Bacterium Porphyromonas Gingivalis Research Articles

The Anti-Inflammatory Effect of Nigella sativa Toothpaste on Porphyromonas gingivalis Bacteria Through Decreased TNF-α, MMP-9, PGE-2 Expression in Wistar Rats.

The main principle in preventing periodontal disease is to improve oral hygiene. The bacteria that cause the onset of periodontal disease, one of which is the Porphyromonas gingivalis bacterium, causes inflammation. Persistent inflammation causes tissue damage and alveolar bone resorption by secreting proinflammatory cytokines, matrix metalloproteinase-9 (MMP-9), prostaglandin E2 (PGE-2), and anti-inflammatory cytokines. In this case, preventive treatment is needed, such as using toothpaste that contains anti-inflammatories so that the progression of the disease does not get worse. The traditional ingredient currently being developed is Nigella sativa, which has anti-inflammatory properties. Therefore, this study analyzes the potential of toothpaste containing Nigella sativa on the expression of tumor necrosis factor-α (TNF-α), MMP-9, and PGE-2 in the Wistar rat model induced by Porphyromonas gingivalis bacteria. This study aims to prove the potential of Nigella sativa toothpaste to decrease the expression of PGE-2, TNF-α, and MMP-9 in the gingiva of rats induced by Porphyromonas gingivalis bacteria. Forty-five healthy male Wistar rats were used, consisting of the negative control group, which was only injected with Porphyromonas gingivalis bacteria ATCC3322. The positive control group was given enzyme toothpaste, and the treatment group was assigned 1 mg of Nigella sativa paste using a microbrush for 30 seconds on the gingiva incisors mandibular with a circular motion, given two times a day for a week. Immunohistochemical to see the expression of TNF-α, PGE-2, and MMP-9. Parametric comparative analysis using a one-way analysis of variance test was performed to analyze differences between groups. Nigella sativa toothpaste significantly reduced proinflammatory cytokines, as seen through the expression of TNF-α, PGE-2, and MMP-9 on days 3, 5, and 7 (p <0.05). In the limit of studied animal model, this trial indicates that giving toothpaste with black seed extract (Nigella sativa) could inhibit inflammatory mediators, as seen from the decreased expression of MMP-9, TNF-α, and PGE-2 seen from the 3rd, 5th, and 7th days.

The Influence of Streptococcus mutans Biofilm Formation in a Polymicrobial Environment (Streptococcus gordonii & Porphyromonas gingivalis).

Biofilms play a vital role in the occurrence or worsening of an infectious disease. Streptococcus mutans is a bacterium with the ability to form biofilms that plays a key role in the development of infectious diseases such as dental caries. The formation of biofilms in S. mutans is mediated by quorum sensing. Inhibiting quorum sensing can be considered as one of the approaches to prevent caries. This study aims to investigate the ability of Streptococcus gordonii and Porphyromonas gingivalis bacteria to inhibit the formation of S. mutans biofilm. This research was conducted to analyze bacterial biofilm formation and metabolism. The bacteria used are S. mutans (serotype C), S. gordonii (ATCC 5165), and P. gingivalis (ATCC 33277). Biofilm formation was analyzed using the crystal violet assay. Bacterial metabolism was analyzed using the methylthiazol tetrazolium (MTT) assay. The results of the crystal violet assay indicate a decrease in biofilm formation in S. mutans when in the presence of S. gordonii and S. mutans in the presence of P. gingivalis. The results of the MTT assay show no significant change in the bacterial metabolism of S. mutans in the presence of S. gordonii and S. mutans in the presence of P. gingivalis. However, S. mutans with the presence of S. gordonii and P. gingivalis show an increase in biofilm formation and bacterial metabolism. S. gordonii and P. gingivalis are each capable of inhibiting the formation of S. mutans biofilm in a polymicrobial environment.

РОЛЬ МОЛЕКУЛЯРНО-ГЕНЕТИЧЕСКИХ МЕТОДОВ ИССЛЕДОВАНИЙ В ЭТИОПАТОГЕНЕЗЕ ОСТЕОМИЕЛИТА ЧЕЛЮСТЕЙ

The subject of the study is the importance of molecular genetic research methods in the study of the etiopathogenesis of osteomyelitis of the jaws. The purpose of the work is to provide up-to-date information to researchers, dental surgeons, and maxillofacial surgeons on the possibilities of molecular genetic research in identifying bacterial pathogens in osteomyelitis of the jaws, as well as to reflect genetic markers of pathogenicity factors for a number of the main causative agents of the disease. Methodology. International scientific databases PubMed, ScienceDirect, Scopus, Cochrane Collaboration, Elsevier, as well as electronic catalogs eLIBRARY.RU and CyberLeninka.ru were used. Results. A review of publications demonstrated that S. aureus and S. Epidermidis dominate the etiological spectrum of causative agents of bone tissue infections. The participation of these microorganisms is determined by a whole range of pathogenicity factors. Toxins and Panton-Valentine leukocidin (PVL) genes play a major role in the pathogenesis of osteomyelitis and disease progression. It has been shown that the pathogenic bacteria Porphyromonas gingivalis and Aggregatibacter actinomycetemcomitans are capable of inducing differentiated production of cytokines. The most attention has been attracted to E. faecium, which exhibits multidrug resistance to a wide range of antibiotics. The proportion of infections mediated by S. epidermidis and S. Saprophyticus is, on average, about 25% of cases. The proportion of representatives of gram-negative flora Escherichia, Klebsiella, Enterobacter, Citrobacter, Proteus, Providencia, Serratia reaches 23% of cases. Pathogenic nosocomial strains of P. aeruginosa are also involved in the formation of chronic inflammation in osteomyelitis. According to the results of published studies, more than a third of cases of chronic osteomyelitis are mediated by microbial associations, which are dominated by S. aureus, S. epidermidis and, less commonly, E. faecalis. Conclusions. The use of PCR analysis to identify the causative agents of osteomyelitis and gene amplification using specific primers has a huge advantage over routine microbiological tests, being an informative method for studying the pathogenicity factors of the main pathogens. The high importance of molecular genetic methods in the study of the etiopathogenesis of osteomyelitis of the jaws requires their widespread use in the clinic of surgical dentistry and maxillofacial surgery to successfully solve complex problems in the rehabilitation of patients with this disease.

Antibacterial Activity Test of Ethanol Extract of Basil Leaves (Ocimum basilicum) Against Streptococcus mutans and Porphyromonas gingivalis

Basil leaves (Ocimum basilicum) is a type of plant used traditionally that has antibacterial potential. Antibacterial compounds are compounds that can inhibit the growth of bacteria. This study aims to obtain ethanol extract of basil leaves (Ocimum basilicum) to determine the activity and diameter of the largest inhibition zone against Streptococcus mutans and Porphyromonas gingivalis bacteria. This research was started by preparing a thick extract of basil leaves which was obtained by extracting basil leaves by maceration. Antibacterial screening test with concentrations of 0.1% and 0.5% against Streptococcus mutans and Porphyromonas gingivalis. The method used was agar diffusion with 6 concentrations in each treatment group of ethanol extract of basil leaves with concentrations of 0.5%, 1%, 5%, 10%, 15% and 30%. The results of the screening test gave activity at a concentration of 0.5% against the two test bacteria. The results of the antibacterial activity test of the ethanol extract of basil leaves against the test bacteria obtained the largest diameter of the inhibition zone at a concentration of 30%. Based on research, the ethanol extract of basil leaves has activity as an antibacterial.

In-vitro Evaluation of Wild Bitter Melon (Momordica charantia) Extracts against Periodontopathic Bacteria (Prevotella intermedia and Porphyromonas gingivalis) using Antibacterial, Anti-Inflammatory and Molecular Docking Analysis

ABSTRACT Wild bitter melon (Momordica charantia) extracts were prepared and their antibacterial and anti-biofilm assay were investigated against two different periodontopathic bacteria (Prevotella intermedia and Porphyromonas gingivalis) for the first time to the best of our knowledge based on the presence of different phytochemical compounds. Momordica charantia solvent extracts were prepared and phytochemical analysis was performed. Minimal inhibitory and bactericidal concentrations were determined. Antibacterial activity was evaluated using the standard well diffusion method. Anti-inflammatory studies on periodontal ligament (PDL) cell viability and lipopolysaccharide (LPS)-induced inflammation were performed. Molecular docking was investigated between the bioactive compound (Charantadiol A) of plant extract and biofilm-expressing genes in each test organism. Phytochemicals from ethanol extract showed promising results; alkaloids, flavonoids, phenols, and tannins were found present at considerable levels. The minimum inhibitory concentration was found to be 400 μg/mL for Prevotella intermedia and Porphyromonas gingivalis. Antibacterial activity expressed in terms of zone of inhibition showed 14 mm to 18 mm zones against the test organisms. The molecular docking report revealed the maximum binding energy of about −6.54 Kcal/Mol of binding energy between Charantadiol A and fimA of Porphyromonas gingivalis. Anti-biofilm study showed that the minimum biofilm eradication concentration (MBEC) of Momordica charantia expressed significantly good results against the test organisms. The PDL cell viability values expressed in percentage indicated the anti-inflammatory properties of Momordica charantia extracts at three different known concentrations. The findings concluded that Momordica charantia extracts have promising prospects as an anti-periodontopathic and anti-inflammatory agent.

Abstract 6696: Microbial signatures and serum markers in colon cancer of African American patients

Abstract Among all the racial/ethnic groups, African American (AA) patients have the highest incidence of CRC and mortality rate. There is growing evidence indicating that the oral bacteria might translocate to the intestine, potentially causing disruptions in the balance of gut microbes. Our study delves into the complex interplay between oral pathogens, gut microbiota, and colon carcinogenesis in AA patients. Methods: 16S rRNA sequencing of tumor and non-tumor tissues, utilized qPCR for detection of oral bacteria Fusobacterium nucleatum (Fn) and Porphyromonas gingivalis (Pg) relative abundance, performed cytokine profiling via multiplex ELISA, and employed NAPPA for antibody response assessment. Results: Colon tumor tissues had lower microbial diversity, notably in right-sided tumors, with distinct biofilm-associated bacteria. Novel discoveries emerged from differential abundance testing, revealing Prevotella intermedia and Treponema socranski to be associated with early cancer stage and left-sided location, and Fusobacterium necrophorum with advanced cancer stage and right-sided location. qPCR demonstrated Fn and Pg elevation in right-sided tumors and late cancer stages. Both were detected in 45% of tumors versus 37% in non-tumor tissues and 19.15% of tumors and 25.53% in non-tumor tissues, respectively. Fn-positive groups exhibited distinct microbial signatures, with altered bacterial abundances and dysbiosis, including increased CRC-associated bacteria Faecalibacterium and Helicobacter, increased oral pathogen abundance (Fusobacterium, Porphyromonas, Prevotella, Treponema), and reduced beneficial bacteria. Serological analysis highlighted elevated levels of IL-2, IL-10, IFN-γ, and RANK in advanced cancer stages and increased CRP levels in right-sided tumors. By NAPPA analysis, 30 bacterial proteins (anti-IgG) showed a seroprevalence of more than 15% in the samples, with those being the most seroprevalent anti-HP131 and anti-HP-1564 (68% and 61% of all samples) of Helicobacter pylori, and anti-msnK (64%) of Streptococcus gallolyticus. Conclusions: Our study emphasized the reduced diversity in tumor tissues, particularly in right-sided tumors in AA colon cancer. Fn presence in colonic tumors correlated with CRC-associated bacteria and oral pathogen aggregation, suggesting its potential role in cancer pathogenesis. Combining the analysis of cytokines and pathogenic bacteria antibodies may serve as broader serological biomarkers for disease severity and location. These findings advance our comprehension of microbiota-cancer interactions, directing personalized diagnostics and treatments in this population. Citation Format: Sofia Carolina Tortora, Emily Vogtmann, Laura Martello-Rooney. Microbial signatures and serum markers in colon cancer of African American patients [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2024; Part 1 (Regular Abstracts); 2024 Apr 5-10; San Diego, CA. Philadelphia (PA): AACR; Cancer Res 2024;84(6_Suppl):Abstract nr 6696.

Potential of 10% propolis-based toothpaste on the inhibition of biofilm-forming bacteria growth in vitro

Aim of the study: To investigate the potential of 10% propolis-based toothpaste on inhibiting biofilm-forming bacteria growth in vitro. Material and method: Organoleptic properties are evaluated, considering color, odor, and taste. Antibacterial tests use a disc diffusion method against Streptococcus mutans, Staphylococcus aureus and Porphyromonas gingivalis bacteria, while cytotoxicity is assessed using the 3-(4,5-dimethylthiazol-2-yl)-5-(3-carboxymethoxyphenyl)-2-(4-sulfophenyl)-2H-tetrazolium (MTS) assay on fibroblast cells. Statistical analysis involves mean ± standard deviation. The data were then tested using a one-way analysis of variance and Kruskal-Wallis, followed by post-hoc test (p &amp;lt; 0.05). Results: The organoleptic evaluation of 10% propolis toothpaste reveals a visually clear appearance, consistent orange flavor, and aroma lasting 30 days. Based on the antibacterial results, a 10% level of propolis toothpaste sample inhibited the growth of Streptococcus mutans, Staphylococcus aureus and Porphyromonas gingivalis bacteria. The post-hoc test showed that toothpaste demonstrated significant inhibition on S. mutans and S. aureus compared to the negative control (p &amp;lt; 0.05). The toothpaste showed a larger inhibitory zone towards P. gingivalis compared to the adverse control; however, no significant differences were observed (p &amp;gt; 0.05). Cytotoxicity assessment on fibroblast cells shows a high percentage (85.31%) of viable cells. The findings highlight the 10% of propolis toothpaste’s potential and non-toxic as oral care product. Conclusions: 10% propolis toothpaste inhibits S. mutans, S. aureus, P. gingivalis growth, and not toxic on fibroblast.

A pleiotropic role of sialidase in the pathogenicity of Porphyromonas gingivalis.

As one of the keystone pathogens of periodontitis, the oral bacterium Porphyromonas gingivalis produces an array of virulence factors, including a recently identified sialidase (PG0352). Our previous report involving loss-of-function studies indicated that PG0352 plays an important role in the pathophysiology of P. gingivalis. However, this report had not been corroborated by gain-of-function studies or substantiated in different P. gingivalis strains. To fill these gaps, herein we first confirm the role of PG0352 in cell surface structures (e.g., capsule) and serum resistance using P. gingivalis W83 strain through genetic complementation and then recapitulate these studies using P. gingivalis ATCC33277 strain. We further investigate the role of PG0352 and its counterpart (PGN1608) in ATCC33277 in cell growth, biofilm formation, neutrophil killing, cell invasion, and P. gingivalis-induced inflammation. Our results indicate that PG0352 and PGN1608 are implicated in P. gingivalis cell surface structures, hydrophobicity, biofilm formation, resistance to complement and neutrophil killing, and host immune responses. Possible molecular mechanisms involved are also discussed. In summary, this report underscores the importance of sialidases in the pathophysiology of P. gingivalis and opens an avenue to elucidate their underlying molecular mechanisms.

Antimicrobial Sensitivity Associated with Porphyromonas gingivalis Present in Periodontitis Frameworks: An Integrative Review

Objectives: The Gram-negative anaerobic bacterium Porphyromonas gingivalis is identified as one of the most important causes of the chronic form of periodontitis. This work aimed to analyze the sensitivity of P. gingivalis to antibiotics and antimicrobial agents.&#x0D; Study Design: Integrative literature review.&#x0D; Methodology: Through a careful analysis of clinical trials published in the last 5 years. A bibliographic search was carried out in the PubMed, Scielo and Google Scholar databases. Three keywords were established and verified on the DeCs-Descritores em Ciências da Saúde website for the literary search “Antimicrobial resistance”, “Periodontal biotherapy” and “Porphyromonas gingivalis”. 66 articles were found. Of these, animal studies, studies that did not involve patients diagnosed with periodontitis according to the 2017 World Workshop on the Classification of Periodontal and Peri-implant Diseases and Conditions, and studies on peri-implantitis were excluded. Studies that used only surgical therapy without association with at least one antibiotic or antimicrobial and duplicate studies were excluded.&#x0D; Results: This integrative review presents the results of 19 studies. Amoxicillin, Metronidazole and Azithromycin are the most commonly used antibiotics. Photodynamic therapy has demonstrated benefits in reducing inflammation and P. gingivalis counts. It has been demonstrated that P. gingivalis is not sensitive to Lactobacillus brevis and Lactobacillus plantarum-ProlcSan probiotic gel and tablets, as no reductions in its proportion and total count were observed. Similar results were also observed in the study that investigated the effect of administering piperacillin plus Tazobactam gel and doxycycline gel.&#x0D; Conclusion: Although most of the articles presented report the sensitivity of P. gingivalis to their protocols, microbiological reduction is not always accompanied by clinical benefit, since periodontal disease is multifactorial. Based on these findings, it is concluded that there are several antimicrobial agents capable of promoting the reduction of this key pathogen in periodontitis.

MMP-7 Levels Decrease in Gingival Epithelium Exposed to Porphyromonas Gingivalis after Curcumin administration

Periodontitis is an irreversible inflammatory disease of the periodontal tissues. The leading cause of periodontitis is Porphyromonas gingivalis bacteria, which secretes virulence factors, namelyLipopolysaccharide (LPS) and proteases, which cause the inflammation of gingival junctional epithelium and loss of attachment, resulting in the formation of a periodontal pocket. The most common type of MMP found in the junctional epithelium is MMP-7. Invasion of Porphyromonas gingivalis bacteria causes an increase in proteolytic activity on the expression and activation of MMP-7, which causes loss of attachment. Efficacious plant extracts, namely irrigated curcumin 1%, have an anti-inflammatory effect. This research is independent research using experimental white rats (Rattus norvegicus) male strain Wistar, 20 weeks old, with a body weight of 325-350 grams. This research is to see the levels of MMP-7 with the ELISA method. Forty-eight periodontitis model rats were divided into two groups. Twenty-four periodontitis model rats as the control group were exposed to Porphyromonas gingivalis, and another twenty-four periodontitis model rats as the treatment group were exposed to Porphyromonas gingivalis and 1% curcumin irrigation. Each group was observed at 24 hours, on days-7 and days-14. The results showed that MMP-7 levels in the treatment group were significantly lower than in the control group on on days-7 and days-14. In the treatment group, MMP-7 levels at 24 hours were significantly lower than on the on days-7 and days-14. In the treatment group, MMP-7 levels did not experience a significant difference between the on days-7 and days-14. The results of this study indicate that 1% curcumin can reduce MMP-7 levels in cases of chronic periodontitis due to Porphyromonas gingivalis bacteria.

Oral bacteria accelerate pancreatic cancer development in mice

ObjectiveEpidemiological studies highlight an association between pancreatic ductal adenocarcinoma (PDAC) and oral carriage of the anaerobic bacterium Porphyromonas gingivalis, a species highly linked to periodontal disease. We analysed the potential...

Antibacterial Activity of Andaliman Ethanol Extract (Zantoxylum Acanthopodium Dc.) Against Porphyromonas Gingivalis Bacteria

Periodontitis is a destructive inflammatory disease of the supporting tissues of the teeth that causes further damage to the periodontal ligament, alveolar bone to the formation of pockets, and decreased gums caused by the bacterium Porphyromonas gingivalis. The most common and frequent periodontal disease is chronic periodontitis which is caused by the accumulation of plaque and calculus. Alternative treatment using herbal ingredients such as andaliman fruit (Zantoxylum acanthopodium DC.) has therapeutic benefits because of its broad biological activity, and lower side effects. Andaliman fruit (Zantoxylum acanthopodium DC.) contains active compounds such as phenolic compounds, saponins, flavonoids, tannins, triterpenoids, steroids, and alkaloids that act as antibacterial. The aim of this study was to determine the minimum inhibitory level (MIC) and minimum killing rate (MBC) of andaliman fruit ethanol extract against Porphyromonas gingivalis bacteria. The research procedure used for the MIC and MBC tests was broth microdilution and the number of colonies was counted using the total plate count (TPC) with variations of 6 concentrations of andaliman fruit ethanol extract with 10% DMSO solvent and 0.2% Chlorhexidine. Statistical analysis in this study was performed using Levene Statistics and Post Hoc Dunnet T3. The ethanol extract of andaliman fruit has a minimum inhibitory concentration (MIC) and a minimum killing concentration (MBC) against the growth of Porphyromonas gingivalis bacteria. The minimum inhibitory concentration in the ethanol extract of andaliman fruit was at a concentration of 25%, while the minimum killing concentration was at a concentration of 100%.

The role of the biofilm of Porphyromonas gingivalis in driving amyloid beta secretion and aggregation

AbstractBackgroundOver the past five years, the hypothesis linking periodontitis to Alzheimer’s disease (AD) has gained significant traction even though little is known about the underlying mechanisms driving this association. Periodontitis is caused by the dysbiosis of the dental biofilm, an extra‐cellular matrix produced by bacteria, which is mostly caused by the Gram‐negative bacterium Porphyromonas gingivalis. P. gingivalis has been found to infect the brain of AD patients and drive amyloid beta (Aβ) production while biofilm components can be identified interwoven with Aβ plaques1,2. We therefore hypothesize that P. gingivalis drives Aβ production in neural cells which co‐aggregates with bacterial biofilm to expedite plaque formation and downstream neuroinflammation.MethodTo assess if the biofilm of co‐aggregation of Aβ and the matrix was then analyzed by fluorescence microscopy, atomic force microscopy (AFM) and thioflavin T (ThT) fluorescence assays. To examine whether P. gingivalis stimulates Aβ production, we infected BE(2)‐M17 human neuroblastomas at a mean of infection of 1:100 before collecting cells and supernatant proteins to observe the cell response through protein and transcription assays.ResultsWhen co‐cultured, P. gingivalis and Aβ1‐42 co‐aggregated in plaque‐like structures, Interestingly, colocalization analysis revealed that Aβ1‐42 particularly associate with the extracellular component of biofilm (Figure 1). ThT assays and AFM imaging demonstrated faster aggregation of Aβ1‐42 when co‐incubated with fragments of P. gingivalis biofilm for 8 h, which suggests a significant cross‐seeding phenomenon between the two components (Figure 2). Furthermore, infection of human neuroblastomas resulted in a significant increase in Aβ production that could be detected by western blot, thus offering a workable model to study the link between AD and periodontitis (Figure 3).ConclusionOur project offers significant insights into the relationship between periodontitis and AD, allowing us to understand how P. gingivalis triggers Aβ production and how its biofilm drives plaque aggregation. This research greatly contributes to a better understanding of external AD risk factors and how to mediate their impacts on neurodegeneration. 1Dominy et al. Science Advances (2019) 2Mirzaei et al. Microbial Pathogenesis (2020)

Determination of the inhibitory activity of some plant extracts against the obligate anaerobic bacteria Porphyromonas gingivalis that causes dental caries.

The study included 147 oral swabs collected from dental caries patients between October 2020 and January 2021. The culture results on the isolation medium showed that 73 samples, 49.7% of the total samples, showed positive growth, while 74 samples or 50.3%, showed no bacterial growth. p . gingivalis isolates produced hemolysin and biofilm formation by 100%. Their ability to produce B-lactamase was decreased, and the percentage of isolates produced was 42.5%, and the percentage of protease-producing isolates was 20.5%. As for the enzyme lipase and urease, all isolates could not produce them. The results showed that all bacterial isolates were resistant to all the antibiotics used, namely Piperacillin - Ciprofloxacin - Levofloxacin - Carbenicillin - oxytetracycline - Azithromycin - Meropene - Norfloxacin at 0%, 0%, 60.3%, 100%, 0%, 60.3%, 60.3%, 9.6%, respectively. Extracts of cloves, pomegranate peel and miswak (aqueous and alcoholic) were used at four concentrations of 75, 100, 150 and 200 mg/ml, and they showed different inhibitory activities against the studied bacteria depending on the concentration. 200 mg/ml is among the most effective inhibitors, especially alcoholic extracts. For these plants, the alcoholic extracts of pomegranate peel, cloves and toothpicks recorded the highest inhibitory activity, with 52, 48 and 25 mm diameters, respectively. The lowest inhibitory activity of the alcohol extract was a concentration of 75 mg, and the highest inhibitory activity was observed against pomegranate peels with a diameter of 25 mm cloves and toothpicks with a diameter of 22 and 8 mm, respectively. Keywords: Porphyromonas gingivalis, Multidrug resistance, inhibition activity, Plant extraction, virulence factors

Functional and structural analyses reveal that a dual domain sialidase protects bacteria from complement killing through desialylation of complement factors.

The complement system is the first line of innate immune defense against microbial infections. To survive in humans and cause infections, bacterial pathogens have developed sophisticated mechanisms to subvert the complement-mediated bactericidal activity. There are reports that sialidases, also known as neuraminidases, are implicated in bacterial complement resistance; however, its underlying molecular mechanism remains elusive. Several complement proteins (e.g., C1q, C4, and C5) and regulators (e.g., factor H and C4bp) are modified by various sialoglycans (glycans with terminal sialic acids), which are essential for their functions. This report provides both functional and structural evidence that bacterial sialidases can disarm the complement system via desialylating key complement proteins and regulators. The oral bacterium Porphyromonas gingivalis, a "keystone" pathogen of periodontitis, produces a dual domain sialidase (PG0352). Biochemical analyses reveal that PG0352 can desialylate human serum and complement factors and thus protect bacteria from serum killing. Structural analyses show that PG0352 contains a N-terminal carbohydrate-binding module (CBM) and a C-terminal sialidase domain that exhibits a canonical six-bladed β-propeller sialidase fold with each blade composed of 3-4 antiparallel β-strands. Follow-up functional studies show that PG0352 forms monomers and is active in a broad range of pH. While PG0352 can remove both N-acetylneuraminic acid (Neu5Ac) and N-glycolyl-neuraminic acid (Neu5Gc), it has a higher affinity to Neu5Ac, the most abundant sialic acid in humans. Structural and functional analyses further demonstrate that the CBM binds to carbohydrates and serum glycoproteins. The results shown in this report provide new insights into understanding the role of sialidases in bacterial virulence and open a new avenue to investigate the molecular mechanisms of bacterial complement resistance.

Efek Antibakteri Ekstrak Buah Kurma Ajwa (Phoenix Dactylifera L) Terhadap Bakteri Porphyromonas Gingivalis

One of the main problems in society is dental and oral health so that people need intensive care. Dental and oral conditions which are a serious problem in Indonesia are caused by caries and periodontal disease. Periodontal disease is a disease caused by bacteria and plaque found in the supporting tissues of the teeth. Gingivitis is the first stage of periodontal disease, which can progress to periodontitis. The dominant bacteria found in periodontal disease conditions are Porphyromonas gingivalis and A. actinomycetemcomitans. Porphyromonas gingivalis is an anaerobic gram-negative bacterium that is often found in subgingival plaque. Porphyromonas gingivalis plays an important role in the etiology of advanced periodontal disease and is found in more than 90% of the subgingival flora of patients diagnosed with 'adult periodontitis'. Dates or Phoenix dactylifera are known as healthy foods for a long time, because they have very high tannins and are used in medicine. One of the benefits is its ability to inhibit the growth of bacteria in the oral cavity. Ajwa dates have a sweet taste, soft fruit texture, and dark color. Although Ajwa dates are more expensive than other varieties, they are clearly superior in terms of content and texture when compared to other thin-skinned dates. Research objective: To determine the growth of Porphyromonas gingivalis bacteria resulting from the antibacterial effect of ajwa date fruit extract. Methods and Materials: This study used an in vitro experimental test using the disk diffusion technique with the type of post test only control design. The statistical test used is the Analysis of Variance (ANOVA) test. The sample in this study consisted of 24 samples. Results: Based on the results of the Analysis of Variance (ANOVA) test, the p-value showed a value of 0.000 or a p-value less than 0.05. This means that there is a significant difference between the treatment of ajwa dates 50%, 70%, 100% with the control group. Conclusion: Based on the results of this study, it is explained that ajwa date extract (Phoenix dactylifera l) with a concentration of 50%, 70%, 100% can inhibit Porphyromonas gingivalis bacteria.

Evaluation of the periodontal and microbiological conditions of obese patients submitted to bariatric surgery

This article seeks to identify the periodontal and microbiological conditions of obese individuals undergoing bariatric surgery. The focus on obese patients is due to obesity being a growing public health problem, which is increasing in important epidemic proportions all over the world. Thus, this is a cross-sectional study with a qualitative approach, in an Intensive Care Unit (ICU) from March to October 2018, with 25 obese patients who proposed to participate in the research. The periodontal situation was identified as: periodontal health, gingivitis and periodontitis. In the microbiological examination, the bacteria Aggregatibacter actinomycetemcomitans (AA), Porphyromonas gingivalis (PG), Streptococcus oralis (SO) and Universal (UN) were identified and quantified using real-time PCR. There was a statistically significant difference (p &gt; 0.05) between the degrees of obesity in terms of gingivitis and periodontitis. The (AA) presented statistically significant difference (p &lt; 0.05) in the situation of gingivitis and periodontal health. It can be concluded that (AA) had a higher average amount in obese individuals, even in the situation of periodontal health and PG lower amount in gingivitis and higher in periodontitis. There was a prevalence of (AA) and (PG) in the supragingival location, and prevalence of (AA), (PG) and (SO) in the subgingival location.

Periodontopathogens Porphyromonas gingivalis and Fusobacterium nucleatum and Their Roles in the Progression of Respiratory Diseases.

The intricate interplay between oral microbiota and the human host extends beyond the confines of the oral cavity, profoundly impacting the general health status. Both periodontal diseases and respiratory diseases show high prevalence worldwide and have a marked influence on the quality of life for the patients. Accumulating studies are establishing a compelling association between periodontal diseases and respiratory diseases. Here, in this review, we specifically focus on the key periodontal pathogenic bacteria Porphyromonas gingivalis and Fusobacterium nucleatum and dissect their roles in the onset and course of respiratory diseases, mainly pneumonia, chronic obstructive pulmonary disease, lung cancer, and asthma. The mechanistic underpinnings and molecular processes on how P. gingivalis and F. nucleatum contribute to the progression of related respiratory diseases are further summarized and analyzed, including: induction of mucus hypersecretion and chronic airway inflammation; cytotoxic effects to disrupt the morphology and function of respiratory epithelial cells; synergistic pathogenic effects with respiratory pathogens like Streptococcus pneumoniae and Pseudomonas aeruginosa. By delving into the complex relationship to periodontal diseases and periodontopathogens, this review helps unearth novel insights into the etiopathogenesis of respiratory diseases and inspires the development of potential therapeutic avenues and preventive strategies.

Antibacterial Effectiveness Test of Water Hyacinth Leaf Extract (Eichhornia Crassipes) Against the Growth of Porphyromonas gingivalis Bacteria

The water hyacinth plant is proven to have medicinal properties because it has antibacterial properties in the form of flavanoids, tannins and alkaloids. Purpose to test the antibacterial effectiveness of water hyacinth leaf extract against the growth of Porphyromonas gingivalis bacteria. The type of research used is the test method was disc diffusion. The samples were divided into 4 groups each given a concentration of 7.25%, 15%, 30%, 50%, positive control (Chlorhexidine gluconate 0.2%), and negative control (aquades). Result there were inhibition zones at concentrations of 7.25%, 15%, 30%, 50% water hyacinth leaf extract. The One Way Anova test showed p &lt;0.05, which means that there was a difference in each treatment. In conclusion, water hyacinth leaves (Eichhornia crassipes) can inhibit the growth of Porphyromonas gingivalis bacteria with the greatest inhibitory ability at a concentration of 50%, namely 6.2 mm, which is included in the medium inhibition zone category.

Antibacterial Effect of Black Ethanol Extract (Camellia sinensis) on The Growth of Porphyromonas gingivalis Bacteria

Background: Chronic periodontitis is one of the inflammatory diseases in the oral cavity that can cause damage to the structure of the supporting tissues of the teeth. The bacterium Porphyromonas gingivalis is the cause of chronic periodontitis which has specific virulence factors that produce lipopolysaccharides by destroying the host cell wall mechanism. Black tea with the Latin name Camellia sinensis contains theaflavins with antibacterial effects. Materials and methods: This study was an in vitro experimental laboratory study with disc diffusion method (Kirby Bauer), minimum inhibitory concentration (MIC), and minimum bactericidal concentration (MBC). The samples of this study were black tea ethanol extract with a concentration of 10%, 20%, 40%, 60%, 80%, and 100% with positive control group is chlorhexidine 0,2%, and negative control group is BHI broth, which tested Porphyromonas gingivalis. The Kruskal Wallis test results showed that there were statistically significant differences between the diameter of the bacterial inhibitory zone produced from the concentration group of black tea ethanol extract (7 mm), 40% (8,6 mm), 60% (10 mm), 80% (10,6 mm), and 100% (11,2 mm) (P &lt;0.05). The Spearman correlation test results (r=0.431) showed a positive correlation with moderate strength between an increase in the concentration of black tea ethanol extract to the diameter of the bacterial inhibitory zone. Result: The MIC value in this study is 10% and the result of MBC is 20%. Conclusion: the ethanol extract of black tea has an antibacterial effect on Porphyromonas gingivalis. There is an increase in inhibition zone diameter along with an increase in the concentration of black tea extract, which indicates black tea ethanol extract has concentration-dependent antibacterial properties.