نتایج جستجو برای: porphyromonas

تعداد نتایج: 3941  

Journal: :Infection and immunity 1991
P B Chen L B Davern A Aguirre

The purpose of this report was to study the role of T lymphocytes following injection of Porphyromonas gingivalis in a mouse abscess model. Three invasive P. gingivalis isolates (ATCC 53977, W83, and AJW4) were injected into athymic BALB/c mice and their heterozygous (nu/+) littermates. The athymic BALB/c (nu/nu) mice were able to localize the invasive P. gingivalis isolates at the injection si...

Journal: :Microbiology 1995
T Barbeyron P Potin C Richard O Collin B Kloareg

Arylsulphatase activity was identified in cultures of the marine bacterium Alteromonas carrageenovora, using methylumbelliferyl sulphate as substrate. In contrast with most other microbial arylsulphatases, arylsulphatase production in A. carrageenovora was not repressed by sulphate. The structural gene of arylsulphatase (atsA) was cloned and sequenced. An ORF of 984 bp was found, specifying a p...

2010
Gabriel Nussbaum Elia Burns Tal Eliyahu Satoshi Uematsu Shizuo Akira

Journal: :Journal of clinical microbiology 2009
Bing-yan Wang Jie Wu Richard J Lamont Xinghua Lin Hua Xie

Porphyromonas gingivalis is one of the major causative agents of adult periodontitis. One of the features of this periodontal pathogen is its ability to attach to a variety of oral bacterial surfaces and to colonize subgingival dental plaque. We have shown that Streptococcus cristatus CC5A inhibits expression of fimA, a gene encoding the major protein subunit of long fimbriae in P. gingivalis; ...

Journal: :Journal of clinical microbiology 1999
R W Rumpf A L Griffen B G Wen E J Leys

The ribosomal intergenic spacer regions (ISRs) of 19 laboratory strains and 30 clinical samples of Porphyromonas gingivalis were amplified by PCR and sequenced to provide a strain identifier. The ISR is a variable region of DNA located between the conserved 16S and 23S rRNA genes. This makes it an ideal locus for differentiation of strains within a species: primers specific for the conserved fl...

Journal: :Infection and immunity 1992
D Grenier

A mutual symbiotic enhancement of growth of Porphyromonas gingivalis and Treponema denticola is described in this report. Brain heart infusion broth supplemented with vitamin K did not support the individual growth of P. gingivalis or T. denticola. However, when inoculated as a mixture, both bacterial species did grow significantly. The growth-stimulating factors produced by P. gingivalis and T...

Journal: :Journal of infection in developing countries 2010
Nada M Souccar Marita Chakhtoura Joseph G Ghafari Alexander Michael Abdelnoor

BACKGROUND The periodontopathogen Porphyromonas gingivalis (Pg) has been reported as a risk factor for preterm labour. Its pathogenesis and role in pregnancy have not been investigated in Lebanon. Elevated C-reactive protein (CRP) levels in pregnant women with periodontitis also appear to mediate preterm labour. METHODOLOGY The study included 20 pregnant women with periodontitis and 20 with n...

2013
Shu-Chen Hung Chul Hee Choi Najwane Said-Sadier Larry Johnson Kalina Rosenova Atanasova Hanen Sellami Özlem Yilmaz David M. Ojcius

We have previously reported that Porphyromonas gingivalis infection of gingival epithelial cells (GEC) requires an exogenous danger signal such as ATP to activate an inflammasome and caspase-1, thereby inducing secretion of interleukin (IL)-1β. Stimulation with extracellular ATP also stimulates production of reactive oxygen species (ROS) in GEC. However, the mechanism by which ROS is generated ...

Journal: :Journal of periodontology 1999
J V Califano R E Schifferle J C Gunsolley A M Best H A Schenkein J G Tew

BACKGROUND Six serotypes of Porphyromonas gingivalis have recently been described. We sought to test the hypothesis that serotype specific carbohydrates from these strains are important antigens that elicit potent immune responses. METHODS Serum concentrations of IgG reactive with P. gingivalis serotypes K1-K6 were determined for 28 adult (AP) and 28 generalized early-onset (G-EOP) periodonti...

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