Abstract:
:Oncogenic activation of NOTCH1 signaling plays a central role in the pathogenesis of T-cell acute lymphoblastic leukemia, with mutations on this signaling pathway affecting more than 60% of patients at diagnosis. However, the transcriptional regulatory circuitries driving T-cell transformation downstream of NOTCH1 remain incompletely understood. Here we identify Hairy and Enhancer of Split 1 (HES1), a transcriptional repressor controlled by NOTCH1, as a critical mediator of NOTCH1-induced leukemogenesis strictly required for tumor cell survival. Mechanistically, we demonstrate that HES1 directly downregulates the expression of BBC3, the gene encoding the PUMA BH3-only proapoptotic factor in T-cell acute lymphoblastic leukemia. Finally, we identify perhexiline, a small-molecule inhibitor of mitochondrial carnitine palmitoyltransferase-1, as a HES1-signature antagonist drug with robust antileukemic activity against NOTCH1-induced leukemias in vitro and in vivo.
journal_name
Bloodjournal_title
Bloodauthors
Schnell SA,Ambesi-Impiombato A,Sanchez-Martin M,Belver L,Xu L,Qin Y,Kageyama R,Ferrando AAdoi
10.1182/blood-2014-10-608448subject
Has Abstractpub_date
2015-04-30 00:00:00pages
2806-14issue
18eissn
0006-4971issn
1528-0020pii
blood-2014-10-608448journal_volume
125pub_type
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