Microbiota-derived functional outputs

Microbiota-derived functional outputs represent the collective secretome and metabolome of the commensal microbiota, serving as the primary interface between the microbiome and host physiology (Nicholson et al., 2012). These outputs include a diverse range of molecules such as short-chain fatty acids (SCFAs), secondary bile acids, indole derivatives, and vitamins, which function as ligands for host receptors and substrates for metabolic enzymes (Fan & Pedersen, 2021). By interacting with host targets like G protein-coupled receptors (GPCRs) and nuclear receptors, these functional outputs regulate critical processes including energy harvest, glucose homeostasis, and immune cell differentiation (Koh et al., 2016). Dysregulation or dysbiosis of these outputs is a hallmark of various systemic and localized diseases, including metabolic syndrome, inflammatory bowel disease (IBD), and cardiovascular disease (Tang et al., 2019). Therapeutic strategies increasingly focus on modulating these outputs through dietary interventions, live biotherapeutics, or postbiotic administration of the metabolites themselves to restore host-microbe symbiosis (Cunningham et al., 2021). Furthermore, specific outputs like trimethylamine N-oxide (TMAO) have been identified as significant risk factors for atherosclerosis, highlighting the dual role of these molecules in health and disease.

Other names

Gut microbial metabolitesMicrobiome-derived metabolitesMicrobiota secretomeMicrobial functional outputsBioactive microbial products

Modulation of host physiology via activation of G protein-coupled receptors (e.g., GPR41, GPR43, GPR109A), activation of nuclear receptors (e.g., FXR, PXR, VDR), inhibition of histone deacetylases (HDACs), and signaling through the aryl hydrocarbon receptor (AhR).