Fibulin-5 initiates epithelial-mesenchymal transition (EMT) and enhances EMT induced by TGF-beta in mammary epithelial cells via a MMP-dependent mechanism.

Carcinogenesis
Yong-Hun LeeWilliam P Schiemann

Abstract

Epithelial-mesenchymal transition (EMT) is a normal physiological process that regulates tissue development, remodeling and repair; however, aberrant EMT also elicits disease development in humans, including lung fibrosis, rheumatoid arthritis and cancer cell metastasis. Transforming growth factor-beta (TGF-beta) is a master regulator of EMT in normal mammary epithelial cells (MECs), wherein this pleiotropic cytokine also functions as a potent suppressor of mammary tumorigenesis. In contrast, malignant MECs typically evolve resistance to TGF-beta-mediated cytostasis and develop the ability to proliferate, invade and metastasize when stimulated by TGF-beta. It therefore stands to reason that establishing how TGF-beta promotes EMT may offer new insights into targeting the oncogenic activities of TGF-beta in human breast cancers. By monitoring alterations in the actin cytoskeleton and various markers of EMT, we show here that the TGF-beta gene target, fibulin-5 (FBLN5), initiates EMT and enhances that induced by TGF-beta. Whereas normal MECs contain few FBLN5 transcripts, those induced to undergo EMT by TGF-beta show significant upregulation of FBLN5 messenger RNA, suggesting that EMT and the dedifferentiation of MECs override the...Continue Reading

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