Objective: To better understand homing potentiality of hematopoietic stem cells (HSC) in human umbilial cord blood (UCB) and the mechanism of dextran sulfate (DS) mobilization. Methods: Sub lethally irradiated or DS pretreated severe combined immunodeficient (SCID) mice were transplanted with UCB, which was cryopreserved at -80℃.Human cells in recipient mice were detected by flow cytometry and CFU GM assay from each host organ. Results: In contrast with the controls, engraftment after irradiation or administration of DS resulted in a higher percentage of CD45 +,CD34 +,CD19 + cells produced in SCID mice. While comparison between the experimental groups, higher implantation level was obtained in the former if equivalent donor cells were used in both groups. Conclusion:DS is a safe and effective pretreatment, which can mobilize HSC, but also vocate niches for transplanted HSC homing. [
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