It is estimated that Helicobacter pylori infects the stomachs of over 50% of the world's population and if not treated may cause chronic gastritis, peptic ulcer disease, gastric adenocarcinoma and gastric B-cell lymphoma. The aim of this study was to enhance the mucosal and systemic immune responses against the H. pylori antigens cytotoxin-associated gene A (CagA) and neutrophil-activating protein (NAP), through combinations of mucosal and systemic immunizations in female BALB/c mice. We found that oral or intranasal (i.n.) followed by i.m. immunizations induced significantly higher serum titres against NAP and CagA compared to i.n. alone, oral alone, i.m. alone, i.m. followed by i.n. or i.m. followed by oral immunizations. However, only oral followed by i.m. immunizations induced anti-NAP antibody-secreting cells in the stomach. Moreover, mucosal immunizations alone or in combination with i.m., but not i.m. immunizations alone, induced mucosal immunoglobulin A (IgA) responses in faeces. Any single route or combination of immunization routes with NAP and CagA preferentially induced antigen-specific splenic interleukin-4-secreting cells and far fewer interferon-gamma-secreting cells in the spleen. Moreover, i.n. immunizations alone or in combination with i.m. immunizations induced predominantly serum IgG1 and far less serum IgG2a. Importantly, we found that while both i.n. and i.m. recall immunizations induced similar levels of serum antibody responses, mucosal IgA responses in faeces were only achieved through i.n. recall immunization. Collectively, our data show that mucosal followed by systemic immunization significantly enhanced local and systemic immune responses and that i.n. recall immunization is required to induce both mucosal and systemic memory type responses.
Download full-text PDF |
Source |
---|---|
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1783019 | PMC |
http://dx.doi.org/10.1046/j.1365-2567.2003.01711.x | DOI Listing |
Microbiol Immunol
December 2024
Department of Oral Microbiology and Immunology, Showa University Graduate School of Dentistry, Shinagawa-ku, Tokyo, Japan.
J Control Release
December 2024
Department of Otolaryngology, Ren Ji Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200127, China. Electronic address:
Background: Chronic rhinosinusitis (CRS) is an inflammatory disease characterized by persistent immune dysregulation, which presents considerable limitations in current medical therapy.
Objects: This study investigates a supramolecular gel (PSPD), which aims to minimize systemic adverse effects through local injection, provide long-lasting anti-inflammatory effects, and modulate the mucosal immune microenvironment.
Methods: The properties of PSPD were evaluated using rheological experiments.
Microb Pathog
December 2024
Baotou Medical College, Inner Mongolia University of Science and Technology, Baotou 014000, China; Department of gastroenterology, The First Affiliated Hospital of Baotou Medical College, Inner Mongolia University of Science and Technology, Baotou 014000, China. Electronic address:
Chronic obstructive pulmonary disease (COPD) is a systemic inflammatory disease impacting both the respiratory and gastrointestinal systems, with its pathogenesis closely linked to the lung-gut axis theory. In this study, we established a rat model of COPD using a fumigation method combined with intra-airway administration of lipopolysaccharide (LPS) to investigate the effects of lactulose on lung and intestinal tissues, focusing on related inflammatory markers and the TLR4/NF-κB signaling pathway. We further explored the therapeutic effects and mechanisms of lactulose on the lung-intestinal tissues in COPD rats, aiming to expand its potential application in chronic respiratory diseases.
View Article and Find Full Text PDFJ Dent Res
December 2024
Beijing Laboratory of Oral Health and Beijing Stomatological Hospital, Capital Medical University, Beijing, China.
NPJ Biofilms Microbiomes
December 2024
BGI Research, Shenzhen, 518083, China.
The episymbiotic Candidatus Saccharibacteria is the most studied lineage of candidate phyla radiation. Living an epiparasitic lifestyle, Saccharibacteria might be associated with human mucosal diseases by modulating the structure of the oral microbiome through interactions with host bacteria. However, the knowledge of Saccharibacterial genomic diversity and the potential underlying their adaptation to a wide range of habitats remains limited.
View Article and Find Full Text PDFEnter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!