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Document Type
- Article (21)
Language
- English (21)
Has Fulltext
- yes (21)
Is part of the Bibliography
- no (21)
Keywords
- hypoxia (5)
- Hypoxia (3)
- extracellular vesicles (3)
- HIF (2)
- Iron (2)
- Mitochondria (2)
- adipose-derived stromal/stem cells (2)
- macrophage (2)
- mesenchymal stromal/stem cells (2)
- monocytes (2)
Schwantes, Anna ; Wickert, Anja ; Becker, Sabrina ; Baer, Patrick C. ; Weigert, Andreas ; Brüne, Bernhard ; Fuhrmann, Dominik Christian
Highlights
• TAM polarization induces CP RNA.
• CP RNA expression is regulated by HIF-2 and STAT1.
• CP RNA is transferred from TAMs to HT1080 cells.
• CP RNA is translated by HT1080 cells and protects from ferroptosis.
• Co-cultured HT1080 cells decrease iron and lipid peroxidation.
Abstract
Solid tumors are characterized by hypoxic areas, which are prone for macrophage infiltration. Once infiltrated, macrophages polarize to tumor associated macrophages (TAM) to support tumor progression. Therefore, the crosstalk between TAMs and tumor cells is of current interest for the development of novel therapeutic strategies. These may comprise induction of an iron- and lipid peroxidation-dependent form of cell death, known as ferroptosis. To study the macrophage - tumor cell crosstalk we polarized primary human macrophages towards a TAM-like phenotype, co-cultured them with HT1080 fibrosarcoma cells, and analyzed the tumor cell response to ferroptosis induction. In TAMs the expression of ceruloplasmin mRNA increased, which was driven by hypoxia inducible factor 2 and signal transducer and activator of transcription 1. Subsequently, ceruloplasmin mRNA was transferred from TAMs to HT1080 cells via extracellular vesicles. In tumor cells, mRNA was translated into protein to protect HT1080 cells from RSL3-induced ferroptosis. Mechanistically this was based on reduced iron abundance and lipid peroxidation. Interestingly, in naïve macrophages also hypoxia induced ceruloplasmin under hypoxia and a co-culture of HT1080 cells with hypoxic macrophages recapitulated the protective effect observed in TAM co-cultures. In conclusion, TAMs provoke tumor cells to release iron and thereby protect them from lipid peroxidation/ferroptosis.