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A Human Ex Vivo Atherosclerotic Plaque Model to Study Lesion Biology
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Apoptosis in atherogenesis: implications for plaque destabilization

M M Kockx1, A G Herman

  • 1Department of Pathology, AZ-Middleheim, Antwerp, Belgium.

European Heart Journal
|August 26, 1998
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Summary
This summary is machine-generated.

Smooth muscle cell (SMC) apoptosis weakens atherosclerotic plaques, while macrophage apoptosis stabilizes them. Understanding these cell death pathways is crucial for managing atherosclerosis progression and calcification.

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Area of Science:

  • Cardiovascular Biology
  • Cellular Pathology
  • Atherosclerosis Research

Background:

  • Atherosclerotic plaques contain lipids and a fibrous cap, with smooth muscle cells (SMCs) vital for collagen synthesis and cap integrity.
  • Loss of SMCs in the fibrous cap compromises plaque stability due to reduced collagen production.
  • Apoptotic cell death in plaques, particularly SMCs and macrophages, is increasingly recognized as a key factor in atherosclerosis progression.

Purpose of the Study:

  • To investigate the distinct roles of smooth muscle cell (SMC) and macrophage apoptosis in atherosclerotic plaque stability and progression.
  • To clarify the impact of SMC loss on fibrous cap integrity and the potential for plaque calcification.
  • To differentiate the consequences of SMC versus macrophage apoptosis in the context of atherosclerotic disease.

Main Methods:

  • Review of current literature on apoptotic cell death in atherosclerotic plaques.
  • Analysis of the specific contributions of smooth muscle cells (SMCs) and macrophages to plaque pathology.
  • Examination of the mechanisms by which apoptotic cell remnants influence plaque calcification.

Main Results:

  • Increased SMC apoptosis in vulnerable plaque regions weakens the fibrous cap, increasing rupture risk.
  • Macrophage apoptosis contributes to plaque stabilization by reducing collagen degradation.
  • Remnants of apoptotic SMCs can form matrix vesicles, potentially initiating plaque calcification.

Conclusions:

  • Differential apoptosis of SMCs and macrophages significantly impacts atherosclerotic plaque stability and progression.
  • Targeting SMC apoptosis may be detrimental, while promoting macrophage apoptosis could be beneficial for plaque stabilization.
  • Apoptotic cell remnants, particularly from SMCs, represent a potential mechanism for atherosclerotic calcification.