Adenosine is an immunosuppressive nucleoside, and adenosine A(2A) receptors inhibit T-cell activation. We investigated the role of A(2A) receptors in regulating T helper (Th)1- and Th2-cell development and effector function. A(2A)-receptor stimulation suppressed the development of T-cell receptor (TCR) -stimulated naive T cells into both Th1 and Th2 cells, as indicated by decreased IFN-gamma production by cells developed under Th1-skewing conditions and decreased interleukin (IL) -4, IL-5, and IL-10 production by cells developed under Th2-skewing conditions. Using A(2A) receptor-deficient mice, we demonstrate that A(2A) receptor activation inhibits Th1- and Th2-cell development by decreasing the proliferation and IL-2 production of naive T cells, irrespective of whether the cells are expanded under Th1- or Th2-skewing environment. Using in vivo established Th1 and Th2 cells, we further demonstrate the nonselective nature of A(2A) receptor-mediated immunosuppressive effects, because A(2A) receptor activation decreased IFN-gamma and IL-4 secretion and mRNA level of TCR-stimulated effector Th1 and Th2 cells, respectively. A(2A) receptor mRNA expression in both Th1 and Th2 effector cells increased following TCR stimulation. In summary, these data demonstrate that A(2A) receptor activation has strong inhibitory actions during early developmental, as well as late effector, stages of Th1- and Th2-cell responses.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2537430 | PMC |
| http://dx.doi.org/10.1096/fj.08-107458 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Adenosine A2A receptor activation is necessary to gate the TrkB-dependent intramuscular nerve sprouting during muscle reinnervation after a nerve crush.
Heliyon
January 2025
Department of Biomolecular Sciences, University of Urbino Carlo Bo, Urbino, Italy.
Compelling evidence has demonstrated that rehabilitation through physical exercise, a non-invasive and non-surgical intervention, enhances muscle reinnervation and motor recovery after peripheral nerve injury (PNI) by increasing muscle-derived brain-derived neurotrophic factor (BDNF) expression and triggering TrkB-dependent axonal plasticity. Adenosine has been widely acknowledged to trigger TrkB via A2A receptor (A2AR). Since motor nerve terminals co-express TrkBs and A2ARs and depolarizing conditions increase muscle release of BDNF and adenosine, we examined whether A2ARs activation could recapitulate the functional recovery benefits of intermittent exercise after a nerve crush.
View Article and Find Full Text PDFDevelopment of an G Protein-Coupled Receptor Fragment Molecule Screening Approach with High-Resolution Magic Angle Spinning Nuclear Magnetic Resonance.
ACS Chem Biol
January 2025
Department of Chemistry, University of Florida, Gainesville Florida 32611, United States.
Small molecules are essential for investigating the pharmacology of membrane proteins and remain the most common approach for therapeutically targeting them. However, most experimental small molecule screening methods require ligands containing radiolabels or fluorescent labels and often involve isolating proteins from their cellular environment. Additionally, most conventional screening methods are suited for identifying compounds with moderate to higher affinities ( < 1 μM) and are less effective at detecting lower affinity compounds, such as weakly binding molecular fragments.
View Article and Find Full Text PDFNerve repair with polylactic acid and inosine treatment enhance regeneration and improve functional recovery after sciatic nerve transection.
Front Cell Neurosci
January 2025
Laboratório de Neurodegeneração e Reparo - Departamento de Anatomia Patológica, Hospital Universitário Clementino Fraga Filho, HUCFF/UFRJ, Rio de Janeiro, Brazil.
Background: Following transection, nerve repair using the polylactic acid (PLA) conduit is an effective option. In addition, inosine treatment has shown potential to promote nerve regeneration. Therefore, this study aimed to investigate the regenerative potential of inosine after nerve transection and polylactic acid conduit repair.
View Article and Find Full Text PDFGeneral structure-activity relationship models for the inhibitors of Adenosine receptors: A machine learning approach.
Mol Divers
January 2025
Chemometrics and Cheminformatics Laboratory, Department of Analytical Chemistry, Tarbiat Modares University, Tehran, Iran.
Adenosine receptors (A, A, A, A) play critical roles in cellular signaling and are implicated in various physiological and pathological processes, including inflammations and cancer. The main aim of this research was to investigate structure-activity relationships (SAR) to derive models that describe the selectivity and activity of inhibitors targeting Adenosine receptors. Structural information for 16,312 inhibitors was collected from BindingDB and analyzed using machine learning methods.
View Article and Find Full Text PDFMetabolic dysfunction in mice with adipocyte specific ablation of the adenosine A2A receptor.
J Biol Chem
January 2025
Holman Division of Endocrinology, Diabetes and Metabolism, Department of Medicine, New York University Grossman School of Medicine, New Science Building, 435 E 30(th) Street, New York, NY, 10016, USA. Electronic address:
It has been well established that adenosine plays a key role in the control of inflammation through G protein coupled receptors and recently shown that it can regulate thermogenesis. Here we investigated the specific requirements of the adenosine A2A receptor (A2AR) in mature adipocytes for thermogenic functionality and metabolic homeostasis. We generated fat tissue specific adenosine A2A receptor knock-out mice to assess the influence of signaling through this receptor on brown and beige fat functionality, obesity, insulin sensitivity, inflammation and liver function.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!