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Published in: Molecular Cancer 1/2009

Open Access 01-12-2009 | Research

Cooperation of Notch and Ras/MAPK signaling pathways in human breast carcinogenesis

Authors: Suruchi Mittal, Deepa Subramanyam, Devaveena Dey, Rekha V Kumar, Annapoorni Rangarajan

Published in: Molecular Cancer | Issue 1/2009

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Abstract

Background

Recent studies have implicated aberrant Notch signaling in breast cancers. Yet, relatively little is known about the pattern of expression of various components of the Notch pathway, or its mechanism of action. To better understand the role of the Notch pathway in breast cancer, we have undertaken a detailed expression analysis of various Notch receptors, their ligands, and downstream targets at different stages of breast cancer progression.

Results

We report here that there is a general increase in the expression levels of Notch 1, 2, 4, Jagged1, Jagged2, and Delta-like 4 proteins in breast cancers, with simultaneous upregulation of multiple Notch receptors and ligands in a given cancer tissue. While Notch3 and Delta-like1 were undetectable in normal tissues, moderate to high expression was detected in several cancers. We detected the presence of active, cleaved Notch1, along with downstream targets of the Notch pathway, Hes1/Hes5, in ~75% of breast cancers, clearly indicating that in a large proportion of breast cancers Notch signaling is aberrantly activated. Furthermore, we detected cleaved Notch1 and Hes1/5 in early precursors of breast cancers - hyperplasia and ductal carcinoma in situ - suggesting that aberrant Notch activation may be an early event in breast cancer progression. Mechanistically, while constitutively active Notch1 alone failed to transform immortalized breast cells, it synergized with the Ras/MAPK pathway to mediate transformation. This cooperation is reflected in vivo, as a subset of cleaved Notch positive tumors additionally expressed phopsho-Erk1/2 in the nuclei. Such cases exhibited high node positivity, suggesting that Notch-Ras cooperation may lead to poor prognosis.

Conclusions

High level expression of Notch receptors and ligands, and its increased activation in several breast cancers and early precursors, places Notch signaling as a key player in breast cancer pathogenesis. Its cooperation with the Ras/MAPK pathway in transformation offers combined inhibition of the two pathways as a new modality for breast cancer treatment.
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Metadata
Title
Cooperation of Notch and Ras/MAPK signaling pathways in human breast carcinogenesis
Authors
Suruchi Mittal
Deepa Subramanyam
Devaveena Dey
Rekha V Kumar
Annapoorni Rangarajan
Publication date
01-12-2009
Publisher
BioMed Central
Published in
Molecular Cancer / Issue 1/2009
Electronic ISSN: 1476-4598
DOI
https://doi.org/10.1186/1476-4598-8-128

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