Abstract
The interrelating dynamics of the primary tumor cells and their surrounding microenvironment might determine phenotypic characteristics of disseminated tumor cells and contribute to cancer metastasis. Cytoprotective mechanisms (e.g., energy metabolism control, DNA damage response, global translation control and unfolded protein response) exert selective pressure in the tumor microenvironment. In particular, adaptation to hypoxia is vital for survival of malignant cells in the tumor and at distant sites such as the bone marrow. In addition to the stress response, the ability of tumor cells to undergo certain cellular re-differentiation programmes like the epithelial-mesenchymal transition (EMT), which is linked to cancer stemness, appears to be important for successful cancer cell spread. Here we will discuss the selection pressures that eventually lead to the formation of overt metastases. We will focus the properties of the microenvironment including (i) metabolic and cytoprotective programs that ensure survival of disseminated tumor cells, (ii) blood vessel structure, and (iii) the hypoxia-normoxia switch as well as intrinsic factors affecting the evolvement of novel tumor cell populations.
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Abbreviations
- ATF6:
-
activating transcription factor 6
- CTC:
-
circulating tumor cells
- CXCR4:
-
C-X-C chemokine receptor 4
- DTC:
-
disseminated tumor cells
- EGFR:
-
epidermal growth factor receptor
- EIF2:
-
eukaryotic initiation factor 2
- EMT:
-
epithelial-mesenchymal transition
- ER:
-
endoplasmatic reticulum
- HIF-1:
-
hypoxia inducible factor 1
- HR:
-
homologous recombination
- IRE1:
-
inositol-requiring protein 1
- MET:
-
mesenchymal-epithelial transition
- NHEJ:
-
non-homologous end joining
- PDI:
-
protein disulfide isomerase
- PERK:
-
PKR-like ER kinase
- PTEN:
-
phosphatase and tensin homolog
- ROS:
-
reactive oxygen species
- RTK:
-
receptor tyrosine kinase
- SDF1:
-
stromal cell-derived factor 1
- UPR:
-
unfolded protein response
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Acknowledgements
This work was supported by the Stiftung für Pathobiochemie und Molekulare Diagnostik of the Deutsche Gesellschaft für Klinische Chemie und Laboratoriumsmedizin and by the European Community’s 7th Framework Programme (FP7/2007-2013) under grant agreement n° 202230, acronym GENINCA.
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Bartkowiak, K., Riethdorf, S. & Pantel, K. The Interrelating Dynamics of Hypoxic Tumor Microenvironments and Cancer Cell Phenotypes in Cancer Metastasis. Cancer Microenvironment 5, 59–72 (2012). https://doi.org/10.1007/s12307-011-0067-6
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DOI: https://doi.org/10.1007/s12307-011-0067-6