期刊
BONE MARROW TRANSPLANTATION
卷 42, 期 9, 页码 581-588出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/bmt.2008.222
关键词
G-CSF-induced HSPC mobilization; metalloproteinases; chemotactic activity; proteolytic degradation; osteoblast; poor mobilizer
资金
- Science and Technology Development Program of Tianjin [06YFSYSF01900]
- Natural Sciences Foundation of Tianjin [06YFJMSC08500, 08JCYBJ6200]
- Scientific Research Foundation of the State Human Resource Ministry for Returned Chinese Scholars, China
The major involvement of chemokines and proteolytic enzymes has recently been discovered in the mobilization process. Here, we report that the degradation of BM stromal cell-derived factor (SDF-1) by matrix metalloproteinase (MMP)-9 is important in G-CSF-mediated hematopoietic stem/progenitor cells (HSPCs) mobilization. In this study, the SDF-1 concentration in healthy donors BM plasma decreased significantly after 5 days of G-CSF administration, with no obvious change of SDF-1 in the peripheral blood. We also observed a similar result by immunohistochemical staining on the BM biopsy slides. In vitro, mobilized BM plasma exhibited decreased chemotactic effect on CD34(+) cells, compared with steady-state BM plasma. MMP-9 protein and mRNA increased dramatically in the BM plasma in accordance with SDF-1 decrease. MMP-9 enriched supernatant from HT1080 cell-conditioned medium upregulated CXCR4 expression and the migration of BM CD34(+) cells toward SDF-1. SDF-1 was a substrate for MMP-9, furthermore, SDF-1 also stimulated MMP-9 proteolytic enzyme activity of BM CD34(+) cells, which facilitate HSPCs migration. In BALB/c mice, HSPCs mobilization was significantly inhibited by anti-SDF-1 antibodies or MMP inhibitor, o-phenanthroline. In conclusion, the degradation of BM SDF-1 by MMP-9 is a vital step in mobilization.
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