Cell-state-specific metabolic networks govern ferroptosis versus apoptosis in small cell lung cancer.

In small cell lung cancer, low ASCL1 cells undergo ferroptosis after cysteine/cystine depletion, while ASCL1 high cells undergo apoptosis and resist ferroptosis.

• Why it matters: Metabolic heterogeneity and state switching in SCLC are linked to therapy resistance, but how metabolic programs shape ferroptosis versus apoptosis across neuroendocrine and non-neuroendocrine states is unclear.
• What they did: Using integrated transcriptomic and metabolomic analyses, the study found a universal exogenous cysteine/cystine dependency and tested cysteine depletion plus BH4/BH2 synthesis inhibition in patient-derived xenografts.
• The result: ASCL1 directly activates GCH1 to increase BH4/BH2 antioxidants, and combined cysteine depletion with BH4/BH2 synthesis inhibition reduced tumor growth in patient-derived xenografts.