The NFKBIE gene, which encodes the NF-κB inhibitor IκBε, is mutated in 3-7% of patients with chronic lymphocytic leukemia (CLL). The most recurrent alteration is a 4-bp frameshift deletion associated with NF-κB activation in leukemic B cells and poor clinical outcome. To study the functional consequences of NFKBIE gene inactivation, both in vitro and in vivo, we engineered CLL B cells and CLL-prone mice to stably down-regulate NFKBIE expression and investigated its role in controlling NF-κB activity and disease expansion. We found that IκBε loss leads to NF-κB pathway activation and promotes both migration and proliferation of CLL cells in a dose-dependent manner. Importantly, NFKBIE inactivation was sufficient to induce a more rapid expansion of the CLL clone in lymphoid organs and contributed to the development of an aggressive disease with a shortened survival in both xenografts and genetically modified mice. IκBε deficiency was associated with an alteration of the MAPK pathway, also confirmed by RNA-sequencing in NFKBIE-mutated patient samples, and resistance to the BTK inhibitor ibrutinib. In summary, our work underscores the multimodal relevance of the NF-κB pathway in CLL and paves the way to translate these findings into novel therapeutic options.

• MeSH
• adenin analogy a deriváty   farmakologie   MeSH
• chronická lymfatická leukemie * genetika   patologie   metabolismus   farmakoterapie   MeSH
• lidé MeSH
• myši MeSH
• NF-kappa B * metabolismus   MeSH
• piperidiny farmakologie   MeSH
• pohyb buněk MeSH
• proliferace buněk MeSH
• proteiny I-kappa B * genetika   metabolismus   MeSH
• protoonkogenní proteiny genetika   metabolismus   MeSH
• zvířata MeSH
• Check Tag
• lidé MeSH
• myši MeSH
• zvířata MeSH
• Publikační typ
• časopisecké články MeSH
• Názvy látek
• adenin MeSH
• ibrutinib MeSH Prohlížeč
• NF-kappa B * MeSH
• NFKBIE protein, human MeSH Prohlížeč
• piperidiny MeSH
• proteiny I-kappa B * MeSH
• protoonkogenní proteiny MeSH