期刊
JOURNAL OF CELLULAR PHYSIOLOGY
卷 211, 期 2, 页码 386-391出版社
WILEY-LISS
DOI: 10.1002/jcp.20945
关键词
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资金
- NCRR NIH HHS [P20 RR 018757-02, P20 RR018757-035855, P20 RR018757] Funding Source: Medline
- NHLBI NIH HHS [P01-HL-56920] Funding Source: Medline
- NIDDK NIH HHS [K08DK6498-01, K08 DK064980-03, K08 DK064980-02, K08 DK064980-04, R01-DK-49650, P01-DK-5022, R01-DK2742, K08 DK064980-01] Funding Source: Medline
Stem cell homing has been studied in syngeneic models and appears to be rapid (< 1 h) and dependent on cellular adhesion and migration factors. We utilized a full H2-mismatched transplantation model to determine the basics of allogeneic homing. C57BL/6J Lin-Sca-1 + cells were labeled with CFSE and injected in non-myeloablated BALB/c mice. Fluorescent cell detection was via high-speed FACS analysis. Alternatively, B6.SJL whole bone marrow cells were injected in lethally irradiated BALB/c mice (10 Gy). One, 3,6, and 24 h after transplant, marrow was harvested and cells were either plated for high proliferative potential colony-forming cell (HPP-CFC) assay or secondarily injected into myeloablated (8 Gy) C57BL/6J mice using 10% competing C57BL/6J marrow. Chimerism was evaluated at 8 weeks. CFSE+ cells were detected in the bone marrow 1, 3, and 6 h after injection. The numbers were moderately lower when compared to syngeneic homing possibly due to strain effect. Conversely, utilizing a surrogate or secondary assay, we observed a decline of secondary engraftment of harvested cells over time, but not of HPP-CFC. Combining experiments and normalizing the 1-h time point to 100% (to allow comparison), we observed a mean relative engraftment of 87 +/- 29%, 72 +/- 21%, 84 +/- 35% of the 1 h level at 3, 6, and 24 h respectively. HPP-CFC assay showed no significant variation as a homing surrogate over 1-6 h. These data indicate a rapid homing into allogeneic recipients with a plateau at 1 h. The decline of secondary engraftability over time may indicate a phenotype alteration of homed cells.
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