Abstract
Objectives
The present study evaluated the effect of an enamel matrix derivative (EMD) and platelet-rich fibrin (PRF)-modified porcine-derived collagen matrix (PDCM) on human umbilical vein endothelial cells (HUVEC) in vitro.
Materials and methods
PDCM (mucoderm®) was prepared to 6 mm (±0.1 mm) diameter discs. PDCM samples were incubated with either EMD, PRF, or control solutions for 100 min at 4 °C before the experiments. Cell-inducing properties of test materials on HUVEC cells were tested with cell proliferation assays (MTT, PrestoBlue®), a cytotoxicity assay (ToxiLight®), a Boyden chamber migration assay, and a cell attachment assay. Scanning electron microscopy (SEM) imaging was performed to determine the surface and the architecture of the modified matrices.
Results
Cell proliferation was elevated in the EMD and PRF groups compared with control (p each ≤0.046). PRF modification increased HUVEC migration ability by 8-fold compared with both control and EMD groups (p each <0.001). Both treatments significantly promoted the cell attachment of HUVEC to PDCM, as assessed by direct cell counts on the matrices (p each <0.001).
Conclusions
HUVEC cell characteristics were overall improved by EMD- and PRF- modified PDCM. Adsorbed bioactive molecules to the PDCM surface may have contributed to a more preferable environment to surrounding cells.
Clinical relevance
The results may give evidence that PDCM modification with EMD or PRF, respectively, might be a useful approach to improve clinical outcomes, to prevent inflammatory reactions and wound-healing disturbances, and to expand the clinical application area of PDCM.
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Acknowledgments
Special thanks to Kerstin Bahr for SEM imaging. This work contains substantial parts of the dissertation to DMD of Jung Soo Park. Free samples of the tested matrix were allocated free of charge from Botiss (Botiss Biomaterials, Berlin, Germany).
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Funding
No funding was received for this study. The work was supported by the Department of Operative Dentistry and Periodontology, University Medical Center, Augustusplatz 2, 55131 Mainz, Germany. Free samples of the tested matrix were allocated free of charge from Botiss (Botiss Biomaterials, Berlin, Germany).
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Electronic supplementary material
Suppl. 1
Automatic cell counting using ImageJ software. The original RGB image (a) is inverted and converted to gray-scale (8 bits) (b). “Image-based Tool for Counting Nuclei (ITCN)” command is then used to count cells. Counted particles are identified as red marks on the result picture (c). Sixteenfold magnified view of the area marked on Fig. 1c (d). (GIF 292 kb)
Suppl. 2
Microscopic images of SYTO® 11-stained HUVEC cells on PDCM samples. Cells were seeded on control, EMD, and PRF solution-pretreated PDCM samples. After 24 h, cells on matrices were stained with SYTO® Green, observed with an inverted microscope. Images were taken under 25-fold magnification from four different areas of each sample. Whereas cells are sparsely distributed on control sample (a), EMD- and PRF-treated PDCMs demonstrate an enormous amount of cells attached on the surface (b, d). In the PRF group, there were wide variations concerning the density of attached cells on the samples (c, d). Cell distributions were variable even within the same sample (c). a Control group; b EMD group; c, d PRF group. (GIF 412 kb)
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Park, J.S., Pabst, A.M., Ackermann, M. et al. Biofunctionalization of porcine-derived collagen matrix using enamel matrix derivative and platelet-rich fibrin: influence on mature endothelial cell characteristics in vitro. Clin Oral Invest 22, 909–917 (2018). https://doi.org/10.1007/s00784-017-2170-7
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DOI: https://doi.org/10.1007/s00784-017-2170-7