Figure 2. Pathway depicting metabolites of arachidonic acid important in AERD.
Following conversion to arachidonic acid by phospholipase A2, further processing occurs via either the prostaglandin pathway mediated by COX-1/COX-2 or the leukotriene pathway mediated by 5-lipoxygenase. Red lettering shows genes inhibited by IL-4 and pink lettering show genes stimulated by IL-4 and IFN-γ.