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        Flow Cytometry Measurement of Bone Marrow Perfusion in the Mouse and Sorting of Progenitors and Stems Cells According to Position Relative to Blood Fl

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        Identification of the precise location, where hematopoietic stem cells (HSCs) reside in the bone marrow, has made a great leap forward with the advance of live time-lapse video 2-photon fluorescent microscopy. These studies have shown that HSCs preferentially resides in the endosteal region of the BM, at an average of two cell diameters from osteoblasts covering endosteal bone surfaces. However, this equipment is very sophisticated and only a very few laboratories can perform these studies. To investigate functional attributes of these niches, we have developed a flow cytometry technique in which mice are perfused with the cell-permeable fluorescent dye Hoechst33342 in vivo before bone marrow cells are collected and antibody stained. This method enables to position phenotypic HSC, multipotent and myeloid progenitors, as well as BM nonhematopoietic stromal cells relative to blood flow in vivo. This technique enables prospective isolation of HSCs based on the in vivo perfusion of the niches in which they reside.
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