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Application of Unsupervised Multi-Omic Factor Analysis to Uncover Patterns of Variation and Molecular Processes Linked to Cardiovascular Disease
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Proteomic profiling of acute coronary thrombosis reveals a local decrease in pigment epithelium-derived factor in

Klaus Distelmaier1, Christopher Adlbrecht, Johannes Jakowitsch

  • 1Department of Internal Medicine II, Division of Cardiology, Medical University of Vienna, Vienna, Austria.

Clinical Science (London, England : 1979)
|February 10, 2012
PubMed

Insights

Researchers found that pigment epithelium-derived factor (PEDF), an anti-thrombotic protein, is decreased at culprit sites of acute myocardial infarction. This decrease is linked to increased proteolytic activity and matrix metalloproteinase-9 (MMP-9) activity, suggesting a role in coronary plaque rupture.

Area of Science:

  • Cardiovascular Biology
  • Proteomics
  • Molecular Medicine

Background:

  • Atherosclerotic plaque rupture leading to coronary artery thrombosis is the primary cause of acute myocardial infarction (AMI).
  • The exact molecular mechanisms driving acute coronary occlusion remain incompletely understood.
  • Understanding these mechanisms is crucial for developing targeted therapies for ST-segment elevation myocardial infarction (STEMI).

Purpose of the Study:

  • To investigate the proteomic differences between systemic plasma and plasma at the culprit site of coronary plaque rupture in STEMI patients.
  • To identify key proteins and pathways involved in the pathophysiology of acute coronary occlusion.
  • To explore the role of pigment epithelium-derived factor (PEDF) in the context of coronary plaque rupture and atherothrombosis.

Main Methods:

  • Proteomic analysis using label-free quantification of MS/MS data on plasma samples from STEMI patients.
  • Comparison of proteomic profiles from systemic circulation versus plasma directly from the culprit site (CS) of plaque rupture.
  • Assay of proteolytic activity and matrix metalloproteinase-9 (MMP-9) activity in CS plasma.
  • Proteomic analysis of coronary thrombus aspirates.

Main Results:

  • Differential regulation of complement cascade components was observed between CS and systemic plasma.
  • A significant decrease in anti-thrombotic pigment epithelium-derived factor (PEDF) was detected in CS plasma compared to systemic plasma.
  • PEDF levels at the culprit site showed an inverse correlation with local matrix metalloproteinase-9 (MMP-9) activity.
  • CS plasma exhibited enhanced proteolytic activity targeting PEDF, suggesting local processing.
  • Proteomic analysis of thrombus aspirates indicated that PEDF processing is associated with coronary plaque rupture.

Conclusions:

  • The study identifies a localized decrease and enhanced proteolytic processing of PEDF at the culprit site in STEMI patients.
  • Reduced PEDF levels and increased local proteolytic activity, particularly MMP-9, may contribute to atherothrombosis and plaque rupture.
  • These findings highlight PEDF as a potential therapeutic target for managing acute myocardial infarction.

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