Abstract
The chromatin-associated AAA+ ATPases Tip48 and Tip49 are the core components of various complexes implicated in diverse nuclear events such as DNA repair and gene regulation. Although they are frequently overexpressed in many human cancers, their functional significance remains unclear. Here, we show that loss of Tip49 triggered p53-dependent apoptosis and inhibited leukemia development in vivo. To examine the impact of chemical inhibition of this complex on leukemia, we have developed the novel compound DS-4950, which interferes with the ATPase activity of the Tip48/49. Administration of DS-4950 was well-tolerated in healthy mice, and the drug effectively reduced tumor burden and improved survival. We also provide evidence that the dependency on Tip48/49 is widely conserved in non-hematologic malignancies with wild type p53. These results demonstrated that the Tip48/49 ATPases are functionally necessary and therapeutically targetable for the treatment of human cancers.
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Acknowledgements
We thank Dr. Toshio Imai at the Central Animal Division for maintaining animals, Dr. Masamichi Ishiai at The Central Radioisotope Division for advice on radioisotope use, Rie Sawado and Yukiko Aikawa for technical help, and Drs. Takahiro Ito and Myriam Y Hsu for comments on the manuscript. This work was supported by AMED (JP19cm0106141 and JP21cm010617), JSPS KAKENHI (JP22H03103), the Japan Science and Technology Agency (grant JPMJMS2022-16) and Project for Cancer Research and Therapeutic Evolution (P-CREATE).
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AH designed the study, performed all experiments, analyzed the data, and wrote the manuscript. ET-I generated Tip48 and Tip49 cKO mice. YY performed western blotting, immunofluorescence, and bioinformatics analysis. SF and YM performed part of drug treatment analysis. RM provided the compound. KY, TK and HS contributed essential reagents. IK conceived and supervised the project. All authors read and edited manuscript.
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RM is an employee of Daiichi Sankyo, Co., Ltd. All other authors declare no conflict of interest.
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Hattori, A., Takamatsu-Ichihara, E., Yamamoto, Y. et al. Genetic and chemical targeting of the ATPase complex TIP48 and 49 impairs acute myeloid leukemia. Leukemia 37, 1812–1829 (2023). https://doi.org/10.1038/s41375-023-01971-4
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DOI: https://doi.org/10.1038/s41375-023-01971-4