1461-Arginine Deprivation Enhances GB Radiosensitivity

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 explains their aggressive nature and typically poor clinical prognosis. By reprogramming one-carbon metabolism to increase SAM availability, this metabolic intervention creates a window of vulnerability that enhances the lethal effects of standard treatment. These findings suggest that combining metabolic depletion with radiation offers a promising, personalized strategy for treating the most resistant forms of brain cancer.References:Wu N, Xu Z, Perryman R, et al. Arginine deprivation enhances ASS1-negative glioblastoma radiosensitivity via epigenetic silencing of DNA repair genes[J]. Cell Death & Disease, 2026.前往小宇宙评论区与主播互动