Host-gut microbiota axis

The host-gut microbiota axis refers to the complex symbiotic relationship between the human host and the trillions of microorganisms inhabiting the gastrointestinal tract. This ecosystem functions as a virtual metabolic organ, contributing to the digestion of complex carbohydrates, the synthesis of essential vitamins such as B12 and K, and the continuous calibration of the host immune system (NIH, 2023). Dysbiosis, or the pathological imbalance of these microbial communities, is strongly linked to various systemic diseases, including inflammatory bowel disease, metabolic syndrome, and certain neurodevelopmental disorders (Nature, 2021). While not a single molecular target, the microbiota is a critical therapeutic interface where drugs can modulate microbial composition or inhibit specific bacterial enzymes to improve health outcomes. Furthermore, the composition of the gut microbiota significantly influences the pharmacokinetics and clinical efficacy of various systemic drugs, including metformin and immune checkpoint inhibitors used in oncology (Science, 2019). Understanding this axis is essential for the development of personalized medicine and next-generation biotherapeutics.

Other names

Gut microbiomeIntestinal microbiotaCommensal floraGut-brain axisHuman microbiomeMicrobiota-host interactions

Modulation of microbial population density, alteration of microbial metabolic pathways (e.g., short-chain fatty acid production), and enhancement of host-microbe symbiotic signaling through pattern recognition receptors.