Inhibitors of Aβ42-induced endoplasmic reticular unfolded protein response (UPRER), in yeast, also rescue yeast cells from Aβ42-mediated apoptosis

Asma Derf, Ramesh Mudududdla, Sandip B. Bharate, Bhabatosh Chaudhuri

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Aggregated Aβ peptides which cause amyloid deposits, a characteristic of Alzheimer's disease (AD), activate a stress response in the endoplasmic reticulum (ER), known as the unfolded protein response, UPRER. Nascent UPRER induction helps in reducing ER stress by eliminating accumulated misfolded/aggregated secretory proteins. However, prolonged UPRER induction may trigger apoptosis. Here we show that, when expressed in yeast with an NH2-terminal secretory signal sequence (ss), the 42-amino acid human Aβ42 (h_Aβ42), but not the mouse/ratAβ42 (m_Aβ42) which reportedly does not misfold/aggregate, induces UPRER as monitored via an eGFP reporter. We also show that expression of ss-h_Aβ42, not ss-m_Aβ42, blocks yeast cell growth, with cells expressing ss-h_Aβ42 manifesting distinctive features of apoptosis such as loss of mitochondrial membrane potential, increase in ROS levels and DNA fragmentation. Screening for suppressors of ss-h_Aβ42-activated UPRER-eGFP induction, in a computationally-designed 29-compound methoxy-stilbene library, revealed three compounds that reduce >95% of UPRER-eGFP induction at 5 μM concentration, with EC50 values of 40–50 nM. Surprisingly, the compounds also rescue yeast cells from ss-h_Aβ42-mediated apoptosis, with EC50-s of 50–60 nM. These results provide direct evidence, probably for the first time, that there is a direct correlation between deactivation of UPRER and attenuation of apoptosis.

Original languageEnglish
Pages (from-to)118-127
Number of pages10
JournalEuropean Journal of Pharmaceutical Sciences
Volume128
DOIs
Publication statusPublished - 1 Feb 2019
Externally publishedYes

Keywords

  • Abeta
  • Apoptosis
  • DNA-fragmentation
  • Mitochondrial-membrane-potential
  • ROS
  • Unfolded-protein-response (UPR)
  • UPR-eGFP

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