Abstract
The metabolic tumor microenvironment (TME) is characterized inter alia by critical oxygen depletion (hypoxia/anoxia), extracellular acidosis (pH ≤ 6.8), high lactate levels (up to 40 mM in heterogeneously distributed areas), strongly elevated adenosine concentrations (10–100 μM) and declining nutrient resources. These TME features are major drivers, e.g., for genetic instability, intratumor heterogeneity, malignant progression and development of resistance to conventional anticancer therapies. In this context, hypoxia-dependent (and non-hypoxic) HIF-1α activation plays a key role in orchestrating a multifaceted (local) suppression of innate and adaptive antitumor immune responses (and of immune-based tumor treatment). Besides the characteristic traits mentioned, the immune-suppressive actions can additionally be triggered by an (over-)expression of VEGF and activation of VEGFR, and externalisation of phosphatidylserine from the inner to the outer membrane leaflet of cells and exosomes. Altogether, and even individually, these features provide strong immune-suppressive signals. The downstream effects of an enhanced HIF-1α expression include (a) an activation of immune-suppressive effects (recruitment and stimulation of immune-suppressor cells [e.g., Treg, MDSC], secretion of immune-suppressive TH2-type cytokines), and (b) inhibition of antitumor immune responses (inhibition of immune cell actions [e.g., NK, NKT, CD4+, CD8+], inhibition of antigen-presenting cells [e.g., DC], reduced production of immune-stimulatory TH1-type cytokines).
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Abbreviations
- A2AR, A2BR:
-
Adenosine receptors
- ADO:
-
Adenosine
- ATP:
-
Adenosine triphosphate
- cAMP:
-
Cyclic adenosine monophosphate
- CD39:
-
Ectonucleoside triphosphate diphosphohydrolase 1
- CD4+ :
-
Helper T cell
- CD73:
-
Ecto 5′-nucleotidase
- CD8+ :
-
Cytoxic T cell
- DC:
-
Dendritic cell
- ENT-1:
-
Equilibrative nucleoside transporter 1
- GPR81:
-
G-protein receptor 81 (= cell surface lactate receptor)
- Gs, Gi :
-
Stimulatory/inhibitory G-proteins
- HCA 1:
-
Hydroxycarboxylic acid receptor 1 (syn. GPR81)
- HIF:
-
Hypoxia-inducible (transcription) factor
- IFN-γ:
-
Interferon γ
- IL:
-
Interleukin
- LDH:
-
Lactate dehydrogenase A
- MDSC:
-
Myeloid-derived suppressor cell
- mTOR:
-
Mechanistic (“mammalian”) target of rapamycin
- MΦ:
-
Macrophage
- NK:
-
Natural killer cell
- NKT:
-
Natural killer like T cell
- PANX:
-
Pannexin (ATP channel)
- PDL1:
-
Programmed cell death 1 protein ligand
- pO2 :
-
Oxygen partial pressure
- PS:
-
Phosphatidylserine
- TGF-β:
-
Transforming growth factor β
- TH:
-
T helper cell
- TIM:
-
T cell immunoglobulin and mucin domain (PS surface receptor)
- TME :
-
Tumor microenvironment
- TNF-α:
-
Tumor necrosis factor α
- Treg:
-
Regulatory T cell
- VEGF:
-
Vascular endothelial growth factor
- VEGF-R:
-
VEGF receptor
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Vaupel, P., Multhoff, G. (2018). Hypoxia-/HIF-1α-Driven Factors of the Tumor Microenvironment Impeding Antitumor Immune Responses and Promoting Malignant Progression. In: Thews, O., LaManna, J., Harrison, D. (eds) Oxygen Transport to Tissue XL. Advances in Experimental Medicine and Biology, vol 1072. Springer, Cham. https://doi.org/10.1007/978-3-319-91287-5_27
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DOI: https://doi.org/10.1007/978-3-319-91287-5_27
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