ABSTRACT
Neisseria sicca, a Gram-negative diplococcus commonly found in the nasopharynx as part of normal bacterial flora, is typically non-pathogenic but has been associated with various diseases including endocarditis, conjunctivitis, pneumonia and meningitis (Jeurissen et al., 2006; Kozlova et al., 2020; Alcid, 1980; Carter et al., 2007). In this report, we present a case of peritonitis in a patient undergoing peritoneal dialysis caused by N. sicca and review the literature on Neisseria-associated peritonitis.
Subject(s)
Anti-Bacterial Agents , Neisseria sicca , Peritoneal Dialysis , Peritonitis , Humans , Peritonitis/microbiology , Peritonitis/drug therapy , Peritonitis/diagnosis , Peritoneal Dialysis/adverse effects , Anti-Bacterial Agents/therapeutic use , Neisseria sicca/genetics , Neisseriaceae Infections/microbiology , Neisseriaceae Infections/diagnosis , Male , Middle Aged , FemaleABSTRACT
Epidemiological data have shown that periodontal bacterial infection, periodontitis, and oral squamous cell carcinoma have close relationship on the disease progress and risk. However, the specific role of periodontal microbes and their mechanism in the development of oral squamous cell carcinoma is not yet clear. In our previous work, metagenomic Illumina Mi-seq analysis was used to identify tstructure and abundance of periodontital microbiome. Accoding to the results, we used Porphyromonas.spp. and Fusobacterium.spp. as the periodontitis positive microbiota; Neisseria.spp and Corynebacterium.spp as periodontitis negative microbiota (their average relative abundance were >5%). These representative strains of the above genus were used to infect OSCC cells to explore their effect on tumor cell biology behavior, and detect the expression level of the gene in related to inflammation, migration, invasion and cell cycle. We find that periodontitis positive correlated microbiota had a promoting effect on the development of oral squamous cell carcinoma in vitro by regulating mRNA and protein expression of IL-6, IL-8, MMP-9 and Cyclin-D1. Periodontitis negative correlated microbiota had suppression effect on the development of oral squamous cell carcinoma in vitro analysis.
Subject(s)
Head and Neck Neoplasms/microbiology , Microbiota , Periodontitis/microbiology , Squamous Cell Carcinoma of Head and Neck/microbiology , Bacteroidaceae Infections/complications , Bacteroidaceae Infections/microbiology , Bacteroidaceae Infections/pathology , Cell Line, Tumor , Cell Movement/physiology , Corynebacterium/genetics , Corynebacterium/isolation & purification , Fusobacterium Infections/complications , Fusobacterium Infections/microbiology , Fusobacterium Infections/pathology , Fusobacterium nucleatum/genetics , Fusobacterium nucleatum/isolation & purification , Head and Neck Neoplasms/metabolism , Head and Neck Neoplasms/pathology , Humans , Neisseria sicca/genetics , Neisseria sicca/isolation & purification , Neisseriaceae Infections/complications , Neisseriaceae Infections/microbiology , Neisseriaceae Infections/pathology , Porphyromonas gingivalis/genetics , Porphyromonas gingivalis/isolation & purification , Squamous Cell Carcinoma of Head and Neck/metabolism , Squamous Cell Carcinoma of Head and Neck/pathologyABSTRACT
The study of the interaction of bacteria with surfaces requires the detection of specific bacterial groups with high spatial resolution. Here, we describe a method to rapidly and efficiently add nanogold particles to oligonucleotide probes, which target bacterial ribosomal RNA. These nanogold-labeled probes are then used in an in situ hybridization procedure that ensures both cellular integrity and high specificity. Electron microscopy subsequently enables the visualization of specific cells with high local precision on complex surface structures. This method will contribute to an increased understanding of how bacteria interact with surface structures on a sub-micron scale.
Subject(s)
Bacteria/genetics , Bacteriological Techniques/methods , Microscopy, Electron, Scanning/methods , Nanoparticles/chemistry , Bacteria/isolation & purification , Bacteriological Techniques/instrumentation , Escherichia coli/genetics , Escherichia coli/isolation & purification , Gold/chemistry , In Situ Hybridization/methods , Neisseria sicca/genetics , Neisseria sicca/isolation & purification , Oligonucleotide Probes/chemical synthesis , Oligonucleotide Probes/chemistry , Oligonucleotide Probes/genetics , RNA, Bacterial , RNA, Ribosomal , Sensitivity and Specificity , Spectrometry, X-Ray EmissionABSTRACT
Neisseria sicca is rarely associated with clinical infections and to the authors' knowledge this organism has not been reported as a causative agent of infected biloma (liver abscess). A case of a diabetic man with infected biloma due to N. sicca after repeated transcatheter arterial embolization for hepatocellular carcinoma is reported. The patient was successfully treated with intravenous cefotaxime and metronidazole. The biochemical profile and 16S rRNA gene partial sequencing results of the isolate were in agreement with those of N. sicca.
