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Cause or effect of arteriogenesis: compositional alterations of microparticles from CAD patients undergoing external

Ali Al Kaabi1, Tobias Traupe, Monika Stutz

  • 1Department of Clinical Research, University of Bern, Bern, Switzerland.

Plos One
|October 12, 2012
PubMed

Insights

High-pressure external counterpulsation (ECP) therapy in coronary artery disease (CAD) patients increases platelet-derived microparticles (MPs), promoting blood vessel growth. This study investigated the molecular mechanisms behind ECP-induced arteriogenesis.

Area of Science:

  • Cardiovascular Research
  • Molecular Biology
  • Biochemistry

Background:

  • Stable coronary artery disease (CAD) patients were studied.
  • External counterpulsation therapy (ECP) at high inflation pressure (300 mmHg) promoted coronary collateral growth, unlike low pressure (80 mmHg).
  • The molecular mechanisms of shear stress-induced arteriogenesis remain unclear.

Purpose of the Study:

  • To characterize plasma circulating microparticles (MPs) in CAD patients undergoing ECP.
  • To investigate the role of MPs in shear stress-induced arteriogenesis.
  • To elucidate the molecular changes in MPs following ECP therapy.

Main Methods:

  • Flow cytometry was used to analyze MP surface markers (Annexin V, CD31CD41, CD62E, CD146, CD14).
  • Collateral flow index (CFI) was measured to assess collateral growth.
  • Label-free proteomics identified 1005 proteins in MPs from ECP-treated patients.

Main Results:

  • High-pressure ECP significantly increased Annexin V and CD31CD41 positive MPs.
  • Changes in CD31CD41 MPs inversely correlated with CFI in the high-pressure group.
  • Proteomic analysis revealed increased cellular proteins, CD31, and transforming growth factor beta-1 in MPs post-ECP.

Conclusions:

  • ECP therapy, particularly at high inflation pressure, increases platelet-derived MPs in CAD patients.
  • The altered protein cargo of MPs suggests a pro-angiogenic and arteriogenic effect.
  • These findings provide insights into the molecular mechanisms of ECP-mediated vascular growth.
Abstract

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