Adaptive immune system via gut microbiota–immune axis

The adaptive immune system via the gut microbiota–immune axis refers to the complex, bidirectional communication network between the diverse community of microorganisms in the gastrointestinal tract and the host's specialized immune cells (Belkaid & Hand, 2014, Science). This axis is fundamental for the development and education of the adaptive immune system, particularly in the differentiation of T-cell subsets such as regulatory T-cells (Tregs) and Th17 cells, as well as the production of secretory IgA by B-cells (Rooks & Garrett, 2016, Nature Reviews Immunology). Gut microbes produce bioactive metabolites, most notably short-chain fatty acids (SCFAs) like butyrate and propionate, which act as signaling molecules to maintain immune homeostasis and intestinal barrier integrity (Koh et al., 2016, Cell). Dysbiosis, or an imbalance in this microbial community, is strongly associated with the pathogenesis of autoimmune diseases, inflammatory bowel disease (IBD), and even the efficacy of cancer immunotherapies like PD-1 inhibitors (Gopalakrishnan et al., 2018, Science). While the axis itself is a physiological system rather than a single molecular target, it is therapeutically modulated using probiotics, prebiotics, and fecal microbiota transplantation (FMT) to restore immune balance (NIH, 2023). Understanding this axis is crucial for developing precision medicine approaches that leverage the microbiome to treat systemic inflammatory and immune-mediated conditions.

Other names

Gut-immune axisMicrobiota-immune crosstalkGut-microbiota-immune system axisIntestinal microbiota-immune axis

Modulation of the host immune system through microbial metabolites (e.g., short-chain fatty acids) and direct interaction with pattern recognition receptors to influence T-cell and B-cell activity.