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- W2067114333 abstract "Transplantation of human hematopoietic stem cells into severely immunocompromised newborn mice allows the development of a human hematopoietic and immune system in vivo. NOD/scid/γ c −/− (NSG) and BALB/c Rag2 −/− γ c −/− mice are the most commonly used mouse strains for this purpose and a number of studies have demonstrated the high value of these model systems in areas spanning from basic to translational research. However, limited cross-reactivity of many murine cytokines on human cells and residual host immune function against the xenogeneic grafts results in defective development and maintenance of human cells in vivo. Whereas NSG mice have higher levels of absolute human engraftment than similar mice on a BALB/c background, they have a shorter lifespan and NOD ES cells are unsuitable for the complex genetic engineering that is required to improve human hematopoiesis and immune responses by transgenesis or knockin of human genes. We have generated mice that faithfully express a transgene of human signal regulatory protein alpha (SIRPa), a receptor that negatively regulates phagocytosis, in Rag2 −/− γ c −/− mice on a mixed 129/BALB/c background, which can easily be genetically engineered. These mice allow significantly increased engraftment and maintenance of human hematopoietic cells reaching levels comparable to NSG mice. Furthermore, we found improved functionality of the human immune system in these mice. In summary, hSIRPa-transgenic Rag2 −/− γ c −/− mice represent a unique mouse strain supporting high levels of human cell engraftment, which can easily be genetically manipulated." @default.
- W2067114333 created "2016-06-24" @default.
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- W2067114333 date "2011-07-25" @default.
- W2067114333 modified "2023-10-02" @default.
- W2067114333 title "Transgenic expression of human signal regulatory protein alpha in Rag2 <sup>−/−</sup> γ <sub>c</sub> <sup>−/−</sup> mice improves engraftment of human hematopoietic cells in humanized mice" @default.
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- W2067114333 doi "https://doi.org/10.1073/pnas.1109769108" @default.
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