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Blood, 15 November 2005, Vol. 106, No. 10, pp. 3646-3649.
Prepublished online as a Blood First Edition Paper on August 11, 2005; DOI 10.1182/blood-2004-12-4603.
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Submitted December 3, 2004
Accepted July 23, 2005
Donor origin of multipotent adult progenitor cells in radiation chimeras
Morayma Reyes, Sheng Li, Jessica Foraker, En Kimura, and Jeffrey S Chamberlain*
Department of Neurology, University of Washington School of Medicine, Seattle, WA, USA; Department of Pathology, University of Washington School of Medicine, Seattle, WA, USA
Department of Neurology, University of Washington School of Medicine, Seattle, WA, USA
Department of Neurology, University of Washington School of Medicine, Seattle, WA, USA; Department of Biochemistry and Department of Medicine, University of Washington School of Medicine, Seattle, WA, USA; Muscular Dystrophy Cooperative Research Center, University of Washington School of Medicine, Seattle, WA, USA
* Corresponding author; email: jsc5{at}u.washington.edu.
Multipotent Adult Progenitor Cells (MAPC) are bone marrow derived stem cells that have extensive in vitro expansion capacity and can differentiate in vivo and in vitro into tissue cells of all three germinal layers: ectoderm, mesoderm, endoderm. The origin of MAPC within bone marrow is unknown. MAPC are believed to be derived from the bone marrow stroma compartment as they are isolated within the adherent cell component. Numerous studies of bone marrow chimeras in human and mouse point to a host origin of bone marrow stromal cells. Mesenchymal stem cells (MSC), which coexist with stromal cells, have also been proven to be of host origin post-allogeneic bone marrow transplantation in numerous studies. We report here that following syngeneic bone marrow transplants into lethally irradiated C57BL6 mice, MAPC are of donor origin.

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