title: Retention and multilineage expression of human hematopoietic stem cells in human-sheep chimeras.
abstract: We have taken advantage of the permissive environment of the preimmune fetus to achieve engraftment of hematopoietic stem cells (HSC) from fetal and postnatal human sources in sheep. The resulting chimeric lambs exhibited long-term multilineage (erythroid, myeloid, lymphoid) expression of donor cells that remained responsive to human-specific cytokines. The small size of the fetus allowed the assessment of the engraftment potential of relatively small numbers of highly characterized human HSC populations, while the large size of the chimeric sheep permitted the long-term evaluation of the HSC activity and response in vivo. The human/sheep xenograft may offer a useful large animal model for the assay and long-term study of the human HSC subsets.
authors.affiliation: Department of Veterans Affairs Medical Center, University of Nevada School of Medicine, Reno 89511, USA.
authors.forename: E D
authors.initials: ED
authors.lastname: Zanjani
authors.forename: M R
authors.initials: MR
authors.lastname: Silva
authors.forename: A W
authors.initials: AW
authors.lastname: Flake
mesh_terms: D000818:Animals; D001773:Blood Cells / Q000637:transplantation; D016026:Bone Marrow Transplantation; D002454:Cell Differentiation; D002678:Chimera / Q000502:physiology*; D005312:Fetal Blood / Q000166:cytology; D016332:Fetal Tissue Transplantation; D005865:Gestational Age; D006085:Graft Survival; D006086:Graft vs Host Disease / Q000209:etiology; D006410:Hematopoiesis / Q000187:drug effects; D016298:Hematopoietic Cell Growth Factors / Q000494:pharmacology; D018380:Hematopoietic Stem Cell Transplantation / Q000009:adverse effects; D006801:Humans; D007274:Injections, Intraperitoneal; D008099:Liver / Q000196:embryology; D012756:Sheep / Q000196:embryology / Q000502:physiology*; D014183:Transplantation, Heterologous
chemical_list: D016298:Hematopoietic Cell Growth Factors