Related Experiment Video

Updated: May 29, 2025

Author Spotlight: Tracing the Ferroptotic Signatures and Cell Death Dynamics in Medulloblastoma for Advanced Therapeutics
04:01

Author Spotlight: Tracing the Ferroptotic Signatures and Cell Death Dynamics in Medulloblastoma for Advanced Therapeutics

Published on: March 15, 2024

847

ADAR1 Regulates Lipid Remodeling to Dictate Ferroptosis Sensitivity

Che-Pei Kung, Nick D Terzich, Ma Xenia G Ilagen

    Biorxiv : the Preprint Server for Biology
    |February 3, 2025
    PubMed

    Insights

    Adenosine deaminase acting on RNA 1 (ADAR1) protects aggressive triple-negative breast cancer (TNBC) from cell death. Inhibiting ADAR1 sensitizes TNBC to ferroptosis, offering a new therapeutic vulnerability for this challenging cancer.

    Area of Science:

    • Oncology
    • Molecular Biology
    • Biochemistry

    Background:

    • Triple-negative breast cancer (TNBC) is aggressive and lacks targeted therapies.
    • Adenosine deaminase acting on RNA 1 (ADAR1) is implicated in TNBC development.
    • ADAR1 may protect TNBC from metabolic stress.

    Purpose of the Study:

    • To investigate the role of ADAR1 in ferroptosis, an iron-dependent cell death pathway, in TNBC.
    • To identify therapeutic strategies targeting ADAR1-mediated metabolic vulnerabilities in TNBC.

    Main Methods:

    • ADAR1 knockdown in TNBC cells.
    • Sensitivity assays with GPX4 inhibitors.
    • Liquid chromatography-mass spectrometry (LC-MS) for lipid profiling.
    • Transcriptomic analysis.
    • Phenotypic drug screening with a ferroptosis-focused library.

    Main Results:

    • ADAR1 knockdown sensitized TNBC cells to GPX4 inhibitors, indicating a role in ferroptosis regulation.
    • Loss of ADAR1 increased polyunsaturated fatty acid phospholipids (PUFA-PL), key drivers of ferroptosis.
    • Transcriptomic analysis identified the proto-oncogene MDM2 as involved in lipid remodeling upon ADAR1 loss.
    • Cobimetinib was identified as a potential drug-repurposing candidate to synergize with ADAR1 loss.

    Conclusions:

    • ADAR1 acts as a homeostatic factor protecting TNBC from ferroptosis.
    • Targeting ADAR1 could exploit a metabolic vulnerability in TNBC.
    • Findings support further investigation for novel TNBC therapeutic strategies.

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