The purinergic G protein-coupled receptor 6 inhibits effector T cell activation in allergic pulmonary inflammation

Area of Science:

• Immunology
• Allergy Research
• G protein-coupled receptor signaling

Background:

• Allergic pulmonary inflammation involves complex immune responses.
• T cell activation is a key driver of allergic airway pathology.
• The role of purinergic receptors in allergic inflammation is not fully understood.

Purpose of the Study:

• To investigate the role of the P2Y(6) receptor in allergic pulmonary inflammation.
• To determine if P2Y(6) receptor deficiency exacerbates T cell-mediated allergic responses.

Main Methods:

• Utilized P2Y(6) receptor-deficient mice and P2Y(6)-sufficient littermates.
• Administered Dermatophagoides farinae extract intranasally to induce allergic inflammation.
• Assessed airway and tissue pathology, T cell expression of P2Y(6), cytokine production, and T cell proliferation.

Main Results:

• P2Y(6) receptor deficiency led to severe airway and tissue pathology in response to allergen exposure.
• P2Y(6) receptors were expressed on lung, lymph node, and splenic CD4(+) and CD8(+) T cells upon allergen challenge.
• P2Y(6)-deficient T cells produced higher levels of Th1/Th2 cytokines and exhibited increased proliferation.
• Absence of P2Y(6) on CD4(+) T cells, but not antigen-presenting cells, amplified cytokine generation.

Conclusions:

• P2Y(6) receptors act as endogenous inhibitors of T cell function in allergic pulmonary inflammation.
• P2Y(6) receptor signaling protects the lung from excessive allergen-induced inflammation by regulating effector T cell activation.