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Journal of Periodontal Research Oct 2023To investigate the existence of any association between new putative periodontal pathogens and periodontitis. Two independent reviewers conducted electronic literature... (Meta-Analysis)
Meta-Analysis Review
To investigate the existence of any association between new putative periodontal pathogens and periodontitis. Two independent reviewers conducted electronic literature searches in the MEDLINE (PubMed), EMBASE, DOSS and Google Scholar databases as well as a manual search to identify eligible clinical studies prior to November 2022. Studies comparing the prevalence of microorganisms other than the already-known periodontal pathogens in subgingival plaque and/or saliva samples between subjects with periodontitis and subject with periodontal health were included. Meta-analyses were performed on data provided by the included studies. Fifty studies including a total of 2739 periodontitis subjects and 1747 subjects with periodontal health were included. The Archaea domain and 25 bacterial species (Anaeroglobus geminatus, Bacteroidales [G-2] bacterium HMT 274, Desulfobulbus sp. HMT 041, Dialister invisus, Dialister pneumosintes, Eubacterium brachy, Enterococcus faecalis, Eubacterium nodatum, Eubacterium saphenum, Filifactor alocis, Fretibacterium sp. HMT 360, Fretibacterium sp. HMT 362, Mogibacterium timidum, Peptoniphilaceae sp. HMT 113, Peptostreptococcus stomatis, Porphyromonas endodontalis, Slackia exigua, Streptococcus gordonii, Selenomonas sputigena, Treponema amylovorum, Treponema lecithinolyticum, Treponema maltophilum, Treponema medium, Treponema parvum and Treponema socranskii) were found to be statistically significantly associated with periodontitis. Network studies should be conducted to investigate the role of these newly identified periodontitis-associated microorganisms through interspecies interaction and host-microbe crosstalk analyses.
Topics: Humans; Bacteria; Periodontitis; Dental Plaque; Bacteroides; Eubacterium
PubMed: 37572051
DOI: 10.1111/jre.13173 -
Head & Neck Aug 2023The relationship between head and neck squamous cell carcinoma (HNSCC) and the oral microbiome has been drawn in various studies. Microbial diversities, microbiome... (Review)
Review
OBJECTIVES
The relationship between head and neck squamous cell carcinoma (HNSCC) and the oral microbiome has been drawn in various studies. Microbial diversities, microbiome profiles, metagenomic analysis, and host-pathogen interactions were collected from these studies to highlight similarities and account for inconsistencies. We also evaluate the possible clinical applications of the microbiome regarding screening and diagnosis of HNSCC.
METHODS
Systematic analysis of studies regarding HNSCC and the microbiome was done according to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) statement guidelines. Articles were retrieved from four databases (PubMed, ScienceDirect, CUHK Full-Text Journals, and Cochrane database) and were screened using predefined criteria.
RESULTS
Twenty studies were chosen after screening for full-text review. α-diversity comparison was inconsistent whereas β-diversity between HNSCC and normal samples showed distinct clustering. Microbial dysbiosis characterized by change in the relative abundances of several bacterial species were also seen in HNSCC patients. At a phylum level, inconsistencies were seen between studies using HNSCC tumor tissue samples and saliva samples. At a genus level, Fusobacterium, Peptostreptococcus, Alloprevotella, Capnocytophaga, Catonella, and Prevotella were differentially enriched in HNSCC while Streptococcus, Actinomyces Veillonella, and Rothia were differentially depleted. Co-occurrence network analysis revealed a positive correlation of HNSCC with periodontal pathogens and a negative correlation with commensal bacteria. Metagenomic analysis of microbiota revealed a differential enrichment of pro-inflammatory genomic pathways which was consistent across various studies. Microbial dysbiosis was applied in clinical use as a tool for HNSCC screening. Random-forest analysis was adopted to differentiate between tumor and normal tissue, at 95.7% and 70.0% accuracies respectively in two studies. Microbial dysbiosis index was also used to predict prognosis.
CONCLUSIONS
Oral microbial dysbiosis could be a promising tool for HNSCC screening and diagnosis. However, more research should be conducted pertaining to clinical applications to improve diagnostic accuracy and explore other clinical uses.
Topics: Humans; Bacteria; Dysbiosis; Head and Neck Neoplasms; Microbiota; Squamous Cell Carcinoma of Head and Neck
PubMed: 37249085
DOI: 10.1002/hed.27422 -
Microbiome Dec 2022The gut microbiome promotes specific immune responses, and in turn, the immune system has a hand in shaping the microbiome. Cancer and autoimmune diseases are two major... (Meta-Analysis)
Meta-Analysis
BACKGROUND
The gut microbiome promotes specific immune responses, and in turn, the immune system has a hand in shaping the microbiome. Cancer and autoimmune diseases are two major disease families that result from the contrasting manifestations of immune dysfunction. We hypothesized that the opposing immunological profiles between cancer and autoimmunity yield analogously inverted gut microbiome signatures. To test this, we conducted a systematic review and meta-analysis on gut microbiome signatures and their directionality in cancers and autoimmune conditions.
METHODOLOGY
We searched PubMed, Web of Science, and Embase to identify relevant articles to be included in this study. The study was conducted in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) statements and PRISMA 2009 checklist. Study estimates were pooled by a generic inverse variance random-effects meta-analysis model. The relative abundance of microbiome features was converted to log fold change, and the standard error was calculated from the p-values, sample size, and fold change.
RESULTS
We screened 3874 potentially relevant publications. A total of 82 eligible studies comprising 37 autoimmune and 45 cancer studies with 4208 healthy human controls and 5957 disease cases from 27 countries were included in this study. We identified a set of microbiome features that show consistent, opposite directionality between cancers and autoimmune diseases in multiple studies. Fusobacterium and Peptostreptococcus were the most consistently increased genera among the cancer cases which were found to be associated in a remarkable 13 (+0.5 log fold change in 5 studies) and 11 studies (+3.6 log fold change in 5 studies), respectively. Conversely, Bacteroides was the most prominent genus, which was found to be increased in 12 autoimmune studies (+0.2 log fold change in 6 studies) and decreased in six cancer studies (-0.3 log fold change in 4 studies). Sulfur-metabolism pathways were found to be the most frequent pathways among the member of cancer-increased genus and species.
CONCLUSIONS
The surprising reproducibility of these associations across studies and geographies suggests a shared underlying mechanism shaping the microbiome across cancers and autoimmune diseases. Video Abstract.
Topics: Humans; Reproducibility of Results; Autoimmune Diseases; Neoplasms
PubMed: 36482486
DOI: 10.1186/s40168-022-01373-1 -
Journal of Clinical and Experimental... Oct 2022Patients with odontogenic infections are commonly prescribed antimicrobials on an experiential base without knowing the precise microorganisms implicated. The aim of... (Review)
Review
BACKGROUND
Patients with odontogenic infections are commonly prescribed antimicrobials on an experiential base without knowing the precise microorganisms implicated. The aim of this systematic scoping review is to evaluate the prevalence and proportions of antimicrobial-resistant species in patients with odontogenic infections.
MATERIAL AND METHODS
A systematic scoping review of scientific evidence was accomplished involving different databases.
RESULTS
Eight randomized clinical trials and 13 prospective observational studies were included. These investigations analyzed 1506 patients. The species that showed higher levels of resistance included aerobic and facultative anaerobe such as , and . In obligate anaerobes sampled were Peptostreptococcos spp., Bacteroides spp., and Prevotella spp. Staphylococcus showed resistance to ampicillin, piperacillin, clindamycin, amoxicillin, metronidazole, and penicillin. Streptococcus had resistance to metronidazole, clindamycin, doxycycline, penicillin, and amoxicillin. Peptostreptococcus spp. presented resistance to penicillin, amoxicillin, erythromycin, and cefalexin. Gram-negative microorganisms had resistance to tetracycline, ciprofloxacin, azithromycin, amoxicillin, erythromycin, and penicillin. Bacteroides spp. exhibited resistance to penicillin, erythromycin, and gentamicin. Prevotella spp. showed resistance to penicillin, amoxicillin, erythromycin, clindamycin, levofloxacin, and imipenem. Finally, Klebsiella spp. displayed resistance to ampicillin, amoxicillin, moxifloxacin, and cefalexin. Interestingly, one clinical trial showed that after therapy there was a reduction in sensitivity of 18% for azithromycin and 26% for spiramycin.
CONCLUSIONS
Most of the microorganisms had resistance to diverse groups of antimicrobials. Suitable antimicrobials must be prescribed founded on the microbial samples, culture susceptibility, and clinical progression of the odontogenic infection. Furthermore, it was observed high levels of resistance to antimicrobials that have been used in local and systemic therapy of oral cavity infections. A preponderance of anaerobic microorganisms over aerobic ones was observed. Antibiotic resistance, odontogenic infections, efficacy, microorganisms, scoping review.
PubMed: 36320675
DOI: 10.4317/jced.59830 -
Journal of the Turkish German... Sep 2020Accumulating evidence indicates the potential correlation between the vaginal microbioma and the acquisition and persistence of human papillomavirus (HPV) infection....
Accumulating evidence indicates the potential correlation between the vaginal microbioma and the acquisition and persistence of human papillomavirus (HPV) infection. This study aims to demonstrate the potential relationship through a systematic review of the current literature. A search was conducted on the following medical databases: PubMed and Scopus. Nineteen studies met the inclusion criteria and were incorporated in the present review. A total of 12.204 patients and their demographic characteristics were studied. Commercially available DNA tests and polymerase chain reaction (PCR) were used for the detection of different HPV subtypes, while the identification of the microbiomes was performed through specific diagnostic methods and PCR assay. The most frequently encountered species were classified based on their protective or detrimental impact on the progression of HPV infection. The beneficial role of some types of is generally supported. On the other hand, high microbial diversity and specific microorganisms such as and were found to be implicated with higher frequency and severity of disease, potentially resulting in pre-cancerous and cancerous cervical lesions.The role of vaginal microbiota appears to play an as yet not fully understood role in the susceptibility to HPV infection and its natural history.
PubMed: 31564082
DOI: 10.4274/jtgga.galenos.2019.2019.0051 -
Journal of Periodontal Research May 2024This systematic review aims to investigate the microbial basis underlying the association between oral microbiota and colorectal cancer. A comprehensive search was... (Review)
Review
This systematic review aims to investigate the microbial basis underlying the association between oral microbiota and colorectal cancer. A comprehensive search was conducted across four databases, encompassing potentially relevant studies published up to April 2024 related to the PECO question: "Is there a differentiation in oral microbial composition between adult patients diagnosed with colorectal cancer compared to healthy patients?". The Newcastle-Ottawa Scale was used to evaluate the quality of the studies included. The level of evidence was assessed through the GRADE (Grading of Recommendations, Assessment, Development and Evaluation) tool. Sixteen studies fulfilled the eligibility criteria. Based on low to moderate evidence profile, high levels of certain subspecies within Firmicutes (such as Streptococcus anginosus, Peptostreptococcus stomatis, S. koreensis, and S. gallolyticus), Prevotella intermedia, Fusobacterium nucleatum, and Neisseria oralis were found to be associated with colorectal cancer. Conversely, certain bacteria (e.g., Lachnospiraceae, F. periodonticum, and P. melaninogenica) could exert a symbiotic protective effect against colorectal cancer. Based on existing evidence, it appears that variations in oral microbiota composition exist among individuals with and without colorectal cancer. However, further research is necessary to determine the mechanisms of oral dysbiosis in colorectal carcinogenesis.
PubMed: 38775019
DOI: 10.1111/jre.13289 -
Frontiers in Oncology 2022Emerging evidence has demonstrated a close association between perturbations in vaginal microbiota composition in women and human papillomavirus (HPV) infection,...
BACKGROUND
Emerging evidence has demonstrated a close association between perturbations in vaginal microbiota composition in women and human papillomavirus (HPV) infection, cervical lesions, and cervical cancer (Ca); however, these findings are highly heterogeneous and inconclusive.
AIM
To perform a comprehensive systematic review of the global disturbance in the vaginal microbiota, specifically in women with HPV-associated cervical diseases, and to further conduct within- and across-disease comparisons.
METHOD
Twenty-two records were identified in a systematic literature search of PubMed, Web of Science, and Embase up to February 28, 2022. We extracted microbial changes at the community (alpha and beta diversity) and taxonomic (relative abundance) levels. Within- and across-disease findings on the relative abundance of taxonomic assignments were qualitatively synthesized.
RESULTS
Generally, significantly higher alpha diversity was observed for HPV infection, cervical lesions, and/or cancer patients than in controls, and significant differences within beta diversity were observed for the overall microbial composition across samples. In within-disease comparisons, the genera , , , , and showed the greatest abundances with HPV infection; and showed inconsistent abundance with HPV infection, and was observed in Ca. Across diseases, we find increased levels of and varying levels of were shared across HPV infections, high-grade squamous intraepithelial lesions, and Ca, whereas varied depending on the HPV-related disease subtype.
CONCLUSIONS
This systematic review reports that vaginal microbiome disturbances are correlated to the depletion of , enrichment of anaerobes, and increased abundance of aerobic bacteria in HPV infection and related cervical diseases. Moreover, may exert either protective or pathogenic effects on different HPV-related diseases.
PubMed: 35903684
DOI: 10.3389/fonc.2022.941741 -
Journal of Clinical Neuroscience :... May 2015Brain abscesses are rare but potentially deadly complications of odontogenic infections. This phenomenon has been described mainly in the form of case reports, as... (Review)
Review
Brain abscesses are rare but potentially deadly complications of odontogenic infections. This phenomenon has been described mainly in the form of case reports, as large-scale studies are difficult to perform. We compiled a total of 60 previously published cases of such a complication to investigate the predisposing factors, microbiology, and clinical outcomes of intracranial abscesses of odontogenic origin. A systematic review of the literature using the PubMed database was performed. Men accounted for 82.1% of cases, and the mean age was 42.1 years. Caries with periapical involvement and periodontitis were the two most common intra-oral sources, and wisdom tooth extraction was the most common preceding dental procedure. In 56.4% of cases, there were obvious signs of dental disease prior to development of intracranial infection. Commonly implicated microorganisms included Streptococcus viridans (especially the anginosus group), Actinomyces, Peptostreptococcus, Prevotella, Fusobacterium, Aggregatibacter actinomycetemcomitans and Eikenella corrodens. There was an 8.3% mortality rate. Intracranial abscesses can form anywhere within the brain, and appear unrelated to the side of dental involvement. This suggests that hematogenous spread is the most likely route of dissemination.
Topics: Bacterial Infections; Body Piercing; Brain Abscess; Humans; Mouth Mucosa; Peptostreptococcus; Tooth Extraction
PubMed: 25800939
DOI: 10.1016/j.jocn.2014.11.015 -
Clinical Laboratory May 2023No systematic review/meta-analysis has been conducted on the microbiological profile associated with the occurrence of periodontitis in patients with HIV. The aim of... (Meta-Analysis)
Meta-Analysis Review
BACKGROUND
No systematic review/meta-analysis has been conducted on the microbiological profile associated with the occurrence of periodontitis in patients with HIV. The aim of this study was to evaluate the prevalence of identified bacteria in HIV-infected patients with periodontal disease.
METHODS
Three English electronic databases (MEDLINE (via PubMed), SCOPUS, and Web of Science) were searched systematically from the beginning to February 13, 2021. The frequency of each identified bacteria in HIV-infected patients with periodontal disease was extracted. All meta-analysis methods were performed using STATA software.
RESULTS
Twenty-two articles met inclusion criteria and were enrolled into the systematic review. This review analyzed a total of 965 HIV-infected patients with periodontitis. The prevalence of periodontitis was higher in HIV-infected male patients (83% (CI 95%: 76 - 88%)) compared to females (28% (CI 95%: 17 - 39%)). In our study, the pooled prevalence of necrotizing ulcerative periodontitis and necrotizing ulcerative gingivitis in patients with HIV infection was 67% (CI 95%: 52 - 82%) and 60% (CI 95%: 45 - 74%), while a lower prevalence of linear gingivitis erythema was reported (11% (CI 95%: 5 - 18%)). More than 140 bacterial species were identified from HIV-infected patients with periodontal disease. High prevalence of Tannerella forsythia (51% (CI 95%: 5 - 96%)), Fusobacterium nucleatum (50% (CI 95%: 21 - 78%)), Prevotella intermedia (50% (CI 95%: 32 - 68%)), Peptostreptococcus micros (44% (CI 95%: 25 - 65%)), Campylobacter rectus (35% (CI 95%: 25 - 45%)), and Fusobacterium spp. (35% (CI 95%: 3 - 78%)) in HIV-infected patients with periodontal disease was found.
CONCLUSIONS
Our study demonstrated that the prevalence of the red and orange complex of bacteria in HIV patients with periodontal disease is relatively high.
Topics: Female; Humans; Male; HIV Infections; Porphyromonas gingivalis; Periodontal Diseases; Periodontitis; Gingivitis
PubMed: 37145081
DOI: 10.7754/Clin.Lab.2022.220738 -
Cureus Oct 2022Deaths from colorectal cancer (CRC) are still rising, and various links to etiology have been proposed. However, a direct link between microbial dysbiosis and colorectal... (Review)
Review
Deaths from colorectal cancer (CRC) are still rising, and various links to etiology have been proposed. However, a direct link between microbial dysbiosis and colorectal cancer has not been postulated. This study aimed to identify the role of microbes in the pathogenesis of colorectal cancer. This systematic review was based on the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines. A systematic search was done considering papers published over the past 12 years, using PubMed, PubMed Central, Cochrane, Google Scholar, and ScienceDirect databases. Studies were selected based on the following predefined eligibility criteria: English-language systematic reviews, meta-analysis, randomized controlled trials (RCTs), and clinical trials, which included papers on microbes playing roles in colorectal cancer with the derived data transferred to a template. Following this, quality assessment was done using each study's relevant assessment tool. The initial search generated 128 studies. From the study, we found the ratio of , when compared between healthy and colorectal cancer patients' guts, was the highest, although it was not the most predominant gut organism. Enterotoxigenic (ETBF), and , and showed links with colorectal cancer and described pathways that could explain its implication in colorectal cancer. However, overt conclusions cannot be drawn because further research needs to be conducted.
PubMed: 36465770
DOI: 10.7759/cureus.30893