Abstract
Activated B-cell-like diffuse large B-cell lymphoma (ABC-DLBCL) is driven by aberrant activation of the B-cell receptor (BCR) and the TLR/MyD88 signaling pathways. The heat-shock protein HSP110 is a candidate for their regulation as it stabilizes MyD88. However, its role in overall BCR signaling remains unknown. Here, we used first-in-class HSP110 inhibitors to address this question. HSP110 inhibitors decreased the survival of several ABC-DLBCL cell lines in vitro and in vivo, and reduced the phosphorylation of BCR signaling kinases, including BTK and SYK. We identified an interaction between HSP110 and SYK and demonstrated that HSP110 promotes SYK phosphorylation. Finally, the combination of the HSP110 inhibitor with the PI3K inhibitor copanlisib decreases SYK/BTK and AKT phosphorylation synergistically, leading to suppression of tumor growth in cell line xenografts and strong reduction in patient-derived xenografts. In conclusion, by regulating the BCR/TLR signaling pathway, HSP110 inhibitors are potential drug candidates for ABC-DLBCL patients.
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Full materials, methods and data may be shared after request to the corresponding author by e-mail gaetan.jego@u-bourogne.fr.
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Acknowledgements
This work was supported by grants from the Ligue Nationale Contre le Cancer EL2023 LNCC/CaG (GJ and CG), from the Fondation ARC pour la recherche sur le Cancer (GJ), the French National Research Agency (ANR) under the program “Investissements d’Avenir” with reference ANR-11-LABX-0021 (LabEX LipSTIC), ANR-11-LABX-0051 (Labex GR-Ex) and ANR-15-IDE-0003 (I-SITE-BFC), the Conseil Regional de Bourgogne, We also thank the FEDER for their support. This work was also possible with help from Flow Cytometry Core Facility/Inserm UMR1231, at the University of Burgundy.
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VCG, MD, CB, FH, KN, PK and GJ designed the study and experiments; VCG, MD, CB, FH, KN, and MA performed the experiments; CCC and CG provided samples and expertise; VCG, MD, CB, FH, CCC, MA, PK, CG, GJ analyzed the experiments; GJ directed the work.
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Gibouin, V.C., Durand, M., Boudesco, C. et al. First-in-class inhibitor of HSP110 blocks BCR activation through SYK phosphorylation in diffuse large B-cell lymphoma. Leukemia 38, 1742–1750 (2024). https://doi.org/10.1038/s41375-024-02302-x
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DOI: https://doi.org/10.1038/s41375-024-02302-x
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