Journal
THROMBOSIS AND HAEMOSTASIS
Volume 100, Issue 3, Pages 483-488Publisher
SCHATTAUER GMBH-VERLAG MEDIZIN NATURWISSENSCHAFTEN
DOI: 10.1160/TH08-05-0272
Keywords
calcium; endothelial cells; heparan sulfate proteoglycan; nitric oxide; thrombin
Categories
Ask authors/readers for more resources
Thrombin induces Ca(2+) transients and subsequent nitric oxide (NO) production in vascular endothelial cells. Thrombin cleaves protease-activated receptors, resulting in activation of intracellular signals, but it is not clarified how the extracellular thrombin stays around the cells to exert its enzyme activities. This study aimed to investigate the possible involvement of heparin sulfate proteoglycan (HSPG) in the effects of thrombin on vascular endothelium. Heparinase III completely removed the polysaccharide chain of HSPG in bovine aortic endothelial cells (BAECs). Thrombin induced Ca(2+) transients in control BAECs, but not in heparinase III-treated BAECs. In contrast, ATP induced Ca(2+) transients both in control and heparinase III-treated BAECs. Thrombin that was pre-incubated with heparin also failed to induced Ca(2+) transients in BAECs. Furthermore, thrombin-induced NO production, as assessed with DAF-2 fluorescence,was suppressed in heparinase III-treated BAECs and by the pre-incubation of thrombin with heparin. ATP-induced NO production was, however, not affected in heparinase III-treated BAECs. These results indicate that it is essential for thrombin to bind to the polysaccharide chain of HSPG for inducing Ca(2+) transients and NO production in BAECs.
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