Macrophage-induced ferritin expression protects pancreatic cancer cells from ferroptosis.

Macrophage-induced ferritin expression in TIGAR-null pancreatic cancer cells protects against ferroptosis, promoting metastasis.

• Why it matters: Understanding how tumor cells survive high oxidative stress is crucial because ROS promote both tumor progression and cell death, yet the mechanisms enabling survival during metastasis remain unclear.
• What they did: Researchers co-cultured TIGAR-null pancreatic ductal adenocarcinoma cells with macrophages, observed IL-6 secretion leading to ferritin (FTH1) upregulation via STAT3 activation, and depleted FTH1 to assess ferroptosis sensitivity and metastasis.
• The result: FTH1 depletion restored ferroptosis sensitivity and reduced lung metastasis in TIGAR-null cells, indicating that ferritin expression enables tumor survival under oxidative stress and supports metastatic spread.