Abstract
Homeostatic programs balance immune protection and self-tolerance. Such mechanisms likely impact autoimmunity and tumor formation, respectively. How homeostasis is maintained and impacts tumor surveillance is unknown. Here, we find that different immune mononuclear phagocytes share a conserved steady-state program during differentiation and entry into healthy tissue. IFNγ is necessary and sufficient to induce this program, revealing a key instructive role. Remarkably, homeostatic and IFNγ-dependent programs enrich across primary human tumors, including melanoma, and stratify survival. Single-cell RNA sequencing (RNA-seq) reveals enrichment of homeostatic modules in monocytes and DCs from human metastatic melanoma. Suppressor-of-cytokine-2 (SOCS2) protein, a conserved program transcript, is expressed by mononuclear phagocytes infiltrating primary melanoma and is induced by IFNγ. SOCS2 limits adaptive anti-tumoral immunity and DC-based priming of T cells in vivo, indicating a critical regulatory role. These findings link immune homeostasis to key determinants of anti-tumoral immunity and escape, revealing co-opting of tissue-specific immune development in the tumor microenvironment.
Original language | English |
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Pages (from-to) | 127-141.e15 |
Journal | Cell |
Volume | 170 |
Issue number | 1 |
DOIs | |
State | Published - 29 Jun 2017 |
Externally published | Yes |
Keywords
- IFNγ
- dendritic cells
- differentiation
- homeostasis
- immunotherapy
- melanoma
- suppressor-of-cytokine-signaling 2 (SOCS2)
- tissue mononuclear phagocytes
- tolerance
- tumor microenvironment
All Science Journal Classification (ASJC) codes
- General Biochemistry,Genetics and Molecular Biology