PDGF, TGF-β, and FGF signaling is important for differentiation and growth of mesenchymal stem cells (MSCs): transcriptional profiling can identify markers and signaling pathways important in differentiation of MSCs into adipogenic, chondrogenic, and osteogenic lineages

Blood - Tập 112 - Trang 295-307 - 2008
Felicia Ng1, Shayne Boucher2, Susie Koh1, Konduru S.R. Sastry1, Lucas Chase2, Uma Lakshmipathy2, Cleo Choong3, Zheng Yang4, Mohan C. Vemuri2, Mahendra S. Rao2, Vivek Tanavde1
1Genome and Gene Expression Analysis Group, Bioinformatics Institute, Agency for Science Technology and Research (A*STAR), Singapore
2Stem Cells and Regenerative Medicine, Invitrogen Corporation, Carlsbad CA
3Laboratory of Stem Cell Biology, Singapore Stem Cell Consortium, Singapore
4Department of Orthopaedic Surgery, Yong Loo Lin School of Medicine, Tissue Engineering Program, National University of Singapore, Singapore

Tóm tắt

Abstract We compared the transcriptomes of marrow-derived mesenchymal stem cells (MSCs) with differentiated adipocytes, osteocytes, and chondrocytes derived from these MSCs. Using global gene-expression profiling arrays to detect RNA transcripts, we have identified markers that are specific for MSCs and their differentiated progeny. Further, we have also identified pathways that MSCs use to differentiate into adipogenic, chondrogenic, and osteogenic lineages. We identified activin-mediated transforming growth factor (TGF)–β signaling, platelet-derived growth factor (PDGF) signaling and fibroblast growth factor (FGF) signaling as the key pathways involved in MSC differentiation. The differentiation of MSCs into these lineages is affected when these pathways are perturbed by inhibitors of cell surface receptor function. Since growth and differentiation are tightly linked processes, we also examined the importance of these 3 pathways in MSC growth. These 3 pathways were necessary and sufficient for MSC growth. Inhibiting any of these pathways slowed MSC growth, whereas a combination of TGF-β, PDGF, and β-FGF was sufficient to grow MSCs in a serum-free medium up to 5 passages. Thus, this study illustrates it is possible to predict signaling pathways active in cellular differentiation and growth using microarray data and experimentally verify these predictions.

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