ABSTRACT
BACKGROUND: miR-1226 has been reported to be dysregulated in periodontitis, implying its potential functional role, which needs to be validated. The purpose of this study was to assess the clinical significance of miR-1226 in periodontitis. METHODS: Gingival crevicular fluid samples were collected from 50 healthy volunteers and 72 periodontitis patients. The expression of miR-1226 in collected samples was detected by RT-qPCR. The concentrations of pro-inflammatory cytokines were analyzed by ELISA. The relationship of miR-1226 expression level with patients' characteristics was evaluated by the χ2 test and the Pearson correlation test. RESULTS: It was found that miR-1226 was downregulated in the gingival crevicular fluid of periodontitis patients compared with healthy volunteers. The downregulation of miR-1226 was negatively correlated with the pocket depth, attachment loss, plaque index, bleeding index, and MMP-8 concentration of patients. miR-1226 showed high sensitivity and specificity to discriminate periodontitis patients from healthy volunteers. Additionally, periodontitis patients had a relatively high concentration of pro-inflammatory cytokines, which is correlated with miR-1226 expression negatively. CONCLUSIONS: miR-1226 could be an indicator for the diagnosis of periodontitis and has the potential to predict the development and severity of periodontitis.
Subject(s)
Chronic Periodontitis , MicroRNAs , Chronic Periodontitis/genetics , Gingival Crevicular Fluid , Humans , MicroRNAs/genetics , Periodontal Attachment Loss , Periodontal IndexABSTRACT
Periodontitis is one of the most common chronic inflammations of the oral cavity, which eventually leads to tooth loss. Betulinic acid (BetA) is an organic acid that has anti-inflammatory effects and is derived from fruits and plants, but its effect on the osteogenic differentiation of human periodontal ligament stem cells (hPDLSCs) is still unclear. This study aimed to explore the effect of BetA on the osteogenic differentiation of hPDLSCs and its mechanism. Our results revealed that BetA not only promoted the viability of hPDLSCs but also induced their osteogenic differentiation in a dose-dependent manner. In addition, RNA sequencing was used to screen the differentially expressed genes (DEGs) after hPDLSCs were treated with BetA, and 127 upregulated and 138 downregulated genes were identified. Gene Ontology enrichment analysis showed that DEGs were mainly involved in the response to lithium ions and the positive regulation of macrophage-derived foam cell differentiation. The Kyoto Encyclopedia of Genes and Genomes analysis results revealed that DEGs were enriched in the nuclear factor-κB and interleukin-17 signaling pathways. More importantly, we confirmed that early growth response gene 1 (EGR1), one of the three DEGs involved in bone formation, significantly promoted the expression of osteogenic markers and the mineralization of hPDLSCs. Knockdown of EGR1 obviously limited the effect of BetA on the osteogenic differentiation of hPDLSCs. In conclusion, BetA promoted the osteogenic differentiation of hPDLSCs through upregulating EGR1, and BetA might be a promising candidate in the clinical application of periodontal tissue regeneration.
Subject(s)
Cell Differentiation/drug effects , Early Growth Response Protein 1/metabolism , Osteogenesis/drug effects , Pentacyclic Triterpenes/pharmacology , Periodontal Ligament/drug effects , Periodontal Ligament/metabolism , Stem Cells/metabolism , Adult , Cell Survival/drug effects , Cells, Cultured , Early Growth Response Protein 1/genetics , Early Growth Response Protein 2/genetics , Early Growth Response Protein 2/metabolism , Gene Expression Regulation/drug effects , Humans , Periodontal Ligament/cytology , Proto-Oncogene Proteins c-fos/genetics , Proto-Oncogene Proteins c-fos/metabolism , Signal Transduction/drug effects , Stem Cells/cytology , Stem Cells/drug effects , Up-Regulation/drug effects , Young Adult , Betulinic AcidABSTRACT
PURPOSE: This study aimed to investigate the role of chemokine receptor 2 (CXCR2) gene polymorphisms in peri-implantitis susceptibility in a Chinese Han population. PATIENTS AND METHODS: A total of 260 individuals were included in this study, including 127 peri-implantitis patients and 133 healthy implants. CXCR2 gene rs2230054 and rs1126580 polymorphisms in different groups were analyzed by the Chi-square test. The odds ratios (ORs) and 95% confidence intervals (95% CIs) were employed to evaluate the association between CXCR2 polymorphism and peri-implantitis susceptibility. RESULTS: The CT genotype of rs2230054 and the AG genotype and G allele of rs1126580 significantly increased in peri-implantitis patients compared with healthy implants (P < 0.05). The CT genotype of rs2230054 (OR = 1.825, 95% CI = 1.028-3.239) and the AG genotype of rs1126580 (OR = 2.223, 95% CI 1.272-3.885) carriers had a high risk to infect with peri-implantitis. Additionally, these CXCR2 gene polymorphisms have been revealed to be associated with the periodontal status of peri-implantitis patients. CONCLUSION: The CXCR2 gene rs2230054 and rs1126580 polymorphisms were associated with the peri-implantitis susceptibility in the Chinese Han population. The CT genotype of rs2230054 and the AG genotype and G allele of rs1126580 serve as risk factors for the occurrence of peri-implantitis.
