Abstract
Elastin-rich lung extracellular matrix is largely remodeled during tumor invasion. Elastin degradation produces peptides displaying a wide range of biological activities. These elastin derived peptides (EP) interact with the elastin receptor complex (ERC) but also bind to αVβ3 integrin and galectin-3. In this study, we explored the role of EP and their receptors in tumor progression of lung carcinomas. Non-invasive and invasive lung tumor cell lines were incubated in presence of kappa-elastin (κE) or with synthetic peptides displaying receptor-specific sequences (VGVAPG, GRKRK, AGVPGLGVG and AGVPGFGAG). Modified Boyden chamber assays revealed an increased invasive capacity of invasive cells induced by κE. EP treatment had no effect on cell proliferation but zymography analysis revealed an increase of pro-MMP-2 and uPA levels in the conditioned media of treated cells. Moreover, the active form of MMP-2 was increased in invasive cells. Interestingly, this regulation was not observed at the mRNA level and actinomycin D was unable to inhibit κE effects. We also observed that the regulation of proteases protein level following κE treatment was an early process detectable after 1 h. All these effects could not be inhibited by lactose and V14, two ERC antagonists, or by blocking antibodies against αVβ3 integrin and galectin-3. Finally, VGVAPG and GRKRK failed to reproduce κE effects whereas nonapeptides partially mimicked them. These results demonstrate that treatment with EP up-regulates invasiveness of lung tumor cells via the release of proteolytic enzymes. This modulation involves post-transcriptional mechanisms and a nonapeptide-receptor different from the ERC, αVβ3 integrin and galectin-3.
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Abbreviations
- ACTD:
-
Actinomycin D
- AGVPGFGAG:
-
Ala-Gly-Val-Pro-Gly-Phe-Gly-Ala-Gly
- AGVPGLGVG:
-
Ala-Gly-Val-Pro-Gly-Leu-Gly-Val-Gly
- CD:
-
Circular dichroism
- EBP:
-
Elastin binding protein
- ECM:
-
Extracellular matrix
- EDTA:
-
Ethylenediaminetetraacetic acid
- EP:
-
Elastin derived peptides
- ERC:
-
Elastin receptor complex
- GRKRK:
-
Gly-Arg-Lys-Arg-Lys
- κE:
-
Kappa-elastin
- MMP:
-
Matrix metalloproteinase
- Neu-1:
-
Neuraminidase-1
- NMR:
-
Nuclear magnetic resonance
- PMSF:
-
Phenylmethylsulfonyl fluoride
- PPCA:
-
Protective protein/cathepsin A
- S-Gal:
-
Spliced galactosidase
- uPA:
-
Urokinase plasminogen activator
- VGVAPG:
-
Val-Gly-Val-Ala-Pro-Gly
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Acknowledgments
Simon Toupance is supported by a grant from the Ministry of Research. This work is supported by the Lions’s Clubs of Soissons, Villers-Cotterets and Crépy en Valois, by ACI Cancéropôle Grand Est 2007-2009 and by a grant from the CRP Santé of Luxembourg.
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The authors declare no conflict of interest.
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Philippe Birembaut and Laurent Debelle have contributed equally to this study.
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Toupance, S., Brassart, B., Rabenoelina, F. et al. Elastin-derived peptides increase invasive capacities of lung cancer cells by post-transcriptional regulation of MMP-2 and uPA. Clin Exp Metastasis 29, 511–522 (2012). https://doi.org/10.1007/s10585-012-9467-3
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DOI: https://doi.org/10.1007/s10585-012-9467-3