Article ; Online: Phagocytosis increases an oxidative metabolic and immune suppressive signature in tumor macrophages.
The Journal of experimental medicine
2023 Volume 220, Issue 6
Abstract: Phagocytosis is a key macrophage function, but how phagocytosis shapes tumor-associated macrophage (TAM) phenotypes and heterogeneity in solid tumors remains unclear. Here, we utilized both syngeneic and novel autochthonous lung tumor models in which ... ...
Abstract | Phagocytosis is a key macrophage function, but how phagocytosis shapes tumor-associated macrophage (TAM) phenotypes and heterogeneity in solid tumors remains unclear. Here, we utilized both syngeneic and novel autochthonous lung tumor models in which neoplastic cells express the fluorophore tdTomato (tdTom) to identify TAMs that have phagocytosed neoplastic cells in vivo. Phagocytic tdTompos TAMs upregulated antigen presentation and anti-inflammatory proteins, but downregulated classic proinflammatory effectors compared to tdTomneg TAMs. Single-cell transcriptomic profiling identified TAM subset-specific and common gene expression changes associated with phagocytosis. We uncover a phagocytic signature that is predominated by oxidative phosphorylation (OXPHOS), ribosomal, and metabolic genes, and this signature correlates with worse clinical outcome in human lung cancer. Expression of OXPHOS proteins, mitochondrial content, and functional utilization of OXPHOS were increased in tdTompos TAMs. tdTompos tumor dendritic cells also display similar metabolic changes. Our identification of phagocytic TAMs as a distinct myeloid cell state links phagocytosis of neoplastic cells in vivo with OXPHOS and tumor-promoting phenotypes. |
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MeSH term(s) | Humans ; Macrophages/metabolism ; Phagocytosis/genetics ; Lung Neoplasms/pathology ; Myeloid Cells/metabolism ; Oxidative Stress ; Tumor Microenvironment |
Language | English |
Publishing date | 2023-03-30 |
Publishing country | United States |
Document type | Journal Article ; Research Support, N.I.H., Extramural ; Research Support, U.S. Gov't, Non-P.H.S. ; Research Support, Non-U.S. Gov't |
ZDB-ID | 218343-2 |
ISSN | 1540-9538 ; 0022-1007 |
ISSN (online) | 1540-9538 |
ISSN | 0022-1007 |
DOI | 10.1084/jem.20221472 |
Database | MEDical Literature Analysis and Retrieval System OnLINE |
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