title: Alterations of the Notch pathway in lung cancer.
abstract: Notch signaling regulates cell specification and homeostasis of stem cell compartments, and it is counteracted by the cell fate determinant Numb. Both Numb and Notch have been implicated in human tumors. Here, we show that Notch signaling is altered in approximately one third of non-small-cell lung carcinomas (NSCLCs), which are the leading cause of cancer-related deaths: in approximately 30% of NSCLCs, loss of Numb expression leads to increased Notch activity, while in a smaller fraction of cases (around 10%), gain-of-function mutations of the NOTCH-1 gene are present. Activation of Notch correlates with poor clinical outcomes in NSCLC patients without TP53 mutations. Finally, primary epithelial cell cultures, derived from NSCLC harboring constitutive activation of the Notch pathway, are selectively killed by inhibitors of Notch (gamma-secretase inhibitors), showing that the proliferative advantage of these tumors is dependent upon Notch signaling. Our results show that the deregulation of the Notch pathway is a relatively frequent event in NSCLCs and suggest that it might represent a possible target for molecular therapies in these tumors.
authors.affiliation: IFOM, Fondazione Istituto FIRC di Oncologia Molecolare, Milan, Italy.
authors.forename: Britta
authors.initials: B
authors.lastname: Westhoff
authors.forename: Ivan N
authors.initials: IN
authors.lastname: Colaluca
authors.forename: Giovanni
authors.initials: G
authors.lastname: D'Ario
authors.forename: Maddalena
authors.initials: M
authors.lastname: Donzelli
authors.forename: Daniela
authors.initials: D
authors.lastname: Tosoni
authors.forename: Sara
authors.initials: S
authors.lastname: Volorio
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Pelosi
authors.forename: Lorenzo
authors.initials: L
authors.lastname: Spaggiari
authors.forename: Giovanni
authors.initials: G
authors.lastname: Mazzarol
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Viale
authors.forename: Salvatore
authors.initials: S
authors.lastname: Pece
authors.forename: Pier Paolo
authors.initials: PP
authors.lastname: Di Fiore
mesh_terms: D000368:Aged; D001483:Base Sequence; D051792:Basic Helix-Loop-Helix Proteins / Q000235:genetics / Q000378:metabolism; D002289:Carcinoma, Non-Small-Cell Lung / Q000235:genetics / Q000378:metabolism* / Q000473:pathology; D004252:DNA Mutational Analysis; D004273:DNA, Neoplasm / Q000235:genetics; D005260:Female; D015870:Gene Expression; D018398:Homeodomain Proteins / Q000235:genetics / Q000378:metabolism; D006801:Humans; D008175:Lung Neoplasms / Q000235:genetics / Q000378:metabolism* / Q000473:pathology; D008297:Male; D008565:Membrane Proteins / Q000235:genetics / Q000378:metabolism; D008875:Middle Aged; D009154:Mutation; D009419:Nerve Tissue Proteins / Q000235:genetics / Q000378:metabolism; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D012334:RNA, Neoplasm / Q000235:genetics / Q000378:metabolism; D051881:Receptor, Notch1 / Q000235:genetics / Q000378:metabolism; D051880:Receptors, Notch / Q000235:genetics / Q000378:metabolism*; D015398:Signal Transduction; D000072056:Transcription Factor HES-1; D014407:Tumor Cells, Cultured
chemical_list: D051792:Basic Helix-Loop-Helix Proteins; D004273:DNA, Neoplasm; D018398:Homeodomain Proteins; D008565:Membrane Proteins; D009419:Nerve Tissue Proteins; D012333:RNA, Messenger; D012334:RNA, Neoplasm; D051881:Receptor, Notch1; D051880:Receptors, Notch; D000072056:Transcription Factor HES-1; C497761:NOTCH1 protein, human; C113026:NUMB protein, human; C078493:HES1 protein, human