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Related Experiment Videos

Apoptosis and keratin intermediate filaments.

R G Oshima1

  • 1Cancer Research Center, The Burnham Institute, La Jolla, CA 92037, USA. rgoshima@burnham.org

Cell Death and Differentiation
|April 26, 2002
PubMed
Summary

Intermediate filament (IF) proteins, like keratins, provide structural support. Emerging research reveals keratin 8

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Area of Science:

  • Cell Biology
  • Biochemistry
  • Molecular Biology

Background:

  • Intermediate filament (IF) proteins form polymeric fibers, with keratins being the largest group, primarily serving structural roles in hair and epidermis.
  • Intracellular keratins strengthen epithelial sheets, and IF proteins are typically cleaved by caspases during apoptosis for cellular component disposal.

Purpose of the Study:

  • To explore the dual role of keratins in apoptosis, considering both their degradation and potential protective functions.
  • To investigate the involvement of keratin 8 in tumor necrosis factor (TNF) and Fas-mediated apoptotic signaling pathways.

Main Methods:

  • Review of recent studies examining keratin function during apoptosis.
  • Analysis of evidence for keratin involvement both upstream and downstream of apoptotic signaling.

Main Results:

  • While IF proteins, including keratins, are generally cleaved by caspases during apoptosis, keratin 8 exhibits an unexpected protective role.
  • Keratin 8's function during TNF and Fas-mediated apoptosis suggests roles beyond simple structural breakdown.

Conclusions:

  • Keratins possess multifaceted roles in cellular processes, extending to the regulation of apoptosis.
  • Further research is warranted to fully elucidate the protective mechanisms of keratin 8 in apoptotic signaling.

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