alexa Paracrine and autocrine signals induce and maintain mesenchymal and stem cell states in the breast.
Oncology

Oncology

Journal of Cancer Science & Therapy

Author(s): Scheel C, Eaton EN, Li SH, Chaffer CL, Reinhardt F,

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Abstract The epithelial-mesenchymal transition (EMT) has been associated with the acquisition of motility, invasiveness, and self-renewal traits. During both normal development and tumor pathogenesis, this change in cell phenotype is induced by contextual signals that epithelial cells receive from their microenvironment. The signals that are responsible for inducing an EMT and maintaining the resulting cellular state have been unclear. We describe three signaling pathways, involving transforming growth factor (TGF)-β and canonical and noncanonical Wnt signaling, that collaborate to induce activation of the EMT program and thereafter function in an autocrine fashion to maintain the resulting mesenchymal state. Downregulation of endogenously synthesized inhibitors of autocrine signals in epithelial cells enables the induction of the EMT program. Conversely, disruption of autocrine signaling by added inhibitors of these pathways inhibits migration and self-renewal in primary mammary epithelial cells and reduces tumorigenicity and metastasis by their transformed derivatives. Copyright © 2011 Elsevier Inc. All rights reserved.
This article was published in Cell and referenced in Journal of Cancer Science & Therapy

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