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Stroma-derived connective tissue growth factor maintains cell cycle progression and repopulation activity of hematopoietic stem cells in vitro.
Stem Cell Rep. 5, 702-715 (2015)
Hematopoietic stem cells (HSCs) are preserved in co-cultures with UG26-1B6 stromal cells or their conditioned medium. We performed a genome-wide study of gene expression changes of UG26-1B6 stromal cells in contact with Lineage(-) SCA-1(+) KIT(+) (LSK) cells. This analysis identified connective tissue growth factor (CTGF) to be upregulated in response to LSK cells. We found that co-culture of HSCs on CTGF knockdown stroma (shCtgf) shows impaired engraftment and long-term quality. Further experiments demonstrated that CD34(-) CD48(-) CD150(+) LSK (CD34(-) SLAM) cell numbers from shCtgf co-cultures increase in G0 and senescence and show delayed time to first cell division. To understand this observation, a CTGF signaling network model was assembled, which was experimentally validated. In co-culture experiments of CD34(-) SLAM cells with shCtgf stromal cells, we found that SMAD2/3-dependent signaling was activated, with increasing p27(Kip1) expression and downregulating cyclin D1. Our data support the view that LSK cells modulate gene expression in the niche to maintain repopulating HSC activity.
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Publication type
Article: Journal article
Document type
Scientific Article
ISSN (print) / ISBN
2213-6711
Journal
Stem Cell Reports
Quellenangaben
Volume: 5,
Issue: 5,
Pages: 702-715
Publisher
Cell Press
Publishing Place
Maryland Heights, MO
Non-patent literature
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Reviewing status
Peer reviewed