Background And Objective: The gingival epithelium provides the first line of defense against colonization by periodontal pathogens, both as a physical barrier and by the production of inducible innate immune mediators such as beta-defensins and pro-inflammatory cytokines. The gram-negative bacterium Aggregatibacter actinomycetemcomitans is implicated in the pathogenesis of localized aggressive periodontitis, although the bacterium is found widely in the healthy population. We hypothesized that gingival epithelial cell-derived innate immune mediators triggered in response to A. actinomycetemcomitans infection may play an important role in increased susceptibility to infection.
Material And Methods: Primary cultures of human gingival epithelial cells were cultured in the presence of A. actinomycetemcomitans. Total mRNA was examined for the presence of innate immune markers using RT-PCR.
Results: We show here that the mRNA levels of human beta-defensin 2 and interleukin-8 are elevated by live cultures of a clinical isolate of A. actinomycetemcomitans in cultured gingival epithelial cells from healthy individuals, but not by A. actinomycetemcomitans lipopolysaccharide. Cells from a patient with localized aggressive periodontitis, however, did not respond to this bacterial stimulation. In contrast, the pro-inflammatory cytokine interleukin-19 was induced in cells from both localized aggressive periodontitis and healthy subjects. Examination of Toll-like receptors and associated adapter molecules indicated lower levels of Toll-like receptor 2 mRNA in the localized aggressive periodontitis patient-derived cells compared with cells from healthy subjects.
Conclusion: These results suggest that a differential expression of innate immune response genes to A. actinomycetemcomitans in the gingival epithelium could be an underlying factor of susceptibility to localized aggressive periodontitis.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1111/j.1600-0765.2007.00998.x | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Interactions between epithelial mesenchymal plasticity, barrier dysfunction and innate immune pathways shape the genesis of allergic airway disease.
Expert Rev Respir Med
January 2025
School of Medicine and Public Health, University of Wisconsin Madison, Madison, WI, USA.
Introduction: In genetically predisposed individuals, exposure to aeroallergens and infections from RNA viruses shape epithelial barrier function, leading to Allergic Asthma (AA). Here, activated pattern recognition receptors (PRRs) in lower airway sentinel cells signal epithelial injury-repair pathways leading to cell-state changes [epithelial mesenchymal plasticity (EMP)], barrier disruption and sensitization.
Areas Covered: 1.
Short-term effects of follicle stimulating hormone on immune function, lipid, and vitamin metabolism in transiently castrated men.
Endocr Connect
January 2025
Y Giwercman, Translational Medicine, Lund University, Malmö, Sweden.
Background: Prostate cancer therapy with surgical or chemical castration with GnRH agonists has been linked to elevated FSH levels, which may contribute to secondary health disorders, including atherosclerosis and diabetes. Although recent findings suggest a role for FSH beyond the reproductive system, its metabolic impact remains unclear and difficult to disentangle from that of androgens. In this study, we examined the metabolic changes induced by FSH and distinguished them from those caused by testosterone.
View Article and Find Full Text PDFInduction of innate immunity and plant growth promotion in tomato unveils the antiviral nature of bacterial endophytes against groundnut bud necrosis virus.
J Virol
December 2024
Agriculture College and Research Institute, Kudumiyanmalai, Pudukottai, Tamil Nadu, India.
Tomato is an important crop worldwide, but groundnut bud necrosis virus (GBNV) often hampers its growth. This study investigates the antiviral potential of bacterial endophytes, including CNEB54, CNEB4, CNEB26, and BAVE5 against GBNV, as well as their ability to enhance immunity and growth in tomato. All four bacterial isolates demonstrated a significant delay in GBNV symptom development 10 days post-inoculation, with disease incidence ranging from 18% to 36% compared to 84% in control.
View Article and Find Full Text PDFCharacteristics of viral ovarian tumor domain protease from two emerging orthonairoviruses and identification of Yezo virus human infections in northeastern China as early as 2012.
J Virol
December 2024
State Key Laboratory of Pathogen and Biosecurity, Academy of Military Medical Sciences, Beijing, China.
Emerging tick-borne orthonairovirus infections pose a growing global concern, with limited understanding of the viral ovarian tumor-like cysteine proteases (vOTUs) encoded by novel orthonairoviruses. These vOTUs, a group of deubiquinylases (DUBs), disrupt the innate immune response. Yezo virus (YEZV), a recently discovered pathogenic orthonairovirus, was first reported in Japan in 2021.
View Article and Find Full Text PDFThe importance of Fcγ and C-type lectin receptors in host immune responses during pneumonia.
Infect Immun
December 2024
Department of Internal Medicine, Division of Pulmonary and Critical Care Medicine, the Thoracic Diseases Research Unit, Mayo Clinic College of Medicine, Rochester, Minnesota, USA.
pneumonia (PJP) remains a significant cause of morbidity and mortality during AIDS. In AIDS, the absence of CD4 immunity results in exuberant and often fatal PJP. In addition, organism clearance requires a balanced macrophage response since excessive inflammation promotes lung injury and respiratory failure.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!