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Cytokine stimulated vascular cell adhesion molecule-1 (VCAM-1) ectodomain release is regulated by TIMP-3

Robert J R Singh1, Justin C Mason, Elaine A Lidington

  • 1School of Biological Sciences, University of East Anglia, Norwich, NR4 7TJ, UK.

Cardiovascular Research
|June 14, 2005
PubMed

Insights

Tissue inhibitor of metalloproteinase-3 (TIMP-3) regulates soluble VCAM-1 release from cytokine-stimulated endothelial cells. This shedding process is mediated by the metalloproteinase ADAM17, offering insights into inflammatory disease mechanisms.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Immunology

Background:

  • Vascular cell adhesion molecule-1 (VCAM-1) is crucial in leukocyte recruitment during atherosclerosis pathogenesis.
  • Soluble VCAM-1 (sVCAM-1) release increases in cardiovascular and inflammatory diseases.
  • Mechanisms of sVCAM-1 generation under cytokine stimulation require investigation.

Purpose of the Study:

  • To investigate the mechanisms regulating soluble VCAM-1 (sVCAM-1) generation.
  • To determine the role of specific proteases and inhibitors in sVCAM-1 release.
  • To elucidate the signaling pathways involved in cytokine-induced sVCAM-1 shedding.

Main Methods:

  • Endothelial cells (MCEC-1 and primary aortic explants) were stimulated with TNFα, IL-1β, or PMA.
  • VCAM-1 ectodomain release was quantified using ELISA and Western blot.
  • Protease gene expression was modulated using siRNA, and TIMP-3 knockout cells were utilized.

Main Results:

  • Proinflammatory cytokines increased VCAM-1 ectodomain release, dependent on p38 and MAP kinases.
  • TIMP-3 significantly inhibited VCAM-1 shedding, while TIMP-1 and TIMP-2 had no effect.
  • ADAM17 knockdown reduced cytokine-stimulated VCAM-1 shedding, but ADAM10 and ADAM12 did not.

Conclusions:

  • TIMP-3 plays a regulatory role in the release of sVCAM-1 from endothelial cells.
  • The metalloproteinase ADAM17 is identified as a key mediator of cytokine-induced sVCAM-1 shedding.
Abstract

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