Abstract
Humanized mice allow the development of human immune system in the host and facilitate in vivo human hematology and immunology research. Engraftment of human hematopoietic stem cell (HSC)/(HPC) into these host mice provides long-term multilineage hematopoiesis and generation of human immune responses against a variety of antigens including HIV.
Development of such mice has been mainly based on the recombination activating genes 1 and 2 (Rag1 and Rag2) deficient or severe combined immune deficiency (scid) mice, and the immunodeficiency had been considered responsible for the engraftment of human hematopoietic tissues. While some scid mice will spontaneously develop partial immune reactivity, display “leaky” phenotype, Rag1 or Rag2 deficient mice show a “nonleaky” phenotype. However, xenoengraftment of human hematopoietic tissue into the Rag1- or Rag2-based mice are not superior to scid-based mice. Furthermore, wild-type HSCs can significantly engraft into unconditioned scid mice, compared to Rag1 −/− mice, suggesting that immunodeficiency itself may not be the primary characteristic permitting engraftment in scid mice. We proposed that a defect in bone marrow (BM) hematopoietic niche occupancy of scid HSCs contributes to the conduciveness of engraftment by exogenous HSCs, including human HSCs.
In this chapter, we discuss the mechanism by which scid mice are more conductive to exogenous HSCs. We characterize the intrinsic properties of HSCs in scid mice and compare those with Rag1 −/− HSCs.
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Qing, Y., Gerson, S. (2014). BM Hematopoietic Niche Occupancy Defect of HSC in Scid Mice. In: Poluektova, L., Garcia, J., Koyanagi, Y., Manz, M., Tager, A. (eds) Humanized Mice for HIV Research. Springer, New York, NY. https://doi.org/10.1007/978-1-4939-1655-9_7
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DOI: https://doi.org/10.1007/978-1-4939-1655-9_7
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