Selective inhibition of unfolded protein response induces apoptosis in pancreatic cancer cells

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Updated: Apr 27, 2026

Isolated Pancreatic Islet Treatment and Apoptosis Measurement
09:36

Isolated Pancreatic Islet Treatment and Apoptosis Measurement

Published on: May 2, 2025

959

Wenwen Chien1, Ling-Wen Ding, Qiao-Yang Sun

  • 1Cancer Science Institute of Singapore, National University of Singapore, Singapore.

Oncotarget
|June 23, 2014
PubMed

Insights

IRE1α inhibitors show promise in treating pancreatic cancer by halting tumor cell growth and inducing apoptosis. These compounds also exhibit synergistic effects with existing chemotherapy drugs, offering a novel therapeutic strategy.

Area of Science:

  • Oncology
  • Molecular Biology
  • Drug Discovery

Background:

  • Endoplasmic reticulum stress and unfolded protein response (UPR) are linked to pancreatic tumor cell proliferation.
  • IRE1α is a key regulator of the UPR pathway, making it a potential therapeutic target.

Purpose of the Study:

  • To evaluate the therapeutic potential of IRE1α inhibitors in pancreatic cancer.
  • To investigate the mechanisms of IRE1α inhibition on pancreatic cancer cell growth and survival.

Main Methods:

  • Utilized proliferation assays across 14 pancreatic cancer cell lines with specific IRE1α inhibitors.
  • Conducted clonogenic growth assays in soft agar and in vivo xenograft models.
  • Performed cell cycle analysis and Western blot to assess apoptosis and molecular markers.

Main Results:

  • IRE1α inhibitors demonstrated dose- and time-dependent growth inhibition in pancreatic cancer cells.
  • Inhibitors induced cell cycle arrest (G1 or G2/M phases) and apoptosis, confirmed by caspase cleavage and BIM induction.
  • Synergistic anti-cancer effects were observed when IRE1α inhibitors were combined with gemcitabine or bortezomib.

Conclusions:

  • IRE1α inhibitors represent a novel and effective therapeutic approach for pancreatic cancer.
  • Targeting the IRE1α pathway offers a promising strategy to overcome treatment resistance and improve patient outcomes.

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