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24(S)-Hydroxycholesterol induces ER dysfunction-mediated unconventional cell death.

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Area of Science:

  • Neurobiology
  • Cell Biology
  • Biochemistry

Background:

  • Endoplasmic reticulum (ER) stress activates the unfolded protein response (UPR), which can promote cell survival or death.
  • 24(S)-hydroxycholesterol (24S-OHC) is crucial for brain cholesterol homeostasis but can be neurotoxic when esterified by ACAT1 in the ER.

Purpose of the Study:

  • To investigate the role of 24S-OHC ester accumulation in ER stress and cell death pathways.
  • To elucidate the specific UPR signaling mechanisms involved in 24S-OHC ester-induced neurotoxicity.

Main Methods:

  • Utilized human neuroblastoma SH-SY5Y cells.
  • Induced accumulation of 24S-OHC esters.
  • Analyzed UPR activation, ER membrane integrity, protein release, and global protein synthesis.

Main Results:

  • 24S-OHC esters activated pro-death UPR signaling, specifically regulated IRE1-dependent decay (RIDD), without activating pro-survival responses.
  • ER membrane integrity was disrupted, leading to the release of ER luminal proteins.
  • Global protein synthesis was significantly suppressed in cells treated with 24S-OHC.

Conclusions:

  • ER dysfunction, RIDD-mediated pro-death UPR signaling, and global protein synthesis inhibition contribute to 24S-OHC ester-induced cell death.
  • These findings reveal an unconventional cell death mechanism driven by ER stress and specific UPR pathways.