ABL tyrosine kinase inhibitors (TKIs) have demonstrated potency in the treatment of chronic myeloid leukemia (CML) patients. However, resistance to ABL TKIs can develop in CML patients due to BCR-ABL point mutations. Furthermore, CUDC-907 is an oral inhibitor of class I phosphoinositide 3-kinase (PI3K) as well as class I and II histone deacetylase (HDAC) enzymes.
In this study, we evaluated the effect of combination therapy of CUDC-907 and ABL TKIs, using BCR-ABL-positive cell lines and primary samples.
CUDC-907 treatment for 72 h resulted in cell growth inhibition. Over the same period, an increase in histone acetylation and both caspase three and poly (ADP-ribose) polymerase (PARP) enzyme activity was observed. When ABL TKI treatment and CUDC-907 treatment were combined, significantly greater cytotoxicity was observed. Moreover, combined oral therapy with ponatinib (20 mg/kg/day) and CUDC-907 (30 mg/kg/day) greatly inhibited tumor growth compared to each drug alone. Lastly, CUDC-907 treatment also inhibited the growth of Ba/F3 ponatinib-resistant cells, K562 nilotinib-resistant cells, and T315I mutant primary samples.
Taken together, our results indicate that administration of CUDC-907, a dual PI3K and HDAC inhibitor, may be an effective strategy against ABL TKI-resistant cells, including cells harboring the T315I mutation. Moreover, CUDC-907 may enhance the cytotoxic effects of ABL TKI when a combined treatment strategy is used against Philadelphia chromosome-positive leukemia cells.
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This work was supported by a High-Tech Research Center Project for Private Universities, a matching fund subsidy from the Ministry of Education, Culture, Sports, Science, and Technology (MEXT) and the University-Industry Joint Research Project for Private Universities, a matching fund subsidy from MEXT. This work was also supported by Grants-in-Aid for Scientific Research from MEXT. We also thank the Tokyo Medical University Research Center for providing technical support.
This work was supported by Grants-in-Aid for Scientific Research from MEXT (Grant number 17K07227).
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The authors declare that they have no conflict of interest.
The study was approved by the local institute committee.
Informed consent was obtained from all individual participants included in the study.
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Okabe, S., Tanaka, Y., Moriyama, M. et al. Effect of dual inhibition of histone deacetylase and phosphatidylinositol-3 kinase in Philadelphia chromosome-positive leukemia cells. Cancer Chemother Pharmacol 85, 401–412 (2020). https://doi.org/10.1007/s00280-019-04022-x
- ABL tyrosine kinase inhibitor
- Chronic myeloid leukemia
- Histone deacetylase
- Phosphatidylinositol-3 kinase
- Resistant cell