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Related Concept Videos

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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.
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Related Experiment Video

Updated: May 29, 2026

A Simple and Efficient Method for Testing Immunomodulatory Agents for Generation of Tolerogenic Dendritic Cells from Human CD14+ Monocytes
11:34

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TLR agonists downregulate H2-O in CD8alpha- dendritic cells.

Gavin W Porter1, Woelsung Yi, Lisa K Denzin

  • 1Immunology Program, Sloan-Kettering Institute, Memorial Sloan-Kettering Cancer Center, New York, NY 10065, USA.

Journal of Immunology (Baltimore, Md. : 1950)
|September 16, 2011
PubMed
Summary

Dendritic cell (DC) maturation downregulates H2-O, a key molecule in MHC class II (MHCII) presentation. This differential regulation in DC subsets influences immune responses by altering MHCII peptide presentation.

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Published on: May 21, 2012

Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • Peptide loading onto MHC class II (MHCII) molecules is crucial for adaptive immunity.
  • Nonclassical MHCII-related molecules H2-M and H2-O modulate MHCII function.
  • Regulation of H2-M and H2-O during dendritic cell (DC) maturation is not well understood.

Purpose of the Study:

  • To investigate the modulation of H2-M and H2-O in different mouse DC subsets upon maturation.
  • To determine the role of Toll-like receptor (TLR) agonists in H2-O and H2-M regulation in DCs.
  • To elucidate the mechanism behind H2-O downregulation.

Main Methods:

  • In vivo analysis of H2-O and H2-M expression in CD8α(-) and CD8α(+) DCs from mice treated with TLR agonists.
  • Assessment of H2-M/H2-O ratios in response to maturation stimuli.
  • Evaluation of TLR4 signaling involvement using LPS.
  • Analysis of H2-O downregulation mechanisms, including protein degradation and mRNA levels.

Main Results:

  • H2-O was significantly downregulated in CD8α(-) DCs but only modestly in CD8α(+) DCs following TLR agonist stimulation.
  • H2-M levels showed slight downregulation in both DC subsets, leading to increased H2-M/H2-O ratios in CD8α(-) DCs.
  • TLR-mediated H2-O downregulation was specific to DCs and required TLR4 signaling.
  • H2-O downregulation occurred via protein degradation and reduced mRNA levels.

Conclusions:

  • Differential modulation of H2-O and H2-M in DC subsets during maturation impacts MHCII presentation.
  • CD8α(-) DCs, with increased H2-M/H2-O ratios, are poised for initiating CD4-restricted immune responses.
  • CD8α(+) DCs, with lower H2-O levels, may promote immune tolerance through altered MHCII peptide presentation.