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Related Concept Videos

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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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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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B Cell Activation and Differentiation01:24

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The adaptive immune response, a sophisticated defense mechanism, relies on the activation and differentiation of B lymphocytes, or B cells. These processes enable our bodies to mount a tailored response against specific pathogens such as bacteria, free virus particles, toxins, and parasites.
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The adaptive immune system, a crucial component of the overall immune response, offers a highly specialized defense against pathogens. It involves specific cell types and features, enabling it to combat infections effectively and efficiently.
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Related Experiment Video

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Azithromycin Differentially Alters TCR-Activated Helper T Cell Subset Phenotype and Effector Function.

Abdul Wahid Ansari1, Fatemeh Saheb Sharif-Askari1, Manju Nidagodu Jayakumar1

  • 1Sharjah Institute for Medical Research, University of Sharjah, Sharjah, United Arab Emirates.

Frontiers in Immunology
|October 29, 2020
PubMed
Summary

Azithromycin (AZM) impacts T helper cell subsets by suppressing the expansion of hyperactivated CCR4+CXCR3+ (Th0) cells. This macrolide antibiotic also reduces inflammatory cytokine production and cell viability, influencing T cell function.

Keywords:
CCR4CD4+ helper T cellsCXCR3IFN-γIL-4anti-inflammatoryapoptosisazithromycin

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Area of Science:

  • Immunology
  • Pharmacology

Background:

  • Azithromycin (AZM) possesses anti-inflammatory properties beyond its antibiotic effects, particularly in respiratory conditions.
  • A key anti-inflammatory mechanism involves inhibiting CD4+ helper T (Th) cell effector function.
  • The specific impact of AZM on distinct Th subsets remains unclear.

Purpose of the Study:

  • To elucidate the cellular basis of phenotypic and functional changes in Th subsets after *in vitro* AZM treatment.
  • To investigate AZM's differential effects on Th subset expansion, proliferation, and cytokine production.

Main Methods:

  • Utilized well-characterized Th subsets defined by chemokine receptor expression (CCR4, CXCR3).
  • Assessed T cell receptor (TCR)-stimulated expansion, proliferation, cytokine production (IFN-γ, IL-4), receptor expression, and viability *in vitro*.
  • Compared effects on CCR4+CXCR3+ (Th0), CCR4-CXCR3+ (Th1-like), and CCR4+CXCR3- (Th2-like) cells.

Main Results:

  • AZM significantly suppressed the expansion of TCR-stimulated hyperactivated CCR4+CXCR3+ (Th0) cells compared to Th1-like and Th2-like cells.
  • Diminished cell proliferation was observed in AZM-treated Th subsets.
  • AZM inhibited the production of inflammatory cytokines IFN-γ and IL-4, reduced CCR4 and CXCR3 expression, and decreased the viability of all studied Th subsets.

Conclusions:

  • AZM differentially impacts the phenotype and function of TCR-activated Th subsets.
  • Downregulation of CCR4 and CXCR3, along with suppressed Th0 expansion, may affect T cell trafficking and differentiation into effector cells.
  • AZM's effects on Th subsets offer insights into its anti-inflammatory mechanisms in respiratory diseases.