Probiotic Modulation of Gut Immune Responses
Summary
Probiotic modulation of gut immune responses encompasses the mechanisms by which live beneficial microorganisms influence host defence and maintain intestinal homeostasis. These microbes interact with the mucosal immune system through multiple routes: by strengthening epithelial barrier integrity, by secreting bioactive molecules that alter cytokine profiles, and by stimulating regulatory pathways that temper inflammation. Probiotics can reinforce tight junctions between epithelial cells, reducing intestinal permeability and preventing translocation of harmful antigens. They also produce metabolites and small signalling compounds—such as short-chain fatty acids and histamine—that engage specific receptors on immune and epithelial cells, promoting anti-inflammatory cytokine secretion and the expansion of regulatory T cells. This multifaceted communication supports tolerance to commensal bacteria while preserving effective defence against pathogens. The global significance of this field lies in its potential to complement or replace traditional therapies for inflammatory bowel diseases, allergies and systemic inflammatory disorders, offering dietary or microbial interventions that harness natural immune-modulatory processes.
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Probiotic Modulation of Gut Immune Responses publication trend
The graph below shows the total number of articles in probiotic modulation of gut immune responses across all publications each year (not limited to Nature Index journals).
Technical terms
Probiotics: Live microorganisms which, when administered in adequate amounts, confer health benefits on the host.
Extracellular vesicles: Membrane-bound particles released by bacteria that carry proteins, lipids and nucleic acids to modulate host cell functions.
Outer membrane vesicles: Vesicles derived from the outer membrane of Gram-negative bacteria that deliver immunoactive compounds to host tissues.
Host defence peptides: Endogenous small cationic peptides produced by epithelial cells that possess antimicrobial and immunomodulatory properties.
Cytokines: Secreted signalling proteins that regulate immune cell activation, differentiation and inflammatory responses.
Tight junction proteins: Transmembrane and scaffold proteins that seal adjacent epithelial cells, maintaining barrier integrity and regulating paracellular permeability.
References
- Extracellular vesicles of the Gram-positive gut symbiont Bifidobacterium longum induce immune-modulatory, anti-inflammatory effects. npj Biofilms and Microbiomes (2023).
- Intestinal Anti-inflammatory Effects of Outer Membrane Vesicles from Escherichia coli Nissle 1917 in DSS-Experimental Colitis in Mice. Frontiers in Microbiology (2017).
- Lactobacillus reuteri I5007 Modulates Intestinal Host Defense Peptide Expression in the Model of IPEC-J2 Cells and Neonatal Piglets. Nutrients (2017).
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