Longevity & AgingCancer Cells Hijack a Protein Switch to Survive Oxidative Death
Researchers discovered that the glutathione-synthesizing enzyme GCLC is regulated by succinylation, a chemical tag that suppresses its activity. Under oxidative stress, the enzyme SIRT2 removes this tag, boosting glutathione (GSH) production and shielding cancer cells from ferroptosis—an iron-dependent form of cell death. The acetyltransferase P300 adds the succinyl tag, while ROS weakens P300's grip on GCLC and strengthens SIRT2's, creating a finely tuned redox sensor. Blocking this axis, either by depleting SIRT2 or introducing a permanently succinylated GCLC mutant, sensitizes cancer cells to ferroptosis inducers, pointing to a promising therapeutic vulnerability in tumors.
