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Pharmacology

Thiopurine-mediated impairment of hematopoietic stem and leukemia cells in Nudt15R138C knock-in mice

Abstract

Thiopurines are widely used as antileukemia agents and immunosuppressants. Recent large-scale clinical studies revealed a strong association between the NUDT15 p.Arg139Cys (NUDT15R139C) polymorphism and severe thiopurine-induced leukocytopenia. We established knock-in mice harboring p.Arg138Cys (Nudt15R138C), which corresponds to the human polymorphism. A clinically relevant dose of mercaptopurine (MP) induced lethal cytopenia in Nudt15R138C-harboring mice. MP dose reduction attenuated the hematopoietic toxicity, phenocopying clinical observations and providing Nudt15 genotype-based tolerable doses of MP. High-dose MP induced acute damage to hematopoietic stem and progenitor cells (HSPCs) in Nudt15R138C/R138C mice. A competitive transplantation assay revealed that not only Nudt15R138C/R138C HSPCs, but also Nudt15+/R138C HSPCs suffered stronger damage than Nudt15+/+ HSPCs, even by lower-dose MP, after long-term administration. In a Nudt15 genotype-based posttransplantation leukemia recurrence model generated by bone marrow replacement with congenic wild-type cells and a small number of leukemia stem cells, MP prolonged the survival of mice with posttransplantation Nudt15R138C/R138C leukemia recurrence. In conclusion, our model will facilitate NUDT15 genotype-based precision medicine by providing safer estimates for MP dosing, and our findings highlighted the high susceptibility of hematopoietic stem cells to MP and suggested that exploiting thiopurine toxicity might be a novel treatment approach for leukemia in NUDT15R139C-harboring patients.

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Acknowledgements

We thank the Central Research Laboratory of Shiga University of Medical Science, particularly Yasuhiro Mori for technical support with FACS analyses and sorting and Takefumi Yamamoto for technical support with mouse irradiation. This work was supported by JSPS KAKENHI Grant Number JP16K09846 (MK) and the Takeda Science Foundation (MK).

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GT maintained the mouse strains and performed transplantation and FACS sorting and analyses. MK designed the mouse model, conducted all experiments, analyzed data, provided funding and wrote the paper. TI maintained the mouse strains and performed histology and cytology experiments. AN designed the mouse model. AA-N performed some cytology experiments and FACS analyses. OI edited the paper. AY provided the MLL-AF9 vector and helped the establishment of leukemia model. YK, KK, and AA wrote and edited the paper.

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Correspondence to Masahiro Kawahara.

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Tatsumi, G., Kawahara, M., Imai, T. et al. Thiopurine-mediated impairment of hematopoietic stem and leukemia cells in Nudt15R138C knock-in mice. Leukemia 34, 882–894 (2020). https://doi.org/10.1038/s41375-019-0583-9

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