TGF-BETA signaling in stromal cells acts upstream of FGF-10 to regulate epithelial stem cell growth in the adult lung.
Details
Publication Year 2013-08,Volume 11,Issue #3,Page 1222-1233
Journal Title
Stem Cell Research
Publication Type
Journal Article
Abstract
Tissue resident mesenchymal stromal cells (MSCs) contribute to tissue regeneration through various mechanisms, including the secretion of trophic factors that act directly on epithelial stem cells to promote epithelialization. However, MSCs in tissues constitute a heterogeneous population of stromal cells and different subtypes may have different functions. In this study we show that CD166(neg) and CD166(pos) lung stromal cells have different proliferative and differentiative potential. CD166(neg) lung stromal cells exhibit high proliferative potential with the capacity to differentiate along the lipofibroblastic and myofibroblastic lineages, whereas CD166(pos) lung stromal cells have limited proliferative potential and are committed to the myofibroblastic lineage. Moreover, we show that CD166(pos) lung stromal cells do not share the same epithelial-supportive capacity as their CD166(neg) counterparts, which support the growth of lung epithelial stem cell (EpiSPC) colonies in vitro. In addition, ex vivo expansion of lung stromal cells also resulted in the loss of epithelial-supportive capacity, which could be reinstated by inhibition of the TGF-β signaling pathway. We show that epithelial-supportive capacity correlated with the level of FGF-10 expression and the reactivation of several lung development-associated genes. In summary, these studies suggest that TGF-β signaling in stromal cells acts upstream of FGF-10 to regulate epithelial stem cell growth in the adult lung.
Publisher
Elsevier
Keywords
CFU-Epi, CFU-F, EpiSPC, MSC, colony-forming unit-epithelial, colony-forming unit-fibroblast, epithelial stem/progenitor cell, mesenchymal stromal cell
Research Division(s)
Cell Signalling And Cell Death; Stem Cells And Cancer
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Copyright © 2013 Elsevier B.V. All rights reserved.


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