Gut microbiota and immune milieu

The gut microbiota and immune milieu represent a complex symbiotic ecosystem comprising trillions of microorganisms and the host's mucosal immune system. This biological environment is central to human health, performing essential functions such as the fermentation of non-digestible carbohydrates into short-chain fatty acids, synthesis of essential vitamins, and the training of the host immune system to distinguish between commensals and pathogens [1][2]. Dysbiosis, or the pathological imbalance of this microbial community, is linked to a wide array of conditions, including Clostridioides difficile infections, inflammatory bowel disease (IBD), and metabolic disorders like obesity [3]. Therapeutic interventions target this milieu through narrow-spectrum antibiotics, fecal microbiota transplants (FMT), or live biotherapeutic products (LBPs) to restore ecological homeostasis [4]. By influencing the gut-immune axis, these treatments can reduce systemic inflammation and have been shown to enhance the efficacy of other therapies, such as cancer immunotherapies [5]. Consequently, the gut microbiota is increasingly viewed as a modifiable therapeutic target for both local and systemic diseases [3][5]. [1] NIH Human Microbiome Project. [2] Belkaid & Hand (2014) Science. [3] Fan & Pedersen (2021) Nature Reviews Microbiology. [4] Khanna et al. (2022) Nature Reviews Gastroenterology & Hepatology. [5] Gopalakrishnan et al. (2018) Cancer Cell.

Other names

Gut microbiomeIntestinal floraGut-immune axisGastrointestinal microbiotaCommensal microbiota

Restoration of microbial diversity, competitive inhibition of pathogenic colonization, modulation of mucosal immune cell signaling (e.g., Treg induction), and production of bioactive metabolites such as short-chain fatty acids (SCFAs) [2][4].