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    Gingival crevicular fluid Bax, Bcl-xl, interleukin-22, and transforming growth factor beta 1 levels in stage III periodontitis
    (Wiley, 2024) Afacan, Beral; Budak, Utkucan; Altinyurek, Ece Erdem; Ozden, Can; Cevik, Ozge; Kose, Timur; Emingil, Gulnur
    Background Intrinsic apoptosis plays a critical role in immune defense and inflammation. Its dysregulation is involved in various chronic diseases. The B-cell lymphoma 2 (Bcl-2) family primarily mediates this mitochondrial pathway. This study aimed to investigate the proapoptotic Bcl-2-associated X protein (Bax) and antiapoptotic B-cell lymphoma-extra large (Bcl-xl) levels and their association with interleukin-22 (IL-22) and transforming growth factor beta 1 (TGF-beta 1) in the gingival crevicular fluid (GCF) of patients with periodontitis. Methods A total of 75 systemically healthy nonsmokers were enrolled, of whom 23 had stage III periodontitis, 26 had gingivitis, and 26 were periodontally healthy. Whole-mouth clinical periodontal measurements were recorded. Bax, Bcl-xl, IL-22, and TGF-beta 1 levels in the GCF were determined by enzyme-linked immunosorbent assay (ELISA). Data were analyzed using nonparametric statistical tests. Results The periodontitis group had significantly lower GCF Bax levels than the gingivitis group (p < 0.05). The periodontitis and gingivitis groups had higher GCF Bcl-xl levels than the periodontally healthy group (p < 0.05). GCF IL-22 levels were similar in all groups (p > 0.05). The periodontitis group had lower GCF TGF-beta 1 levels than the gingivitis and periodontally healthy groups (p < 0.05). The diseased groups had a lower GCF Bax/Bcl-xl ratio than the healthy controls (p < 0.05). IL-22 was positively correlated with Bax (p < 0.05). Conclusions This is the first study investigating GCF Bax and Bcl-xl levels in periodontal health and disease. Increased GCF Bcl-xl levels and a decreased Bax/Bcl-xl ratio in stage III periodontitis implicate that those apoptotic proteins may be involved in the pathogenesis of periodontal disease. Further studies are needed to enlighten the possible role of Bax and Bcl-xl and their association with IL-22 and TGF-beta 1 in periodontal diseases.
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    Oral biofluid levels of Activin-A and interleukin-1beta in stage III periodontitis
    (Springer Heidelberg, 2024) Ozden, Can; Afacan, Beral; AtmacaIlhan, Harika; Kose, Timur; Emingil, Gulnur
    Objectives Activin-A belongs to the transforming growth factor-beta superfamily and is a multifunctional cytokine that plays a role in inflammation, immune response, tissue repair and regeneration. Proinflammatory cytokine interleukin-1beta (IL-1 beta) can increase Activin-A expression in various cell types. This study aims to evaluate gingival crevicular fluid (GCF) and salivary Activin-A and IL-beta levels in stage III periodontitis. Materials and methods 23 patients with stage III periodontitis, 26 with gingivitis and 26 periodontally healthy individuals were included. Full-mouth clinical periodontal indices were recorded, unstimulated whole saliva and GCF samples were obtained, Activin-A and IL-1 beta total amounts were determined by ELISA. Statistical comparisons were performed using non-parametric tests. Receiver operating characteristics curve was used for estimating the area under the curve (AUC). Results Periodontitis group exhibited significantly lower GCF Activin-A levels but higher IL-1 beta levels than the periodontally healthy group (p < 0.05). Gingivitis group had similar GCF Activin-A and IL-1 beta levels to the periodontitis and periodontally healthy groups (p > 0.05). Salivary Activin-A and IL-1 beta concentrations were similar among study groups (p > 0.05). GCF Activin-A level showed an excellent diagnostic performance (an AUC value of 0.82 with 87% sensitivity) to discriminate periodontitis from periodontal health. ConclusionsFor the first time, this study demonstrated oral biofluid levels of Activin-A in periodontal health and diseases. Within the limits of the study, it might be suggested that diseased sites in periodontitis are associated with reduced Activin-A and increased IL-1 beta levels in GCF.Clinical relevance.Reduced GCF Activin-A levels and the accompanying increase in IL-1 beta might be associated with diseased sites in stage III periodontitis. ConclusionsFor the first time, this study demonstrated oral biofluid levels of Activin-A in periodontal health and diseases. Within the limits of the study, it might be suggested that diseased sites in periodontitis are associated with reduced Activin-A and increased IL-1 beta levels in GCF.Clinical relevance.Reduced GCF Activin-A levels and the accompanying increase in IL-1 beta might be associated with diseased sites in stage III periodontitis. ConclusionsFor the first time, this study demonstrated oral biofluid levels of Activin-A in periodontal health and diseases. Within the limits of the study, it might be suggested that diseased sites in periodontitis are associated with reduced Activin-A and increased IL-1 beta levels in GCF.Clinical relevance.Reduced GCF Activin-A levels and the accompanying increase in IL-1 beta might be associated with diseased sites in stage III periodontitis.