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Related Experiment Videos

Actin is cleaved during constitutive apoptosis

S B Brown1, K Bailey, J Savill

  • 1Division of Renal and Inflammatory Disease, Department of Medicine, University Hospital, Nottingham NG7 2UH, UK.

The Biochemical Journal
|April 1, 1997
PubMed
Summary

Neutrophils undergoing apoptosis cleave membrane-associated actin, a key cytoskeletal component. This cleavage, mediated by calpains, not ICE-like proteases, may reduce neutrophil injury during cell death.

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Area of Science:

  • Cell Biology
  • Biochemistry
  • Immunology

Background:

  • Proteases are crucial in apoptosis, yet specific substrates remain largely unknown, especially in constitutive apoptosis.
  • Neutrophils undergo spontaneous apoptosis in culture, providing a model for studying this process without external stimuli.

Purpose of the Study:

  • To identify substrates cleaved during constitutive neutrophil apoptosis.
  • To investigate the role of specific proteases, including ICE-like proteases and calpains, in the cleavage of membrane-associated actin.

Main Methods:

  • Biochemical and immunochemical analyses were employed to detect and characterize protein cleavage.
  • Inhibitors of ICE-like proteases (zVAD-fmk) and calpains (acetyl-leucyl-leucylnormethional) were used to determine protease involvement.

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Main Results:

  • Evidence of membrane-associated actin cleavage was found during spontaneous neutrophil apoptosis.
  • Actin cleavage occurred at a single N-terminal site, lacking consensus motifs for ICE-family proteases.
  • Calpain inhibition completely blocked actin cleavage, while ICE-like protease inhibition only partially reduced it, suggesting calpains are the primary enzymes involved.

Conclusions:

  • Actin is cleaved during neutrophil apoptosis, but not directly by ICE-like proteases.
  • Calpains, rather than ICE-like proteases, are responsible for actin cleavage in this context.
  • Actin cleavage likely contributes to apoptosis by disabling the cytoskeleton, thereby reducing the potential for neutrophil-induced injury.