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Abstract
Targeting the dynamic tumor immune microenvironment (TIME) can provide effective therapeutic strategies for cancer. Neutrophils are the predominant leukocyte population in mice and humans, and mounting evidence implicates these cells during tumor growth and metastasis. Neutrophil extracellular traps (NETs) are networks of extracellular neutrophil DNA fibers that are capable of binding tumor cells to support metastatic progression. Here, we demonstrate that circulating NET levels are elevated in advanced esophageal, gastric, and lung cancer patients compared with local cancers and healthy controls. Using preclinical murine models of lung and colon cancer, in combination with intravital video microscopy, we show that NETs functionally regulate disease progression and that blocking NETosis through multiple strategies significantly inhibits spontaneous metastasis to the lung and liver. Furthermore, we show how inhibiting tumor-induced NETs decreases cancer cell adhesion to liver sinusoids following intrasplenic injection — a mechanism previously thought to be driven primarily by exogenous stimuli. Thus, in addition to neutrophil abundance, the functional contribution of NETosis within the TIME has critical translational relevance and represents a promising target to impede metastatic dissemination.
Authors
Roni F. Rayes, Jack G. Mouhanna, Ioana Nicolau, France Bourdeau, Betty Giannias, Simon Rousseau, Daniela Quail, Logan Walsh, Veena Sangwan, Nicholas Bertos, Jonathan Cools-Lartigue, Lorenzo E. Ferri, Jonathan D. Spicer
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