Document Detail

Tissue inhibitor of metalloproteinases-1-induced scattered liver metastasis is mediated by hypoxia-inducible factor-1α.
MedLine Citation:
PMID:  21053058     Owner:  NLM     Status:  In-Data-Review    
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.
Florian Schelter; Birgit Halbgewachs; Petra Bäumler; Caroline Neu; Agnes Görlach; Florian Schrötzlmair; Achim Krüger
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Publication Detail:
Type:  Journal Article     Date:  2010-10-30
Journal Detail:
Title:  Clinical & experimental metastasis     Volume:  28     ISSN:  1573-7276     ISO Abbreviation:  Clin. Exp. Metastasis     Publication Date:  2011 Feb 
Date Detail:
Created Date:  2011-02-17     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8409970     Medline TA:  Clin Exp Metastasis     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  91-9     Citation Subset:  IM    
Institut für Experimentelle Onkologie und Therapieforschung des Klinikums rechts der Isar, Technische Universität München, Ismaninger Straße 22, 81675, München, Germany.
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