ABSTRACT
Objective:To explore the effect of silent information regulator 1 (SIRT1) activator SRT1720 on inflammatory response in chronic periodontal disease mice and whether its mechanism is related to the toll like receptor 4 (TLR4)/nuclear factor κB (NF-κB) signaling pathway.Methods:Forty 8-week-old male C57BL/6 mice were selected and divided into a blank control group ( n=8) and an experimental group ( n=32). The experimental group mice were ligated with periodontal pockets and fed with high sugar drinking water. The experimental group was randomly divided into a model group ( n=8) and an SRT1720 group ( n=24). The blank control group and the model group were given physiological saline orally every day. The SRT1720 group was further divided into a low dose group [20 mg/(kg·d), n=8], a medium dose group [50 mg/(kg·d), n=8], and a high dose group [100 mg/(kg·d), n=8] based on the different doses of SRT1720. Four weeks later, the expression levels of interleukin-6 (IL-6), interleukin-1β (IL-1β) and monocyte chemoattractant protein-1 (MCP-1) in gingival crevicular fluid of mice in each group were detected by enzyme linked immunosorbent assay (ELISA); The real-time quantitative polymerase chain reaction (RT-qPCR) method was used to detect the mRNA expression levels of IL-6, IL-1β, MCP-1, SIRT1, TLR4, NF-kB p65 in the gingival tissue of mice in each group; Western blot was used to determine the expression levels of SIRT1, TLR4, and NF-κB p65 proteins in mouse gingival tissue. Results:Compared with the blank control group, the expression levels of IL-6, IL-1β, and MCP-1 inflammatory factors in the gingival crevicular fluid of experimental group mice increased, while the expression levels of IL-6, IL-1β, MCP-1, TLR4, NF-κB p65 mRNA in gingival tissue increased. The expression levels of TLR4, NF-κB p65 protein in gingival tissue increased, while the expression levels of SIRT1 mRNA and protein in gingival tissue decreased, with statistical significance (all P<0.05). Compared with the model group, the expression levels of IL-6, IL-1β, and MCP-1 inflammatory factors in the gingival crevicular fluid, IL-6, IL-1β, MCP-1, TLR4, NF-κB p65 mRNA expression levels in gingival tissue, and TLR4, NF-κB p65 protein expression levels in the gingival tissue of SRT1720 group mice showed a dose-dependent decrease. The expression levels of SIRT1 mRNA and protein in gingival tissue showed a dose-dependent increase, and the differences were statistically significant (all P<0.05). Conclusions:SIRT1 activator SRT1720 can improve the inflammatory response of chronic periodontal disease mice, which may be related to the inhibition of TLR4/NF-kB signaling pathway.