Affiliation:
1. Conservative Dentistry and Periodontology Department Christian Albrechts University Kiel Germany
2. Oral Medicine and Periodontology Department, Faculty of Dentistry Cairo University Cairo Egypt
3. Stem Cells and Tissue Engineering Unit, Faculty of Dentistry Cairo University Cairo Egypt
Abstract
AbstractBackgroundStem/progenitor cells from human exfoliated deciduous teeth (SHED) show remarkable pluripotent, regenerative, and immunological capacities. During in vivo regenerative processes, there could be the presence of SHED in the surrounding inflammatory microenvironment, through toll‐like receptors (TLRs).AimThe aim of this paper was to present a characteristic TLR expression profile on SHED for the first time.DesignCells were harvested from extracted primary teeth (n = 10), anti‐STRO‐1 immunomagnetically sorted and cultivated, through colony‐forming units (CFUs). SHED were examined for mesenchymal stem/progenitor cell traits, including the expression of clusters of differentiation (CDs) 14, 34, 45, 73, 90, 105, and 146, and their multilineage differentiation aptitude. TLRs 1–10 expression was investigated for SHED in uninflamed and inflamed (25 ng/mL IL‐1β, 103 U/mL IFN‐γ, 50 ng/mL TNF‐α, and 3 × 103 U/mL IFN‐α; SHED‐i) microenvironmental conditions.ResultsSHED were negative for CDs 14, 34, and 45, but were positive for CDs 73, 90, 105, and 146, and demonstrated characteristic multilineage differentiation. In an uninflamed microenvironment, SHED expressed TLRs 1, 2, 3, 4, 6, 8, 9, and 10. The inflammatory microenvironment downregulated TLR7 significantly on gene level and upregulated TLR8 on gene and protein levels (p < .05; Wilcoxon signed‐rank test).ConclusionThere appears to be a unique TLR expression profile on SHED, which could modulate their immunological and regenerative abilities in oral tissue engineering approaches.