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Prukova, Dana; Andera, Ladislav; Nahacka, Zuzana; Karolova, Jana; Svaton, Michael; Klanova, Magdalena; Havranek, Ondrej; Soukup, Jan; Svobodova, Karla; Zemanova, Zuzana; Tuskova, Diana; Pokorna, Eva; Helman, Karel; Forsterova, Kristina; Pacheco-Blanco, Mariana; Vockova, Petra; Berkova, Adela; Fronkova, Eva; Trneny, Marek; Klener, Pavel
Clinical cancer research, 07/2019, Letnik: 25, Številka: 14Journal Article
Mantle cell lymphoma (MCL) is an aggressive subtype of B-cell non-Hodgkin lymphomas characterized by (over)expression of BCL2. A BCL2-targeting drug, venetoclax, has promising anticancer activity in MCL. We analyzed molecular mechanisms of venetoclax resistance in MCL cells and tested strategies to overcome it. We confirmed key roles of proapoptotic proteins BIM and NOXA in mediating venetoclax-induced cell death in MCL. Both BIM and NOXA are, however, differentially expressed in cell lines compared with primary cells. First, NOXA protein is significantly overexpressed in most MCL cell lines. Second, deletions of gene harbored by three commonly used MCL cell lines (JEKO-1, MINO, and Z138) were not found by array comparative genomic hybridization using a validation set of 24 primary MCL samples. We demonstrated that MCL1 and NOXA play important roles in mediating resistance to venetoclax. Consequently, we tested an experimental treatment strategy based on cotargeting BCL2 with venetoclax and MCL1 with a highly specific small-molecule MCL1 inhibitor S63845. The combination of venetoclax and S63845 demonstrated synthetic lethality on a panel of five patient-derived xenografts established from patients with relapsed MCL with adverse cytogenetics. Our data strongly support investigation of venetoclax in combination with S63845 as an innovative treatment strategy for chemoresistant MCL patients with adverse cytogenetics in the clinical grounds.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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Vir: Osebne bibliografije
in: SICRIS
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