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Related Experiment Videos

Proteasome structures affected by ionizing radiation.

Milena Pervan1, Keisuke S Iwamoto, William H McBride

  • 1Department of Radiation Oncology, Roy E. Coats Research Laboratories, David Geffen School of Medicine at UCLA, 10833 Le Conte Avenue, Los Angeles, CA 90095-1714, USA.

Molecular Cancer Research : MCR
|July 28, 2005
PubMed
Summary
This summary is machine-generated.

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Ionizing radiation damages the 26S proteasome, impairing protein degradation. Free radicals mediate this damage, leading to the accumulation of cellular proteins and impacting cell functions after radiation exposure.

Area of Science:

  • Cellular Biology
  • Radiation Biology
  • Biochemistry

Background:

  • The proteasome is crucial for degrading short-lived proteins, influencing cellular processes like cell cycle arrest, DNA repair, and apoptosis.
  • Ionizing radiation exposure can alter proteasome activity, potentially contributing to radiation-induced biological effects.

Purpose of the Study:

  • To identify the specific target within the proteasome affected by ionizing radiation.
  • To investigate the mechanism underlying radiation-induced changes in proteasome function.

Main Methods:

  • Irradiation of purified 26S proteasomes from human prostate cancer PC3 cells.
  • Assay of proteasome enzymatic and ATPase activities.
  • Treatment with free radical scavenger tempol.

Related Experiment Videos

  • Analysis of proteasome substrates in irradiated cells.

    • Main Results:

    • 26S proteasomes exhibited a dose-independent decrease in proteolytic activity and an increase in ATPase activity after irradiation.
    • 20S proteasomes remained unaffected, indicating the 19S cap is the radiation-sensitive component.
    • Free radicals were identified as mediators of these radiation-induced changes.
    • Irradiated cells showed accumulation of proteasome substrates, including polyubiquitinated proteins and ornithine decarboxylase.

    Conclusions:

    • The 19S cap of the 26S proteasome is a primary target for ionizing radiation.
    • Radiation-induced impairment of proteasome function is mediated by free radicals.
    • This functional impairment has physiological relevance, leading to the accumulation of key cellular proteins.