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Adenoviral Transduction of Naive CD4 T Cells to Study Treg Differentiation
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Targeting ß2 adrenergic receptors regulate human T cell function directly and indirectly.

A Zalli1, J A Bosch2, O Goodyear3

  • 1School of Sports and Exercise, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK.

Brain, Behavior, and Immunity
|December 21, 2014
PubMed
Summary
This summary is machine-generated.

Selective beta-2 adrenergic receptor (ß2AR) agonist salmeterol inhibits T cell and NK cell functions. This immune cell modulation, via ß2AR signaling, reduces inflammatory cytokine production and cytotoxic activity, with CD8 T cells and NK cells showing greater inhibition than CD4 T cells.

Keywords:
Adrenergic agonistsCatecholaminesImmune functionLymphocytosisSympathetic nervous system

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Area of Science:

  • Immunology
  • Neuroimmunology
  • Pharmacology

Background:

  • Central nervous system activation influences immune cells via catecholamines acting on beta-2 adrenergic receptors (ß2AR).
  • Previous research often used non-specific cell stimulation, lacking focus on antigen-specific responses and distinguishing direct vs. indirect ß2AR effects on T cells and antigen-presenting cells (APCs).

Purpose of the Study:

  • To investigate the impact of salmeterol (Sal), a selective ß2AR agonist, on antigen-specific T cell responses (IFN-γ production) and cytotoxic cell killing.
  • To elucidate the direct and indirect effects of ß2AR stimulation on T cells and APCs.

Main Methods:

  • Stimulation of T cells and APCs with Cytomegalovirus lysate, pp65 peptides, or Staphylococcal enterotoxin B.
  • Assessing IFN-γ production in CD4 and CD8 T cells following salmeterol or epinephrine treatment.
  • Evaluating cytotoxic cell killing using the CD107a assay with target cells (T-CHO, K562).

Main Results:

  • Salmeterol reduced IFN-γ(+) CD4 and CD8 T cells, with stronger inhibition in CD8 T cells, via a ß2AR-dependent pathway.
  • Salmeterol suppressed cytotoxicity of CD8 T cells and NK cells, with NK cells showing greater inhibition than CD8 T cells.
  • Both direct and indirect (via APCs) ß2AR stimulation inhibited inflammatory cytokine production and cytotoxic activity.

Conclusions:

  • Targeting ß2AR on lymphocytes and APCs inhibits inflammatory cytokine production and cytotoxic cell killing.
  • A hierarchy of inhibition exists, with CD8 T cells and NK cells being more sensitive to ß2AR-mediated suppression than CD4 T cells.