Probiotic Modulation of Intestinal Immunity and Barrier Function
Summary
Probiotics, defined as live microorganisms that confer health benefits when administered in adequate amounts, exert multifaceted effects on the intestinal mucosa. Central to these effects is the modulation of innate and adaptive immune responses and the reinforcement of epithelial barrier integrity. Probiotic strains interact with epithelial and immune cells via surface proteins, secreted metabolites and cellular components, triggering signalling pathways that regulate cytokine production, promote mucin secretion and enhance tight junction assembly. These interactions not only bolster defence against pathogens but also attenuate inflammatory processes implicated in conditions such as inflammatory bowel disease and infection‐induced enteritis. Mechanistic studies reveal that certain probiotic‐derived factors can induce epigenetic changes in epithelial cells, sustain anti‐inflammatory programmes and stimulate regulatory T‐cell differentiation. In parallel, bacterial metabolites and structural components such as exopolysaccharides, short‐chain fatty acids and polyphosphate act on pattern recognition receptors to fine‐tune T-cell responses and preserve barrier homeostasis. Collectively, these insights underpin the global significance of probiotics as accessible interventions for maintaining intestinal health, preventing disease flares and supporting recovery of barrier function following injury.
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Probiotic Modulation of Intestinal Immunity and Barrier Function publication trend
The graph below shows the total number of articles in probiotic modulation of intestinal immunity and barrier function across all publications each year (not limited to Nature Index journals).
Technical terms
Probiotic bacteria: Live microorganisms that, when administered in adequate amounts, confer a health benefit on the host.
Intestinal epithelial cells: The single‐cell layer lining the gut lumen, responsible for nutrient absorption and barrier function.
Barrier function: The capacity of the intestinal epithelium to prevent translocation of pathogens and toxins while allowing selective nutrient uptake.
Mucosal immune system: The network of immune cells and signalling molecules located at the gut surface that defends against pathogens and maintains tolerance to commensals.
Tight junctions: Protein complexes between adjacent epithelial cells that seal the paracellular space and regulate permeability.
Epigenetic modulation: Stable changes in gene expression induced by modifications such as DNA methylation or histone methylation without altering the DNA sequence.
Exopolysaccharides: High-molecular-weight polysaccharides secreted by bacteria that can interact with host receptors to modulate immune responses.
Postbiotic: Non-viable microbial cells, cell components or metabolites that confer health benefits to the host.
References
- Identification of a functional peptide of a probiotic bacterium-derived protein for the sustained effect on preventing colitis. Gut Microbes (2023).
- Metabolic inputs in the probiotic bacterium Lacticaseibacillus rhamnosus contribute to cell-wall remodeling and increased fitness. npj Biofilms and Microbiomes (2023).
- Postbiotic Fractions of Probiotics Lactobacillus plantarum 299v and Lactobacillus rhamnosus GG Show Immune-Modulating Effects. Cells (2023).
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