Neutrophil-Driven Trogocytosis in Pancreatic Ductal Adenocarcinoma Liver Metastases Restrains Immunosuppressive Macrophage Polarization and Limits Metastatic Progression.

Neutrophils limit immunosuppressive macrophage polarization in PDAC liver metastases through trogocytosis, reducing metastatic progression by 50%.

• Why it matters: Understanding immune interactions in PDAC metastasis is crucial because early liver spread leads to limited treatment options and poor survival, yet neutrophil roles remain unclear.
• What they did: The study used intravital calcium imaging and single-cell RNA sequencing to observe neutrophil behavior and their influence on macrophage subpopulations in a PDAC metastasis mouse model, focusing on their interactions and signaling pathways.
• The result: Findings show neutrophils uptake tumor fragments and prevent immunosuppressive macrophage development via C3-dependent signaling, suggesting that targeting neutrophil-macrophage crosstalk could improve therapeutic strategies.