Abstract
The in vitro effects of the synthetic retinoid N-(4-hydroxyphenyl)retinamide (4HPR, fenretinide) on primary B-cell chronic lymphocytic leukemia (CLL) cells from previously untreated CLL patients were investigated. 4HPR promoted the intrinsic apoptotic pathway by reactive oxygen species (ROS) generation and was accompanied by drop of Mcl-1 protein expression. The latter was not attributable to transcriptional downregulation but to protein degradation mediated by jun N-terminal kinase activation, and likely by NF-kB downregulation and Noxa upregulation. CLL cells stimulated in vitro with CD40L did not increase 4HPR chemoresistance if activation was accompanied by proliferation. Intra-patient analysis confirmed that the proliferating pool of CLL cells was more sensitive to the cytotoxic action of 4HPR than the activated but resting CLL subpopulation. The different 4HPR susceptibility of the two subpopulations was associated with higher Noxa expression in proliferating CLLs. Combination experiments revealed that 4HPR strongly potentiated ABT-737 cytotoxicity, especially in proliferating CLL cells that displayed amplified chemoresistance to ABT-737 alone. Synergic cytotoxicity was also demonstrated in combination with fludarabine, in both resting and stimulated CLL samples. This study entitles 4HPR to be assayed as a chemotherapeutic adjuvant for the treatment of CLL.
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Acknowledgements
This work was supported by grants from Associazione Italiana Ricerca sul Cancro (AIRC) (IG-10698 to FF, RG6432 to FM); Compagnia di San Paolo 4824 SD/CV, 2007.2880 to FF; AIRC-Special Program Molecular Clinical Oncology-‘5 per mille’, grant 9980, 2010-15 to FM; Ricerca Finalizzata from Italian Ministry of Health 2006 to FM; Fondazione Maria Piaggio Casarsa, Genova, Italy to FG; and Fondazione Amelia Scorza onlus, Cosenza, Italy to FM. We would like to thank Fondazione Internazionale di Ricerca in Medicina Sperimentale (FIRMS) that provided financial and administrative assistance.
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Bruno, S., Ghiotto, F., Tenca, C. et al. N-(4-hydroxyphenyl)retinamide promotes apoptosis of resting and proliferating B-cell chronic lymphocytic leukemia cells and potentiates fludarabine and ABT-737 cytotoxicity. Leukemia 26, 2260–2268 (2012). https://doi.org/10.1038/leu.2012.98
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DOI: https://doi.org/10.1038/leu.2012.98
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