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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.
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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.
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Multiple Sclerosis l: Introduction01:19

Multiple Sclerosis l: Introduction

Multiple sclerosis is a chronic autoimmune disease of the central nervous system (CNS) that affects the brain, spinal cord, and optic nerves. It is an inflammatory demyelinating disorder and a leading cause of neurological disability in young adults.EpidemiologyMS commonly begins between 20 and 40 years of age and is twice as common in women. Its exact cause remains unclear, but genetic susceptibility contributes, with higher risk in first-degree relatives and identical twins. A greater...
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
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Inflammatory Response01:28

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An inflammatory response is a localized, nonspecific immune reaction that occurs when a tissue is injured. It is characterized by redness, swelling, heat, and pain, which are commonly called the cardinal signs and symptoms of inflammation. Inflammation can sometimes result in a loss of function.
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Cell-mediated Immune Responses

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Isolation and Th17 Differentiation of Na&iuml;ve CD4 T Lymphocytes
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Mucosal-associated invariant T cells regulate Th1 response in multiple sclerosis.

Yusei Miyazaki1, Sachiko Miyake, Asako Chiba

  • 1Department of Immunology, National Institute of Neuroscience, NCNP, Ogawahigashi, Kodaira, Tokyo, Japan.

International Immunology
|June 30, 2011
PubMed
Summary

Mucosal-associated invariant T (MAIT) cells are significantly reduced in multiple sclerosis (MS) patients, particularly during relapse. These cells exhibit suppressive activity, suggesting a potential immune-regulatory role in managing MS disease activity.

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Area of Science:

  • Immunology
  • Neuroimmunology
  • T cell biology

Background:

  • Mucosal-associated invariant T (MAIT) cells are innate immune cells with a known role in autoimmune diseases.
  • Their specific function and frequency in multiple sclerosis (MS), a chronic autoimmune neurological disorder, remain largely uncharacterized.
  • Understanding MAIT cell dynamics is crucial for elucidating immune dysregulation in MS.

Purpose of the Study:

  • To investigate the frequency and functional characteristics of MAIT cells in the peripheral blood of multiple sclerosis patients.
  • To determine the correlation between MAIT cell levels and disease activity (remission, relapse, active disease) in MS.
  • To explore potential interactions between MAIT cells and other immune cell populations in MS.

Main Methods:

  • Flow cytometry analysis of peripheral blood mononuclear cells (PBMCs) from MS patients and healthy controls.
  • Quantification of MAIT cell frequency and its correlation with clinical disease status.
  • In vitro assays to assess the suppressive function of MAIT cells on T cell activation and cytokine production (e.g., IFN-γ).

Main Results:

  • MAIT cell frequency was significantly reduced in MS patients compared to healthy controls, with further reductions observed during relapse.
  • MAIT cell levels correlated inversely with disease activity, increasing with clinical recovery.
  • MAIT cells demonstrated in vitro suppressive activity against IFN-γ production by T cells, independent of IL-10, ICOS, or B cells.

Conclusions:

  • MAIT cells play a potentially immune-regulatory role in multiple sclerosis.
  • Reduced MAIT cell frequency in MS may contribute to disease pathogenesis by diminishing immune suppression.
  • MAIT cells may exert their suppressive function through cell-contact-dependent mechanisms, impacting pathogenic T(h)1 responses.