[Effect of tanshinone II A on NB4 cell induced procoagulant activity in human umbilical vein endothelial cells].

OBJECTIVE: To investigate the effect of tanshinone II A on the procoagulant activity (PCA) of human umbilical vein endothelial cells (HUVEC) induced by acute promyelocytic leukemia (APL) cell line NB4 cells. METHODS: The HUVEC were incubated for 6, 12, and 24 hours in different tanshinone II A conditioned medias (Tan II A-NB4-24h-CM, Tan II A-NB4-72h-CM, Tan II A-NB4-120h-CM). Then the HUVEC were incubated for 6, 12, 24, and 72 hours with Tan II A-NB4-120h-CM and different concentrations of Tan II A (0, 0.25, 0.5, 1.0 microg/mL). The HUVEC lysates were obtained by three repeated freezing and thrawing. Their PCA were tested using the one stage clotting assay. The activity of tissue factor (TF : act) was tested using the chromogenic substrate assay. The control groups included 0.3 microg/mL ATRA, 0.01% DMSO and RPMI 1640. RESULTS: Tan II A-(72 h,120 h)-NB4-CM elevated PCA of HUVEC and six hours of incubation in the 120 h-NB4-CM had the greatest PCA. The PCA of HUVEC in the 1.0 microg/mL Tan II A-NB4-CM was the same as in the 0.3 microg/mL ATRA-NB4-CM. (2) The NB4-CM induced PCA of HUVEC decreased with 5.0 microg/mL of Tan II A, at a level similar to the decrease with 0.3 microg/mL of ATRA. Less than 5.0 microg/mL of Tan II did not reduce the NB4-CM induced PCA of HUVEC. (3) Both Tan II A 120 h-NB4-CM and ATRA 120 h-NB4-CM elevated the TF : act of HUVEC. The TF : act reached the peak after 6 hours of incubation. The Tan II A 120 h-NB4-CM maintained the peak level of TF : act at the 12th hour and fell to the base line at the 24th hour. The ATRA 120 h-NB4-CM induced TF:act dropped down with time after reaching its peak at the 6th hour. (4) The 1.0 microg/mL of Tan II A did not reduce the TF : act of HUVEC induced by the Tan II A 120 h-NB4-CM. But the 0.3 microg/mL of ATRA reduced the TF : act of HUVEC at the 6th hour. CONCLUSION: TanIIA-NB4-CM increases PCA and TF : Act of HUVEC. TanIIA decreases PCA of HUVECs induces by TanIIA-NB4-CM.