Spectrum and functional validation of PSMB5 mutations in multiple myeloma

Despite an increasing number of approved therapies, multiple myeloma (MM) remains an incurable disease and only a small number of patients achieve prolonged disease control. Some genes have been linked with response to commonly used anti-MM compounds, including immunomodulators (IMiDs) and proteasom...

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Hauptverfasser: Barrio, Santiago (VerfasserIn) , Giesen, Nicola (VerfasserIn) , Raab, Marc-Steffen (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 2019
In: Leukemia
Year: 2018, Jahrgang: 33, Heft: 2, Pages: 447-456
ISSN:1476-5551
DOI:10.1038/s41375-018-0216-8
Online-Zugang:Verlag, Volltext: https://doi.org/10.1038/s41375-018-0216-8
Verlag: https://www.nature.com/articles/s41375-018-0216-8
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Verfasserangaben:Santiago Barrio, Thorsten Stühmer, Matteo Da-Viá, Clara Barrio-Garcia, Nicola Lehners, Andrej Besse, Isabel Cuenca, Andoni Garitano-Trojaola, Severin Fink, Ellen Leich, Manik Chatterjee, Christoph Driessen, Joaquin Martinez-Lopez, Andreas Rosenwald, Roland Beckmann, Ralf C. Bargou, Esteban Braggio, A. Keith Stewart, Marc S. Raab, Hermann Einsele, K. Martin Kortüm

MARC

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520 |a Despite an increasing number of approved therapies, multiple myeloma (MM) remains an incurable disease and only a small number of patients achieve prolonged disease control. Some genes have been linked with response to commonly used anti-MM compounds, including immunomodulators (IMiDs) and proteasome inhibitors (PIs). In this manuscript, we demonstrate an increased incidence of acquired proteasomal subunit mutations in relapsed MM compared to newly diagnosed disease, underpinning a potential role of point mutations in the clonal evolution of MM. Furthermore, we are first to present and functionally characterize four somatic PSMB5 mutations from primary MM cells identified in a patient under prolonged proteasome inhibition, with three of them affecting the PI-binding pocket S1. We confirm resistance induction through missense mutations not only to Bortezomib, but also, in variable extent, to the next-generation PIs Carfilzomib and Ixazomib. In addition, a negative impact on the proteasome activity is assessed, providing a potential explanation for later therapy-induced eradication of the affected tumor subclones in this patient. 
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