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Eukaryotic cells can degrade proteins through several pathways. One of the most important among these is the ubiquitin-proteasome pathway. It helps the cell eliminate the misfolded, damaged, or unwarranted cytoplasmic proteins in a highly specific manner.
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Related Experiment Video

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Proteasome dysfunction activates autophagy and the Keap1-Nrf2 pathway.

Shun Kageyama1, Yu-shin Sou2, Takefumi Uemura3

  • 1From the Department of Biochemistry, School of Medicine, Niigata University, Chuo-ku, Niigata 951-8510, Japan, the Protein Metabolism Project and.

The Journal of Biological Chemistry
|July 23, 2014
PubMed
Summary

Cellular defense networks protect against proteostasis loss. Impaired proteasome function triggers autophagy and Nrf2 activation to clear toxic protein aggregates.

Keywords:
AutophagyAutophagy-related Protein 7 (ATG7)Nuclear Factor 2 (Erythroid-derived 2-Like Factor) (NFE2L2) (Nrf2)ProteasomeProtein Aggregation

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Area of Science:

  • Cellular Biology
  • Molecular Biology
  • Proteostasis Mechanisms

Background:

  • The ubiquitin-proteasome system (UPS) and autophagy are critical for maintaining cellular protein homeostasis (proteostasis).
  • Dysfunction in these pathways leads to the accumulation of ubiquitin-positive protein aggregates, a characteristic of various human diseases.
  • Understanding compensatory mechanisms against proteasomal dysfunction is vital for disease intervention.

Purpose of the Study:

  • To investigate in vivo compensatory cellular responses to impaired proteasome activity.
  • To elucidate the roles of autophagy and p62/Sqstm1 in response to proteasomal dysfunction in the liver.
  • To examine the activation of the Keap1-Nrf2 pathway as an adaptive response.

Main Methods:

  • Development of genetically modified mice with reduced liver proteasome activity.
  • Histopathological analysis of liver tissues to assess damage and aggregate formation.
  • Immunohistochemical staining for ubiquitin, p62/Sqstm1, and autophagosomes.
  • Genetic manipulation to suppress autophagy or delete p62/Sqstm1 in mutant mice.
  • Assessment of Nrf2 pathway activation via transcriptional analysis.

Main Results:

  • Mice with reduced proteasome activity developed severe liver damage and formed ubiquitin- and p62/Sqstm1-positive aggregates.
  • These aggregates were sequestered by autophagosomes, indicating selective autophagy involvement.
  • Simultaneous suppression of autophagy worsened liver pathology, while p62/Sqstm1 deficiency did not affect pathology despite its role in aggregate formation.
  • Proteasome dysfunction induced transcriptional activation of Nrf2, suggesting a protective adaptive response.

Conclusions:

  • Cells possess interconnected defense networks to counteract proteostasis failure.
  • Autophagy and the Nrf2 pathway are key players in the cellular response to proteasome impairment.
  • Targeting these compensatory mechanisms may offer therapeutic strategies for proteostasis-related diseases.