Abstract
The “protease web”, representing the network of proteases, their inhibitors, and effector molecules, arises as a pivotal determinant of tissue homeostasis. Imbalances of this network, for instance caused by elevated host levels of tissue inhibitor of metalloproteinases-1 (TIMP-1), have been shown to increase the susceptibility of target organs to scattered metastasis by inducing the hepatocyte growth factor (HGF) pathway. Increased expression of the hypoxia-inducible factor-1α-subunit (HIF-1α) is also associated with tumour progression and is also known to induce HGF-signaling via up-regulation of the HGF-receptor Met, namely under canonical stress conditions like lack of oxygen. Here, we aimed to identify a possible metastasis-promoting connection between TIMP-1, HIF-1α, and HGF-signaling. We found that HIF-1α and HIF-1-signaling were increased during liver metastasis of L-CI.5s T-lymphoma cells in TIMP-1 overexpressing syngeneic DBA/2 mice. In vitro, exposure of L-CI.5s cells to recombinant TIMP-1 revealed that TIMP-1 itself was able to induce HIF-1α and HIF-1-signaling. Knock-down of HIF-1α identified tumour cell-derived HIF-1α as mediator of this TIMP-1-induced invasiveness in vitro. In vivo, HIF-1α knock-down significantly impaired Met expression as well as Met phosphorylation and inhibited scattered liver metastasis. Furthermore, HGF-dependent TIMP-1-promoted Met phosphorylation and HGF-dependent TIMP-1-induced invasiveness in vitro was mediated by HIF-1α. We conclude that elevated levels of TIMP-1 in the microenvironment of tumour cells can promote metastasis by inducing HIF-1α-dependent HGF-signaling. This connection between a protease inhibitor (TIMP-1) and a classically stress-related factor (HIF-1α) is a so far undiscovered impact of the “protease web” on tissue homeostasis with important implications for metastasis.
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Abbreviations
- Ad:
-
Adenovirus
- BSA:
-
Bovine serum albumine
- CAIX:
-
Carboanhydrase IX
- DAB:
-
3,3′-Diaminobenzidine
- DAPI:
-
4′,6-Diamidine-2-phenylindole
- HEK:
-
Human embryonic kidney cell
- HGF:
-
Hepatocyte growth factor
- HIF:
-
Hypoxia-inducible factor
- HRE:
-
Hypoxia-responsive element
- HRP:
-
Horseradish peroxidase
- i.v.:
-
Intraveneous
- Met:
-
Hepatocyte growth factor receptor
- MMP:
-
Matrix metalloproteinase
- NT:
-
Non-template
- PBS:
-
Phosphate-buffered saline
- Pfu:
-
Plaque-forming unit
- qRT-PCR:
-
Quantitative real-time polymerase chain reaction
- rec:
-
Recombinant
- SDS-PAGE:
-
Sodiumdodecylsulfate polyacrylamide gel electrophoresis
- SEM:
-
Standard error mean
- sh:
-
Small hairpin
- TBS:
-
2-Amino-2-(hydroxymethyl)-propane-1,3-diole-buffered saline
- TIMP:
-
Tissue inhibitor of metalloproteinases
- X-Gal:
-
5-Bromo-4-chloro-3-indolyl-β-d-galactopyranoside
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Acknowledgments
The author thank Katja Honert, Mareike Lehnhoff, Tina Krause, and Dr Susanne Schaten (all from Institut für Experimentelle Onkologie und Therapieforschung des Klinikums rechts der Isar, Technische Universität München, Munich, Germany) for their expert technical assistance. For financial support, the authors thank the European Union Research Framework Programme 7, project HEALTH-2007-201279/Microenvimet (to Achim Krüger) and project HEALTH-F2-2009-222741/Metoxia (to Agnes Görlach), and the Deutsche Forschungsgemeinschaft, grant KR2047/1-1 (to Achim Krüger).
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Schelter, F., Halbgewachs, B., Bäumler, P. et al. Tissue inhibitor of metalloproteinases-1-induced scattered liver metastasis is mediated by hypoxia-inducible factor-1α. Clin Exp Metastasis 28, 91–99 (2011). https://doi.org/10.1007/s10585-010-9360-x
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DOI: https://doi.org/10.1007/s10585-010-9360-x