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The influence of gingipains on latent capacity of B cells

ABSTRACT: Porphyromonas gingivalis (P. gingivalis) is a key pathogen in periodontitis. Our previous study indicated that periodontitis induced by P. gingivalis increases the percentage of CD19+ B cells, Th17, Treg, gMDSCs and mMDSCs but decreases the ratio of B10 cells in CIA mice. It’s unclear which virulence factors of P. gingivalis are involved in these processes. Here, our study first indicated that such effects are mainly resulted from the undenatured proteins other than the DNA, RNA or LPS of P. gingivalis. As gingipains are enzymes and virulence factors which play vital role in the progression in periodontitis through affecting innate and adaptive immune system, we then compared the influence of the wild-type strain of P. gingivalis (ATCC33277) with its isogenic gingipain-null mutant (△K△RAB) on B cells. The results showed that B cells infected with △K△RAB exhibited increased levels of IL-6 and others cytokines (IL-1β，IL-23) involve in Th17 differentiation compared to wild-type strain, also the frequency of IL-10 producing regulatory B cells (B10). Furthermore, the peritonitis induced by △K△RAB enhanced the proportion of B10 and Th17 compared with treated with ATCC33277. Cumulatively, this study preliminarily revealed deletion of gingipains affected the antigen presentation of B cell that promoted B cells express the cytokines which promoted T cells toward Th17 and the secretion immunosuppressive cytokines of B cells that enhanced the frequency of B10 which implicated gingipains are vital in altering B cell function to participated immune response.

ORGANISM(S): Mus musculus

PROVIDER: GSE195704 | GEO | 2023/05/29

REPOSITORIES: GEO

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Porphyromonas gingivalis outer membrane vesicles promote apoptosis via msRNA-regulated DNA methylation in periodontitis

Project description:The outer membrane vesicles (OMVs) produced by Porphyromonas gingivalis (P. gingivalis) contain a variety of bioactive molecules that may be involved in the progression of periodontitis. However, the participation of P. gingivalis OMVs in the development of periodontitis has not been elucidated. Here we isolated P. gingivalis OMVs and confirmed their participation in periodontitis both in vivo and in vitro. Microcomputed Tomography (micro-CT) and histological analysis showed that under the stimulation of P. gingivalis OMVs, the alveolar bone of rats was significantly resorbed in vivo. We found that P. gingivalis OMVs were taken up by hPDLCs (human Periodontal Ligament Cells, hPDLCs) in vitro, then subsequently resulting in apoptosis and inflammatory cytokines releasing which was accomplished by the microRNA-size small RNAs (msRNAs) sRNA45033 in the P. gingivalis OMVs. Through bioinformatics analysis and screening of target genes, Chromobox 5 (CBX5) was identified as the downstream target of screened-out small RNA s45033. Using dual-luciferase reporter assay, overexpression, and knockdown methods, s45033 was confirmed to target CBX5 to regulate hPDLCs apoptosis. In addition, Cleavage Under Targets and Tagmentation (Cut&Tag) analysis confirmed the mechanism that CBX5 regulates apoptosis through the methylation of p53 DNA. Collectively, these findings indicate that the role of P. gingivalis OMVs is immunologically relevant and related to bacterial virulence in the development of periodontitis.

2022-11-30 | GSE218606 | GEO

Effect of P. gingivalis on human primary gingival epithelial cells

Project description:EXPERIMENT: Microarray expression profiles derived from the human primary gingival epithelial cells 24.0h after exposure to heat inactivated P. gingivalis ANIMAL MODEL: NON EXPOSURE: Human primary gingival epithelial cells (at 3rd passage) were exposed to heat inactivated P. gingivalis (MOI:100) at 90% confluence. Two types of gingival epithelial cells were used. One with Normal cytokine inducer type (at least 2 fold IL-6/TNF-alpha/IL-1Ã when challenged with TLR2/4 agonists) and the other with diminished cytokine inducer type (no change in IL-6/TNF-alpha/IL-1Ã when challenged with TLR2/4 agonists). INTERVAL: NON. PLATFORM: microRNA expression profile in gingival epithelial cells - miRCURY LNAâ¢ microRNA Arrays (Exiqon). The RNA samples were subjected to microarray on 8/9/2007 Keywords = Human primary gingival epithelial cells Keywords = P. gingivalis Keywords = Periodontitis Keywords: Ordered The effect of heat inactivated P. gingivalison human primary gingival epithelial cells were assayed.

2010-05-16 | E-GEOD-13042 | biostudies-arrayexpress

Effect of P. gingivalis on human primary gingival epithelial cells

Project description:EXPERIMENT: Microarray expression profiles derived from the human primary gingival epithelial cells 24.0h after exposure to heat inactivated P. gingivalis ANIMAL MODEL: NON EXPOSURE: Human primary gingival epithelial cells (at 3rd passage) were exposed to heat inactivated P. gingivalis (MOI:100) at 90% confluence. Two types of gingival epithelial cells were used. One with Normal cytokine inducer type (at least 2 fold IL-6/TNF-alpha/IL-1ß when challenged with TLR2/4 agonists) and the other with diminished cytokine inducer type (no change in IL-6/TNF-alpha/IL-1ß when challenged with TLR2/4 agonists). INTERVAL: NON. PLATFORM: microRNA expression profile in gingival epithelial cells - miRCURY LNA™ microRNA Arrays (Exiqon). The RNA samples were subjected to microarray on 8/9/2007 Keywords = Human primary gingival epithelial cells Keywords = P. gingivalis Keywords = Periodontitis Keywords: Ordered

2008-11-07 | GSE13042 | GEO

Polyphenols from Myrothamnus flabellifolia Welw. inhibit in vitro adhesion of Porphyromonas gingivalis and exert anti-inflammatory cytoprotective effects in KB cells

Project description:Investigation of whole genome gene expression level changes in Porphyromonas gingivalis ATCC 33277 treated with an anti-adhesive extract from Myrothamnus flabellifolia compared to the untreated strain. Aim: Identification of anti-adhesive plant extracts against cell surface binding of Porphyromonas gingivalis. Materials and Methods: Polyphenol-enriched extract from Myrothamnus flabellifolia (MF) traditionally used for periodontitis was tested for inhibition of P. gingivalis adhesion to KB cells by FACS, for influence on gingipain activity, hemagglutination and by microarray analysis for effects on the bacterial transcriptome. P. gingivalis-induced inflammation parameters were monitored by RT-PCR. Results: MF (100 µg/ml) reduced P. gingivalis adhesion/invasion about 50% by interacting with fimbriae and bacterial OMPs. Microarray analysis of MF-treated bacteria indicated up-regulation of genes involved in cell adhesion. As confirmed by RT-PCR, fimbrillin- and Arg-gingipain-encoding genes were upregulated by MF. On the protein level, inhibition (70%) of Arg-gingipain activity was observed, while the corresponding Lys-gingipain was hardly influenced. MF also inhibited hemagglutination. While exposure to P. gingivalis resulted in an increased expression of inflammation-related genes in KB cells, pretreatment of KB cells with MF evoked cytoprotective effects concerning IL-1β, IL-6, IL-8 and TNFα gene expression as well as IL-6 release rates. Conclusions: While being cytoprotective, MF exerts strong anti-adhesive effects against P. gingivalis. Thus, MF may be useful for the prevention of P. gingivalis-associated periodontal diseases. The chip study used total RNA recovered from two separate MF-treated and two separate untreated Porphyromonas gingivalis ATCC 33277 cultures. Each chip measured the expression level of 1,842 genes from P. gingivalis ATCC 33277 with thirteen 60-mer probes per gene, with three-fold technical redundancy.

2010-09-02 | E-GEOD-23939 | biostudies-arrayexpress

EGAS00001003823-sc-2019-08-27T13:27:24Z - samples

Project description:Cytokines affect T cell responses by polarising them to different phenotypes. We isolated T cells from healthy platelet donors and cultured them in resting and stimulated conditions, as well as in the presence of Th1, Th2, Th17 and iTreg cocktail. In addition, T cells were stimulated in the presence of IL-10, IL-21, IL-27, IFNb and TNFa. We performed bulk RNA sequencing to assess impact of different disease-relevant cytokines upon T cell response.

| EGAD00001005291 | EGA

Induction and molecular signature of pathogenic Th17 cells

Project description:TGF-beta3 produced by developing Th17 cells induces highly pathogenic T cells that are functionally and molecularly distinct from TGF-beta1-induced Th17 cells. The microarray data represent a distinct molecular signature for pathogenic versus non-pathogenic Th17 cells. Total of seven groups with two to four samples per group from two independent experiments. The no cytokines group (Th0) was used as a control to normalize the data. 7 groups: B6: (IL-1beta, IL-6) B623: (IL-1beta, IL-6, IL-23) T16: (TGF-beta1, IL-6) T1623: (TGF-beta1, IL-6, IL-23) T36: (TGF-beta3, IL-6) T3623: (TGF-beta3, IL-6, IL-23) NOCYTO: no cytokines

2012-09-01 | E-GEOD-39820 | biostudies-arrayexpress

Polyphenols from Myrothamnus flabellifolia Welw. inhibit in vitro adhesion of Porphyromonas gingivalis and exert anti-inflammatory cytoprotective effects in KB cells

2010-09-02 | GSE23939 | GEO

Explore the gene expression files of HGECs after P. gingivalis persisters treatment via RNA sequencing

Project description:This study investigated how P. gingivalis persisters interacted with human gingival epithelial cells (HGECs) and affected the gene expression of cytokines, and the related signaling pathways, via RNA sequencing. P. gingivalis (ATCC 33277) was treated with metronidazole (100 μg/ml) for 6 hours to generate P. gingivalis persisters (M-PgPs). HGECs with or without IL-1β pretreatment were stimulated by M-PgPs and P. gingivalis for 24 hours, and those without any treatments served as the blank control (BL).

2022-05-31 | GSE184777 | GEO

Human AoSMCs stimulated by viable P. gingivalis

Project description:Porphyromonas gingivalis is a gram-negative bacterium that causes destructive chronic periodontitis. In addition, this bacterium is also involved in the development of cardiovascular disease. The aim of this study was to investigate the effects of P. gingivalis infection on gene and protein expression in human aortic smooth muscle cells (AoSMCs) and its relation to cellular function.

2013-11-17 | E-MTAB-1922 | biostudies-arrayexpress

Mouse Th17 T cells, IL-23 stimulated

Project description:Interleukin 23 (IL-23) triggers pathogenic features in pro-inflammatory, IL-17-secreting T cells (Th17 and Tγδ17) that play a key role in the development of inflammatory diseases. However, the IL-23 signaling cascade remains largely undefined. Here we used quantitative phosphoproteomics to characterize IL-23 signaling in primary murine Th17 cells. We quantified 6,888 phosphorylation sites in Th17 cells, and found 168 phosphorylations regulated upom IL-23 stimulation. IL-23 increased the phosphorylation of the myosin regulatory light chain (RLC), an actomyosin contractibility marker, in Th17 and Tγδ cells. IL-23-induced RLC phosphorylation required JAK2 and ROCK catalytic activity, and the study of the IL-23/ROCK axis revealed an unexpected role of IL-23 in the migration of Tγδ17 and Th17 cells. Moreover, pharmacological inhibition of ROCK reduced Tγδ17 recruitment to inflamed skin upon challenge with inflammatory agent Imiquimod. This work: i) provides new insights into phosphorylation networks that control Th17 cells, ii) widely expands the current knowledge on IL-23 signaling, and iii) contributes to the increasing list of immune cells subsets characterized by global phosphoproteomic approaches.

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