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Cytoskeletal actin degradation induced by lovastatin in cardiomyocytes is mediated through caspase-2

Jennifer Y Kong1, Simon W Rabkin

  • 1University of British Columbia, Room D404, 2733 Heather Street, Vancouver, B.C. V5Z 3J5, Canada.

Cell Biology International
|November 26, 2004
PubMed

Insights

Lovastatin causes cytoskeletal actin fragmentation via caspase-2, not caspase-3. This effect, linked to the mevalonate pathway, highlights a new connection between actin and caspase-2 in heart cells.

Area of Science:

  • Cell Biology
  • Biochemistry
  • Cardiovascular Research

Background:

  • Cytoskeletal actin integrity is crucial for cellular structure and function.
  • Caspases are key mediators of apoptosis, but their roles in non-apoptotic cellular processes are increasingly recognized.
  • Lovastatin, a cholesterol-lowering drug, has known cellular effects beyond lipid metabolism.

Purpose of the Study:

  • To investigate the role of caspase-2 in lovastatin-induced cytoskeletal actin fragmentation.
  • To compare the involvement of caspase-2 versus caspase-3 in this process.
  • To explore the link between the mevalonate pathway and actin fragmentation.

Main Methods:

  • Cultured embryonic chick cardiomyocytes.
  • F-actin visualization using NBD-phallacidin staining.
  • Quantification of F-actin loss via Fluorescence-Activated Cell Sorting (FACS) analysis.
  • Treatment with lovastatin, palmitate, caspase-2 inhibitor (z-VDVAD-fmk), and caspase-3 inhibitor (Ac-DEVD-CHO).
  • Assessment of mevalonate's effect on actin fragmentation.

Main Results:

  • Lovastatin induced a dose-dependent loss of F-actin in cardiomyocytes.
  • This actin fragmentation was specifically mediated by caspase-2, as a caspase-2 inhibitor blocked the effect, while a caspase-3 inhibitor did not.
  • Palmitate, an apoptotic stimulus, did not cause similar F-actin changes.
  • Interruption of the mevalonate pathway contributed to lovastatin's action, with mevalonate partially reversing the actin fragmentation.

Conclusions:

  • Cytoskeletal actin fragmentation by lovastatin is mediated through a caspase-2-dependent pathway.
  • This study reveals a novel link between cytoskeletal actin dynamics and caspase-2 activation.
  • The mevalonate pathway plays a partial role in lovastatin's effects on cellular actin.

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