Shear stress attenuates tumor necrosis factor-α-induced monocyte chemotactic protein-1 expressions in endothelial cells

Jeng Jiann Chiu, Pei Ling Lee, Chih I. Lee, Li Jing Chen, Cheng Nan Chen, Ya Chen Ko, Sheng Chieh Lien

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7 Citations (Scopus)

Abstract

The interplay between shear stress and cytokines in regulating vascular endothelial function remains largely unexplored. In the present study, the potential role of shear stress in regulating tumor necrosis factor-α (TNF-α)-induced gene expression in endothelial cells (ECs) was investigated. The TNF-α-induced monocyte chemotactic protein-1 (MCP-1) mRNA expressions were significantly attenuated in ECs subjected to a high level of shear stress (20 dynes/cm 2 ) for 4 or 24 h prior to the addition of TNF-α in the presence of flow. Less inhibition of TNF-α-induced MCP-1 mRNA expression was found in ECs pre-exposed to a low level of shear stress (1.2 dynes/cm 2 ) for 24 h as compared with the cells presheared (pre-exposed to shear stress) for 4 h. Simultaneous exposure of ECs to TNF-α and a high or low level of shear stress down-regulated TNF-α-induced MCP-1 gene expressions, suggesting that the post-flow condition modulates endothelial responses to cytokine stimulation. Individually or combined, an endothelial nitric oxide synthase (eNOS) inhibitor and a glutathione (GSH) biosynthesis inhibitor had no effect on this shear stress-mediated inhibition. Moreover, in ECs either presheared or remained in a static condition prior to stimulation by TNF-α while under shear flow, the ability of TNF-α to induce AP-1-DNA binding activity in the nucleus was reduced. Our findings suggest that shear stress plays a protective role in vascular homeostasis by inhibiting endothelial responses to cytokine stimulation.

Original languageEnglish
Pages (from-to)169-176
Number of pages8
JournalChinese Journal of Physiology
Volume45
Issue number4
Publication statusPublished - Dec 31 2002
Externally publishedYes

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Keywords

  • Cytokine
  • Endothelial cell
  • Monocyte chemotactic protein
  • Shear stress

ASJC Scopus subject areas

  • Physiology
  • Physiology (medical)

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