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    The effect of menopause on the relationship between hyperlipidemia and periodontal disease via salivary 8-hydroxy-2?-deoxyguanosine and myeloperoxidase levels
    (Taylor & Francis Ltd, 2018) Dogan, Esra Sinem Kemer; Kirzioglu, Fatma Yesim; Dogan, Burak; Fentoglu, Ozlem; Kale, Banu
    Objective: Impairment of the lipid metabolism could affect the periodontal disease; increased oxidative stress may have a role in this relationship. The aim of the present study was to evaluate the role of menopause in the relationship between hyperlipidemia and periodontal disease via oxidative stress markers in saliva. Materials and methods: Sixty-seven women were enrolled in the study and divided into four groups as systemically healthy and premenopause (C) (n=18), hyperlipidemia and premenopause (H) (n=16), systemically healthy and postmenopause (M) (n=17), and hyperlipidemia and postmenopause (MH) (n=16). Sociodemographics, periodontal and metabolic parameters, and saliva oxidative markers (myeloperoxidase [MPO] and 8-hydroxy-2-deoxyguanosine [8-OHdG]) were evaluated. Results: Menopause and/or hyperlipidemia were associated with an increase in all evaluated periodontal parameters. Saliva 8-OHdG and MPO levels were higher in menopausal groups (M and MH). Multivariate linear regression analyses revealed that hyperlipidemia was related to an increase in periodontal parameters. Salivary oxidative stress markers and periodontal parameters were also positively associated with menopause and hyperlipidemia. Conclusion: Saliva 8-OHdG and MPO levels may indicate that the relationship between periodontal disease and hyperlipidemia is aggravated by menopause.
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    The Effects of Omega-3 Supplementation on Serum Oxidative Stress Parameters in Experimental Periodontitis in an Animal Model
    (Wiley, 2021) Dogan, Burak; Dogan, Esra Sinem Kemer
    Experimental studies suggest that omega-3 may be beneficial at preventing alveolar bone loss (ABL) by modulating host immune response. The aim of this study is to evaluate the effects of omega-3 supplementation on ABL and serum oxidative biomarkers in a ligature-induced periodontitis model. Twenty-four Wistar albino rats are divided into 3 groups: control (C, n = 8); ligature-induced periodontitis (L, n = 8); and omega-3 plus ligature-induced periodontitis (O+L, n = 8). All rats are fed with ad libitum diet, and O+L group is additionally supplemented with omega-3 fish oil by oral gavage for 44 days. Experimental periodontitis is induced by placement of ligatures around the maxillary second molars of rats in L and O+L groups. ABL is measured histomorphometrically and serum 8-hydroxy-2'-deoxyguanosine, total antioxidant capacity, and total oxidant status (TOS) are analyzed. ABL is higher in L and O+L groups than the C group. Omega-3 supplementation is significantly reduced ABL in group O+L, compared to L group. Furthermore, TOS levels are lower in O+L group than L group. It is suggested that omega-3 administration may reduce ABL and serum TOS levels, which supports the antioxidant role of omega-3 on periodontal disease pathogenesis. Practical applications: Adjunctive use of omega-3 supplementation in periodontitis seems beneficial, although biochemical mechanisms underlying the conflicting results have not been completely understood. On the other hand, oxidative stress has been used as an appropriate target for host modulation therapies in periodontal disease. Omega-3 supplementation in ligature-induced periodontitis in an animal model successfully reduces alveolar bone loss by modulating serum total oxidant status, which may provide a novel pathway in periodontal disease pathogenesis.
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    Is periodontal inflamed surface area associated with serum and salivary levels of IL-1?, visfatin, and omentin-1 in overweight/obese patients?
    (Springer Heidelberg, 2022) Dogan, Esra Sinem Kemer; Duran, Nizami
    Objectives The aim of this study was to evaluate the levels of salivary and serum interleukin (IL)-1 beta, visfatin, and omentin-1 in the relationship between periodontal disease and overweight/obesity as well as to reveal the possible role of periodontal inflamed surface area (PISA) in this association. Materials and methods Ninety-six individuals (69 females, 27 males) were divided into 4 groups as systemically healthy (H) and non-periodontitis (HnP, n=23), systemically healthy and periodontitis (HP, n= 24), overweight/obese (O) and nonperiodontitis (OnP, n=25), and overweight/obese and periodontitis (OP, n =24). Periodontal parameters were measured, and PISA was calculated. IL-1 beta, visfatin, and omentin-1 levels in saliva and serum samples were analysed. Results Periodontal parameters deteriorated, salivary and serum IL-1 beta and visfatin levels were increased, and omentin-1 levels were decreased in OnP and OP groups, compared to HnP and HP groups. Salivary and serum IL-1 beta and visfatin levels were increased and omentin-1 levels were decreased in periodontitis groups, compared to HnP and OnP groups. PISA was negatively correlated with salivary omentin-1 and positively correlated with salivary and serum visfatin in H and O groups, whereas a positive relationship was found between PISA and salivary and serum IL-1 beta in H group. Conclusions PISA may be negatively associated with salivary omentin-1, while positively correlated with salivary and serum visfatin in overweight/obese patients.
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    Is the relationship between periodontitis and hyperlipidemia mediated by lipoprotein-associated inflammatory mediators?
    (Korean Acad Periodontology, 2020) Fentoglu, Ozlem; Bulut, Memduha Tozum; Dogan, Burak; Kirzioglu, Fatma Yesim; Dogan, Esra Sinem Kemer
    Purpose: The aim of this study was to evaluate the serum levels of oxidized low-density lipoprotein (oxLDL), anti-oxLDL, and myeloperoxidase (MPO) in hyperlipidemic patients with periodontal disease. Methods: This study included 123 patients with hyperlipidemia categorized based on metabolic control as mild to moderate (H1) (n=66) or poor (H2) (n=57), as well as systemically healthy controls (C) (n=68). Serum levels of lipids, oxLDL, anti-oxLDL, and MPO were evaluated, along with clinical periodontal parameters. Results: The percentage of bleeding on probing (BOP%) and the clinical attachment level were significantly higher in the H2 group than in the C group. Patients with hyperlipidemia had a relatively high risk of developing periodontal disease. The oxLDL and anti-oxLDL levels were higher in H2 patients with periodontitis than in the control or H1 patients with periodontitis. In the H1 and H2 groups, the ratio of total cholesterol to high-density lipoprotein was significantly correlated with gingival index, BOP%, and oxLDL levels. Conclusions: Our findings indicate that the lipoprotein-associated inflammatory mediators of oxLDL, anti-oxLDL, and MPO may play an important role in the relationship between periodontal disease and hyperlipidemia. Conclusions: Our findings indicate that the lipoprotein-associated inflammatory mediators of oxLDL, anti-oxLDL, and MPO may play an important role in the relationship between periodontal disease and hyperlipidemia.
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    The role of menopause on the relationship between metabolic risk factors and periodontal disease via salivary oxidative parameters
    (Wiley, 2018) Dogan, Esra Sinem Kemer; Kirzioglu, Fatma Yesim; Dogan, Burak; Fentoglu, Ozlem; Kale, Banu; Carsancakli, Suleyman Akif; Orhan, Hikmet
    Background: Periodontal disease is shown to be aggravated by an increase in the count of metabolic risk factors. This study aims to evaluate the effects of metabolic risk factors on periodontal parameters and salivary oxidative stress markers related to menopausal status. Methods: One hundred and seventy-six women were categorized according to menopausal status, either premenopause (Pre/M) (n = 86) or postmenopause (Post/M) (n = 90). The count of metabolic risk factors was evaluated. Sociodemographics and systemic status were determined via questionnaire and medical records. After clinical periodontal measurements and saliva collection, myeloperoxidase (MPO), total oxidant status (TOS) and total antioxidant capacity (TAOC) were determined by enzyme-linked immunosorbent assay and automatic colorimetric method. Oxidative stress index (OSI) was also calculated. Results: The count of metabolic risk factors was higher in the Post/M group than the Pre/M group. Periodontal parameters and TOS levels were elevated by an increase in the count of metabolic risk factors. Multivariate regression analyses revealed that periodontal (clinical attachment level and missed teeth) and oxidative (MPO and OSI) parameters increased and TAOC levels decreased due to menopause. Additionally, positive relationships between periodontal and oxidative parameters were determined. Conclusion: These findings suggest that salivary oxidative stress level may be an indicator of worsened periodontal status related to menopause and the count of metabolic risk factors.
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    The role of serum lipoxin A4 levels in the association between periodontal disease and metabolic syndrome
    (Korean Acad Periodontology, 2019) Dogan, Esra Sinem Kemer; Dogan, Burak; Fentoglu, Ozlem; Kirzioglu, Fatma Yesim
    Purpose: An unresolved inflammatory state contributes to the pathogenesis of periodontal disease and metabolic syndrome (MetS). Therefore, the purpose of this study was to evaluate the role of lipoxin A4 (LXA4), a proresolving lipid mediator, in the association between periodontal disease and MetS. Methods: Sixty-seven patients with MetS and 65 patients without MetS were included in the study. Sociodemographic information was obtained via a questionnaire, and detailed medical diagnoses were made. Periodontal parameters (plaque index [PI], gingival index [GI], probing pocket depth [PD], and clinical attachment level [CAL]) and metabolic parameters were measured, and serum LXA4 levels were determined. The associations among MetS, periodontal parameters, and serum LX levels were evaluated by adjusted multivariate linear regression analyses. Results: Patients with MetS were older and had a higher body mass index than patients without MetS. Periodontal parameters (PI, GI, PD, and CAL) were higher in patients with MetS than in those without MetS. Serum LXA4 levels were higher in patients without MetS. Multivariate linear regression analysis indicated a positive association between MetS and periodontal parameters (PD and CAL). Negative associations were established between MetS and LXA4 levels, and between LXA4 and periodontal parameters (PI, PD, and CAL). Conclusions: The presence of higher values of periodontal parameters in patients with MetS and the negative relationship of LXA4 with MetS and periodontal disease may support the protective role of proresolving lipid mediators in the association between periodontal disease and MetS.