Abstract:
:Coagulation Factor (F)Xa is a serine protease that plays a crucial role during blood coagulation by converting prothrombin into active thrombin. Recently, however, it emerged that besides this role in coagulation, FXa induces intracellular signaling leading to different cellular effects. Here, we show that coagulation factor (F)Xa drives tumor cells of epithelial origin, but not endothelial cells or monocytes, into apoptosis, whereas it even enhances fibroblast survival. FXa signals through the protease activated receptor (PAR)-1 to activate extracellular-signal regulated kinase (ERK) 1/2 and p38. This activation is associated with phosphorylation of the transcription factor CREB, and in tumor cells with up-regulation of the BH3-only pro-apoptotic protein Bim, leading to caspase-3 cleavage, the main hallmark of apoptosis. Transfection of tumor cells with dominant negative forms of CREB or siRNA for either PAR-1, Bim, ERK1 and/or p38 inhibited the pro-apoptotic effect of FXa. In fibroblasts, FXa-induced PAR-1 activation leads to down-regulation of Bim and pre-treatment with PAR-1 or Bim siRNA abolishes proliferation. We thus provide evidence that beyond its role in blood coagulation, FXa plays a key role in cellular processes in which Bim is the central player in determining cell survival.
journal_name
Exp Cell Resjournal_title
Experimental cell researchauthors
Borensztajn KS,Bijlsma MF,Groot AP,Brüggemann LW,Versteeg HH,Reitsma PH,Peppelenbosch MP,Spek CAdoi
10.1016/j.yexcr.2007.04.014subject
Has Abstractpub_date
2007-07-15 00:00:00pages
2622-33issue
12eissn
0014-4827issn
1090-2422pii
S0014-4827(07)00187-5journal_volume
313pub_type
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