Gut microbiota and colonic fermentation system

The gut microbiota and colonic fermentation system is a complex biological community consisting of trillions of microorganisms, including bacteria, archaea, fungi, and viruses, that reside in the human digestive tract (NIH, 2023). This system functions as a metabolic organ by fermenting non-digestible dietary fibers into short-chain fatty acids (SCFAs), such as butyrate and propionate, which provide energy to colonocytes and regulate systemic inflammation (Cell Host & Microbe, 2020). Additionally, the microbiota is essential for the synthesis of vitamins K and B12, the metabolism of bile acids, and the development of the host's innate and adaptive immune systems (Nature Reviews Microbiology, 2019). Dysbiosis, or a functional imbalance in this ecosystem, is strongly associated with various diseases, including inflammatory bowel disease (IBD), obesity, and Clostridioides difficile infections (Nature Reviews Gastroenterology & Hepatology, 2022). Therapeutic strategies targeting this system include the use of probiotics and prebiotics to shift microbial composition, as well as fecal microbiota transplantation (FMT) to restore a healthy microbial environment (Frontiers in Microbiology, 2021). Drugs like metformin and certain antibiotics also interact with this system, either by altering microbial diversity or by suppressing specific pathogenic populations (PubMed, 2021). The system's role in the gut-brain axis further links microbial activity to neurological and psychiatric health (Nature, 2020). Overall, the colonic fermentation system is a critical mediator of host health and a burgeoning area for novel therapeutic development.

Other names

Gut microbiomeIntestinal floraColonic microfloraGut commensal microbiotaIntestinal microbiotaHuman intestinal microbiome

Modulation of microbial community composition, restoration of commensal diversity, production of bioactive metabolites like short-chain fatty acids, competitive exclusion of pathogens, and modulation of host immune responses (Nature Reviews Microbiology, 2019; Frontiers in Microbiology, 2021).