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Unger RE, Stojanovic S, Besch L, Alkildani S, Schröder R, Jung O, Bogram C, Görke O, Najman S, Tremel W, Barbeck M. In Vivo Biocompatibility Investigation of an Injectable Calcium Carbonate (Vaterite) as a Bone Substitute including Compositional Analysis via SEM-EDX Technology. Int J Mol Sci 2022; 23:ijms23031196. [PMID: 35163120 PMCID: PMC8835873 DOI: 10.3390/ijms23031196] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2022] [Revised: 01/18/2022] [Accepted: 01/19/2022] [Indexed: 12/30/2022] Open
Abstract
Injectable bone substitutes (IBS) are increasingly being used in the fields of orthopedics and maxillofacial/oral surgery. The rheological properties of IBS allow for proper and less invasive filling of bony defects. Vaterite is the most unstable crystalline polymorph of calcium carbonate and is known to be able to transform into hydroxyapatite upon contact with an organic fluid (e.g., interstitial body fluid). Two different concentrations of hydrogels based on poly(ethylene glycol)-acetal-dimethacrylat (PEG-a-DMA), i.e., 8% (w/v) (VH-A) or 10% (w/v) (VH-B), were combined with vaterite nanoparticles and implanted in subcutaneous pockets of BALB/c mice for 15 and 30 days. Explants were prepared for histochemical staining and immunohistochemical detection methods to determine macrophage polarization, and energy-dispersive X-ray analysis (EDX) to analyze elemental composition was used for the analysis. The histopathological analysis revealed a comparable moderate tissue reaction to the hydrogels mainly involving macrophages. Moreover, the hydrogels underwent a slow cellular infiltration, revealing a different degradation behavior compared to other IBS. The immunohistochemical detection showed that M1 macrophages were mainly found at the material surfaces being involved in the cell-mediated degradation and tissue integration, while M2 macrophages were predominantly found within the reactive connective tissue. Furthermore, the histomorphometrical analysis revealed balanced numbers of pro- and anti-inflammatory macrophages, demonstrating that both hydrogels are favorable materials for bone tissue regeneration. Finally, the EDX analysis showed a stepwise transformation of the vaterite particle into hydroxyapatite. Overall, the results of the present study demonstrate that hydrogels including nano-vaterite particles are biocompatible and suitable for bone tissue regeneration applications.
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Affiliation(s)
- Ronald E. Unger
- Repair-Lab, Institute of Pathology, University Medical Center of the Johannes Gutenberg University, 55131 Mainz, Germany;
| | - Sanja Stojanovic
- Department of Biology and Human Genetics, Faculty of Medicine, University of Niš, 18108 Niš, Serbia; (S.S.); (S.N.)
- Scientific Research Center for Biomedicine, Department for Cell and Tissue Engineering, Faculty of Medicine, University of Niš, 18108 Niš, Serbia
| | - Laura Besch
- Institute of Inorganic Chemistry and Analytical Chemistry, Johannes Gutenberg-University of Mainz, 55128 Mainz, Germany; (L.B.); (R.S.); (W.T.)
| | - Said Alkildani
- BerlinAnalytix GmbH, Ullsteinstrasse 108, 12109 Berlin, Germany; (S.A.); (C.B.)
- Clinic and Policlinic for Dermatology and Venereology, University Medical Center Rostock, 18057 Rostock, Germany;
| | - Romina Schröder
- Institute of Inorganic Chemistry and Analytical Chemistry, Johannes Gutenberg-University of Mainz, 55128 Mainz, Germany; (L.B.); (R.S.); (W.T.)
| | - Ole Jung
- Clinic and Policlinic for Dermatology and Venereology, University Medical Center Rostock, 18057 Rostock, Germany;
| | - Caroline Bogram
- BerlinAnalytix GmbH, Ullsteinstrasse 108, 12109 Berlin, Germany; (S.A.); (C.B.)
| | - Oliver Görke
- Institute of Materials Science and Technology, Chair of Advanced Ceramic Materials, Technical University Berlin, Hardenbergstr. 40, 10623 Berlin, Germany;
| | - Stevo Najman
- Department of Biology and Human Genetics, Faculty of Medicine, University of Niš, 18108 Niš, Serbia; (S.S.); (S.N.)
- Scientific Research Center for Biomedicine, Department for Cell and Tissue Engineering, Faculty of Medicine, University of Niš, 18108 Niš, Serbia
| | - Wolfgang Tremel
- Institute of Inorganic Chemistry and Analytical Chemistry, Johannes Gutenberg-University of Mainz, 55128 Mainz, Germany; (L.B.); (R.S.); (W.T.)
| | - Mike Barbeck
- Institute of Materials Science and Technology, Chair of Advanced Ceramic Materials, Technical University Berlin, Hardenbergstr. 40, 10623 Berlin, Germany;
- Correspondence: ; Tel.: +49-176-81022467
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