The role of extracellular matrix expression, ERK1/2 signaling and cell cohesiveness for cartilage yield from iPSCs
Current therapies involving chondrocytes or mesenchymal stromal cells (MSCs) remain inefficient in restoring cartilage properties upon injury. The induced pluripotent stem-cell (iPSC)-derived mesenchymal progenitor cells (iMPCs) have been put forward as a promising alternative cell source due to the...
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| Hauptverfasser: | , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
2 September 2019
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| In: |
International journal of molecular sciences
Year: 2019, Jahrgang: 20, Heft: 17 |
| ISSN: | 1422-0067 |
| DOI: | 10.3390/ijms20174295 |
| Online-Zugang: | Verlag, kostenfrei, Volltext: https://doi.org/10.3390/ijms20174295 Verlag, kostenfrei, Volltext: https://www.mdpi.com/1422-0067/20/17/4295 
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| Verfasserangaben: | Justyna Buchert, Solvig Diederichs, Ursula Kreuser, Christian Merle and Wiltrud Richter |
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| 245 | 1 | 4 | |a The role of extracellular matrix expression, ERK1/2 signaling and cell cohesiveness for cartilage yield from iPSCs |c Justyna Buchert, Solvig Diederichs, Ursula Kreuser, Christian Merle and Wiltrud Richter |
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| 520 | |a Current therapies involving chondrocytes or mesenchymal stromal cells (MSCs) remain inefficient in restoring cartilage properties upon injury. The induced pluripotent stem-cell (iPSC)-derived mesenchymal progenitor cells (iMPCs) have been put forward as a promising alternative cell source due to their high proliferation and differentiation potential. However, the observed cell loss during in vitro chondrogenesis is currently a bottleneck in establishing articular chondrocyte generation from iPSCs. In a search for candidate mechanisms underlying the low iPSC-derived cartilage tissue yield, global transcriptomes were compared between iMPCs and MSCs and the cell properties were analyzed via a condensation assay. The iMPCs had a more juvenile mesenchymal gene signature than MSCs with less myofibroblast-like characteristics, including significantly lower ECM- and integrin-ligand-related as well as lower α-smooth-muscle-actin expression. This correlated with less substrate and more cell-cell adhesion, impaired aggregate formation and consequently inferior cohesive tissue properties of the iMPC-pellets. Along lower expression of pro-survival ECM molecules, like decorin, collagen VI, lumican and laminin, the iMPC populations had significantly less active ERK1/2 compared to MSCs. Overall, this study proposes that this ECM and integrin-ligand shortage, together with insufficient pro-survival ERK1/2-activity, explains the loss of a non-aggregating iMPC sub-fraction during pellet formation and reduced survival of cells in early pellets. Enhancing ECM production and related signaling in iMPCs may be a promising new means to enrich the instructive microenvironment with pro-survival cues allowing to improve the final cartilage tissue yield from iPSCs. | ||
| 650 | 4 | |a cartilage regeneration | |
| 650 | 4 | |a ERK1/2 signaling | |
| 650 | 4 | |a extracellular matrix | |
| 650 | 4 | |a induced pluripotent stem cells | |
| 650 | 4 | |a mesenchymal stromal cells | |
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