ABSTRACT
Objective To study the effect of carbonated drinks on primary and permanent teeth replacement in Chil-dren. Method Dog tooth enamel samples were soaked in coca-cola, sprite and pure soda, and the calcium, phosphorus lev-el were analysed. Dental papilla stem cells were separated and cultured in the conditioned medium by adding three drinks. PCR and western blot were used to detect mRNA and protein levels of activator of nuclear factor-k B receptor ligand (RANKL), osteoprotegerin (OPG) and vitamin D receptor (VDR) , then the possible role of each gene and interactions rela-tionship were analyzed. Results Compared with saline, coca-cola and sprite showed their significantly decalcification and dephosphorization role, while plain soda water showed calcium and phosphorus protective effect. These three drinks had no effect on mRNA and protein levels of RANKL gene (P>0.05). Coca-cola and sprite can reduce OPG mRNA and protein lev-els, and at the same time increase transcription and expression of the VDR gene. Plain soda water has no effect on the OPG gene manifestation, but can significantly reduce the transcription and translation level of the VDR gene. Conclusion Car-bonated drinks may affect the dental health of the children's primary and permanent teeth replacement by regulating bone re-lated gene expression and vitamin D receptor family.
ABSTRACT
Objective To study the functional roles of 1,25(OH)2D3 in osteogenic differentiation of the dental papilla stem cells. Methods The dental papilla stem cells were isolated and cultured in medium supplemented with different con-centrations of 1,25(OH)2D3 (1, 10 and 100 nmol/L). MTT assay was used to detect the cell growth, and flow cytometry was used to detect the cell cycle. Western blot assay was used to detect protein expression levels of receptor activator of nuclear factor-κB ligand (RANKL), osteoprotegerin (OPG) and vitamin D receptor (VDR). After siRNA silencing VDR expression, protein levels of RANKL and OPG were detected. Results MTT and flow cytometry results showed that there were no sig-nificant differences in the cell proliferation between different concentrations of 1,25(OH)2D3 (1, 10 and 100 nmol/L) and con-trol groups (P>0.05). Western blot results showed that there were protein expressions of VDR, RANKL and OPG in control group. The protein expressions of VDR, RANKL and OPG were increased after adding 1,25(OH)2D3, in which the upward trend was the most significant in VDR. After VDR expression was silenced by siRNA, the protein expression levels of VDR, RANKL and OPG were decreased. Conclusion 1,25(OH) 2D3 affects the osteoblast differentiation process of the dental pa-pilla stem cells by adjusting the VDR expression.