Abstract
NOTCH1 mutations in chronic lymphocytic leukemia (CLL) lead to accumulation of NOTCH1 intracellular domain (NICD) and prolong signaling. These mutations associate with a more aggressive disease compared to wild-type (WT) CLL. In this work we demonstrate a bidirectional functional relationship between NOTCH1 and the B cell receptor (BCR) pathways. By using highly homogeneous cohorts of primary CLL cells, activation of NOTCH1 is shown to increase expression of surface IgM, as well as LYN, BTK, and BLNK, ultimately enhancing BCR signaling responses, including global mRNA translation. Upon BCR cross-linking, NOTCH1 itself is actively translated and increased on cell surface. Furthermore, BCR ligation induces calcium mobilization that can facilitate ligand-independent NOTCH1 activation. These data suggest that the two pathways are functionally linked, providing a rationale for dual inhibition strategies. Consistently, addition of the γ-secretase inhibitor DAPT to ibrutinib significantly potentiates its effects, both in vitro and in a short-term patient-derived xenograft model. While this observation may find limited applications in the CLL field, it is more relevant for Richter’s Syndrome (RS) management, where very few successful therapeutic options exist. Treatment of RS-patient-derived xenografts (RS-PDX) with the combination of ibrutinib and DAPT decreases disease burden and increases overall survival.
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Change history
13 December 2019
A Correction to this paper has been published: https://doi.org/10.1038/s41375-019-0680-9
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Acknowledgements
We thank Dr F. Tito for excellent technical support in IHC staining. This work was carried out in the laboratories of the Italian Institute for Genomic Medicine hosted in the spaces of the Molecular Biotechnology Center of the University of Turin. This work was supported by the Italian Institute for Genomic Medicine Institutional funds (to SD), by the Associazione Italiana per la Ricerca sul Cancro (AIRC IG-17314 to SD, AIRC 5x1000 #21198 to GG), by the Italian Ministry of Health (GR-2011-02346826 to SD), by the Cancer Research UK (C2750/A23669 to GP, C34999/A18087 to FF), by Bloodwise (grants 18009 and 16003 to FF), by the GILEAD Fellowship Program (Gilead Italia 2018 to SD and Gilead UK & Ireland 2016 to FF) by the Keanu Eyles Haematology Fellowship for the Cancer Immunology Centre and by the Ministry of Education, University and Research-MIUR Progetto strategico di Eccellenza Dipartimentale #D15D18000410001 to the Dept. of Medical Sciences, University of Turin.
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FA designed the study, performed experiments, analyzed, and interpreted data and together with SD wrote the paper; VB, NV, KG, and AY performed experiments; TV established RS-PDX models and performed experiments; MC, GD’A, JNA, RRF, and GG: provided patient samples and relevant clinical information and contributed to data interpretation; GP and FF: discussed results and contributed to data interpretation; SD: designed the study, interpreted data and together with FA wrote the paper.
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Arruga, F., Bracciamà, V., Vitale, N. et al. Bidirectional linkage between the B-cell receptor and NOTCH1 in chronic lymphocytic leukemia and in Richter’s syndrome: therapeutic implications. Leukemia 34, 462–477 (2020). https://doi.org/10.1038/s41375-019-0571-0
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DOI: https://doi.org/10.1038/s41375-019-0571-0
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