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Furuya K, Zheng YW, Ge JY, Zhang L, Furuta T, Liang C, Abe H, Yagi H, Hamada H, Isoda H, Hui L, Ohkohchi N, Oda T. The evidence of a macrophage barrier in the xenotransplantation of human hematopoietic stem cells to severely immunodeficient rats. Xenotransplantation 2021; 28:e12702. [PMID: 34145650 DOI: 10.1111/xen.12702] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2021] [Revised: 04/15/2021] [Accepted: 06/02/2021] [Indexed: 11/29/2022]
Abstract
BACKGROUND The human-to-rat hematopoietic stem cell transplantation (HSCT) model is rare, unlike its human-to-mouse counterpart. The rat models are desired, especially in areas of physiology, toxicology, and pharmacology. In addition to lymphocytes, macrophages are also considered to be important for xenotransplantation. We generated a rat xenotransplantation model to prove the role of macrophages as a xenotransplantation barrier. METHODS Immunodeficiency in SRG rats, which are Sprague-Dawley (SD) rats lacking Rag2 and Il2rg, was confirmed by flow cytometry and spleen immunostaining. Human umbilical cord blood was collected after scheduled cesarean section at the University of Tsukuba Hospital. Cord blood mononuclear cells (CB-MNCs) were transplanted into the SRG rats administered several injections of clodronate liposome (CL), which cause macrophage depletion. Survival of human cells was observed by flow cytometry. Rat macrophage phagocytosis assay was performed to check the species-specific effects of rat macrophages on injected human/rat blood cells. RESULTS SRG rats were deficient in T/B/NK cells. Without CL pretreatment, human CB-MNCs were removed from SRG rats within 7 hours after transplantation. The rats pretreated with CL could survive after transplantation. Prolonged survival for more than 4 weeks was observed only following a one-time CL injection. Rat macrophages had a species-specific potential for the phagocytosis of human blood cells in vivo. CONCLUSION In human-to-rat HSCT, the short period of early macrophage control, leading to macrophage immunotolerance, is important for engraftment. The generated model can be useful for the creation of future xenotransplantation models or other clinical research.
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Affiliation(s)
- Kinji Furuya
- Department of Gastrointestinal and Hepato-Biliary-Pancreatic Surgery, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - Yun-Wen Zheng
- Department of Gastrointestinal and Hepato-Biliary-Pancreatic Surgery, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan.,Guangdong Provincial Key Laboratory of Large Animal Models for Biomedicine and School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, China.,Institute of Regenerative Medicine and Affiliated Hospital of Jiangsu University, Jiangsu University, Zhenjiang, China.,Department of Regenerative Medicine, School of Medicine, Yokohama City University, Yokohama, Japan
| | - Jian-Yun Ge
- Department of Gastrointestinal and Hepato-Biliary-Pancreatic Surgery, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan.,Guangdong Provincial Key Laboratory of Large Animal Models for Biomedicine and School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, China
| | - Ludi Zhang
- State Key Laboratory of Cell Biology, Shanghai Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, University of Chinese Academy of Science, Shanghai, China
| | - Tomoaki Furuta
- Department of Gastrointestinal and Hepato-Biliary-Pancreatic Surgery, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - Chen Liang
- Department of Gastrointestinal and Hepato-Biliary-Pancreatic Surgery, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - Haruna Abe
- Department of Obstetrics and Gynecology, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - Hiroya Yagi
- Department of Obstetrics and Gynecology, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - Hiromi Hamada
- Department of Obstetrics and Gynecology, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - Hiroko Isoda
- Faculty of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Japan
| | - Lijian Hui
- State Key Laboratory of Cell Biology, Shanghai Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, University of Chinese Academy of Science, Shanghai, China
| | - Nobuhiro Ohkohchi
- Department of Gastrointestinal and Hepato-Biliary-Pancreatic Surgery, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - Tatsuya Oda
- Department of Gastrointestinal and Hepato-Biliary-Pancreatic Surgery, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
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