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Surface and total tissue factor activity of endothelial cells
W Sangtawesin1, A Hijikata-Okunomiya, N Opartkiattikul
1Department of Clinical Pathology, Siriraj Hospital, Mahidol University.
Summary
Endotoxin exposure did not increase surface tissue factor (TF) on human umbilical vein endothelial cells (HUVEC). However, endotoxin significantly increased total TF activity within HUVEC cells in a dose-dependent manner.
Area of Science:
- Endothelial cell biology
- Thrombosis research
- Immunology
Background:
- Human umbilical vein endothelial cells (HUVEC) are crucial in vascular health.
- Tissue factor (TF) is a key initiator of the coagulation cascade.
- Endotoxin is a potent trigger for thrombosis in sepsis.
Purpose of the Study:
- To investigate the effect of endotoxin on tissue factor activity in HUVEC.
- To determine if endotoxin increases surface-expressed TF on HUVEC.
- To quantify changes in total TF activity within HUVEC upon endotoxin stimulation.
Main Methods:
- Utilized a novel technique to measure TF activity in cultured HUVEC.
- Exposed HUVEC to endotoxin (E. coli O26:B6).
- Assessed TF activity on the cell surface and after cell disruption.
Main Results:
- Baseline TF activity was minimal on HUVEC surfaces and within disrupted cells.
- Endotoxin did not increase surface TF activity on HUVEC.
- A significant, dose-dependent increase in total TF activity was observed after cell disruption.
- 10 µg/ml endotoxin resulted in a five-fold increase in total TF activity.
Conclusions:
- Endotoxin primarily increases intracellular TF content in HUVEC, not surface expression.
- This finding has implications for understanding endotoxin-induced thrombosis.
- Further research into intracellular TF regulation in endothelial cells is warranted.