PAR2 antagonist C391 (C391) is a selective PAR2 antagonist, potently inhibits peptidomimetic-induced PAR2 Ca2+ signalling with IC50 of 1.3 uM.C391 blocks both PAR2 Ca2+ and MAPK signalling pathways activated by peptidomimetics and/or proteinase activation.C391 effectively attenuated compound 48/80-induced thermal hyperalgesia in vivo.C391 blocked A. alternata-induced, PAR2-dependent Ca2+ and MAPK signalling in 16HBE14o- cells, as well as β-arrestin recruitment in HEK 293 cells.C391 effectively attenuated A. alternata-induced inflammation, mucus production, mucus cell hyperplasia and airway hyperresponsiveness in acute allergen-challenged murine models.
