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Caveolar compartmentation of caspase-3 in cardiac endothelial cells

Brian C Oxhorn1, Iain L O Buxton

  • 1Department of Pharmacology, University of Nevada School of Medicine, 1664 North Virginia Street, Reno, NV 89557-0046, USA.

Cellular Signalling
|March 18, 2003
PubMed

Insights

This study reveals that caspase-3, a key enzyme in apoptosis, is located within caveolae in cardiac endothelial cells. Disrupting these caveolar domains alters caspase-3 activity, suggesting their role in regulating cell death signaling.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Cardiovascular Research

Background:

  • Endothelial cell apoptosis is crucial for vascular homeostasis, influenced by factors like angiostatin, reactive oxygen species (ROS), and cocaine.
  • Caspase activation is a hallmark of apoptosis, and caveolar domains are hypothesized to play a role in mediating these signaling events.

Purpose of the Study:

  • To investigate the hypothesis that caveolar domains mediate apoptotic signaling in cardiac endothelial cells.
  • To determine the localization and activity of caspase-3 within caveolae.

Main Methods:

  • Co-purification of caspase-3 proenzyme and its activated form with low-density, caveolin-enriched microdomains.
  • Fluorescent microscopy to localize caspase-3 within caveolae in intact cardiac endothelial cells.
  • Assessing the impact of caveolae disruption on caspase-3 enzyme activity.

Main Results:

  • Caspase-3 proenzyme (32 kDa) and its activated form (17 kDa) were found to co-purify with caveolin-enriched microdomains.
  • Caspase-3 was localized with caveolae in intact cells.
  • Disruption of caveolae led to observable temporal and spatial changes in caspase-3 enzyme activity.

Conclusions:

  • Caveolar domains are involved in the localization and regulation of caspase-3 activity in cardiac endothelial cells.
  • The co-purification of activated caspase-3 with caveolae suggests a potential role for sarcolemmal caspase-3 in targeting plasma membrane-associated substrates.
  • These findings offer new insights into the subcellular mechanisms of endothelial cell apoptosis.

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