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Caspase inhibitor Z-VAD-FMK potentiates heat shock-induced apoptosis and HSP70 synthesis in macrophages

I Yu Malyshev1, M G Pshennikova, M V Shimkovich

  • 1Institute of General Pathology and Pathophysiology, Russian Academy of Medical Sciences, Moscow, Russia. igor.malyshev@mtu-net.ru

Bulletin of Experimental Biology and Medicine
|January 25, 2005
PubMed

Insights

Caspase inhibitors enhance heat shock-induced apoptosis in macrophages by affecting Heat Shock Protein 70 (HSP70) accumulation. HSP70 is crucial for protecting macrophages from caspase-independent cell death.

Area of Science:

  • Cellular Biology
  • Immunology
  • Stress Response

Background:

  • Heat shock induces apoptosis in macrophages.
  • Heat Shock Protein 70 (HSP70) is a key cellular stress protein.
  • Caspases are critical mediators of programmed cell death.

Purpose of the Study:

  • To investigate the role of caspases and HSP70 in heat shock-induced apoptosis in macrophages.
  • To elucidate the interplay between caspase activity and HSP70 expression during cellular stress.

Main Methods:

  • Macrophages were treated with the caspase inhibitor Z-VAD-FMK and/or the HSP70 synthesis inhibitor quercetin.
  • Heat shock was applied to induce cellular stress.
  • Apoptosis, DNA fragmentation, and HSP70 synthesis/accumulation were assessed.

Main Results:

  • Caspase inhibition potentiated heat shock-induced apoptosis.
  • Z-VAD-FMK increased HSP70 synthesis intensity during heat shock but did not activate it independently.
  • Caspases may normally suppress HSP70 accumulation under heat stress.
  • Inhibition of HSP70 synthesis exacerbated DNA fragmentation in the presence of caspase inhibition and heat shock.

Conclusions:

  • HSP70 plays a protective role against caspase-independent apoptosis in macrophages.
  • Modulating caspase activity and HSP70 levels impacts macrophage survival under heat stress.
  • Understanding these pathways is vital for macrophage biology and stress response.

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