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Gene & Protein in Disease                                  A prediction on how Epimedii herba treat periodontitis




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            Figure 4. Protein–protein interaction (PPI) network. (A) PPI network of key targets of Epimedii herba (EH) for periodontitis. (B) PPI network of targets
            screened according to the degree value, represented by node size and color depth

                                                               periodontitis were significantly higher than those in healthy
                                                               people, suggesting a positive correlation between MMP9 and
                                                               periodontitis development.  The occurrence of periodontal
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                                                               inflammation is also closely associated with oxidative stress.
                                                               For instance, excessive reactive oxygen species produced by
                                                               periodontal inflammation can aggravate the inflammatory
                                                               response and activate osteoclasts, resulting in alveolar bone
                                                               resorption  in  patients  with  periodontitis.  Furthermore,
                                                               MMP9, as a key gene regulating oxidative stress, can affect
                                                               the differentiation process of osteoclasts, aggravate the
                                                               inflammation of periodontal tissue, and induce the further
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                                                               absorption  of  periodontal  supporting  tissues.   Another
                                                               key  target, ESR1,  exerted  the  best  binding effect  with
                                                               8-isopentenyl-kaempferol. Genetic polymorphisms involved
                                                               in estrogen activity may contribute to women’s susceptibility
            Figure 5. Key targets of Epimedii herba (EH) for periodontitis. The top   to periodontitis, and the estrogen receptor alpha gene
            10 key targets based on the degree value, with darker colors representing   (ESR1) PvuII and XbaI polymorphisms are associated with
            greater degree value                               metabolic and pro-inflammatory factors in PCOS.  ESR1 is
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                                                               related to the development of bone resorption, which plays
              Molecular docking results showed that the active   a vital role in bone metabolism, as observed in people who
            components of EH had a higher −CIE value with MMP9   have bone loss after menopause or get osteopenia with ESR1
            and ESR1, suggesting that they are the primary targets of EH   defect. 41,42  Through multiple pathways and cytokines, ESR1
            in periodontitis treatment. MMP9 is closely associated with   can inhibit osteoclast differentiation and longevity, inducing
            inflammation, with its expression significantly increasing   the apoptosis of osteoclasts.  Another possible pathway is
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            in inflammatory diseases such as chronic periodontitis and   that ESR1 in osteoclasts induces Fas ligand expression, which
            rheumatoid arthritis.  MMP9 is also a potential biomarker of   in turn causes cell death through an autocrine mechanism.
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            periodontitis, which can process the neutrophil chemotactic   ESR1 can also inhibit the NF-κB-mediated transcription of
            factor IL-8 and then improve its chemotactic effect on   the IL-6 promoter by reducing the NF-κB DNA-binding
            inflammatory neutrophils. In fact, it has been reported that   activity, thereby regulating inflammation, immunity, and
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            the levels of MMP9 in serum, GCF, and saliva of patients with   stress responses.  Therefore, it can be concluded that
            Volume 3 Issue 4 (2024)                         8                               doi: 10.36922/gpd.4427
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