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Small stress proteins: chaperones that act as regulators of intracellular redox state and programmed cell death

A P Arrigo1

  • 1Laboratoire du Stress Cellulaire, Centre de Génétique Moléculaire et Cellulaire, CNRS UMR-5534, Claude Bernard University, Villeurbanne, France.

Biological Chemistry
|March 21, 1998
PubMed

Insights

Small heat shock proteins (sHsp) protect mammalian cells from various injuries, including oxidative stress and apoptosis. These molecular chaperones are crucial for cell survival during differentiation and other stress conditions.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Small heat shock proteins (sHsp) are molecular chaperones.
  • sHsp expression enhances survival against various cell death-inducing injuries.
  • These injuries include heat shock, oxidative stress, and anti-cancer agents.

Purpose of the Study:

  • To summarize recent findings on the protective role of sHsp against programmed cell death.
  • To highlight the mechanisms and contexts of sHsp-mediated cytoprotection.

Main Methods:

  • Review of recent research on small heat shock proteins.
  • Analysis of studies investigating sHsp's role in cell survival under stress.
  • Examination of sHsp's involvement in apoptosis pathways.

Main Results:

  • sHsp enhance cell survival during oxidative stress by reducing reactive oxygen species via a glutathione-dependent mechanism.
  • sHsp provide protection against apoptosis induced by agents like staurosporine, etoposide, and Fas ligand.
  • Transient sHsp expression is essential for preventing apoptosis in differentiating cells.

Conclusions:

  • Small heat shock proteins are key regulators of programmed cell death.
  • sHsp interfere with multiple apoptosis pathways, offering broad cytoprotective effects.
  • sHsp play a critical role in cell survival during differentiation.

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