Factor Xa generation on the surface of HUVECs
HUVECs were preincubated with indicated concentrations of
curcumin or BDMC for 10 min. TNF-α (10 ng/ml for 6 h in
serum-free medium) stimulated confluent monolayers of
HUVECs in a 96-well culture plate were incubated with FVIIa
(10 nM) in buffer B for 5 min at 37°C in presence or absence
of anti-TF IgG (25 μg/ml). FX (175 nM) was then added to the
cells (final reaction mixture volume, 100 μl) and incubated for
15 min. The reaction was stopped by adding buffer A containing
10 mM EDTA and the amount of FXa generated in the reaction
period was measured by using a chromogenic substrate,
and the change in absorbance at 405 nm was monitored in a
microplate reader for 2 min. The initial rate of color development
was converted into FXa concentrations from a standard
curve prepared with known dilutions of purified human FXa.