Gut microbiota-host immune-epithelial axis

The gut microbiota-host immune-epithelial axis is a multi-component system essential for maintaining human health and systemic homeostasis (Belkaid & Hand, 2014, Science). It involves a continuous dialogue between the intestinal microbiome, the single layer of epithelial cells forming the gut barrier, and the underlying mucosal immune system. The microbiota contributes to this axis by fermenting dietary fibers into short-chain fatty acids (SCFAs), which serve as energy sources for colonocytes and induce the differentiation of regulatory T cells (Tregs) to prevent excessive inflammation (Arpaia et al., 2013, Nature). Disruptions to this axis, known as dysbiosis, are implicated in the pathogenesis of inflammatory bowel disease (IBD), metabolic syndrome, and even neurodegenerative conditions (Fan & Pedersen, 2021, Nature Reviews Microbiology). Therapeutic strategies targeting this system include fecal microbiota transplantation (FMT) and live biotherapeutic products (LBPs) like SER-109, which aim to displace pathogens like Clostridioides difficile and restore a functional microbial ecosystem (Khanna et al., 2022, JAMA). Understanding this axis is critical for developing precision medicines that modulate the host-microbe interface to treat chronic inflammatory and autoimmune diseases.

Other names

Gut-immune axisMicrobiome-host interfaceIntestinal mucosal barrier systemGut-epithelial-immune crosstalkHost-microbe symbiotic interface

Restoration of microbial diversity to displace pathogens, production of immunomodulatory metabolites such as short-chain fatty acids (SCFAs), and reinforcement of the intestinal epithelial barrier to prevent systemic translocation of antigens.