Intestinal microbiome and intestinal barrier

The intestinal microbiome and intestinal barrier constitute a complex, integrated biological system that serves as the primary interface between the host and the external environment. The microbiome is a diverse ecosystem of trillions of microorganisms that play a vital role in nutrient metabolism, vitamin synthesis, and the maturation of the host immune system (Thursby & Juge, 2017, "Introduction to the human gut microbiota"). The intestinal barrier is a multi-layered defense mechanism consisting of a protective mucus layer, a single layer of epithelial cells secured by tight junctions, and an underlying network of immune cells (Vancamelbeke & Vermeire, 2017, "The intestinal barrier: a fundamental role in health and disease"). Disruption of this axis, characterized by increased intestinal permeability ("leaky gut") and microbial dysbiosis, is strongly associated with the pathogenesis of inflammatory bowel disease, celiac disease, and various metabolic disorders (Bischoff et al., 2014, "Intestinal permeability – a new target for disease prevention and therapy"). While the system as a whole is not a single molecular target, it is a major focus of drug development, with interventions ranging from probiotics and prebiotics to small molecules like zonulin inhibitors designed to restore barrier integrity and microbial balance.

Other names

Gut microbiotaIntestinal mucosal barrierGut-intestinal barrier axisGastrointestinal microbiome

Therapeutic strategies targeting this system involve the modulation of microbial diversity to favor commensal species, the upregulation of tight junction proteins such as claudins and occludin to reinforce the physical barrier, and the regulation of mucosal immune activity to prevent chronic inflammation.