PF-04418948 antagonizes the effects of butaprost and PGE2 on an EFS-induced contraction of the human myometrium, and antagonizes PGE2-induced relaxation of carbachol pre-contracted rings of mouse trachea. PF-04418948 competitively inhibits relaxations of murine and guinea pig trachea induced by ONO-AE1-259 and PGE2 respectively. PF-04418948 restores neutrophil extracellular traps (NETs) formation in neutrophils isolated from BMT mice or HSCT patients.