Gut-Immune-Microbiota Axis

The Gut-Immune-Microbiota Axis is a complex biological system comprising the intestinal epithelial barrier, the host's mucosal immune system, and the diverse community of resident microorganisms (Thursby E, et al., Biochem J, 2017). This interface is critical for maintaining physiological homeostasis, as the microbiota provides essential metabolic signals that shape immune development and maintain the integrity of the epithelial lining (Belkaid Y, et al., Cell, 2014). In a healthy state, the mucosal barrier prevents the translocation of pathogenic organisms while allowing for nutrient absorption and the presence of beneficial commensals. However, disruptions in this axis—often characterized by increased intestinal permeability and microbial imbalance (dysbiosis)—are central to the pathogenesis of inflammatory bowel disease (IBD), metabolic disorders, and systemic autoimmune conditions (Lynch SV, et al., N Engl J Med, 2016). Therapeutic strategies targeting this axis do not typically focus on a single molecule but rather aim to restore balance through antibiotics, probiotics, or biologics that target specific cytokines like TNF-alpha or integrins to reduce mucosal inflammation (Hooper LV, et al., Science, 2012). Because this entry describes a multi-component biological system rather than a discrete molecular target like a receptor or enzyme, it is classified as a system-level interface.

Other names

Host intestinal mucosa, immune system, and resident/pathogenic microbiotaGut-microbiome-immune interfaceIntestinal mucosal barrier systemGut-microbiota-immune axis

Modulation of the intestinal microbial composition, enhancement of epithelial barrier integrity, and regulation of mucosal immune signaling through cytokine neutralization or inhibition of leukocyte trafficking (Danese S, et al., N Engl J Med, 2011).