期刊
LEUKEMIA
卷 32, 期 3, 页码 654-662出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/leu.2017.296
关键词
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资金
- Associazione Italiana Ricerca Cancro (AIRC) [IG-17622]
- Special-Program-Molecular-Clinical-Oncology [10007, RF-2011-02349712, GR-2011-02346826, GR-2011-02347441, GR-2011-02351370]
- Ministero della Salute, Rome, Italy
- Ricerca clinica/traslazionale/di base/epidemiologica/organizzativa, Regione FVG ('Linfo-Check' Project), Trieste, Italy
- Associazione Italiana contro le Leucemie, linfomi e mielomi (AIL), Venezia Section, Pramaggiore Group, Italy
- Fondazione per la Vita di Pordenone, Italy
- Intramural Program, Centro di Riferimento Oncologico, Aviano, Italy
In chronic lymphocytic leukemia (CLL), stabilizing mutations of NOTCH1, affecting up to 10-15% of cases, have been associated to poor prognosis, disease progression and refractoriness to chemotherapy. NOTCH1 mutations are significantly overrepresented in trisomy 12 CLL, a disease subset frequently expressing CD49d, the alpha 4 chain of the very-late-activation-4 integrin, a well-known key regulator of microenviromental interactions, and negative prognosticator in CLL. In the present study, by analysing a wide cohort of 1180 CLL, we observed a very strong association between the presence of NOTCH1 mutations and the expression of CD49d (P<0.0001), occurring also outside the trisomy 12 CLL subset. Using both the MEC-1 CLL-like cells stably transfected with the NOTCH1 intracellular domain and primary CLL cells bearing a mutated or wild-type NOTCH1 gene configuration, we provide evidence that triggering of the NOTCH1 pathway resulted in a positive CD49d expression regulation, which was driven by a NOTCH1-dependent activation of nuclear factot-kappa B (NF-kappa B). Consistently, pharmacological inhibition of the NOTCH1 and/or of the NF-kappa B pathways resulted in impaired NF-kappa B nuclear translocation with consequent down-modulation of CD49d expression. Altogether, our data link for the first time NOTCH1 mutations to CD49d expression regulation through the involvement of the NF-kappa B pathway in CLL.
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