Prostaglandin D2 (PGD2) is released from mast cells during allergic reactions and is linked to nasal congestion.
Researchers examined the distribution of hematopoietic prostaglandin D synthase (PGDS) and the PGD2 receptors (DP and CRTH2) in nasal mucosa from healthy individuals and those with chronic rhinosinusitis polyposis.
The findings showed that in healthy mucosa, PGDS was limited to a few mast cells, while in polyposis, PGDS was found in various inflammatory cells, and both PGD2 receptors were present in eosinophils and some T cells, suggesting their involvement in upper airway inflammation.