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NF-κB/RelA controlled A20 limits TRAIL-induced apoptosis in pancreatic cancer

Claudia Geismann1, Charlotte Hauser2, Frauke Grohmann1

  • 1Department of Internal Medicine I, Laboratory of Molecular Gastroenterology & Hepatology, UKSH-Campus Kiel, Kiel, Germany.

Cell Death & Disease
|January 3, 2023
PubMed

Insights

Pancreatic cancer resistance to therapies is a challenge. This study identifies A20 as a key factor in TRAIL resistance, suggesting it as a potential therapeutic target for pancreatic ductal adenocarcinoma (PDAC).

Area of Science:

  • Oncology
  • Molecular Biology
  • Cancer Research

Background:

  • Pancreatic ductal adenocarcinoma (PDAC) exhibits resistance to systemic therapies, a significant clinical challenge.
  • Nuclear factor-kappa B (NF-κB) activity, both constitutive and inducible, plays a crucial role in this resistance.
  • Identifying specific NF-κB target genes involved in TRAIL resistance is essential for developing new therapeutic strategies.

Purpose of the Study:

  • To identify NF-κB target genes that mediate resistance to TRAIL (TNF-related apoptosis-inducing ligand) in pancreatic ductal adenocarcinoma (PDAC).
  • To investigate the role of A20, an NF-κB/RelA inducible target gene, in TRAIL resistance in PDAC.
  • To explore A20's mechanism of action and its interaction with other proteins in the context of TRAIL-induced apoptosis.

Main Methods:

  • Transcriptome assays were performed on TRAIL-sensitive and TRAIL-resistant PDAC cell lines.
  • NF-κB/RelA activity and A20 expression were analyzed in cell lines and patient tissues.
  • In vitro experiments assessed the impact of A20 expression on apoptosis induction by TRAIL and chemotherapeutics.
  • The role of A20's E3-ligase activity and the ubiquitin-binding protein p62 in TRAIL resistance was investigated.

Main Results:

  • A20 was identified as an NF-κB/RelA inducible target gene mediating TRAIL resistance in PDAC.
  • Elevated A20 protein expression correlated with activated RelA in PDAC patient tissues.
  • Increased A20 expression conferred resistance to TRAIL-mediated apoptosis but not to chemotherapy.
  • A20's E3-ligase activity and its interaction with p62 were found to be critical for TRAIL resistance.

Conclusions:

  • A20 is a key mediator of TRAIL resistance in pancreatic ductal adenocarcinoma.
  • Targeting A20 may represent a novel therapeutic strategy to overcome TRAIL resistance in PDAC.
  • Understanding the A20-p62 interaction provides insights into apoptosis regulation in cancer therapy.

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