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Related Concept Videos

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...
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...
Immune Response Against Viral Pathogens01:29

Immune Response Against Viral Pathogens

The immune system's response to viral infections is a complex and coordinated process involving natural killer (NK) cells, T cell-mediated responses, and antibody-mediated responses.
NK Cells
NK cells are a crucial part of our innate immune system, acting as the first line of defense against viral infections. These cells can recognize and kill infected cells without prior exposure to the virus, effectively slowing down the spread of infection. Additionally, NK cells produce proinflammatory...
Cell-mediated Immune Responses01:40

Cell-mediated Immune Responses

Overview
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...

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Related Experiment Video

Updated: Jul 6, 2026

Generation of Human Monocyte-derived Dendritic Cells from Whole Blood
07:35

Generation of Human Monocyte-derived Dendritic Cells from Whole Blood

Published on: December 24, 2016

Memory CD8+ T cells protect dendritic cells from CTL killing.

Payal B Watchmaker1, Julie A Urban, Erik Berk

  • 1Department of Surgery, University of Pittsburgh, Pittsburgh, PA 15213-1863, USA.

Journal of Immunology (Baltimore, Md. : 1950)
|March 7, 2008
PubMed
Summary
This summary is machine-generated.

Memory CD8(+) T cells protect dendritic cells (DCs) by enhancing IL-12 production and inducing protective factors, unlike effector CD8(+) T cells that kill DCs. This DC protection explains CD8(+) T cell memory and vaccine efficacy.

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Last Updated: Jul 6, 2026

Generation of Human Monocyte-derived Dendritic Cells from Whole Blood
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Published on: December 24, 2016

Tailoring In Vivo Cytotoxicity Assays to Study Immunodominance in Tumor-specific CD8+ T Cell Responses
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Preparation of Tumor Antigen-loaded Mature Dendritic Cells for Immunotherapy
08:40

Preparation of Tumor Antigen-loaded Mature Dendritic Cells for Immunotherapy

Published on: August 1, 2013

Area of Science:

  • Immunology
  • Cellular immunology
  • T cell biology

Background:

  • CD8(+) T cells exhibit dual roles in immune responses, capable of both suppression and promotion.
  • Differentiating the functions of effector and memory CD8(+) T cells is crucial for understanding immune regulation.

Purpose of the Study:

  • To compare the regulatory functions of human effector and memory CD8(+) T cells on dendritic cell (DC) survival and function.
  • To elucidate the mechanisms by which CD8(+) T cells modulate DC activity and immune responses.

Main Methods:

  • Comparison of human effector cytotoxic T lymphocytes (CTLs) and memory CD8(+) T cells.
  • Assessment of DC survival, IL-12 production, and induction of Th1 and CTL responses.
  • Analysis of granzyme B, perforin, TNF-alpha, and PI-9 expression in CD8(+) T cells and DCs.

Main Results:

  • Effector CD8(+) T cells (CTLs) induce DC death via granzyme B and perforin.
  • Memory CD8(+) T cells enhance DC IL-12 production and promote Th1 and CTL responses.
  • Memory CD8(+) T cells induce DC expression of PI-9, an endogenous granzyme B inhibitor, protecting DCs from CTL-mediated killing.

Conclusions:

  • Memory CD8(+) T cells protect DCs, contrasting with effector CTLs.
  • This DC-protective function contributes to CD8(+) T cell memory and recall responses.
  • Findings support the importance of delayed vaccine booster doses for optimal immunization outcomes.