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Scanning Electron Microscopy of Macerated Tissue to Visualize the Extracellular Matrix
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Extracellular matrix proteins and matrix metalloproteinases differ between various right and left ventricular sites

E Herpel1, S Singer, C Flechtenmacher

  • 1Department of Pathology, University of Heidelberg, INF 220/1, 69120 , Heidelberg, Germany.

Virchows Archiv : an International Journal of Pathology
|April 5, 2005
PubMed

Insights

Extracellular matrix (ECM) protein and matrix metalloproteinase (MMP) distributions differ between the right and left ventricles in dilated cardiomyopathy (DCM) and ischemic cardiomyopathy (ICM). This suggests distinct ECM degradation patterns in each ventricle.

Area of Science:

  • Cardiovascular Biology
  • Cardiac Pathophysiology
  • Extracellular Matrix Research

Background:

  • The extracellular matrix (ECM) is crucial for cardiac structure and function.
  • Alterations in ECM composition and remodeling are implicated in heart failure.
  • Understanding regional differences in ECM is vital for comprehending cardiac disease.

Purpose of the Study:

  • To investigate site-specific differences in ECM protein and matrix metalloproteinase (MMP) distribution within the human heart.
  • To compare these distributions between dilated cardiomyopathy (DCM) and ischemic cardiomyopathy (ICM).

Main Methods:

  • Analysis of 33 explanted human hearts (15 DCM, 18 ICM).
  • Collection of transmural tissue samples from right ventricle, interventricular septum, and left ventricle (apex and base).
  • Immunohistochemistry and connective tissue staining for ECM proteins (collagens I, III, IV, laminin, fibronectin) and MMPs (MMP-1, -2, -9).

Main Results:

  • Significant differences in laminin (ICM) and fibronectin/collagen types I & IV (DCM) volume densities were observed between right and left ventricular sites.
  • ECM protein distribution showed limited variation within the left ventricle across tested sites in both DCM and ICM.
  • Matrix metalloproteinases (MMPs) exhibited some distribution differences between the right and left ventricular myocardium.

Conclusions:

  • The distribution of ECM proteins and MMPs varies between the right and left ventricles in end-stage DCM and ICM.
  • These findings support a hypothesis of distinct ECM degradation patterns in the right versus left ventricular myocardium.
  • Regional heterogeneity in ECM remodeling may contribute to differential ventricular function in heart failure.

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