Intestinal microbiota ecosystem

The Intestinal microbiota ecosystem is the total community of microorganisms—including bacteria, archaea, fungi, viruses, and phages—that inhabit the human gastrointestinal tract. This ecological system confers vital metabolic, nutritional, protective, and immunological functions, such as fermenting otherwise indigestible fibers, producing essential micronutrients, defending against pathogenic microbes, and educating the immune system. Alterations or imbalances in the microbiota (dysbiosis) are associated with a broad range of diseases, both within the gut (e.g., irritable bowel syndrome, inflammatory bowel disease) and throughout the body (e.g., metabolic syndrome, obesity, neuropsychiatric conditions). Therapeutic interventions aim to restore or modulate this ecosystem using antibiotics, probiotics, prebiotics, or fecal microbiota transplantation. The intestine’s microbial community is not a classical drug target like a receptor or enzyme but is a critical modifiable factor in human physiology and disease. Because it is not a protein, receptor, enzyme, or single molecular entity, “Intestinal microbiota ecosystem” should not be classified as a standard therapeutic target. Its inclusion as a molecular target name is therefore considered incorrect, though it is a medically relevant concept.

Other names

Gut microbiotaGut microbiomeIntestinal floraIntestinal microbial ecosystemGut flora

Antibiotics: kill or inhibit growth of gut microbes, causing compositional shifts Probiotics: add specific live organisms intended to restore or modulate the ecosystem Prebiotics: provide fermentable substrates to promote beneficial microbes Fecal transplantation: re-establish ecological balance via introducing healthy donor microbiota Many drugs may be metabolized or inactivated by gut microbial enzymes