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ABSTRACT: Background
The transforming growth factor (TGF)-β superfamily comprises cytokines such as TGF-β and Bone Morphogenetic Proteins (BMPs), which have a critical role in a multitude of biological processes. In breast cancer, high levels of TGF-β are associated with poor outcome, whereas inhibition of TGF-β-signaling reduces metastasis. In contrast, BMP-7 inhibits bone metastasis of breast cancer cells.Methods
In this study, we investigated the effect of BMP-7 on TGF-β-induced invasion in a 3 dimensional invasion assay.Results
BMP-7 inhibited TGF-β-induced invasion of the metastatic breast cancer cell line MCF10CA1a, but not of its premalignant precursor MCF10AT in a spheroid invasion model. The inhibitory effect appears to be specific for BMP-7, as its closest homolog, BMP-6, did not alter the invasion of MCF10CA1a spheroids. To elucidate the mechanism by which BMP-7 inhibits TGF-β-induced invasion, we analyzed invasion-related genes. BMP-7 inhibited TGF-β-induced expression of integrin α(v)β(3) in the spheroids. Moreover, targeting of integrins by a chemical inhibitor or knockdown of integrin β(3) negatively affected TGF-β-induced invasion. On the other hand, overexpression of integrin β(3) counteracted the inhibitory effect of BMP7 on TGF-β-induced invasion.Conclusion
Thus, BMP-7 may exert anti-invasive actions by inhibiting TGF-β-induced expression of integrin β(3).
SUBMITTER: Naber HP
PROVIDER: S-EPMC3268977 | biostudies-literature | 2012 Feb
REPOSITORIES: biostudies-literature
Naber Hildegonda P H HP Wiercinska Eliza E Pardali Evangelia E van Laar Theo T Nirmala Ella E Sundqvist Anders A van Dam Hans H van der Horst Geertje G van der Pluijm Gabri G Heckmann Bertrand B Danen Erik H J EH Ten Dijke Peter P
Cellular oncology (Dordrecht, Netherlands) 20110921 1
<h4>Background</h4>The transforming growth factor (TGF)-β superfamily comprises cytokines such as TGF-β and Bone Morphogenetic Proteins (BMPs), which have a critical role in a multitude of biological processes. In breast cancer, high levels of TGF-β are associated with poor outcome, whereas inhibition of TGF-β-signaling reduces metastasis. In contrast, BMP-7 inhibits bone metastasis of breast cancer cells.<h4>Methods</h4>In this study, we investigated the effect of BMP-7 on TGF-β-induced invasio ...[more]