Serum high-density lipoprotein cholesterol level associated with the extent of periodontal inflammation in type 1 diabetic subjects.

AIM: High-density lipoprotein (HDL) cholesterol is known for its anti-inflammatory and antioxidant activities in protection against cardiovascular diseases. We investigated whether a protective association also exists between serum HDL and periodontal inflammation in type 1 diabetic subjects (T1DM). METHODS: Plaque and periodontal inflammation (bleeding and PD ≥ 4 mm) were examined in 80 subjects with T1DM. The serum levels of glycosylated haemoglobin (HbA1c, %) and HDL (mmol/l) were determined. Adjusted associations between inflammation and serum HDL were analysed using linear regression analysis. To study the linearity of the association, the subjects were categorized into HDL tertiles (I-III). RESULTS: A statistically significant negative association was observed between serum HDL level and the extent of bleeding and PD ≥ 4 mm. Subjects in HDL tertiles II and III (high HDL) presented significantly fewer inflamed sites when compared with the subjects in tertile I (low HDL), whereas no significant difference in the number of inflamed sites was observed between tertiles II and III. CONCLUSIONS: Based on the finding of a negative association between serum HDL and periodontal inflammation, HDL may be considered a marker of susceptibility to periodontal inflammation. A longitudinal study is needed to verify possible causal relationship between serum HDL and inflammation.

Serum interleukin-6 may modulate periodontal inflammation in type 1 diabetic subjects.

AIMS: To evaluate the associations between serum inflammatory biomarkers and periodontal inflammation in subjects with type 1 diabetes mellitus (T1DM). Our hypothesis was that local host responses may be modulated by the serum inflammatory mediators. MATERIAL AND METHODS: Plaque, bleeding on probing and probing pocket depth (PD) were examined in 80 T1DM subjects at the baseline and in 58 subjects 8 weeks after periodontal therapy. The levels of glycosylated haemoglobin, serum interleukin (IL)-6, ultrasensitive C-reactive protein and the lipid profile were measured at the baseline and after therapy. Stratification of the sample separately by smoking and body mass index (BMI) was performed. Adjusted associations between the levels of systemic biomarkers and periodontal parameters were studied using multiple regression models. RESULTS: The level of serum IL-6 was associated with the extent of bleeding and PD≥4 mm at the baseline in non-smokers and in subjects with BMI≤26 kg/m(2). These associations were also evident after periodontal therapy. Subjects with a high after-therapy IL-6 level presented poorer periodontal healing than those with a low level. CONCLUSIONS: The observed associations may be considered to be suggestive of a modulatory effect of IL-6 on host responses in T1DM subjects.

Serum levels of interleukin-10 and tumour necrosis factor-α in chronic periodontitis.

AIMS: To investigate, using a cross-sectional study design, whether the extent of periodontal inflammation associates with the serum levels of cytokine interleukin (IL)-10 and tumour necrosis factor (TNF)-α and their ratio. MATERIAL AND METHODS: The study group consisted of 61 subjects with chronic periodontitis and 30 control subjects with minimally inflamed periodontal tissues. Probing pocket depth (PD), bleeding on probing (BOP) and periodontal attachment level (AL) were measured. The serum IL-10 (pg/ml) and TNF-α (U/l) levels were analysed using enzyme-linked immunosorbent assays. After categorization of the subjects, associations between serum IL-10 and TNF-α levels and the extent of periodontal inflammation were studied using linear regression models adjusted for age, gender, body mass index and smoking. RESULTS: A negative, partly dose-dependent association existed between the extent of BOP, PD ≥ 4 mm and AL ≥ 4 mm and serum IL-10 level. The subjects in the periodontitis group presented significantly higher serum TNF-α levels and their TNF-α/IL-10 ratio was approximately threefold when compared with the ratio in the control group. CONCLUSIONS: The significantly higher serum TNF-α/IL-10 ratio in the subjects with chronic periodontitis when compared with the ratio in the controls is indicative of a stronger systemic pro-inflammatory state in chronic periodontitis.

Matrix metalloproteinase-8 concentration in shallow crevices associated with the extent of periodontal disease.

OBJECTIVE: The aim of this study was to analyse the association between matrix metalloproteinase-8 (MMP-8) concentration in shallow, mostly non-bleeding gingival crevices, and the extent of periodontal disease. MATERIAL AND METHODS: Plaque, bleeding on probing (BOP), probing pocket depth (PPD) and attachment level (AL) were assessed clinically in 48 patients with chronic periodontitis. MMP-8 concentrations in gingival crevicular fluid (GCF) from four shallow (PPDor=4 mm (p=0.028) and AL>or=6 mm (p<0.001). CONCLUSION: The above association between MMP-8 concentration in shallow crevices and attachment loss provides a new aspect to future studies of MMP-8 as a prognostic marker for periodontal disease.