Regulation of WNT5A and WNT11 during MSC in vitro chondrogenesis

• Verfasst von: Diederichs, Solvig [VerfasserIn]
• Verfasst von: Tonnier, Veronika [VerfasserIn]
• Verfasst von: Dreher, Simon I. [VerfasserIn]
• Verfasst von: Geisbüsch, Andreas [VerfasserIn]
• Verfasst von: Richter, Wiltrud [VerfasserIn]
• Titel: Regulation of WNT5A and WNT11 during MSC in vitro chondrogenesis
• Titelzusatz: WNT inhibition lowers BMP and hedgehog activity, and reduces hypertrophy
• Verf.angabe: Solvig Diederichs, Veronika Tonnier, Melanie März, Simon I. Dreher, Andreas Geisbüsch, Wiltrud Richter
• E-Jahr: 2019
• Jahr: 12 April 2019
• Umfang: 15 S.
• Fussnoten: Gesehen am 11.10.2019
• Titel Quelle: Enthalten in: Cellular and molecular life sciences
• Ort Quelle: Cham (ZG) : Springer International Publishing AG, 1997
• Jahr Quelle: 2019
• Band/Heft Quelle: 76(2019), 19, Seite 3875-3889
• ISSN Quelle: 1420-9071
• DOI: doi:10.1007/s00018-019-03099-0
• Datenträger: Online-Ressource
• Sprache: eng
• Sach-SW: Bone
• Sach-SW: Cartilage
• Sach-SW: Chondrogenesis
• Sach-SW: Hypertrophy
• Sach-SW: Mesenchymal stromal cells
• Sach-SW: WNT
• K10plus-PPN: 1678731943

Abstract

Re-directing mesenchymal stromal cell (MSC) chondrogenesis towards a non-hypertrophic articular chondrocyte-(AC)-like phenotype is important for improving articular cartilage neogenesis to enhance clinical cartilage repair strategies. This study is the first to demonstrate that high levels of non-canonical WNT5A followed by WNT11 and LEF1 discriminated MSC chondrogenesis from AC re-differentiation. Moreover, β-catenin seemed incompletely silenced in differentiating MSCs, which altogether suggested a role for WNT signaling in hypertrophic MSC differentiation. WNT inhibition with the small molecule IWP-2 supported MSC chondrogenesis according to elevated proteoglycan deposition and reduced the characteristic upregulation of BMP4, BMP7 and their target ID1, as well as IHH and its target GLI1 observed during endochondral differentiation. Along with the pro-hypertrophic transcription factor MEF2C, multiple hypertrophic downstream targets including IBSP and alkaline phosphatase activity were reduced by IWP-2, demonstrating that WNT activity drives BMP and hedgehog upregulation, and MSC hypertrophy. WNT inhibition almost matched the strong anti-hypertrophic capacity of pulsed parathyroid hormone-related protein application, and both outperformed suppression of BMP signaling with dorsomorphin, which also reduced cartilage matrix deposition. Yet, hypertrophic marker expression under IWP-2 remained above AC level, and in vivo mineralization and ectopic bone formation were reduced but not eliminated. Overall, the strong anti-hypertrophic effects of IWP-2 involved inhibition but not silencing of pro-hypertrophic BMP and IHH pathways, and more advanced silencing of WNT activity as well as combined application of IHH or BMP antagonists should next be considered to install articular cartilage neogenesis from human MSCs.