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Related Concept Videos

Cell-mediated Immune Responses01:40

Cell-mediated Immune Responses

Overview
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,...
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...
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...
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...

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Regulation of development and function of memory CD4 subsets.

L M Bradley1, J Harbertson, G C Freschi

  • 1Department of Immunology, The Scripps Research Institute, La Jolla, CA 92037, USA. lbradley@scripps.edu

Immunologic Research
|June 14, 2000
PubMed
Summary
This summary is machine-generated.

Understanding CD4 T cell memory is key for immunity and preventing diseases like allergies and autoimmune disorders. Research shows T cell receptor signaling, costimulation, and cytokines control memory development and subset balance.

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Area of Science:

  • Immunology
  • Cellular Biology
  • T cell immunology

Background:

  • Immunologic memory, crucial for adaptive immunity, is primarily mediated by CD4 T cells.
  • Understanding CD4 T cell memory regulation is vital for developing immune-based therapies against diseases and reducing immunopathology.

Purpose of the Study:

  • To investigate the in vivo parameters influencing CD4 memory cell differentiation.
  • To elucidate the mechanisms governing CD4 memory cell localization and effector function at sites of antigen exposure.
  • To determine the role of CD4 memory cells in the pathogenesis of autoimmune diabetes.

Main Methods:

  • Utilizing defined adoptive-transfer models to study CD4 T cell differentiation in vivo.
  • Analyzing the interplay of T cell receptor signaling, costimulation, and cytokines in memory development.
  • Investigating the roles of adhesion molecules, cytokines, and chemokines in CD4 memory subset recruitment.

Main Results:

  • A complex interplay of signals dictates the extent of CD4 memory development and the balance between Th1 and Th2 memory subsets.
  • Memory CD4 cells selectively localize to antigen-exposed sites and differentiate into effector cells.
  • CD4 memory cells contribute to the development of autoimmune diabetes.

Conclusions:

  • The differentiation and function of CD4 memory T cells are tightly regulated by multiple signaling pathways and molecular interactions.
  • Understanding these regulatory mechanisms is essential for harnessing immunologic memory for therapeutic benefit and preventing autoimmune diseases.