Poly-GR promotes ferroptosis-associated vulnerability in C9orf72-ALS

accumulation and ferroptosis-associated injury. Functionally, poly-GR sensitized neuronal cells to erastin-induced ferroptotic stress-associated cell death, an effect reversed by Nrf2 or Slc7a11 overexpression and iron chelation. Together, these findings indicate that poly-GR disrupts redox homeostasis and iron metabolism to increase susceptibility to ferroptosis, highlighting the Nrf2/Slc7a11 pathway and labile iron regulation as potential therapeutic targets in C9orf72-associated ALS.