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Colaluca, I.N.* ; Basile, A.* ; Freiburger, L. ; D'Uva, V.* ; Disalvatore, D.* ; Vecchi, M.* ; Confalonieri, S.* ; Tosoni, D.* ; Cecatiello, V.* ; Malabarba, M.G.* ; Yang, C.J.* ; Kainosho, M.* ; Sattler, M. ; Mapelli, M.* ; Pece, S.* ; di Fiore, P.P.*

A Numb-Mdm2 fuzzy complex reveals an isoform-specific involvement of Numb in breast cancer.

J. Cell Biol. 217, 745-762 (2018)
Verlagsversion DOI PMC
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Numb functions as an oncosuppressor by inhibiting Notch signaling and stabilizing p53. This latter effect depends on the interaction of Numb with Mdm2, the E3 ligase that ubiquitinates p53 and commits it to degradation. In breast cancer (BC), loss of Numb results in a reduction of p53-mediated responses including sensitivity to genotoxic drugs and maintenance of homeostasis in the stem cell compartment. In this study, we show that the Numb-Mdm2 interaction represents a fuzzy complex mediated by a short Numb sequence encompassing its alternatively spliced exon 3 (Ex3), which is necessary and sufficient to inhibit Mdm2 and prevent p53 degradation. Alterations in the Numb splicing pattern are critical in BC as shown by increased chemoresistance of tumors displaying reduced levels of Ex3-containing isoforms, an effect that could be mechanistically linked to diminished p53 levels. A reduced level of Ex3-less Numb isoforms independently predicts poor outcome in BCs harboring wild-type p53. Thus, we have uncovered an important mechanism of chemoresistance and progression in p53-competent BCs.
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Publikationstyp Artikel: Journalartikel
Dokumenttyp Wissenschaftlicher Artikel
Schlagwörter Cell Fate; Mammalian Numb; Lung-cancer; Ubiquitin Ligase; Nmr Experiments; Histone H2ax; P53 Pathway; Case-cohort; Dna-damage; Mdm2
Sprache englisch
Veröffentlichungsjahr 2018
Prepublished im Jahr 2017
HGF-Berichtsjahr 2017
ISSN (print) / ISBN 0021-9525
e-ISSN 1540-8140
Zeitschrift Journal of Cell Biology, The
Quellenangaben Band: 217, Heft: 2, Seiten: 745-762 Artikelnummer: , Supplement: ,
Verlag Rockefeller University Press
Verlagsort New York
Begutachtungsstatus Peer reviewed
Institut(e) Institute of Structural Biology (STB)
POF Topic(s) 30203 - Molecular Targets and Therapies
Forschungsfeld(er) Enabling and Novel Technologies
PSP-Element(e) G-503000-001
DOI 10.1083/jcb.201709092
WOS ID WOS:000424514100028
Scopus ID 85041656300
PubMed ID 29269425
Erfassungsdatum 2018-02-21
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