Macrophages foster anti-tumor immunity by ZEB1-dependent cytotoxic T cell chemoattraction.

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作者:Fuchs Kathrin, D'Avanzo Elisabetta, Armstark Isabell, van Roey Ruthger, Clavel Ezquerra Ana, Bindel Nino, Siebenkäs Katharina, Hajjaj Yussuf, Liguori Renato, Ferrazzi Fulvia, Amon Lukas, Bulang Johanna, Hübner Julian, Edler Marcel, Grace Ece, Schwab Annemarie, Alfredo Marwin, Faas Maria, Ackermann Jochen, Percivalle Elena, Günther Claudia, Hoffmann Markus H, Krönke Gerhard, Becker Christoph, Dudziak Diana, Arnold Philipp, Woehner Miriam, Nimmerjahn Falk, Brabletz Simone, Stemmler Marc P, Brabletz Thomas, Schuhwerk Harald
Tumor-associated macrophages (TAMs) dynamically influence anti-tumor immunity. Understanding TAM function is therefore critical to design immunotherapies. By combining syngeneic models of colorectal and pancreatic cancer with cell type-specific deletion of the epithelial-to-mesenchymal transition driver Zeb1, which is expressed in subsets of TAMs, we discovered that ZEB1 is an intrinsic regulator of TAM-controlled T cell trafficking and anti-tumor immune responses. ZEB1 supports secretion of a subset of chemokines via the constitutive pathway, including CXCL10, CCL2 and CCL22, by regulating their biosynthesis, vesicular transport and release. This elevates cytotoxic T cell (CTL) recruitment in vitro and fosters immunosurveillance by CTLs in tumors and metastases as well in an organotypic model for therapeutic CD8 + T cell addition. Our study identifies ZEB1 in TAMs as a facilitator of anti-tumor immunity, suggests a window of opportunity for cytokine-guided CTL tropism and reinforces the importance of onco-immunological context, particularly in the design of macrophage- and/or cytokine-depleting strategies.

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