Dec 1, 1985

Thrombin stimulates the adherence of neutrophils to human endothelial cells in vitro

The Journal of Clinical Investigation
Guy A ZimmermanS M Prescott


Highly purified human thrombin stimulates the adherence of polymorphonuclear leukocytes (PMNs) to vascular endothelial cells (EC). When Indium-labeled PMNs were incubated with primary monolayers of cultured human umbilical vein EC, the basal adherence was 10 +/- 1% of the PMNs at 5 min. Addition of thrombin (2 U/ml) increased the mean adherence to 42 +/- 15%. Enhanced neutrophil adherence in response to thrombin was confirmed by experiments with unlabeled leukocytes, examined by phase contrast and scanning electron microscopy. The action of thrombin was on the EC, since it did not directly stimulate PMN adhesiveness when measured by aggregation or by adherence to nylon fiber columns. Furthermore, enhanced neutrophil adherence occurred when endothelial monolayers were treated with thrombin and washed before adding 111Indium (111In)-labeled PMNs. Thrombin that had been inactivated with antithrombin III and heparin did not enhance neutrophil adherence. Prothrombin, Factor Xa, and fibrinogen were also ineffective. The stimulated adherence of PMNs was maximal 5 min after incubation of the EC with thrombin, and decreased thereafter. The response was dose-dependent, with half-maximal stimulation at 0.2-0.25 U thrombin/ml. The enhanced...Continue Reading

Mentioned in this Paper

Antithrombin III, Human
Neutrophil Band Cells
Clotting Factor II Assay
Fibrinogen Assay
Vascular Endothelial Cells
F2 gene
Neutrophils as Percentage of Blood Leukocytes (Lab Test)

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