Abstract
Periodontal disease is the most prevalent infectious disease, and inflammatory mediators play critical roles in its progression. Therefore, controlling pro-inflammatory cytokine production, especially at initial disease stages, is essential to maintaining gingival and periodontal health. Glycyrrhizin (GL) has an anti-inflammatory effect and has been added to toothpaste and mouth rinse to prevent periodontal disease. However, there is a maximum dose for the use of GL. The aim of the present study is to screen plant extracts which can effectively enhance the effects of GL. The effects of extracts from six different plants on GL-suppressed TNF-α expression in Aggregatibacter actinomycetemcomitans (A.a.)-LPS-stimulated human oral keratinocytes (RT7) were examined. Results demonstrated that Equisetum arvense (EA) extract had the strongest additive effect on the suppression of TNF-α by GL at both mRNA and protein levels. In addition, GL downregulated the production of TNF-α by suppressing NF-κB p65 phosphorylation, but not JNK or p38 phosphorylation. In contrast, EA decreased JNK phosphorylation but not NF-κB p65 or p38 phosphorylation. The combination of GL and EA effectively attenuated A.a.-LPS-induced phosphorylation of NF-κB p65 and JNK. Furthermore, an LPS-induced periodontitis rat model showed that GL with EA supplementation significantly downregulated TNF-α mRNA in the gingival tissue. These results indicate that EA can suppress A.a.-LPS-induced pro-inflammatory cytokine production by inhibiting JNK activation and can promote the anti-inflammatory effects of GL. Our findings suggest that a combination of GL and EA may improve the development of new oral hygiene products aimed at enhancing periodontal health.
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The scientific support of Hiroshima University, is highly appreciated.
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FS contributed to conception, design, data acquisition and interpretation, analysis. MM contributed to conception, design, data interpretation, analysis. CC, HF, KO and TN contributed to design. SI and RS contributed to conception. TT contributed to conception, design, data interpretation. The first draft of the manuscript was written by FS and MM and TT and all authors provided final approval and agreed to be held accountable for all aspects of the work.
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10266_2020_563_MOESM3_ESM.pptx
Supplementary file3 (PPTX 888 KB) Appendix Figure 2. Time course of LPS-induced signaling pathway in RT7 cells. LPS (A; E.c.-LPS 10 µg/mL, B; P.g.-LPS 10 µg/mL) were applied to RT7 cells. NF-kB p65, and MAPKs (JNK and p38) in RT7 cells were analyzed by Western blotting at various time points. β-actin was used as a loading control. The time course analysis showed that E.c.-LPS induced two peaks of p65 activation at 45 and 90 min. JNK and p38 showed phosphorylation with maximum activation at 45 min (A). Similarly, P.g.-LPS induced maximum activation of p65 and JNK at 60 min. p38 showed phosphorylation with maximum activation at 30, 60 min (B).
10266_2020_563_MOESM4_ESM.pptx
Supplementary file4 (PPTX 763 KB) Appendix Figure 3. Effects of EA and/or GL on the LPS induced signaling pathway in RT7 cells. (A) GL; glycyrrhizin (2.6 µg/mL) and/or EA; Equisetum arvense extract (0.4 µg/mL) were pretreated to RT7 cells for 15 min., then E.c.-LPS (10 µg/mL) was additionally applied on RT7 cells for 45 min. NF-kB p65, and MAPKs (JNK and p38) in RT7 cells were assessed by Western blotting. β-actin was used as loading control. A combination of GL and EA effectively downregulated E.c.-LPS-induced phosphorylation of NF-kB p65, JNK and p38. (B) P.g.-LPS (10 µg/mL) and GL and/or EA were applied on RT7 cells. NF-kB p65, and MAPKs (JNK and p38) in RT7 cells were assessed at 60 min by Western blotting. β-actin was used as loading control. A combination of GL and EA effectively downregulated P.g. -LPS-induced phosphorylation of NF-kB p65, JNK. And slightly downregulated p-p38.
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Shiba, F., Miyauchi, M., Chea, C. et al. Anti-inflammatory effect of glycyrrhizin with Equisetum arvense extract. Odontology 109, 464–473 (2021). https://doi.org/10.1007/s10266-020-00563-3
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DOI: https://doi.org/10.1007/s10266-020-00563-3