Related Experiment Video

Updated: May 13, 2026

Adenoviral Transduction of Naive CD4 T Cells to Study Treg Differentiation
15:33

Adenoviral Transduction of Naive CD4 T Cells to Study Treg Differentiation

Published on: August 13, 2013

Beta2-adrenergic receptor signaling in CD4+ Foxp3+ regulatory T cells enhances their suppressive function in a

Marcia G Guereschi1, Leandro P Araujo, Juliana T Maricato

  • 1Department of Microbiology, Immunology and Parasitology, Paulista Medical School, Federal University of São Paulo, São Paulo, Brazil.

European Journal of Immunology
|February 26, 2013
PubMed

Insights

Sympathetic nervous system activation via Beta2-adrenergic receptors (B2AR) enhances regulatory T-cell (Treg) function. This signaling boosts Treg suppressive activity, crucial for immune regulation and self-tolerance.

Area of Science:

  • Immunology
  • Neuroscience
  • Cell Biology

Background:

  • Beta2-adrenergic receptor (B2AR) signaling typically inhibits Th1 cell responses.
  • Regulatory T cells (Treg) are critical for immune homeostasis and self-tolerance.
  • The role of adrenergic receptors and noradrenaline in Treg function remains largely unexplored.

Purpose of the Study:

  • To investigate the expression and function of B2AR in Treg cells.
  • To determine the impact of noradrenaline and B2AR activation on Treg cell activity.
  • To elucidate the signaling pathways involved in B2AR-mediated effects on Tregs.

Main Methods:

  • Flow cytometry and intracellular cAMP assays to assess B2AR expression and activation.
  • In vitro Treg suppression assays.
  • Quantitative PCR to measure cytokine mRNA levels (e.g., IL-2).
  • Western blotting to detect protein phosphorylation (e.g., CREB) and expression (e.g., CTLA-4).

Main Results:

  • Foxp3(+) Treg cells express functional B2AR, leading to increased intracellular cAMP and PKA-dependent CREB phosphorylation.
  • B2AR activation significantly enhances the in vitro suppressive capacity of Treg cells.
  • B2AR signaling decreases IL-2 mRNA in responder T cells and promotes the conversion of CD4(+) Foxp3(-) cells into induced Tregs.
  • B2AR signaling upregulates CTLA-4 expression in Treg cells via a PKA-dependent mechanism.
  • PKA inhibition completely abrogates the B2AR-mediated enhancement of Treg suppressive function.

Conclusions:

  • Treg cells express functional B2AR, which positively modulates their suppressive activity.
  • Sympathetic nervous system signaling through B2AR can enhance Treg function, contributing to immune regulation.
  • These findings reveal a novel mechanism by which the nervous and immune systems interact to maintain self-tolerance.

More Related Videos

In Vitro Differentiation of Human CD4+FOXP3+ Induced Regulatory T Cells (iTregs) from Naïve CD4+ T Cells Using a TGF-β-containing Protocol08:20

In Vitro Differentiation of Human CD4+FOXP3+ Induced Regulatory T Cells (iTregs) from Naïve CD4+ T Cells Using a TGF-β-containing Protocol

Published on: December 30, 2016

Generation of Induced Regulatory T Cells from Primary Human Naïve and Memory T Cells14:23

Generation of Induced Regulatory T Cells from Primary Human Naïve and Memory T Cells

Published on: April 16, 2012

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.
Th1 cells stimulate dendritic cells to express necessary co-stimulatory molecules on their surfaces for...
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.
Naive T cells that have not yet encountered an antigen express two primary CD...
TGF - β Signaling Pathway01:16

TGF - β Signaling Pathway

The TGF-β signaling pathway regulates cell growth, differentiation, adhesion, motility, and development. TGF-β ligands that induce TGF-β signaling are synthesized in their latent form. Several proteases or cell surface receptors such as integrins act upon the latent form, releasing the active ligand. There are three types of mammalian TGF-βs: (TGF-β1, TGF-β2, and TGF-β3) that bind as homodimers or heterodimers to TGF-β receptors. The TGF-β receptors are of three kinds RI, RII, and RIII. The RI...
GPCRs Regulate Adenylyl Cylase Activity01:09

GPCRs Regulate Adenylyl Cylase Activity

Some GPCRs transmit signals through adenylyl cyclase (AC), a transmembrane enzyme. AC helps synthesize second messenger cyclic adenosine monophosphate (cAMP). AC catalyzes cyclization reaction and converts ATP to cAMP by releasing a pyrophosphate. The pyrophosphate is further hydrolyzed to phosphate by the enzyme pyrophosphatase, which drives cAMP synthesis to completion. However, cAMP is rapidly degraded to 5′ AMP by the enzymes phosphodiesterase (PDE), preventing overstimulation of cells.
Two...
Receptor Downregulation in MVBs01:15

Receptor Downregulation in MVBs

Multivesicular bodies (MVBs) are mature endosomes that sort ubiquitinated proteins and then fuse with lysosomes to degrade the sorted proteins. Epidermal growth factor (EGF) and its receptor (EGFR) form a complex that can be internalized through endocytosis, sorted into an MVB, and later degraded.
The EGFR can initiate signaling pathways that  lead to cell proliferation, migration, and differentiation. Overexpression of EGFR  stimulates cells to proliferate. Excessive  EGFR activation may...
Amplifying Signals via Enzymatic Cascade01:22

Amplifying Signals via Enzymatic Cascade

When a ligand binds to a cell-surface receptor, the receptor's intracellular domain changes shape, which may either activate its enzyme function or allow its binding to other molecules. The initial signal is amplified by most signal transduction pathways. This means that a single ligand molecule can activate multiple molecules of a downstream target. Proteins that relay a signal are most commonly phosphorylated at one or more sites, activating or inactivating the protein. Kinases catalyze the...