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Published in: Endocrine 1/2022

01-01-2022 | Fracture Healing | Original Article

A novel in vitro assay to study chondrocyte-to-osteoblast transdifferentiation

Authors: Miriam E. A. Tschaffon, Stefan O. Reber, Astrid Schoppa, Sayantan Nandi, Ion C. Cirstea, Attila Aszodi, Anita Ignatius, Melanie Haffner-Luntzer

Published in: Endocrine | Issue 1/2022

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Abstract

Purpose

Endochondral ossification, which involves transdifferentiation of chondrocytes into osteoblasts, is an important process involved in the development and postnatal growth of most vertebrate bones as well as in bone fracture healing. To study the basic molecular mechanisms of this process, a robust and easy-to-use in vitro model is desirable. Therefore, we aimed to develop a standardized in vitro assay for the transdifferentiation of chondrogenic cells towards the osteogenic lineage.

Methods

Murine chondrogenic ATDC5 cells were differentiated into the chondrogenic lineage for seven days and subsequently differentiated towards the osteogenic direction. Gene expression analysis of pluripotency, as well as chondrogenic and osteogenic markers, cell–matrix staining, and immunofluorescent staining, were performed to assess the differentiation. In addition, the effects of Wnt3a and lipopolysaccharides (LPS) on the transdifferentiation were tested by their addition to the osteogenic differentiation medium.

Results

Following osteogenic differentiation, chondrogenically pe-differentiated cells displayed the expression of pluripotency and osteogenic marker genes as well as alkaline phosphatase activity and a mineralized matrix. Co-expression of Col2a1 and Col1a1 after one day of osteogenic differentiation indicated that osteogenic cells had differentiated from chondrogenic cells. Wnt3a increased and LPS decreased transdifferentiation towards the osteogenic lineage.

Conclusion

We successfully established a rapid, standardized in vitro assay for the transdifferentiation of chondrogenic cells into osteogenic cells, which is suitable for testing the effects of different compounds on this cellular process.
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Metadata
Title
A novel in vitro assay to study chondrocyte-to-osteoblast transdifferentiation
Authors
Miriam E. A. Tschaffon
Stefan O. Reber
Astrid Schoppa
Sayantan Nandi
Ion C. Cirstea
Attila Aszodi
Anita Ignatius
Melanie Haffner-Luntzer
Publication date
01-01-2022
Publisher
Springer US
Published in
Endocrine / Issue 1/2022
Print ISSN: 1355-008X
Electronic ISSN: 1559-0100
DOI
https://doi.org/10.1007/s12020-021-02853-4

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