Microbiome and mucosal immune ecosystem

The microbiome and mucosal immune ecosystem refers to the intricate, bidirectional relationship between the diverse community of commensal microorganisms and the host's immune system at mucosal interfaces, such as the gut, lungs, and skin. This ecosystem plays a fundamental role in educating the immune system, maintaining epithelial barrier integrity, and regulating metabolic processes through the production of metabolites like short-chain fatty acids (SCFAs) [Belkaid & Hand, 2014; Science]. It is essential for distinguishing between harmless commensals and potential pathogens, thereby preventing unnecessary inflammatory responses and maintaining homeostatic balance [Hooper et al., 2012; Science]. Dysfunction within this ecosystem, often termed dysbiosis, is a hallmark of various diseases, including inflammatory bowel disease (IBD), allergies, and metabolic syndrome, and can even influence the efficacy of systemic therapies like cancer immunotherapy [Round & Mazmanian, 2009; Nat Rev Immunol]. Therapeutic strategies targeting this system range from direct microbial replacement, such as fecal microbiota transplantation (FMT), to pharmacological agents that modulate mucosal immune signaling or barrier function [Lynch & Pedersen, 2016; NEJM]. Understanding this ecosystem is vital for developing precision medicine approaches that leverage the host-microbe interface to treat chronic inflammatory and autoimmune conditions [NIH Human Microbiome Project].

Other names

Gut-immune axisMucosal microbiota-immune systemIntestinal microbiome-immune interfaceCommensal-immune crosstalkMucosal immune system

Modulation of microbial composition and diversity, regulation of mucosal T-cell differentiation (specifically the Treg/Th17 balance), production of immunomodulatory metabolites such as short-chain fatty acids (SCFAs), and reinforcement of the intestinal epithelial barrier to prevent translocation of pro-inflammatory microbial products.