Innate immune receptors in the gastrointestinal mucosa (GI-IIRs)

Innate immune receptors in the gastrointestinal mucosa, collectively known as pattern recognition receptors (PRRs), are essential sensors that monitor the intestinal environment for microbial threats and tissue damage (Abreu, 2010, Nature Reviews Immunology). These receptors, which include Toll-like receptors (TLRs), NOD-like receptors (NLRs), and C-type lectin receptors (CLRs), are expressed by both intestinal epithelial cells and underlying immune cells such as macrophages and dendritic cells (Mogensen, 2009, Clinical Microbiology Reviews). Their primary function is to recognize conserved molecular motifs from pathogens (PAMPs) or damaged host cells (DAMPs), initiating signaling cascades that lead to the production of cytokines, chemokines, and antimicrobial peptides (Santaolalla & Abreu, 2012, Gastroenterology Research and Practice). In a healthy gut, these receptors maintain a delicate balance between tolerance to commensal bacteria and active defense against pathogens. Dysregulation of these innate sensing pathways is a major driver of chronic inflammatory conditions, most notably inflammatory bowel diseases (IBD) like Crohn's disease and ulcerative colitis (Hugot et al., 2001, Nature). Consequently, these receptors and their downstream signaling components are significant therapeutic targets, with various agonists and antagonists under investigation to either suppress pathological inflammation or boost protective mucosal immunity.

Other names

Pattern recognition receptors (PRRs)Mucosal innate immune receptorsGastrointestinal pattern recognition receptorsIntestinal innate immune sensors

Modulation of innate immune signaling pathways, such as NF-κB and MAPK, through the activation or inhibition of specific pattern recognition receptors to regulate mucosal inflammation and restore intestinal barrier function.