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Caspase-3 Activity in the Rat Amygdala Measured by Spectrofluorometry After Myocardial Infarction
08:41

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Caspase-3-dependent apoptosis in vascular smooth muscle cell by proteasome inhibition

Sun Cheun Kim1, Mun-Chul Rho, Hyun Sun Lee

  • 1Drug & Toxicology Section, National Institute of Scientific Investigation Central District Office, Daejeon, Korea.

Journal of Cardiovascular Pharmacology
|September 26, 2003
PubMed

Insights

Proteasome inhibition with MG115 induces programmed cell death (apoptosis) in vascular smooth muscle cells (VSMCs). This process involves caspase-3 activation, offering potential therapeutic strategies for vascular restenosis.

Area of Science:

  • Molecular Biology
  • Cardiovascular Research
  • Cellular Biology

Background:

  • Vascular restenosis after angioplasty is a significant clinical challenge.
  • Proteasome inhibitors are being explored as a therapeutic strategy to prevent vascular restenosis.
  • The precise mechanisms of proteasome inhibition in vascular smooth muscle cells (VSMCs) remain unclear.

Purpose of the Study:

  • To investigate the effects of proteasome inhibition on VSMCs.
  • To elucidate the molecular mechanisms underlying proteasome inhibitor-induced apoptosis in VSMCs.

Main Methods:

  • VSMCs were treated with the proteasome inhibitor MG115.
  • Cell viability, morphology, and DNA fragmentation were assessed to determine apoptosis.
  • Protein levels of p53, p21, p27, Bcl-2, Bax, and caspase activity were analyzed.

Main Results:

  • MG115 induced apoptotic death in VSMCs.
  • Proteasome inhibition led to increased p53, p21, and p27 levels, but not Bcl-2 or Bax.
  • Apoptosis was mediated by the activation of caspase-3, not caspase-8, and was inhibited by a caspase-3 specific inhibitor.

Conclusions:

  • Proteasome inhibition triggers apoptosis in VSMCs.
  • The observed apoptosis is dependent on the activation of caspase-3.
  • These findings suggest proteasome inhibition as a potential therapeutic avenue for preventing vascular restenosis.

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