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Proteasome inhibitors sensitize human vascular smooth muscle cells to Fas (CD95)-mediated death

K Kim1

  • 1Department of Pathology, University of Washington, Seattle, Washington 98195, USA. koanhoi@u.washington.edu

Biochemical and Biophysical Research Communications
|February 22, 2001
PubMed

Insights

Proteasome activity is crucial for vascular smooth muscle cell (VSMC) survival. Inhibiting proteasomes enhances VSMC susceptibility to Fas-mediated death by influencing Fas signaling pathways.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Cardiovascular Research

Background:

  • Vascular smooth muscle cells (VSMCs) play a critical role in cardiovascular health.
  • Fas-mediated apoptosis is a key pathway regulating cell death.
  • The role of proteasome activity in VSMC susceptibility to Fas-mediated death remains unclear.

Purpose of the Study:

  • To investigate the role of proteasome activity in human VSMC susceptibility to Fas-mediated apoptosis.
  • To elucidate the mechanisms by which proteasome inhibition affects Fas signaling in VSMCs.

Main Methods:

  • Human fetal aorta smooth muscle cells were treated with agonistic anti-Fas antibody (CH11) and proteasome inhibitors (MG115 or MG132).
  • Cell death was assessed using morphology, viability assays, and DNA fragmentation analysis.
  • Western blotting was used to determine the expression levels of key proteins involved in apoptosis signaling.

Main Results:

  • Proteasome inhibition, in conjunction with anti-Fas antibody, induced VSMC death and DNA degradation, which was blocked by a caspase inhibitor.
  • Co-treatment with anti-Fas antibody and proteasome inhibitors activated caspase-3.
  • Proteasome inhibitors did not alter the expression of procaspase-8, procaspase-3, c-FLIP, or Bcl-2, but upregulated Fas and FADD expression.

Conclusions:

  • Proteasome activity is essential for VSMC survival.
  • This study provides the first evidence linking proteasome function to Fas signal transduction in VSMCs.
  • Novel mechanisms are proposed for VSMC susceptibility to Fas ligand-induced apoptosis under proteasome inhibition.

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