Fluid Shear Stress Increases the Intra-cellular Storage Pool of Tissue-type Plasminogen Activator in Intact Human Conduit Vessels

Lena Selin Sjögren; Liming Gan; Roya Doroudi; Christina Jern; Lennart Jungersten; Sverker Jern

doi:10.1055/s-0037-1614010

Thrombosis and Haemostasis, Table of Contents

Thromb Haemost 2000; 84(02): 291-298
DOI: 10.1055/s-0037-1614010

Review Article

Schattauer GmbH

Fluid Shear Stress Increases the Intra-cellular Storage Pool of Tissue-type Plasminogen Activator in Intact Human Conduit Vessels

Lena Selin Sjögren

¹From the Clinical Experimental Research Laboratory, Heart and Lung Institute, Sahlgrenska University Hospital/Östra, Göteborg University, Göteborg, Sweden

,

Liming Gan

¹From the Clinical Experimental Research Laboratory, Heart and Lung Institute, Sahlgrenska University Hospital/Östra, Göteborg University, Göteborg, Sweden

,

Roya Doroudi

¹From the Clinical Experimental Research Laboratory, Heart and Lung Institute, Sahlgrenska University Hospital/Östra, Göteborg University, Göteborg, Sweden

,

Christina Jern

¹From the Clinical Experimental Research Laboratory, Heart and Lung Institute, Sahlgrenska University Hospital/Östra, Göteborg University, Göteborg, Sweden

,

Lennart Jungersten

¹From the Clinical Experimental Research Laboratory, Heart and Lung Institute, Sahlgrenska University Hospital/Östra, Göteborg University, Göteborg, Sweden

,

Sverker Jern

¹From the Clinical Experimental Research Laboratory, Heart and Lung Institute, Sahlgrenska University Hospital/Östra, Göteborg University, Göteborg, Sweden

› Author Affiliations

Abstract

Summary

We investigated the effect of shear stress on the expression of tissuetype plasminogen activator (t-PA) in intact human conduit vessels. Human umbilical veins were exposed to high or low shear stress (25 vs < 4 dyn/cm²) at identical intraluminal pressure (20 mmHg) for 1.5, 3, and 6 h in a new computerized biomechanical perfusion system. High shear perfusion induced a marked, time-dependent increase in t-PA immunostaining in both the endothelium and the media. t-PA relative to GAPDH gene expression increased by 54 ± 14% in highcompared to low-sheared vessels (p = 0.002). By contrast, t-PA release into the perfusion medium was similar in vessels perfused under high or low shear stress conditions. The results show that shear stress independently of pressure is a potent fluid mechanical stimulus for upregulation of the intracellular storage pool of t-PA in the vascular wall of fresh human conduit vessels. The shear effect is associated with an increased t-PA gene expression.

Keywords

t-PA - shear stress - endothelium - immunohistochemistry - gene expression

Full Text

References

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