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Related Experiment Videos

Bone morphogenetic protein-2 induces proinflammatory endothelial phenotype.

Anna Csiszar1, Mansoor Ahmad, Kira E Smith

  • 1Department of Physiology, New York Medical College, Valhalla, New York 10595, USA.

The American Journal of Pathology
|January 27, 2006
PubMed
Summary

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Bone morphogenetic protein-2 (BMP-2) increases in atherosclerosis and promotes endothelial dysfunction. This study shows BMP-2 triggers oxidative stress and inflammatory responses in blood vessels, contributing to vascular disease.

Area of Science:

  • Cardiovascular Biology
  • Molecular Medicine
  • Endothelial Cell Biology

Background:

  • Bone morphogenetic protein-2 (BMP-2) is implicated in atherosclerosis, but its endothelial effects are unclear.
  • Endothelial cells express BMP-2 and BMP-4, with BMP-2 levels rising under inflammatory conditions.

Purpose of the Study:

  • To investigate the role of BMP-2 in endothelial dysfunction and vascular inflammation.
  • To elucidate the signaling pathways involved in BMP-2-induced endothelial activation.

Main Methods:

  • Utilized microdissected and cultured coronary arterial endothelial cells (CAECs).
  • Employed organ culture of rat carotid arteries and ex vivo assays.
  • Investigated molecular pathways including protein kinase C (PKC), NAD(P)H oxidase, nuclear factor-kappaB, and p42/44 MAP kinase (ERK-1/2).

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Main Results:

  • Proinflammatory stimuli (TNF-alpha, H2O2) increased endothelial BMP-2 expression.
  • BMP-2 impaired arterial relaxation, increased reactive oxygen species, and activated nuclear factor-kappaB.
  • BMP-2 and BMP-4 enhanced monocyte adhesion via p42/44 MAP kinase and PKC pathways.
  • BMP-2 induced p42/44 MAP kinase phosphorylation in endothelial cells and arteries.

Conclusions:

  • Endothelial BMP-2 expression is upregulated by inflammation.
  • Increased BMP-2 levels contribute to endothelial dysfunction, oxidative stress, and activation.
  • BMP-2's proinflammatory actions may drive vascular pathophysiology in atherosclerosis.