Host-microbiota ecosystem and intestinal epithelial barrier

The host-microbiota ecosystem and intestinal epithelial barrier constitute a dynamic interface that separates the internal environment from the external luminal contents. This system includes a physical barrier of epithelial cells joined by tight junctions, a chemical barrier of mucus and antimicrobial peptides, and a diverse microbial community that interacts with the host immune system (Vancamelbeke & Vermeire, 2017). The microbiota plays a crucial role in fermenting dietary fibers into short-chain fatty acids, which serve as energy for colonocytes and maintain barrier integrity (Thursby & Juge, 2017). Disruptions to this ecosystem, known as dysbiosis, can lead to increased intestinal permeability, allowing the translocation of pro-inflammatory molecules like lipopolysaccharides into the bloodstream (Chelakkot et al., 2018). This "leaky gut" state is associated with various conditions, including inflammatory bowel disease, metabolic syndrome, and certain autoimmune disorders. Therapeutic interventions focus on restoring this balance through probiotics, prebiotics, or fecal microbiota transplantation to reinforce the barrier and modulate the host's immune response. Additionally, pharmacological agents like mucosal protectants and specific antibiotics are used to manage the microbial environment and protect the epithelial lining. Understanding the cross-talk between host cells and the microbiome is essential for developing targeted therapies for chronic inflammatory and metabolic diseases.

Other names

Gut barrierIntestinal mucosal barrierHost-microbiome interfaceGut-microbiota axis

Modulation of microbial composition, enhancement of tight junction protein expression, and regulation of mucosal immune cell activity.