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Preparation of Peripheral Blood Mononuclear Cell Pellets and Plasma from a Single Blood Draw at Clinical Trial Sites for Biomarker Analysis
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Proteasome inhibition protects human peripheral blood mononuclear cells from radiation-induced oxidative stress

Katia Stankova1, Katia Ivanova, Vladimir Nikolov

  • 1National Center of Radiobiology and Radiation Protection, 1606 Sofia, Bulgaria.

International Journal of Radiation Biology
|March 15, 2013
PubMed
Abstract

Insights

Proteasome inhibitors like MG132, lactacystin, and celastrol boost antioxidant enzymes and heat shock protein 70 in human cells. This response protects against ionizing radiation damage.

Area of Science:

  • Cellular and Molecular Biology
  • Radiation Biology
  • Biochemistry

Background:

  • Ionizing radiation induces oxidative stress and cellular damage.
  • Proteasome inhibitors are known to modulate cellular stress responses.
  • Understanding cellular defense mechanisms against radiation is crucial.

Purpose of the Study:

  • To investigate the effects of proteasome inhibitors (MG132, lactacystin, celastrol) on antioxidant enzymes and heat shock proteins in irradiated human peripheral blood mononuclear cells (PBMC).
  • To assess the protective role of these inhibitors against radiation-induced cellular damage.

Main Methods:

  • Western blot analysis to determine protein levels of MnSOD, catalase, GST-π, and Hsp70.
  • Colorimetric and fluorescence assays to measure cellular viability, proteasome activity, oxidative stress, and apoptosis.
  • Exposure of human PBMC to ionizing radiation and treatment with proteasome inhibitors.

Main Results:

  • MG132 and lactacystin increased intracellular Hsp70 levels.
  • MG132 and celastrol upregulated MnSOD, while MG132 and lactacystin upregulated GST-π.
  • Proteasome inhibitors reduced oxidative species and modulated protein levels in irradiated cells.
  • Combined radiation and proteasome inhibition led to dose-dependent upregulation of antioxidant enzymes and Hsp70.

Conclusions:

  • The proteasome inhibitors MG132, lactacystin, and celastrol exhibit antioxidant effects in human PBMC.
  • These inhibitors upregulate key antioxidant enzymes (MnSOD, catalase, GST-π) and the stress protein Hsp70.
  • The observed modulation of cellular response confers protection against the detrimental effects of ionizing radiation.

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