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T Cell Types and Functions01:24

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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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Autoimmune diseases are a group of disorders in which the body's immune system mistakenly attacks its own cells, tissues, and organs. This results from an overactive immune response against substances and tissues normally present in the body. Let's delve into the concept and mechanism of autoimmune diseases from an immune system point of view, explore different causes and examples of such diseases, and discuss potential solutions.
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Related Experiment Video

Updated: Apr 13, 2026

Determining Immune System Suppression versus CNS Protection for Pharmacological Interventions in Autoimmune Demyelination
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Deleterious versus protective autoimmunity in multiple sclerosis.

Milos Kostic1, Ivana Stojanovic2, Goran Marjanovic1

  • 1Department of Immunology, Medical Faculty, University of Nis, Blvd. Dr. Zorana Djindjica 81, 18000 Nis, Serbia.

Cellular Immunology
|May 7, 2015
PubMed
Summary
This summary is machine-generated.

Multiple sclerosis involves harmful T helper cells (Th1, Th9, Th17) causing inflammation and neurodegeneration. However, understanding protective autoimmunity from Th2 and regulatory T cells is key for new multiple sclerosis therapies.

Keywords:
Multiple sclerosisProtective autoimmunityRegulatory T cellsTh1 cellsTh17 cellsTh2 cellsTh9 cells

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Area of Science:

  • Neuroimmunology
  • Central Nervous System Disorders

Background:

  • Multiple sclerosis (MS) is a chronic inflammatory and neurodegenerative disease of the central nervous system.
  • Myelin-specific CD4(+) T cells are central to MS pathogenesis, with Th1, Th9, and Th17 cells mediating autoimmune responses.

Purpose of the Study:

  • To explore the differing roles of T helper cell subpopulations in MS pathogenesis.
  • To investigate the potential protective role of autoimmunity mediated by Th2 and regulatory T cells in MS.

Main Methods:

  • Review of existing evidence on T helper cell phenotypes and their contribution to MS pathology.
  • Analysis of the clinical and pathological manifestations linked to distinct T cell profiles.

Main Results:

  • Different T helper cell subsets (Th1, Th9, Th17) induce distinct inflammatory patterns, leading to blood-brain barrier disruption, demyelination, and neurodegeneration.
  • Autoimmunity mediated by Th2 cells and regulatory T cells may have a protective role in MS.

Conclusions:

  • Understanding the diverse roles of T helper cells, including protective autoimmunity, is crucial for advancing MS immunology.
  • Further research into protective autoimmunity could lead to improved therapeutic strategies for multiple sclerosis.