Project description:Fusobacterium polymorphum has been implicated in oral squamous cell carcinoma, yet its ubiquitous presence in healthy individuals complicates its role as a disease driver and raises the possibility that some clinical isolates may possess greater pathogenic potential than others. To explore potential functional differences among isolates, we performed transcriptomic profiling of F. polymorphum strains obtained from across the oral epithelial disease spectrum. Despite being genetically indistinguishable, isolates derived from dysplastic lesions exhibited distinct transcriptional signatures, including significant upregulation of genes involved in heme uptake compared with isolates from healthy sites. These findings suggest that transcriptional heterogeneity among clinical isolates may contribute to functional differences that could influence their pathogenic potential.
Project description:Interspecies coaggregation promotes transcriptional changes of oral bacteria, contributing to the development of structurally balanced biofilms as well as oral diseases such as periodontitis. Streptococcus gordonii (S. gordonii) is an early colonizer of the oral cavity, and Fusobacterium nucleatum (F. nucleatum) may act as a bridge adhering to both early and late oral colonizers. These two species were commonly detected in healthy and periodontitis-diseased oral sites and could interact with immune cells such as macrophages. However, little research explored how intergeneric coaggregation affected transcriptional changes in S. gordonii and F. nucleatum subsp. polymorphum and how these gene changes might affect both species’ pathogenicity. The present study investigated transcriptional changes of both species in response to dual-species physical association using dual RNA-seq. Results indicated that after 30-min dual-species coaggregation, 148 genes were significantly up-regulated, and 124 genes were significantly down-regulated in S. gordonii. A total of 154 genes were significantly down-regulated, and 10 genes were significantly up-regulated in F. nucleatum subsp. polymorphum. A majority of up-regulated S. gordonii genes were involved in the biosynthesis and export of cell-wall proteins and the pathway of carbohydrate metabolism, and a group of down-regulated S. gordonii genes were associated with fatty acid biosynthesis and peptidoglycan biosynthesis. The transcriptome profiles indicated that the interspecies coaggregation led to a reduced level of DNA repair and lipopolysaccharides virulence in F. nucleatum subsp. polymorphum. The present study revealed that dual-species coaggregation induced a wide array of gene changes in S. gordonii and F. nucleatum subsp. polymorphum, enhancing S. gordonii’s adherence ability and attenuating F. nucleatum subsp. polymorphum's ability to produce LPS.
Project description:Fusobacterium polymorphum has been implicated in oral squamous cell carcinoma, yet its widespread presence in the oral cavity raises questions about whether different clinical isolates exert distinct effects on host cells. To explore host transcriptional responses, we performed transcriptomic profiling of dysplastic oral keratinocytes (DOK) following exposure to F. polymorphum isolates derived from across the oral epithelial disease spectrum. The host transcriptomic response revealed a broadly shared pro-inflammatory signature across all isolates, regardless of their clinical origin. However, expression of genes and pathways associated with cell proliferation and related signaling processes varied among isolates and correlated with the dysplasia severity of the lesions from which the strains were derived. These findings suggest that while F. polymorphum isolates elicit a common inflammatory response in epithelial cells, variation in host transcriptional programs linked to proliferation may reflect differences in their biological impact.
Project description:micro-RNA in cancer-associated fibroblasts in oral squamous cell carcinoma vs. dysplasia-associated fibroblasts from dysplastic oral lesions vs. normal fibroblasts from normal oral mucosa from healthy individual.
Project description:Neutrophils are known to be stimulated by different periodontal bacteria to produce reactive oxygen species and cytokines. It is inportant to investigate the gene changes made by bacteria of importance, of which, for periodontal disease, fusobaterium nucleatum is one. we used microarrays to investigate gene experssion changes in peripheral blood neutrophils werwhich e stimulated with or with out Fusobacterium Nucleatum (10953). Neutrophils from periodonatlly healthy individuals (n=4) were isolated and stimulated for 3hrs with or without fusobaterium nucleatum (10953). RNA was then extracted from these and pooled before hybridization on Affymetrix microarrays
Project description:Localization of Fusobacterium nucleatum in the placenta may be associated with pregnancy complications including preeclampsia (PE), but its specific pathobiology is unknown. Our aim was to analyze the effect of Fusobacterium nucleatum on HUVEC cells to further elucidate placental dysfunction in the context of Fusobacterium nucleatum infestation.
Project description:Fusobacterium nucleatum-treated LoVo cells reported an increased promoting CRC metastasis effect compared with PBS control. To understand the underlying mechanisms of Fusobacterium nucleatum-induced metastasis ability of CRC cells, we performed RNA-sequencing in LoVo cells s with or without Fusobacterium nucleatum treatment with three independent biological replicates.
Project description:Fusobacterium nucleatum-treated HCT116 cells reported an increased adhesion to endothelial cells compared with PBS control. To understand the underlying mechanisms of Fusobacterium nucleatum-induced intercellular adhesion ability of CRC cells, we performed RNA-sequencing in HCT116 cells with or without Fusobacterium nucleatum treatment with three independent biological replicates.
Project description:Identification of genes that are differentially regulated in fibroblasts derived from dysplastic oral mucosa and oral squamous cell carcinoma compared to fibroblasts derived from normal oral mucosa. Affymetrix microarrays were used to define differential gene expression.
