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Biochem Biophys Res Commun. 2002 Jun 14;294(3):541-6.

Shear stress mediates tyrosylprotein sulfotransferase isoform shift in human endothelial cells.

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Max Planck Institute for Molecular Physiology, Otto-Hahn-Str. 11, D-44227 Dortmund, Germany.

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  • Biochem Biophys Res Commun 2002 Jul 26;295(4):1033.


In this study, we examined expression of tyrosylprotein sulfotransferase (TPST) isoforms TPST1 and TPST2 in primary cultures of human umbilical vein endothelial cells. For the first time coexpression of both isoforms is shown in primary human cells. Application of physiological levels of shear stress regulates expression of TPST isoforms in a time- and dose-dependent manner. Sustained application of arterial laminar shear stress causes downregulation of TPST1 mRNA and protein expression, while TPST2 is upregulated. This TPST isoform shift is mediated by different signaling pathways. Shear stress-dependent downregulation of TPST1 involves tyrosine kinase, while upregulation of TPST2 is mediated by a protein kinase C-dependent pathway [corrected].

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