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C5a induces tissue factor activity on endothelial cells
K Ikeda1, K Nagasawa, T Horiuchi
1First Department of Internal Medicine, Faculty of Medicine, Kyushu University, Fukuoka, Japan.
Thrombosis and Haemostasis
|February 1, 1997
Summary
Recombinant human C5a significantly increases tissue factor (TF) activity and TF mRNA levels in human umbilical vein endothelial cells (HUVEC). This C5a-induced TF expression, linked to inflammation and coagulation, was reduced by methylprednisolone.
Area of Science:
- Biochemistry
- Immunology
- Cell Biology
Background:
- Tissue factor (TF) is a key regulator of blood coagulation, acting as a cofactor for factor VIIa.
- TF expression on endothelial cells can be triggered by inflammatory stimuli like LPS, IL-1β, and TNFα.
Purpose of the Study:
- To investigate the effect of recombinant human C5a on TF activity and expression in human umbilical vein endothelial cells (HUVEC).
Main Methods:
- Human umbilical vein endothelial cells (HUVEC) were treated with varying concentrations of recombinant human C5a.
- TF activity was measured, and TF mRNA levels were assessed using RT-PCR.
- The effect of methylprednisolone on C5a-induced TF activity was evaluated.
Main Results:
- Recombinant human C5a induced TF activity in HUVEC in a dose-dependent manner, with peak activity observed 3-6 hours post-treatment.
- TF mRNA levels significantly increased (3.75-fold) after 3 hours of incubation with C5a, indicating transcriptional regulation.
- Methylprednisolone inhibited the C5a-mediated induction of TF activity.
Conclusions:
- C5a is a potent inducer of TF activity and mRNA in HUVEC, suggesting a link between complement activation and the coagulation cascade.
- The findings highlight a potential mechanism connecting inflammatory pathways (via C5a) with the initiation of blood coagulation.
- Understanding this interplay may offer insights into thrombotic complications associated with inflammation.