells, is dependent on the antigen type, antigen-presenting cell, and regulatory cytokines.
Th1 cells stimulate dendritic cells to express necessary co-stimulatory molecules on their surfaces for...
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,...
Cytotoxic T Cells-mediated Immune Response01:27

Cytotoxic T Cells-mediated Immune Response

Cytotoxic T cells are a vital component of the immune system. They have the remarkable ability to identify and target antigens on infected or abnormal cells. These antigens often originate from intracellular pathogens such as viruses or abnormal proteins cancer cells produce.
Immunological surveillance is the ability of immune cells to monitor and eliminate infected cells with intracellular pathogens, neoplastically transformed cells, and cells with non-self antigens. Cytotoxic T cells and NK...
B Cell Activation and Differentiation01:24

B Cell Activation and Differentiation

The adaptive immune response, a sophisticated defense mechanism, relies on the activation and differentiation of B lymphocytes, or B cells. These processes enable our bodies to mount a tailored response against specific pathogens such as bacteria, free virus particles, toxins, and parasites.
When naive B cells encounter a specific antigen that can bind to the B cell receptor (BCR) on their surface, they undergo sensitization to respond to the antigen's presence. Sensitization begins with...
Cell-mediated Immune Responses01:40

Cell-mediated Immune Responses

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Antigen-specific T-T interactions regulate CD4 T-cell expansion.

Julie Helft1, Alexandra Jacquet, Nathalie T Joncker

  • 1Laboratoire d'Immunologie Clinique, Inserm U653, Institut Curie, Paris.

Blood
|June 10, 2008
PubMed
Summary
This summary is machine-generated.

CD4 T cells regulate immune responses by capturing antigen-MHC complexes, presenting them to experienced T cells to inhibit further recruitment. This novel feedback loop ensures functional antigen regulation and preserves naive T cell diversity.

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Area of Science:

  • Immunology
  • Cellular Biology
  • T-cell Regulation

Background:

  • CD4 T-cell numbers are critical during immune responses, influenced by antigen load, T-cell frequency, and cell type (naive vs. experienced).
  • Existing models of T-cell regulation do not fully account for all these factors, necessitating a more comprehensive understanding.

Purpose of the Study:

  • To identify and characterize a novel mechanism for CD4 T-cell regulation during immune responses.
  • To investigate how this mechanism integrates multiple parameters like antigen amount and T-cell repertoire.

Main Methods:

  • Investigated T-cell interactions and antigen presentation dynamics in an immune response model.
  • Utilized antigen-MHC complexes and assessed T-cell recruitment and proliferation.
  • Examined the effects of antigen-presenting cells and T-cell populations on regulatory feedback.

Main Results:

  • Discovered that CD4 T cells capture cognate antigen-MHC complexes from antigen-presenting cells.
  • Demonstrated that these captured complexes are presented to Ag-experienced CD4 T cells, inducing specific inhibition.
  • Observed that this inhibition selectively allows naive T-cell recruitment, maintaining repertoire diversity and regulating proliferation based on antigen levels.

Conclusions:

  • A novel negative feedback loop in CD4 T-cell regulation has been identified, mediated by T-cell-T-cell antigen presentation.
  • This mechanism ensures antigen-specific regulation of T-cell proliferation and preserves the diversity of the naive T-cell repertoire.
  • The findings offer new insights into immune response control and T-cell homeostasis.