Journal
BLOOD
Volume 118, Issue 11, Pages 3182-3185Publisher
AMER SOC HEMATOLOGY
DOI: 10.1182/blood-2011-05-353912
Keywords
-
Categories
Funding
- Japan Society for the Promotion of Science [22590826, 21590230]
- Takeda Science Foundation
- Smoking Research Foundation
- Grants-in-Aid for Scientific Research [22590826, 21590230] Funding Source: KAKEN
Ask authors/readers for more resources
In a previous study, we demonstrated unique secretory dynamics of tissue plasminogen activator (tPA) in which tPA was retained on the cell surface in a heavy chain-dependent manner after exocytosis from secretory granules in vascular endothelial cells. Here, we examined how retained tPA expresses its enzymatic activity. Retained tPA effectively increased the lysine binding site-dependent binding of plasminogen on the cell surface and pericellular area; this was abolished by inhibition of enzymatic activity of either tPA or plasmin, which suggests that de novo generation of carboxyl-terminal lysine as a consequence of degradation of surface/pericellular proteins by plasmin is essential. Retained tPA initiated zonal clot lysis of a fibrin network that had been formed on vascular endothelial cells, which was preceded by the binding of plasminogen to the lysis front. Our results provide evidence that secreted and retained tPA is essential for maintaining both high fibrinolytic activity and effective clot lysis on the vascular endothelial cell surface. (Blood. 2011;118(11): 3182-3185)
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available