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Calcium Microcrystal Formation in Recurrent Herniation Patients After Autologous Disc Cell Transplantation

Abstract

Autologous disc cell transplantation (ADCT) is a cell-based therapy aiming to initiate regeneration of intervertebral disc (IVD) tissue, but little is known about potential risks. This study aims to investigate the presence of structural phenomena accompanying the transformation process after ADCT treatment in IVD disease. Structural phenomena of ADCT-treated patients (Group 1, n = 10) with recurrent disc herniation were compared to conventionally-treated patients with recurrent herniation (Group 2, n = 10) and patients with a first-time herniation (Group 3, n = 10). For ethical reasons, a control group of ADCT patients who did not have a recurrent disc herniation was not possible. Tissue samples were obtained via micro-sequestrectomy after disc herniation and analyzed by micro-computed tomography, scanning electron microscopy, energy dispersive spectroscopy, and histology in terms of calcification zones, tissue structure, cell density, cell morphology, and elemental composition. The major differentiator between sample groups was calcium microcrystal formation in all ADCT samples, not found in any of the control group samples, which may indicate disc degradation. The incorporation of mineral particles provided clear contrast between the different materials and chemical analysis of a single particle indicated the presence of magnesium-containing calcium phosphate. As IVD calcification is a primary indicator of disc degeneration, further investigation of ADCT and detailed investigations assessing each patient’s Pfirrmann degeneration grade following herniation is warranted. Structural phenomena unique to ADCT herniation prompt further investigation of the therapy’s mechanisms and its effect on IVD tissue. However, the impossibility of a perfect control group limits the generalizable interpretation of the results.

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Acknowledgements

The authors would like to thank U. Heunemann, Nico Teuscher, and A. Götz for technical assistance. We also thank Dr. Uwe Spohn and Andreas Cismak for scientific discussions and technical help. We extend special thanks to all the patients who participated in this study. The work presented in this paper was made possible by funding from the German Federal Ministry of Education and Research (BMBF, 1315883), the DAAD RISE internship program, and the Whitaker Biomedical Engineering Research Fellowship.

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Correspondence to S. Schwan.

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This work was supported by the German Federal Ministry of Education and Research (BMBF, PtJ-Bio, 0315883) and the DAAD RISE internship program, and the Whitaker Biomedical Engineering Research Fellowship.

Ethical review committee

The study was approved by the independent medical ethical committee as well as the scientific committee from the faculty of medicine Martin-Luther University Halle-Wittenberg and confirmed at 14 July 2010 under approval no. EK-MLU/14072010/hm-bü.

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Schwan, S., Ludtka, C., Friedmann, A. et al. Calcium Microcrystal Formation in Recurrent Herniation Patients After Autologous Disc Cell Transplantation. Tissue Eng Regen Med 14, 803–814 (2017). https://doi.org/10.1007/s13770-017-0076-8

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  • DOI: https://doi.org/10.1007/s13770-017-0076-8

Keywords

  • Recurrent disc herniation
  • Regenerative therapy
  • Disc calcification
  • Intervertebral disc