Abstract
TGF-β blockade significantly slows tumor growth through many mechanisms, including activation of CD8+ T cells and macrophages. Here, we show that TGF-β blockade also increases neutrophil-attracting chemokines, resulting in an influx of CD11b+/Ly6G+ tumor-associated neutrophils (TANs) that are hypersegmented, more cytotoxic to tumor cells, and express higher levels of proinflammatory cytokines. Accordingly, following TGF-β blockade, depletion of these neutrophils significantly blunts antitumor effects of treatment and reduces CD8+ T cell activation. In contrast, in control tumors, neutrophil depletion decreases tumor growth and results in more activated CD8+ T cells intratumorally. Together, these data suggest that TGF-β within the tumor microenvironment induces a population of TAN with a protumor phenotype. TGF-β blockade results in the recruitment and activation of TANs with an antitumor phenotype.
Original language | English |
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Pages (from-to) | 183-194 |
Number of pages | 12 |
Journal | Cancer Cell |
Volume | 16 |
Issue number | 3 |
DOIs | |
State | Published - 8 Sep 2009 |
Externally published | Yes |
Bibliographical note
Funding Information:This work was funded by NCI PO1 CA 66726, NHLBI T32 HL07586, NHLBI RO1 HL068876, and NIEHS P30 ES013508-02. Its contents are solely the responsibility of the authors and do not necessarily represent the official views of the NIEHS or NIH.
Keywords
- CELLCYCLE
- MOLIMMUNO