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Related Concept Videos

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...
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...
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...
Cell-mediated Immune Responses01:40

Cell-mediated Immune Responses

Overview
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...

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Related Experiment Video

Updated: May 11, 2026

Murine Model of CD40-activation of B cells
12:24

Murine Model of CD40-activation of B cells

Published on: March 5, 2010

CD40L expression permits CD8+ T cells to execute immunologic helper functions.

Marco Frentsch1, Regina Stark, Nadine Matzmohr

  • 1Regenerative Immunology and Aging, Berlin-Brandenburg Center for Regenerative Therapies, Charité University Medicine, Berlin, Germany.

Blood
|May 31, 2013
PubMed
Summary
This summary is machine-generated.

Most CD8(+) T cells, crucial for fighting infections, can also provide immune help. These CD40L(+) CD8(+) T cells activate other immune cells and are potential candidates for immune therapies.

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Generation of Human CD40-activated B cells
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Murine Model of CD40-activation of B cells
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Generation of Human CD40-activated B cells
13:27

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Tailoring In Vivo Cytotoxicity Assays to Study Immunodominance in Tumor-specific CD8+ T Cell Responses
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Tailoring In Vivo Cytotoxicity Assays to Study Immunodominance in Tumor-specific CD8+ T Cell Responses

Published on: May 6, 2019

Area of Science:

  • Immunology
  • Cellular Biology
  • Molecular Medicine

Background:

  • CD8(+) T cells are primarily known for their cytotoxic functions against intracellular pathogens.
  • CD4(+) T cells are recognized for their essential helper functions in adaptive immunity.

Purpose of the Study:

  • To investigate the expression of CD40 ligand (CD40L) on CD8(+) T cells.
  • To characterize the functional capabilities of CD40L-expressing CD8(+) T cells in human immune responses.

Main Methods:

  • Analysis of human antigen-specific CD8(+) T cell populations.
  • In vitro and in vivo functional assays to assess helper functions.
  • Cytokine expression profiling of CD40L(+) CD8(+) T cells.

Main Results:

  • A significant proportion of central and effector memory CD8(+) T cells express CD40L.
  • CD40L(+) CD8(+) T cells are found in human immune responses to influenza and yellow fever virus.
  • These cells exhibit potent in vitro and in vivo helper functions, including antigen-presenting cell activation.
  • Their cytokine profile resembles that of CD4(+) T helper cells, not cytotoxic CD8(+) T cells.

Conclusions:

  • Helper functions are not exclusive to CD4(+) T cells but are also a common feature of CD8(+) T cell responses.
  • CD40L(+) CD8(+) T cells represent a distinct subset with versatile immune-modulatory capacities.
  • These cells hold promise for immune therapies, especially in settings with limited CD4(+) T cell help or PAMP signals.