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T Cell Types and Functions

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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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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.
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Immunotherapy is a treatment that boosts or manipulates the immune system to fight diseases, including cancer. For instance, by stimulating an immune response through vaccinations against viruses that cause cancers, like hepatitis B virus and human papillomavirus, these diseases can be prevented. Nonetheless, some cancer cells can avoid the immune system due to their rapid mutation and division. The immune response to many cancers involves three phases: elimination, equilibrium, and escape.
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Regulatory T-cell dysfunction and its implication for cell therapy.

Nicolas Valentini1,2, Christopher J Requejo Cier1,2, Caroline Lamarche1,3

  • 1Medicine Department, Hôpital Maisonneuve-Rosemont Research Center, Montreal, QC, Canada.

Clinical and Experimental Immunology
|May 9, 2023
PubMed
Summary

Regulatory T cells (Tregs) are crucial for immune tolerance but can become dysfunctional. Understanding Treg exhaustion, senescence, anergy, and instability is vital for successful Treg adoptive immunotherapy.

Keywords:
anergycell therapyexhaustionregulatory T cells (Tregs)senescence

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Area of Science:

  • Immunology
  • Cellular Biology
  • Immunotherapy

Background:

  • Regulatory T cells (Tregs) are essential for immune tolerance via diverse mechanisms.
  • Treg adoptive immunotherapy is under investigation for transplantation and autoimmune diseases.
  • Conventional T cell dysfunctions (exhaustion, senescence, anergy) impact therapeutic efficacy.

Purpose of the Study:

  • To review Treg mechanisms of action.
  • To describe T cell dysfunction subtypes and their applicability to Tregs.
  • To guide the design and interpretation of Treg immunotherapy trials.

Main Methods:

  • Literature review of Treg biology and function.
  • Analysis of T cell dysfunction states (exhaustion, senescence, anergy).
  • Examination of Treg-specific dysfunction (instability, FOXP3 loss).

Main Results:

  • Tregs may be susceptible to exhaustion, senescence, and anergy, though findings are debated.
  • Treg instability and loss of FOXP3 expression impair suppressive function.
  • Dysfunctional Tregs can limit the effectiveness of adoptive immunotherapy.

Conclusions:

  • A comprehensive understanding of Treg biology and pathology is necessary for Treg immunotherapy.
  • Recognizing Treg dysfunction is critical for interpreting clinical and preclinical trial outcomes.
  • Knowledge of Treg dysfunction will refine the design and application of Treg-based therapies.