Host-gut microbiota ecosystem

The host-gut microbiota ecosystem is a complex symbiotic network comprising trillions of microorganisms, including bacteria, viruses, fungi, and archaea, that reside within the human gastrointestinal tract [1]. This ecosystem functions as a virtual organ, performing vital roles in nutrient metabolism, vitamin synthesis, and the development and regulation of the host immune system [2, 3]. It maintains the integrity of the intestinal barrier and protects against pathogen colonization through competitive exclusion and the production of antimicrobial substances [4]. Disruptions to this delicate balance, known as dysbiosis, are implicated in numerous systemic and localized diseases, such as inflammatory bowel disease (IBD), obesity, type 2 diabetes, and Clostridioides difficile infection [5, 6]. Modern therapeutic strategies target this ecosystem using fecal microbiota transplants (FMT), probiotics, and engineered microbial consortia to restore a healthy microbial state [7]. Additionally, the gut microbiota significantly influences the pharmacokinetics and efficacy of various systemic drugs, including chemotherapeutic agents and immune checkpoint inhibitors [8]. Sources: [1] NIH Human Microbiome Project; [2] O'Hara & Shanahan (2006) EMBO Rep; [3] Belkaid & Hand (2014) Cell; [4] Buffie & Pamer (2013) Nat Rev Immunol; [5] Lynch & Pedersen (2016) NEJM; [6] Turnbaugh et al. (2006) Nature; [7] FDA (2022/2023) Rebyota/Vowst Approvals; [8] Gopalakrishnan et al. (2018) Science.

Other names

Gut microbiomeIntestinal microbiotaGut-host axisCommensal floraGastrointestinal ecosystem

Modulation of microbial composition and metabolic output (e.g., short-chain fatty acids) to restore host homeostasis and immune regulation.