Enhanced Expression of Integrin [alpha]v[beta]3 Induced by TGF-[beta] Is Required for the Enhancing Effect of Fibroblast Growth Factor 1 in Mammary Epithelial Cells

Epithelial-to-mesenchymal transition (EMT) plays a critical role in cancer metastasis, and is regulated by growth factors such as transforming growth factor [beta] (TGF-[beta]) and fibroblast growth factors (FGF) secreted from the stromal and tumor cells. However, the role of growth factors in EMT h...

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Bibliographic Details
Published in:PloS one 2015-09, Vol.10 (9)
Main Authors: Mori, Seiji, Kodaira, Moe, Ito, Ayano, Okazaki, Mika, Kawaguchi, Naomasa, Hamada, Yoshinosuke, Takada, Yoshikazu, Matsuura, Nariaki
Format: Article
Language:English
Subjects:
Fibroblast growth factors
Gene expression
Integrins
Online Access:Get full text
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Summary:Epithelial-to-mesenchymal transition (EMT) plays a critical role in cancer metastasis, and is regulated by growth factors such as transforming growth factor [beta] (TGF-[beta]) and fibroblast growth factors (FGF) secreted from the stromal and tumor cells. However, the role of growth factors in EMT has not been fully established. Several integrins are upregulated by TGF-[beta]1 during EMT. Integrins are involved in growth factor signaling through integrin-growth factor receptor crosstalk. We previously reported that FGF1 directly binds to integrin [alpha]v[beta]3 and the interaction was required for FGF1 functions such as cell proliferation and migration. We studied the role of [alpha]v[beta]3 induced by TGF-[beta] on TGF-[beta]-induced EMT. Here, we describe that FGF1 augmented EMT induced by TGF-[beta]1 in MCF10A and MCF12A mammary epithelial cells. TGF-[beta]1 markedly amplified integrin [alpha]v[beta]3 and FGFR1 (but not FGFR2). We studied if the enhancing effect of FGF1 on TGF-[beta]1-induced EMT requires enhanced levels of both integrin [alpha]v[beta]3 expression and FGFR1. Knockdown of [beta]3 suppressed the enhancement by FGF1 of TGF-[beta]1-induced EMT in MCF10A cells. Antagonists to FGFR suppressed the enhancing effect of FGF1 on EMT. Integrin-binding defective FGF1 mutant did not augment TGF-[beta]1-induced EMT in MCF10A cells. These findings suggest that enhanced integrin [alpha]v[beta]3 expression in addition to enhanced FGFR1 expression is critical for FGF1 to augment TGF-[beta]1-induced EMT in mammary epithelial cells.
ISSN:1932-6203
1932-6203
DOI:10.1371/journal.pone.0137486