Abstract
Purpose
Mesenchymal progenitor cells (MPCs) are capable of differentiating into osteo/chondrogenic cells to contribute substantially to heterotopic ossification (HO). This study aimed to examine the impact of hypoxia on MPCs in the aetiology of HO.
Methods
MPCs from human normal and HO skeletal tissue were cultivated under normoxia and hypoxia. Gene expression of factors which have a key role in HO aetiology (BMPs, COX-1 and COX-2, etc.) were examined by real-time PCR. Tissue of both groups was analysed by immunohistochemistry.
Results
Under hypoxia, COX-1, -2 and SOX-9 gene expression was elevated in HO MPCs, whereas in normal muscle tissue only COX-2 was upregulated. MPCs from HO had a significantly elevated gene expression of BMP-4 and decreased expression of BMP-1 and HIF-1 under hypoxia compared to normal MPCs. Immunohistochemistry detected no significant differences between normal and HO tissue.
Conclusions
Hypoxia causes an enhanced gene expression of factors, which have a key role in HO pathophysiology. A better understanding of this entity will possibly allow reducing HO rates in orthopaedic and trauma surgery.
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Acknowledgments
The authors would like to thank Mr. Matthias Munding and Mrs. Nicole Richter for their excellent technical assistance and contribution to this study
Funding
This study was funded by the Medical Faculty of the University of Regensburg (ReFormA).
Conflict of interest
The authors declare that they have no competing interests.
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Winkler, S., Niedermair, T., Füchtmeier, B. et al. The impact of hypoxia on mesenchymal progenitor cells of human skeletal tissue in the pathogenesis of heterotopic ossification. International Orthopaedics (SICOT) 39, 2495–2501 (2015). https://doi.org/10.1007/s00264-015-2995-0
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DOI: https://doi.org/10.1007/s00264-015-2995-0