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Endothelial tissue factor stimulation by proteinase 3 and elastase.

M Haubitz1, M Gerlach, H J Kruse

  • 1Department of Nephrology, Medical School Hannover, Germany. Haubitz.Marion@MH-Hannover.de

Clinical and Experimental Immunology
|December 12, 2001
PubMed
Summary
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Proteinase 3 (PR3) and elastase, released during ANCA-associated vasculitis, increase tissue factor (TF) expression in endothelial cells. This suggests a role for these proteases in microthrombi formation and vascular damage.

Area of Science:

  • Immunology
  • Vascular Biology
  • Hematology

Background:

  • Autoantibodies activate leucocytes in ANCA-associated vasculitis, releasing proteases like MPO, PR3, and elastase.
  • The role of these proteases in stimulating procoagulant activity and contributing to vascular lesions is unclear.

Purpose of the Study:

  • To investigate the effect of MPO, PR3, and elastase on tissue factor (TF) expression and activity in human endothelial cells.
  • To determine the mechanisms underlying protease-induced TF stimulation.

Main Methods:

  • Human umbilical vein endothelial cells were stimulated with MPO, PR3, and elastase.
  • TF activity was measured using a one-stage clotting assay.
  • TF mRNA expression was detected via reverse transcriptase-polymerase chain reaction.

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Main Results:

  • PR3 and elastase significantly increased TF mRNA expression and activity in endothelial cells.
  • Elastase's effect was blocked by alpha-1-antitrypsin, indicating dependence on proteolytic activity.
  • PR3's stimulatory effect was independent of its proteolytic activity.
  • MPO had no significant effect on TF activity.

Conclusions:

  • PR3 and elastase stimulate TF expression in human endothelial cells.
  • Increased protease release in ANCA-associated vasculitis may promote microthrombi and necrosis via TF upregulation.