Abstract:
:T-cell acute lymphoblastic leukemia (T-ALL), unlike other ALL types, is only infrequently associated with chromosomal aberrations, but it was recently shown that most individuals with T-ALL carry activating mutations in the NOTCH1 gene. However, the signaling pathways and target genes responsible for Notch1-induced neoplastic transformation remain undefined. We report here that constitutively active Notch1 activates the NF-kappaB pathway transcriptionally and via the IkappaB kinase (IKK) complex, thereby causing increased expression of several well characterized target genes of NF-kappaB in bone marrow hematopoietic stem cells and progenitors. Our observations demonstrate that the NF-kappaB pathway is highly active in established human T-ALL and that inhibition of the pathway can efficiently restrict tumor growth both in vitro and in vivo. These findings identify NF-kappaB as one of the major mediators of Notch1-induced transformation and suggest that the NF-kappaB pathway is a potential target of future therapies of T-ALL.
journal_name
Nat Medjournal_title
Nature medicineauthors
Vilimas T,Mascarenhas J,Palomero T,Mandal M,Buonamici S,Meng F,Thompson B,Spaulding C,Macaroun S,Alegre ML,Kee BL,Ferrando A,Miele L,Aifantis Idoi
10.1038/nm1524subject
Has Abstractpub_date
2007-01-01 00:00:00pages
70-7issue
1eissn
1078-8956issn
1546-170Xpii
nm1524journal_volume
13pub_type
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