Hemodynamic forces modulate the effects of cytokines on fibrinolytic activity of endothelial cells

Yohko Kawai, Yutaka Matsumoto, Kiyoaki Watanabe, Hiroshi Yamamoto, Kumi Satoh, Mitsuru Murata, Makoto Handa, Yasuo Ikeda

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72 Citations (Scopus)


We investigated the effects of hemodynamic force on fibrinolytic activity of cultured human umbilical vein endothelial cells stimulated by cytokines, using a modified cone-plate viscometer in which well-controlled and -defined sheer forces were generated. Treatment of the cells with interleukin (IL)-β or tumor necrosis factor α (TNFα) under static conditions had no effect on tissue plasminogen activator (t-PA) secretion, while release of plasminogen activator inhibitor-1 (PAI-1) increased. When cells were exposed to increasing shear stress up to 24 dynes/cm2, levels of t-PA and t-PA/PAI-1 complex significantly increased relative to shear stress, while total PAI-1 and active PAI-1 secretion decreased gradually. In the presence of IL-1β or TNFα, the increase in production of t-PA and the t-PA/PAI-1 complex was further augmented. Dot blot hybridization analysis of cultured cells in similar experimental conditions using t-PA and PAI-1 cDNA probes revealed no t-PA mRNA in 3 μg total RNA from static endothelial cells under resting or cytokine-stimulated conditions, but abundant t-PA mRNA was detected in cells subjected to a shear force of 18 dynes/cm2, and the increase was further augmented by addition of cytokines. In contrast, PAI-1 mRNA was detected in resting and cytokine-stimulated, nonsheared endothelial cells, but levels decreased after exposure to shear stress, even in the presence of cytokines. These results indicate a role for hemodynamic forces in regulating fibrinolytic activity with or without cytokine stimulation.

Original languageEnglish
Pages (from-to)2314-2321
Number of pages8
Issue number6
Publication statusPublished - 1996 Mar 15

ASJC Scopus subject areas

  • Biochemistry
  • Immunology
  • Hematology
  • Cell Biology


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