Rapid and efficient homing of human CD34(+)CD38(-/low)CXCR4(+) stem and progenitor cells to the bone marrow and spleen of NOD/SCID and NOD/SCID/B2m(null) mice.

Blood
Orit KolletT Lapidot

Abstract

Stem cell homing into the bone microenvironment is the first step in the initiation of marrow-derived blood cells. It is reported that human severe combined immunodeficient (SCID) repopulating cells home and accumulate rapidly, within a few hours, in the bone marrow and spleen of immunodeficient mice previously conditioned with total body irradiation. Primitive CD34(+)CD38(-/low)CXCR4(+) cells capable of engrafting primary and secondary recipient mice selectively homed to the bone marrow and spleen, whereas CD34(-)CD38(-/low)Lin(-) cells were not detected. Moreover, whereas freshly isolated CD34(+)CD38(+/high) cells did not home, in vivo stimulation with granulocyte colony-stimulating factor as part of the mobilization process, or in vitro stem cell factor stimulation for 2 to 4 days, potentiated the homing capabilities of cytokine-stimulated CD34(+)CD38(+) cells. Homing of enriched human CD34(+) cells was inhibited by pretreatment with anti-CXCR4 antibodies. Moreover, primitive CD34(+)CD38(-/low)CXCR4(+) cells also homed in response to a gradient of human stromal cell-derived factor 1 (SDF-1), directly injected into the bone marrow or spleen of nonirradiated NOD/SCID mice. Homing was also inhibited by pretreatment of CD34(+) c...Continue Reading

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Citations

Aug 5, 2003·International Journal of Hematology·Fumiya HirayamaYoshihiko Tani
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