Effects of TNF-α and curcumin on the expression of thrombomodulin and endothelial protein C receptor in human endothelial cells

Bicheng Nan, Peter Lin, Alan B. Lumsden, Qizhi Yao, Changyi Chen

Research output: Contribution to journalArticle

68 Scopus citations

Abstract

The objective of this study was to elucidate the effects of tumor necrosis factor-alpha (TNF-α) on the expression of thrombomodulin (TM) and endothelial protein C receptor (EPCR) in human endothelial cells as well as the effect of curcumin, a spice and coloring food compound, as a potential therapeutic agent. Human umbilical vein endothelial cells (HUVECs) treated with TNF-α (2.0 ng/ml) showed reduced TM mRNA levels by 80%, 97%, 94%, and 97% at 3, 6, 12, and 24 h, respectively (P<0.05), by real-time PCR analysis. Dose-dependent study showed that TM mRNA levels of HUVECs were decreased by 86%, 89%, 91%, and 94% after treatment of TNF-α (0, 0.25, 0.5, 1, and 2 ng/ml) for 6 h, respectively (P<0.05). TM protein levels in HUVECs were significantly reduced by 69% in TNF-α-treated cells as compared to controls (P<0.05) by Western blot analysis. Secreted protein and activity of TM of HUVEC cultures were also significantly reduced in TNF-α-treated cells. In addition, EPCR mRNA levels of HUVECs were significantly reduced in TNF-α-treated group as compared to controls (P<0.05). Furthermore, these effects were observed in other types of endothelial cells from human coronary arteries, lung, and skin. Curcumin effectively blocked these effects of TNF-α on downregulation of TM and EPCR. These data demonstrate that TNF-α significantly decreases expression of TM and EPCR at both mRNA and protein levels in several human endothelial cells. Curcumin can effectively block TNF-α-induced endothelial dysfunction. This study suggests a new molecular mechanism of inflammation-induced thrombosis and a new therapeutic strategy to prevent this clinical problem.

Original languageEnglish (US)
Pages (from-to)417-426
Number of pages10
JournalThrombosis Research
Volume115
Issue number5
DOIs
StatePublished - 2005

Keywords

  • Antioxidant
  • Curcumin
  • Endothelial cell
  • Endothelial protein C receptor
  • Inflammation
  • Thrombomodulin
  • TNF-α

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine
  • Hematology

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