Abstract
We have reported previously that R-enantiomer of etodolac (R-etodolac), which is under investigation in phase 2 clinical trials in chronic lymphocytic leukemia, induces potent cytotoxicity at clinically relevant concentrations in multiple myeloma (MM) cells. In this study, we demonstrated that SDX-308 (CEP-18082), a novel analog of etodolac, has more potent cytotoxicity than R-etodolac against both MM cell lines and patient MM cells, including tumor cells resistant to conventional (dexamethasone, doxorubicine, melphalan) and novel (bortezomib) therapies. SDX-308-induced cytotoxicity is triggered by caspase-8/9/3 activation and poly (ADP-ribose) polymerase cleavage, followed by apoptosis. SDX-308 significantly inhibits β-catenin/T-cell factor pathway by inhibiting nuclear translocation of β-catenin, thereby downregulating transcription and expression of downstream target proteins including myc and survivin. Neither interleukin-6 nor insulin-like growth factor-1 protect against growth inhibition triggered by SDX-308. Importantly, growth of MM cells adherent to bone marrow (BM) stromal cells is also significantly inhibited by SDX-308. Our data therefore indicate that the novel etodolac analog SDX-308 can target MM cells in the BM milieu.
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Acknowledgements
This study is supported by National Institutes of Health (NIH) SPORE IP50 CA10070, PO-1 78378 and RO-1 CA 50947 Grants; the Doris Duke Distinguished Clinical Research Scientist Award (KCA); the Multiple Myeloma Research Foundation (TH); and the Lebow Family Fund to Cure Myeloma (KCA). SDX-308 (CEP-18082) is provided by Salmedix Inc. now doing business as Cephalon, Inc.
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Yasui, H., Hideshima, T., Ikeda, H. et al. Novel etodolac analog SDX-308 (CEP-18082) induces cytotoxicity in multiple myeloma cells associated with inhibition of β-catenin/TCF pathway. Leukemia 21, 535–540 (2007). https://doi.org/10.1038/sj.leu.2404561
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DOI: https://doi.org/10.1038/sj.leu.2404561
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