摘要
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.
原文 | 英語 |
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頁(從 - 到) | 169-176 |
頁數 | 8 |
期刊 | Chinese Journal of Physiology |
卷 | 45 |
發行號 | 4 |
出版狀態 | 已發佈 - 12月 31 2002 |
對外發佈 | 是 |
ASJC Scopus subject areas
- 生理學
- 生理學(醫學)