Abstract
Purpose
The BCL-2 family of anti-apoptotic proteins, BCL-2, BCL-XL and MCL-1, can mediate survival of some types of cancer. DT2216 is a PROteolysis-TArgeting Chimera (PROTAC) that degrades BCL-XL specifically and is in phase 1 trials. We sought to define the frequency and mechanism of resistance to DT2216 in T-cell acute lymphoblastic leukemia (T-ALL) cell lines.
Methods
We measured cell survival and protein levels of BCL-XL, BCL-2, MCL-1 and the pro-apoptotic BIM in 13 distinct T-ALL cell lines after exposure to varying concentrations of DT2216.
Results
We identified concentrations of DT2216 which were cytotoxic to each T-ALL cell line.
These concentrations have no correlation with the initial protein levels of BCL-XL, BCL-2, MCL-1 or BIM in each cell line. However, there was a correlation between survival to DT2216 and the efficiency of degradation of BCL-XL by DT2216. Only one cell line, SUP-T1, had significant resistance to DT2216, defined as an IC50 above what is achievable in murine tumors in vivo.
Conclusion
Resistance to DT2216 is rare in a wide variety of T-ALL cells but when it occurs is correlated with decreased BCL-XL degradation. Resistance to DT2216 in T-ALL is not predicted by initial BCL-XL or BIM protein levels, or BCL-2 or MCL-1 levels before or after treatment. These data imply that a phase 2 clinical trial of DT2216 in T-ALL should be widely available and not limited to a subset of patients.
Data availability
All data generated or analyzed during this study are included in this published article and its supplementary information files.
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Acknowledgements
Funding from US National Institutes of Health (NIH) grant R01 CA242003 (D.Z. and G.Z.), RO1 CA205224 (R.H.) and the Cancer Prevention of Research Institute of Texas Individual Investigator grant RP220269.
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Arunima Jaiswal designed and performed experiments, Aruna Jaiswal and Elizabeth Williamson supervised experiments and edited the manuscript, Jonathon Gelfond performed the statistical analysis, Guangrong Zheng and Daohong Zhou designed experiments and edited the manuscript and Robert Hromas designed and supervised experiments and edited the manuscript.
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G.Z. and D.Z. hold patents for use of BCL-XL PROTACs as senolytic and antitumor agents. G.Z., D.Z., and R.H. have equity in Dialectic Therapeutics, which owns the license for DT2216.
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Jaiswal, A., Jaiswal, A., Williamson, E.A. et al. Resistance to the BCL-XL degrader DT2216 in T-cell acute lymphoblastic leukemia is rare and correlates with decreased BCL-XL proteolysis. Cancer Chemother Pharmacol 91, 89–95 (2023). https://doi.org/10.1007/s00280-022-04490-8
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DOI: https://doi.org/10.1007/s00280-022-04490-8