Host gastric and mucosal immune system

The host gastric and mucosal immune system is a complex, integrated network of physical barriers, specialized immune cells, and signaling molecules that protect the gastrointestinal tract from pathogens while maintaining tolerance to harmless antigens (Mowat & Agace, 2014, Nat Rev Immunol). It comprises the gut-associated lymphoid tissue (GALT), which includes Peyer's patches and mesenteric lymph nodes, and utilizes unique mechanisms such as the production of secretory IgA to neutralize threats at the mucosal surface (StatPearls, 2023). This system is essential for preventing infections like Helicobacter pylori and managing the inflammatory response to the gut microbiota (NIH, 2022). Dysregulation of these mucosal immune processes is a hallmark of diseases such as Crohn's disease, ulcerative colitis, and gastric cancer. While the system as a whole is not a single molecular target, it contains numerous specific proteins—such as TNF-alpha, integrins, and interleukins—that are targeted by modern biologics and small molecules to treat chronic inflammation (PubChem). Effective therapeutic intervention requires balancing the suppression of pathological inflammation with the preservation of protective immunity against infections.

Other names

Gastric mucosal immune systemGut-associated lymphoid tissueGALTMucosa-associated lymphoid tissueMALTGastrointestinal immune system

Therapeutic strategies involve the modulation of lymphocyte trafficking via integrin antagonism, neutralization of pro-inflammatory cytokines like TNF-alpha or IL-12/23, and inhibition of intracellular signaling through Janus kinases to restore mucosal homeostasis.