Physical and Biological Barriers at the Interface Between the Gut Microbiome and the Immune System

The gut environment is fundamental to the modulation of innate and adaptive immunity, not only in the intestinal mucosa, but systemically. Immune cells constantly circulate through the intestinal tissue and gut-associated lymphoid tissue (GALT), where their phenotype and function are regulated by several factors, including but not limited to the commensal gut microbiota.