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Related Experiment Videos

Vitronectin decreases microvascular endothelial cell apoptosis

F F Isik1, N S Gibran, Y C Jang

  • 1Department of Surgery, University of Washington Medical Center, Seattle, USA. isik@u.washington.edu

Journal of Cellular Physiology
|April 3, 1998
PubMed
Summary

Vitronectin significantly reduces microvascular endothelial cell death during angiogenesis by interacting with alpha(v) integrin receptors. This finding identifies a key mechanism promoting tissue repair after injury.

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Area of Science:

  • Biomedical Engineering
  • Cell Biology
  • Biochemistry

Background:

  • Angiogenesis, the formation of new blood vessels, is crucial for tissue repair following injury.
  • This process occurs within an extracellular matrix (ECM) environment, where interactions between ECM molecules and cell surface integrin receptors are vital.
  • Specific integrin receptors, such as alpha(v)beta3 and alpha(v)beta5, play a critical role in angiogenesis, but the specific ECM ligands involved remain unidentified.

Purpose of the Study:

  • To investigate the role of provisional matrix molecules in promoting angiogenesis.
  • To identify the specific extracellular matrix (ECM) component that reduces microvascular endothelial cell (MEC) apoptosis.
  • To elucidate the integrin receptor interactions involved in vitronectin-mediated reduction of MEC apoptosis.

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Main Methods:

  • Cultured human microvascular endothelial cells (MECs) were used to assess cell death.
  • MECs were cultured on various substrates including vitronectin, fibronectin, fibrinogen plus thrombin, collagen I, and collagen IV.
  • Cell death was quantified using morphological assessment, TdT-mediated dUTP nick end labeling (TUNEL) assay, and measurement of histone and thymidine release.

Main Results:

  • Vitronectin significantly reduced MEC death in vitro compared to other tested matrix molecules.
  • This anti-apoptotic effect of vitronectin was observed across multiple assays measuring cell death.
  • Data suggest that while vitronectin may interact with multiple integrin receptors, the alpha(v) component is critical for reducing MEC apoptosis.

Conclusions:

  • Vitronectin is a key provisional matrix molecule that promotes angiogenesis by reducing microvascular endothelial cell apoptosis.
  • The anti-apoptotic effect of vitronectin is mediated, at least in part, through its interaction with the alpha(v) integrin component.
  • Understanding these interactions provides insights into therapeutic strategies for promoting tissue repair and angiogenesis.