1. Targeting the MYC interaction network in B-cell lymphoma via histone deacetylase 6 inhibition
- Author
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Winkler, R., Mägdefrau, A.S., Piskor, E.M., Kleemann, M., Beyer, M., Linke, K., Hansen, L., Schaffer, A.M., Hoffmann, M.E., Poepsel, S., Heyd, F., Beli, P., Möröy, T., Mahboobi, S., Krämer, O.H., Kosan, C., and Universitat Autònoma de Barcelona
- Subjects
Cancer Research ,Lymphoma, B-Cell ,MYC interaction network ,Histone Deacetylase 6 ,Histone Deacetylases ,Mice ,Tubulin ,Genetics ,medicine ,Animals ,Humans ,B-cell lymphoma ,Molecular Biology ,Heat-Shock Proteins ,Chemistry ,Cancer ,Acetylation ,Oncogenes ,500 Naturwissenschaften und Mathematik::570 Biowissenschaften ,Biologie::570 Biowissenschaften ,Biologie ,HDAC6 ,HSP40 Heat-Shock Proteins ,medicine.disease ,Lymphoma ,Histone Deacetylase Inhibitors ,Apoptosis ,Cancer cell ,Cancer research ,DNAJA3 ,Transcription Factors - Abstract
RW was supported by a scholarship from the Carl Zeiss Foundation. CK received funding from the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation), GRK 1715. E-MP was supported by a Landesgraduiertenstipendium (Friedrich Schiller University Jena). Work done in the group of OHK was done by MB and is funded by DFG, Project-ID 393547839-SFB 1361 and DFG, GRK 2291/9-1, project number 427404172. Open Access funding enabled and organized by Projekt DEAL. Overexpression of MYC is a genuine cancer driver in lymphomas and related to poor prognosis. However, therapeutic targeting of the transcription factor MYC remains challenging. Here, we show that inhibition of the histone deacetylase 6 (HDAC6) using the HDAC6 inhibitor Marbostat-100 (M-100) reduces oncogenic MYC levels and prevents lymphomagenesis in a mouse model of MYC-induced aggressive B-cell lymphoma. M-100 specifically alters protein-protein interactions by switching the acetylation state of HDAC6 substrates, such as tubulin. Tubulin facilitates nuclear import of MYC, and MYC-dependent B-cell lymphoma cells rely on continuous import of MYC due to its high turn-over. Acetylation of tubulin impairs this mechanism and enables proteasomal degradation of MYC. M-100 targets almost exclusively B-cell lymphoma cells with high levels of MYC whereas non-tumor cells are not affected. M-100 induces massive apoptosis in human and murine MYC-overexpressing B-cell lymphoma cells. We identified the heat-shock protein DNAJA3 as an interactor of tubulin in an acetylation-dependent manner and overexpression of DNAJA3 resulted in a pronounced degradation of MYC. We propose a mechanism by which DNAJA3 associates with hyperacetylated tubulin in the cytoplasm to control MYC turnover. Taken together, our data demonstrate a beneficial role of HDAC6 inhibition in MYC-dependent B-cell lymphoma.
- Published
- 2022