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Attenuated allergic airway inflammation in Cd39 null mice
1Department of Pneumology, University Medical Center, Freiburg, Germany. marco.idzko@uniklinik-freiburg.de
Allergy
|March 5, 2013
Summary
Mice lacking CD39 showed higher airway ATP but less allergic airway inflammation. This was due to impaired dendritic cell function and T-cell priming, revealing CD39
Area of Science:
- Immunology
- Allergy Research
- Purinergic Signaling
Background:
- Extracellular Adenosine-5'-Triphosphate (ATP) drives allergic airway inflammation (AAI) by activating dendritic cells (DCs).
- CD39, an ectonucleotidase on DCs, regulates extracellular ATP levels in airways.
- CD39 modulates DC immune responses, impacting adaptive/haptenic immunity.
Purpose of the Study:
- To investigate the impact of CD39 deletion on allergic airway inflammation (AAI).
- To evaluate the role of purinergic signaling perturbations in AAI models.
Main Methods:
- Utilized ovalbumin (OVA)-alum and house dust mite (HDM) models of AAI in Cd39(-/-) mice.
- Employed migration assays, time-lapse microscopy, and T-cell priming assays to assess DC function.
- Determined the functional relevance of CD39 on bone marrow-derived DCs (BMDCs) in Th2-mediated responses.
Main Results:
- Cd39(-/-) mice had increased BALF ATP but paradoxically reduced AAI.
- Observed decreased myeloid DC activation and chemotaxis toward ATP in Cd39(-/-) mice.
- Cd39(-/-) DCs showed reduced capacity to prime Th2 responses and form immune synapses with T cells.
Conclusions:
- CD39-deficient DCs have a limited ability to induce Th2 immunity in DC-driven AAI models.
- Perturbed purinergic signaling due to CD39 deficiency plays a role in AAI pathogenesis.
