1461-Arginine Deprivation Enhances GB Radiosensitivity

Paper Talk · Aug 20, 2026 · 20m

This research examines how arginine deprivation can be used as a targeted therapy to improve radiotherapy outcomes for patients with ASS1-negative glioblastoma. Using the drug ADI-PEG20, researchers discovered that depleting extracellular arginine triggers epigenetic changes, specifically increasing the repressive H3K27me3 histone marker. This process effectively silences critical DNA repair genes like PARP1 and LIG1, leaving cancer cells unable to recover from radiation-induced damage. The study highlights that ASS1-negative tumors naturally possess hyperactivated repair pathways, which…