Abstract
Chronic activation of inflammatory pathways and suppressed interferon are hallmarks of immunosuppressive tumors. Previous studies have shown that CD11b integrin agonists could enhance anti-tumor immunity through myeloid reprograming, but the underlying mechanisms remain unclear. Herein we find that CD11b agonists alter tumor-associated macrophage (TAM) phenotypes by repressing NF-κB signaling and activating interferon gene expression simultaneously. Repression of NF-κB signaling involves degradation of p65 protein and is context independent. In contrast, CD11b agonism induces STING/STAT1 pathway-mediated interferon gene expression through FAK-mediated mitochondrial dysfunction, with the magnitude of induction dependent on the tumor microenvironment and amplified by cytotoxic therapies. Using tissues from phase I clinical studies, we demonstrate that GB1275 treatment activates STING and STAT1 signaling in TAMs in human tumors. These findings suggest potential mechanism-based therapeutic strategies for CD11b agonists and identify patient populations more likely to benefit.
Original language | English (US) |
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Pages (from-to) | 1073-1090.e12 |
Journal | Cancer Cell |
Volume | 41 |
Issue number | 6 |
DOIs | |
State | Published - Jun 12 2023 |
Externally published | Yes |
Keywords
- CD11b
- NF-κB
- STING
- immunotherapy
- pancreatic cancer
- tumor-associated macrophages
ASJC Scopus subject areas
- Oncology
- Cancer Research