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Iida R, Ishida S, Wang J, Hattori K, Yoshimi K, Yamazaki S, Mashimo T. A novel Kit mutant rat enables hematopoietic stem cell engraftment without irradiation. Exp Hematol 2024; 132:104174. [PMID: 38331018 DOI: 10.1016/j.exphem.2024.104174] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2023] [Revised: 01/10/2024] [Accepted: 01/13/2024] [Indexed: 02/10/2024]
Abstract
Hematopoietic stem cell (HSC) transplantation is extensively studied in mouse models, but their limited scale presents challenges for effective engraftment and comprehensive evaluations. Rats, owing to their larger size and anatomical similarity to humans, offer a promising alternative. In this study, we establish a rat model with the KitV834M mutation, mirroring KitW41 mice often used in KIT signaling and HSC research. KitV834M rats are viable and fertile, displaying anemia and mast cell depletion similar to KitW41 mice. The colony-forming unit assay revealed that the KitV834M mutation leads to reduced proliferation and loss of or decreased pluripotency of hematopoietic stem and progenitor cells (HSPCs), resulting in diminished competitive repopulating capacity of KitV834M HSPCs in competitive transplantation assays. Importantly, KitV834M rats support donor rat-HSC engraftment without irradiation. Leveraging the larger scale of this rat model enhances our understanding of HSC biology and transplantation dynamics, potentially advancing our knowledge in this field.
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Affiliation(s)
- Ryuya Iida
- Division of Animal Genetics, Laboratory Animal Research Center, Institute of Medical Science, the University of Tokyo, Tokyo, Japan
| | - Saeko Ishida
- Division of Animal Genetics, Laboratory Animal Research Center, Institute of Medical Science, the University of Tokyo, Tokyo, Japan.
| | - Jinxi Wang
- Division of Animal Genetics, Laboratory Animal Research Center, Institute of Medical Science, the University of Tokyo, Tokyo, Japan
| | - Kosuke Hattori
- Division of Animal Genetics, Laboratory Animal Research Center, Institute of Medical Science, the University of Tokyo, Tokyo, Japan
| | - Kazuto Yoshimi
- Division of Animal Genetics, Laboratory Animal Research Center, Institute of Medical Science, the University of Tokyo, Tokyo, Japan; Division of Genome Engineering, Center for Experimental Medicine and Systems Biology, Institute of Medical Science, University of Tokyo, Tokyo, Japan
| | - Satoshi Yamazaki
- Division of Cell Regulation, Center of Experimental Medicine and Systems Biology, the Institute of Medical Science, the University of Tokyo, Tokyo, Japan; Laboratory of Stem Cell Therapy, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - Tomoji Mashimo
- Division of Animal Genetics, Laboratory Animal Research Center, Institute of Medical Science, the University of Tokyo, Tokyo, Japan; Division of Genome Engineering, Center for Experimental Medicine and Systems Biology, Institute of Medical Science, University of Tokyo, Tokyo, Japan.
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