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On-Chip Endothelial Inflammatory Phenotyping
12:43

On-Chip Endothelial Inflammatory Phenotyping

Published on: July 21, 2012

Thrombin promotes proinflammatory phenotype in human vascular smooth muscle cell

Sung-Woon Chung1, Jae-Woo Park, Sae-A Lee

  • 1Department of Thoracic and Cardiovascular Surgery, School of Medicine, Pusan National University, Busan, Republic of Korea.

Biochemical and Biophysical Research Communications
|May 11, 2010
PubMed

Insights

Thrombin signaling promotes a proinflammatory phenotype in human vascular smooth muscle cells (VSMC). This process involves key signaling pathways like PI3K/Akt, PKC, and MAPK, contributing to vascular inflammation.

Area of Science:

  • Vascular Biology
  • Cell Signaling
  • Immunology

Background:

  • Protease-activated receptor (PAR), the thrombin receptor, is upregulated in atherosclerotic plaques.
  • VSMC phenotypic switching to proinflammatory states is a hallmark of atherosclerosis.

Purpose of the Study:

  • To investigate if thrombin induces a proinflammatory phenotype in human aortic smooth muscle cells (HAoSMC).
  • To identify the signaling pathways mediating thrombin's effects on VSMC.

Main Methods:

  • Quantitative PCR to measure gene transcripts (IL-6, CXCL8, CCL11).
  • ELISA to quantify protein release of IL-6 and CXCL8.
  • Western blotting to assess activation of Akt, PKC, and MAPK.
  • Pharmacological inhibition of signaling pathways (PI3K, Akt, PKC, NADPH oxidase, MAPK).

Main Results:

  • Thrombin significantly increased IL-6, CXCL8, and CCL11 gene expression in HAoSMC.
  • Thrombin enhanced the release of IL-6 and CXCL8 proteins.
  • Thrombin activated Akt, PKC, and MAPK signaling pathways.
  • Inhibitors of PI3K/Akt, PKC, NADPH oxidase, and MAPK attenuated thrombin-induced IL-6 and CXCL8 production.

Conclusions:

  • Thrombin promotes a proinflammatory phenotype in human VSMC.
  • PI3K, Akt, PKC, NADPH oxidase, and MAPK signaling pathways are crucial mediators of thrombin's proinflammatory effects.
  • Thrombin-induced VSMC activation may exacerbate vascular inflammation following endothelial injury or thrombus formation.

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