[Show abstract][Hide abstract] ABSTRACT: To investigate the effect of Porphyromonas gingivalis (Pg) with different fimA genotypes on vascular cell adhesion molecule-1 (VCAM-1) and intercellular adhesion molecule-1 (ICAM-1) production by human umbilical vein endothelial cells (HUVEC).
In the present study, PgATCC33277 (type I fimA genotype), WCSP 115 (type II fimA genotype), W83 (type IV fimA genotype), and Escherichia coli-lipopolysaccharide (Ec-LPS) were designed as experimental group 1, 2, 3, and positive control group, respectively, to stimulate HUVEC, and the un-stimulated HUVEC were analyzed as negative control group. The three strains of Pg were cultured anaerobically in standard condition, and then the Pg cells and Ec-LPS were co-cultured with HUVEC for 2, 6, and 24 h, respectively. The amount of ICAM-1 and VCAM-1 produced by HUVEC was detected with flow cytometry (FCM). The expression of ICAM-1 and VCAM-1 by HUVEC were assayed with confocal laser scanning microscope (CLSM).
The expression of ICAM-1 on the surface of HUVEC were intensified after infected by Pg with I, II, and IV fimA genotypes (P < 0.05). The amounts of ICAM-1 were 60.27 ± 5.43, 80.81 ± 1.44, and 85.94 ± 2.56 for Pg with type I fimA genotype, 86.69 ± 8.81, 90.19 ± 0.00, and 96.18 ± 0.48 for Pg with type II fimA genotype, 59.66 ± 0.40, 85.79 ± 4.86, and 96.04 ± 2.07 for Pg with type IV fimA genotype at 2, 6 and 24 h after infection, respectively. The up-regulation effects caused by Pg with type II and IV fimA genotypes were stronger than those caused by Pg with type I fimA genotype at different time points except at 2 h (P < 0.05). Under the present experimental condition, infected by Pg with type I, II and IV fimA genotypes stimulated low expression of VCAM-1 by HUVEC, it showed no significant differences among all the groups (P > 0.05). Expression of ICAM-1 and VCAM-1 in Pg infected HUVEC were confirmed by CLSM. Infection of HUVEC with Pg resulted in more fluorescence staining of ICAM-1 and VCAM-1 compared with that in uninfected HUVEC cultures.
The virulence and pathogenicity of Pg is associated with its fimA genotypes, Pg with type II and IV fimA genes possess stronger ability to stimulate HUVEC to up-regulate the expression of cell adhesion molecules, which may lead to disorders in vascular endothelial function.
No preview · Article · Jun 2011 · Zhonghua kou qiang yi xue za zhi = Zhonghua kouqiang yixue zazhi = Chinese journal of stomatology
[Show abstract][Hide abstract] ABSTRACT: To investigate the effects of C-reactive protein (CRP) on monocytes chemotaxis ability in vitro.
Transwell chemotaxis assay was used to evaluate the changes of chemotactic ability of THP-1 monocytes in each group treated with CRP in different concentration.
CRP increased the number of attracted monocytes in response to MCP-1 (monocyte chemoattractant protein-1). When treated with CRP concentration at 2 microg x mL(-1), the number of chemotactic monocytes increased (P < 0.05). The number of attracted monocytes increased as CRP concentration was elevated (P < 0.05).
CRP can increase chemotactic ability of THP-1 monocytes in concentration dependent manner.
No preview · Article · Dec 2009 · Hua xi kou qiang yi xue za zhi = Huaxi kouqiang yixue zazhi = West China journal of stomatology
[Show abstract][Hide abstract] ABSTRACT: To investigate the correlation between moderate to severe periodontitis and coronary heart disease (CHD) and to examine the serum C-reactive protein (CRP) levels in subjects with CHD and/or moderate to severe periodontitis.
Serum CRP levels, serum lipids [low density lipoprotein-cholesterol (LDL-C), high density lipoprotein-cholesterol (HDL-C), total cholesterol (TC) and triglyceride (TG)] and clinical periodontal parameters [clinical attachment loss (CAL), probing depth (PD), and bleeding on probing (BOP)] were measured and analyzed in coexistent moderate to severe periodontitis and CHD patients (n = 47), CHD patients (n = 28), moderate to severe periodontitis patients (n = 40), and healthy subjects (n = 40).
The serum CRP levels in control group, moderate to severe periodontitis patients, CHD patients and patients with both diseases were (1.30 +/- 0.15), (2.44 +/- 0.18), (5.99 +/- 0.82) and (6.88 +/- 0.71) mg/L, respectively. The differences among these four groups were significant (P < 0.001). The multivariate logistic regression revealed that moderate to severe periodontitis patients exhibited markedly elevated odds of having CHD (OR = 2.417, 95% CI: 1.126 - 6.659). The total cholesterol levels were also significantly different among the four groups (P = 0.017).
The moderate to severe periodontitis was associated with elevated serum CRP levels which may in turn affect the initiation and progression of CHD, and may be a risk factor for CHD.
No preview · Article · Apr 2009 · Zhonghua kou qiang yi xue za zhi = Zhonghua kouqiang yixue zazhi = Chinese journal of stomatology
[Show abstract][Hide abstract] ABSTRACT: To investigate the correlation between moderately and severely chronic periodontitis and coronary heart disease, as well as the role of fibrinogen in the mechanisms responsible for the correlation between periodontitis and coronary heart disease.
95 subjects who were systemic health or patients of coronary heart disease with or without periodontitis were enrolled. All the subjects were placed into 4 groups based on their periodontal status and cardiovascular health. The 4 groups were healthy control group (HC), moderately and severely chronic periodontitis group (MSP), coronary heart disease group(CHD), and MSP coexisted with CHD group (MSP+CHD). Clinical periodontal index were examined, at the same time, plasma fibrinogen levels and serological changes used in diagnosing of cardiovascular disease routinely were determined. ANOVA and ANCOVA were used in the statistical analysis.
Fibrinogen levels of HC, MSP, CHD, and MSP+CHD group were (2.36+/-0.37), (3.63+/-0.73), (4.08+/-0.84), and (4.14+/-0.96) g/L, respectively. Fibrinogen levels of MSP and MSP+CHD group were significantly higher than that of healthy controls (P<0.01). The patients with moderately to severely chronic periodontitis were more likely to have coronary heart disease as compared to periodontally healthy controls (OR=2.527, P=0.047) after adjusted for blood pressure and body mass index.
Moderately and severely chronic periodontitis maybe a risk factor of coronary heart disease and fibrinogen could be one of the biological basis which links periodontitis with coronary heart disease.
No preview · Article · Jun 2008 · Hua xi kou qiang yi xue za zhi = Huaxi kouqiang yixue zazhi = West China journal of stomatology
[Show abstract][Hide abstract] ABSTRACT: To investigate the relationship between plasma levels of fibrinogen, the-beta455 G/A fibrinogen gene polymorphism and the severity of periodontal inflammation and to explore the possible role of fibrinogen in the association of periodontitis with coronary heart disease (CHD).
A total of 121 patients with moderate to severe periodontitis and periodontally healthy and gingivitis controls were enrolled in the study. Peripheral blood samples were collected and the plasma fibrinogen levels were determined by the clotting method of Clauss. Polymerase chain reaction and restriction fragment length polymorphism analysis with Hae III were used to examine the -beta455 G/A fibrinogen gene polymorphism.
Fibrinogen levels were significantly higher in moderately or severely chronic periodontitis patients [(3.45 +/- 0.68) g/L] than periodontally healthy and gingivitis controls [(2.47 +/- 0.42) g/L, P < 0.001]. The carrier status of the A allele at position -455 in the beta fibrinogen gene was associated with elevated fibrinogen levels and the frequency of the-A455 allele in the beta fibrinogen gene in the patient group was significantly higher than in the control group (P = 0.032). Carriers of the -A455 allele were about 3-fold more likely to have moderate or severe periodontitis as compare to individuals without the -A455 allele( OR = 3. =135, P= 0.008).
Fg-beta455 G/A polymorphism may contribute to the elevated plasma fibrinogen levels and put individuals at higher risk of having severe periodontitis. As the independent risk factor of CHD, fibrinogen levels and Fg-beta455 G/A polymorphism may play a role in the pathogenesis of periodontitis.
No preview · Article · Mar 2008 · Zhonghua kou qiang yi xue za zhi = Zhonghua kouqiang yixue zazhi = Chinese journal of stomatology
[Show abstract][Hide abstract] ABSTRACT: To investigate the effect of one of the acute-phase proteins, fibrinogen, on the release of IL-1beta and -8 by human peripheral polymorphonuclear leukocytes (PMN) and the possible role of fibrinogen during the destruction of periodontium.
Peripheral PMN were isolated by discontinuous density gradient centrifuging technique. The freshly isolated PMN were suspended in Hank's balanced saline solution (1 x 10(9)/L) supplemented with 0.5% BSA and 0.1% glucose. The levels of IL-1beta and -8 in the supernatants produced by cultured cells upon the addition of human fibrinogen at different concentrations were measured by ELISA technique.
Incubated with human fibrinogen at 2 g/L or 10 g/L for different time periods, human peripheral PMN released significantly greater amount of IL-1beta [(10.41 +/- 0.37) - (35.86 +/- 0.30) ng/L or (22.81 +/- 0.45) - (57.77 +/- 2.08) ng/L] and IL-8 [(93.90 +/- 13.95) - (2045.66 +/- 53.03) ng/L or (115.02 +/- 10.61) - (3858.69 +/- 25.65) ng/L] than PMN without the stimulation of fibrinogen (IL-1beta, P < 0.001, and IL-8, P < or = 0.016). The higher concentration of fibrinogen or the longer treatment time, the higher levels of IL-1beta and -8 were released by PMN (P < 0.001).
Fibrinogen induced the secretion of pro-inflammatory cytokines IL-1beta and -8 by PMN and may be involved in magnification of the inflammatory response of periodontium and bone resorption.
No preview · Article · Feb 2008 · Zhonghua kou qiang yi xue za zhi = Zhonghua kouqiang yixue zazhi = Chinese journal of stomatology
[Show abstract][Hide abstract] ABSTRACT: To investigate the expression of MMP-2 and MMP-3 in periodontal tissues of rat periodontitis model at different stages of inflammation of varied severity.
The periodontal tissues were immunohistochemically stained by antibody of MMP-2 and MMP-3.
MMP-2 and MMP-3 were both strongly positive in gingival epithelia and fibroblasts in periodontal ligament in rat periodontitis model. And chronic periodontitis showed lower expression of MMP-2 and MMP-3 than that of acute gingivitis and acute peridontitis.
The expression of MMP-2 and MMP-3 varies in different stage of periodontitis. MMP-2 and MMP-3 may play an important role in development of periodontitis.
No preview · Article · Jul 2006 · Hua xi kou qiang yi xue za zhi = Huaxi kouqiang yixue zazhi = West China journal of stomatology
[Show abstract][Hide abstract] ABSTRACT: To study the role of fibrinogen molecule in the pathogenesis of periodontal diseases.
An in vitro cell culture model was used. Methyl-(3)H Thymidine radiolabeled Porphyromonas gingivalis (Pg) ATCC 33277 were examined for their ability to adhere to and invade the confluent monolayers of human oral epithelial KB cells with or without exogenous human fibrinogens by scintillation spectrometry.
The addition of exogenous fibrinogens made more amount of and higher ratios of adhesive and invasive Pg, in contrast to the group without exogenous fibrinogen (P < 0.001). At different concentrations of exogenous fibrinogen, the amount and ratios of adhesive and invasive Pg varied significantly (P < or = 0.007). The higher concentrations of exogenous fibrinogen was added, the greater amount and ratios of adhesive and invasive Pg were found.
Fibrinogen promotes the adherence of Pg to human oral epithelial cells and may play an important role in the pathogenesis of periodontal diseases.
No preview · Article · Mar 2006 · Zhonghua kou qiang yi xue za zhi = Zhonghua kouqiang yixue zazhi = Chinese journal of stomatology