title: Pattern of localization of primitive hematopoietic cells in vivo using a novel mouse model.
abstract: Bone marrow transplantation is increasingly used as a treatment for numerous immunologic, hematologic, and malignant disorders. However, the mechanism by which transplanted hematopoietic stem cells are engrafted is not completely understood. Many traditional techniques have been used to study the engraftment of transplanted stem cells. Most of these methods are ex vivo and, in some cases, donor cells must be modified to enable detection. We describe a novel alternative for identifying unmodified primitive donor cells in a murine host. This mouse model is based on the differential capacity of adenine phosphoribosyltransferase (APRT)-positive and APRT-negative cells to sequester and incorporate radiolabeled adenine. Aprt is the gene encoding the adenine phosphoribosyltransferase purine salvage enzyme and has been ablated in 129sv mice. Following the injection of APRT-positive c-kit-positive enriched hematopoietic cells into syngeneic, sublethally irradiated APRT-deficient mice, engrafted cells and their presumptive progeny were successfully tracked by polymerase chain reaction. Their presence also was visualized by autoradiography of paraffin-embedded tissue sections. APRT-positive c-kit-positive enriched cells were detected in the bone marrow, spleen, lung, and thymus of nonirradiated mice. Donor cells and their progeny were more widely distributed in tissues of sublethally irradiated mice than of their nonirradiated counterparts, demonstrating that the pattern of localization of c-kit-positive enriched cells differs between nonirradiated and sublethally irradiated syngeneic recipients. The Aprt mouse model provides a sensitive method for further studying the mechanism of engraftment of unmodified donor hematopoietic cells in relation to the tissue architecture of the recipient.
authors.affiliation: Department of Cell Biology, Neurobiology and Anatomy, University of Cincinnati, OH 45267, USA. Rachel.Bolante@uc.edu
authors.forename: R
authors.initials: R
authors.lastname: Bolante-Cervantes
authors.forename: S
authors.initials: S
authors.lastname: Li
authors.forename: A
authors.initials: A
authors.lastname: Sahota
authors.forename: J A
authors.initials: JA
authors.lastname: Tischfield
authors.forename: T
authors.initials: T
authors.lastname: Zwerdling
authors.forename: P J
authors.initials: PJ
authors.lastname: Stambrook
mesh_terms: D000225:Adenine / Q000493:pharmacokinetics*; D000228:Adenine Phosphoribosyltransferase / Q000235:genetics / Q000378:metabolism*; D000818:Animals; D001345:Autoradiography; D002250:Carbon Radioisotopes / Q000493:pharmacokinetics*; D002470:Cell Survival; D006085:Graft Survival; D018380:Hematopoietic Stem Cell Transplantation; D006412:Hematopoietic Stem Cells / Q000000981:diagnostic imaging* / Q000201:enzymology; D007275:Injections, Intravenous; D008221:Lymphoid Tissue / Q000473:pathology; D008657:Metabolic Clearance Rate; D051379:Mice; D018345:Mice, Knockout; D016612:Paraffin Embedding; D016133:Polymerase Chain Reaction; D019009:Proto-Oncogene Proteins c-kit / Q000032:analysis; D011828:Radiation Chimera; D011833:Radiation Injuries, Experimental / Q000473:pathology; D011877:Radionuclide Imaging; D012680:Sensitivity and Specificity; D014018:Tissue Distribution
chemical_list: D002250:Carbon Radioisotopes; D000228:Adenine Phosphoribosyltransferase; D019009:Proto-Oncogene Proteins c-kit; D000225:Adenine