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01.05.2013 | Original Paper

Effect of parathyroid hormone-related protein in an in vitro hypertrophy model for mesenchymal stem cell chondrogenesis

verfasst von: Michael B. Mueller, Maria Fischer, Johannes Zellner, Arne Berner, Thomas Dienstknecht, Richard Kujat, Lukas Prantl, Michael Nerlich, Rocky S. Tuan, Peter Angele

Erschienen in: International Orthopaedics | Ausgabe 5/2013

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Abstract

Purpose

Mesenchymal stem cells (MSCs) express markers of hypertrophic chondrocytes during chondrogenic differentiation. We tested the suitability of parathyroid hormone-related protein (PTHrP), a regulator of chondrocyte hypertrophy in embryonic cartilage development, for the suppression of hypertrophy in an in vitro hypertrophy model of chondrifying MSCs.

Methods

Chondrogenesis was induced in human MSCs in pellet culture for two weeks and for an additional two weeks cultures were either maintained in standard chondrogenic medium or transferred to a hypertrophy-enhancing medium. PTHrP(1–40) was added to the medium throughout the culture period at concentrations from 1 to 1,000 pM. Pellets were harvested on days one, 14 and 28 for biochemical and histological analysis.

Results

Hypertrophic medium clearly enhanced the hypertrophic phenotype, with increased cell size, and strong alkaline phosphatase (ALP) and type X collagen staining. In chondrogenic medium, 1–100 pM PTHrP(1–40) did not inhibit chondrogenic differentiation, whereas 1,000 pM PTHrP(1–40) significantly reduced chondrogenesis. ALP activity was dose-dependently reduced by PTHrP(1–40) at 10–1,000 pM in chondrogenic conditions. Under hypertrophy-enhancing conditions, PTHrP(1–40) did not inhibit the induction of the hypertrophy. At the highest concentration (1,000 pM) in the hypertrophic group, aggregates were partially dedifferentiated and differentiated areas of these aggregates maintained their hypertrophic appearance.

Conclusions

PTHrP(1–40) treatment dose-dependently reduced ALP expression in MSC pellets cultured under standard chondrogenic conditions and is thus beneficial for the maintenance of the chondrogenic phenotype in this medium condition. When cultured under hypertrophy-enhancing conditions, PTHrP(1–40) could not diminish the induced enhancement of hypertrophy in the MSC pellets.

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Titel: Effect of parathyroid hormone-related protein in an in vitro hypertrophy model for mesenchymal stem cell chondrogenesis
verfasst von: Michael B. Mueller
Maria Fischer
Johannes Zellner
Arne Berner
Thomas Dienstknecht
Richard Kujat
Lukas Prantl
Michael Nerlich
Rocky S. Tuan
Peter Angele
Publikationsdatum: 01.05.2013
Verlag: Springer-Verlag
Erschienen in: International Orthopaedics / Ausgabe 5/2013
Print ISSN: 0341-2695
Elektronische ISSN: 1432-5195
DOI: https://doi.org/10.1007/s00264-013-1800-1

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Effect of parathyroid hormone-related protein in an in vitro hypertrophy model for mesenchymal stem cell chondrogenesis