Abstract
The pharmacological induction of apoptosis in neoplastic B cells presents a promising therapeutic avenue for the treatment of chronic lymphocytic leukemia (CLL). We profiled a panel of clinical multi-kinase inhibitors for their ability to induce apoptosis in primary CLL cells. Whereas inhibitors targeting a large number of receptor and intracellular tyrosine kinases including c-KIT, FLT3, BTK and SYK were comparatively inactive, the CDK inhibitors BMS-387032 and flavopiridol showed marked efficacy similar to staurosporine. Using the kinobeads proteomics method, kinase expression profiles and binding profiles of the inhibitors to target protein complexes were quantitatively monitored in CLL cells. The targets most potently affected were CDK9, cyclin T1, AFF3/4 and MLLT1, which may represent four subunits of a deregulated positive transcriptional elongation factor (p-TEFb) complex. Albeit with lower potency, both drugs also bound the basal transcription factor BTF2/TFIIH containing CDK7. Staurosporine and geldanamycin do not affect these targets and thus seem to exhibit a different mechanism of action. The data support a critical role of p-TEFb inhibitors in CLL that supports their future clinical development.
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Acknowledgements
We are thankful to Reinhild Brinker, Anja Podszuweit and Jessica Perrin for expert technical assistance, to Valérie Reader for compound synthesis, to Judith Schlegl, Christine Gmünd and Vincent Wolowski for software and database development, and to Yann Abraham for help with data analysis. We also thank Frank Weisbrodt for help with the figures. We would like to thank Tim Edwards, Jason Fisherman, Carsten Hopf, Gitte Neubauer and David Simmons for suggestions and support. This work was supported by a grant from the German Bundesministerium für Bildung und Forschung (Spitzencluster BioRN, Verbundprojekt Inkubator/Teilprojekt BioRN-IND-TP02) to Cellzome AG. CPP and CMW were supported by the Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), Köln Fortune, the CLL Global Research Foundation, and the Marga and Walter Boll-Stiftung.
Author contributions
UK, CPP and MB designed and performed research, analyzed data and wrote the paper; DE, LF, SKM, SG and TW performed research; CMW provided CLL patient samples and wrote the paper; GD conceptualized the project, analyzed data and wrote the paper.
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UK, MB, DE, SG, TW and GD are employees of Cellzome AG. CPP and CMW received research funding from Cellzome AG. All the authors declare no other conflict of interest.
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Kruse, U., Pallasch, C., Bantscheff, M. et al. Chemoproteomics-based kinome profiling and target deconvolution of clinical multi-kinase inhibitors in primary chronic lymphocytic leukemia cells. Leukemia 25, 89–100 (2011). https://doi.org/10.1038/leu.2010.233
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DOI: https://doi.org/10.1038/leu.2010.233
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