Description
Plasminogenactivatorinhibitor1(PAI-1)isapeptideproteaseinhibitorthatexhibitsproliferation-enhancingactivityincancermodels.PAI-1isproducedbythrombinactivationofprotease-activatedreceptor1(PAR1)andisclinicallyusedasabioMarkerforheartdisease.PAI-1increasescellproliferationandtumorsizeofHeLaxenograftsinsomemodelsandmaybeover-expressedincanceroustissue.Inotheranimalmodelsofcancer,PAI-1exhibitsanti-apoptoticactivitythroughamechanismthatinvolvedactivationofplasminandinhibitionofFas/FasLsignaling.PAI-1alsodisplayspro-fibroticcharacteristicsandplaysaroleintype1diabeticosteoporosis;itpromotesproliferationofpulmonaryfibroblasts,enhancestheirtransitiontomyofibroblasts,andincreasescollagensynthesisandactivationofERKandAkt.