Host mucosal and immune environment

The host mucosal and immune environment is a specialized physiological system comprising the epithelial barriers and underlying immune components of the respiratory, gastrointestinal, and urogenital tracts (Mowat & Agace, 2014, Nature Reviews Immunology). It serves as the primary interface between the host and the external world, balancing the need for nutrient absorption or gas exchange with the necessity of defending against pathogens (Peterson & Artis, 2014, Nature Reviews Immunology). This environment includes the mucosa-associated lymphoid tissue (MALT), which contains a diverse array of immune cells such as T cells, B cells, and dendritic cells, as well as biochemical defenses like secretory IgA and antimicrobial peptides (Brandtzaeg, 2011, Trends in Immunology). Dysregulation of this environment, characterized by a breakdown in barrier integrity or a loss of immunological tolerance to commensal microbes, is a hallmark of diseases such as inflammatory bowel disease, celiac disease, and chronic obstructive pulmonary disease (Neurath, 2014, Nature Reviews Immunology). Pharmacological intervention in this environment typically involves the use of biologics to block specific inflammatory pathways, such as TNF-alpha or integrins, or anti-inflammatory agents to restore homeostasis and promote mucosal healing (Feagan et al., 2013, New England Journal of Medicine).

Other names

Mucosal immune systemMucosa-associated lymphoid tissueMALTMucosal barrierGastrointestinal immune environmentMucosal homeostasis

Modulation of leukocyte trafficking to mucosal sites, neutralization of pro-inflammatory cytokines, stabilization of the epithelial barrier, and induction of immunological tolerance.