Abstract
Various strains of immune-compromised mice have been developed to investigate human normal and malignant stem cells in vivo. NOD/SCID mice harboring complete null mutation of Il2rg (NSG mice) lack T cells, B cells, and NK cells, and support high levels of engraftment by human cord blood hematopoietic stem cells (CB HSCs) and acute myeloid leukemia stem cells (AML LSCs). In addition to achieving high levels of human hematopoietic cell engraftment, use of newborn NSG mice as recipients has enabled the investigation into how human CB HSCs generate mature immune subsets in vivo. Moreover, through establishing an in vivo model of human primary AML by xenotransplantation of human LSCs into newborn NSG mice, functional properties of human AML such as cell cycle, location, and self-renewal capacity can be examined in vivo. Newborn NSG xenogeneic transplantation model may facilitate the understanding of human normal and malignant hematopoiesis and contribute to the development of novel therapies against hematologic diseases.
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