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Study of Protein-protein Interactions in Autophagy Research
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Study of Protein-protein Interactions in Autophagy Research

Published on: September 9, 2017

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Che-1-induced inhibition of mTOR pathway enables stress-induced autophagy

Agata Desantis1, Tiziana Bruno1, Valeria Catena2

  • 1Epigenetics Laboratory, Molecular Medicine Area Regina Elena National Cancer Institute, Rome, Italy.

The EMBO Journal
|March 16, 2015
PubMed

Insights

Che-1 protein, activated by DNA damage, inhibits mTOR signaling during stress. This regulation is crucial for cell survival and autophagy, particularly in multiple myeloma.

Area of Science:

  • Cellular Biology
  • Molecular Biology
  • Cancer Research

Background:

  • Mammalian target of rapamycin (mTOR) is a central regulator of cell growth, metabolism, and autophagy, maintaining cellular homeostasis.
  • mTOR activity is suppressed by cellular stress signals like nutrient deprivation, hypoxia, and DNA damage.

Purpose of the Study:

  • To investigate the role of Che-1, a DNA damage-responsive protein, in regulating mTOR activity under stress conditions.
  • To elucidate the mechanism by which Che-1 influences mTOR inhibitors and stress-induced autophagy.
  • To explore the significance of Che-1 in the context of multiple myeloma progression.

Main Methods:

  • Investigated Che-1's effect on mTOR activity in response to various stress stimuli.
  • Analyzed the expression of mTOR inhibitors Redd1 and Deptor following Che-1 activation.
  • Assessed the requirement of Che-1 for stress-induced autophagy.
  • Correlated Che-1 expression levels with multiple myeloma progression in patient samples.

Main Results:

  • Che-1 activation under stress conditions leads to the inhibition of mTOR kinase activity.
  • Che-1 upregulates the expression of Redd1 and Deptor, known inhibitors of mTOR.
  • Che-1-mediated inhibition of mTOR is essential for the induction of autophagy during cellular stress.
  • Elevated Che-1 expression is observed in multiple myeloma and is critical for cancer cell growth and survival.

Conclusions:

  • Che-1 acts as a novel inhibitor of mTOR signaling in response to cellular stress.
  • The Che-1/Redd1/Deptor axis plays a vital role in mediating stress-induced autophagy.
  • Che-1 represents a potential therapeutic target in multiple myeloma due to its role in cancer cell proliferation and survival.
Keywords:
Che‐1autophagymTORmultiple myeloma

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