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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...
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...
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

Overview
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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Murine Superficial Lymph Node Surgery
04:36

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Published on: May 21, 2012

Early events governing memory CD8+ T-cell differentiation.

Joshua J Obar1, Leo Lefrançois

  • 1Center for Integrated Immunology and Vaccine Research, Department of Immunology, University of Connecticut Health Center, 263 Farmington Avenue, Farmington, CT 06030-1319, USA.

International Immunology
|May 28, 2010
PubMed
Summary

Generating effective CD8(+) T-cell memory requires TCR triggering, co-stimulation, and cytokines. Recent research explores how these signals and molecular events dictate CD8(+) T-cell fate and immune response.

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Mouse Na&#239;ve CD4+ T Cell Isolation and In vitro Differentiation into T Cell Subsets
07:12

Mouse Naïve CD4+ T Cell Isolation and In vitro Differentiation into T Cell Subsets

Published on: April 16, 2015

Area of Science:

  • Immunology
  • Cellular Biology

Background:

  • CD8(+) T-cell responses are crucial for immunity.
  • Effective T-cell activation requires TCR triggering, co-stimulation, and cytokines.

Purpose of the Study:

  • To review recent findings on factors regulating CD8(+) T-cell fate.
  • To understand the molecular integration of signals in T-cell activation.

Main Methods:

  • Literature review of recent immunological studies.
  • Analysis of extracellular and intracellular regulatory factors.

Main Results:

  • TCR triggering, co-stimulation, and cytokines are essential for naive CD8(+) T cells.
  • Early molecular events integrate these signals to determine T-cell fate.

Conclusions:

  • Understanding signal integration is key to CD8(+) T-cell memory generation.
  • Extracellular and intracellular factors critically influence T-cell response outcomes.