Abstract:
:Mammary epithelial stem cells are fundamental to maintain tissue integrity. Cancer stem cells (CSCs) are implicated in both treatment resistance and disease relapse, and the molecular bases of their malignant properties are still poorly understood. Here we show that both normal stem cells and CSCs of the breast are controlled by the prolyl-isomerase Pin1. Mechanistically, following interaction with Pin1, Notch1 and Notch4, key regulators of cell fate, escape from proteasomal degradation by their major ubiquitin-ligase Fbxw7α. Functionally, we show that Fbxw7α acts as an essential negative regulator of breast CSCs' expansion by restraining Notch activity, but the establishment of a Notch/Pin1 active circuitry opposes this effect, thus promoting breast CSCs self-renewal, tumor growth and metastasis in vivo. In human breast cancers, despite Fbxw7α expression, high levels of Pin1 sustain Notch signaling, which correlates with poor prognosis. Suppression of Pin1 holds promise in reverting aggressive phenotypes, through CSC exhaustion as well as recovered drug sensitivity carrying relevant implications for therapy of breast cancers.
journal_name
EMBO Mol Medjournal_title
EMBO molecular medicineauthors
Rustighi A,Zannini A,Tiberi L,Sommaggio R,Piazza S,Sorrentino G,Nuzzo S,Tuscano A,Eterno V,Benvenuti F,Santarpia L,Aifantis I,Rosato A,Bicciato S,Zambelli A,Del Sal Gdoi
10.1002/emmm.201302909subject
Has Abstractpub_date
2014-01-01 00:00:00pages
99-119issue
1eissn
1757-4676issn
1757-4684pii
emmm.201302909journal_volume
6pub_type
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