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Macrophages Under the Influence of Tumor Mesothelin Weaken Host Defenses against Pancreatic Cancer Metastasis.
Cancer Research 2024 Februrary 16
Although pancreatic cancer is a systemic disease that metastasizes early in its course, the signaling systems that promote this behavior remain incompletely understood. In this issue of Cancer Research, Luckett and colleagues identify a paracrine signaling pathway between cancer cells and macrophages that promotes pancreatic cancer metastasis. The authors used immunocompetent murine pancreatic cancer models with high versus low metastatic potential, genetic knockout and complementation strategies, and The Cancer Genome Atlas human data to demonstrate that tumor-secreted mesothelin repolarizes tumor and lung macrophages to a tumor-supportive phenotype. The repolarized macrophages increase secretion of VEGF and S100A9, raising local concentrations. In turn, VEGF enhances colony formation of cancer cells, while S100A9 promotes the recruitment of neutrophils to the lungs and the formation of neutrophil extracellular traps that support tumor metastasis. Together, these findings reveal a systemic signaling pathway that promotes pancreatic cancer metastasis by co-opting macrophages typically protective against cancer to instead promote its spread. See related article by Luckett et al., p. 527.
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