Immune Development and Gut Maturation in Early Life
Summary
Early life represents a critical window during which the gastrointestinal tract and the immune system co-develop in a tightly coordinated manner. At birth, the intestinal barrier exhibits high permeability that gradually declines as specialised epithelial cells replace foetal-type enterocytes, reducing macromolecular passage. Concurrently, exposure to maternal antibodies and dietary antigens through breast milk, together with sequential colonisation by commensal bacteria, drives the maturation of mucosal lymphoid tissues. This process shapes immune tolerance to dietary and microbial antigens, supports the emergence of secretory immunoglobulin A, and establishes regulatory pathways that safeguard against excessive inflammation. Disruptions to the timing or balance of epithelial maturation, microbial succession or immune signalling—whether by preterm birth, antibiotic exposure or altered nutrition—can predispose infants to infection, allergic disorders and long-term metabolic dysregulation. Advances in understanding the molecular and cellular mechanisms of early gut-immune interplay have underpinned novel nutritional and microbial interventions aimed at bolstering mucosal defences, optimising vaccine responses and reducing the global burden of paediatric gastrointestinal and immune-mediated diseases.
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Immune Development and Gut Maturation in Early Life publication trend
The graph below shows the total number of articles in immune development and gut maturation in early life across all publications each year (not limited to Nature Index journals).
Technical terms
Gut microbiota: The community of microorganisms inhabiting the gastrointestinal tract that influence digestion, barrier function and immune maturation.
FcRn (neonatal Fc receptor): An epithelial receptor that binds immunoglobulin G and mediates its trans-cellular transport, enabling passive antibody transfer.
Synbiotic: A combined formulation of prebiotics and probiotics designed to synergistically promote gut microbial balance and host health.
Secretory IgA: The predominant antibody isotype in mucosal secretions that neutralises pathogens and supports microbial homeostasis.
Mucosal immunity: Immune defence mechanisms operating at epithelial surfaces, involving specialised lymphoid tissues and secreted immunoglobulins.
References
- Impact of maternal Bifidobacterium breve M-16V and scGOS/lcFOS supplementation during pregnancy and lactation on the maternal immune system and milk composition. Frontiers in Immunology (2024).
- Maternal Synbiotic Supplementation with B. breve M-16V and scGOS/lcFOS Shape Offspring Immune Development and Gut Microbiota at the End of Suckling. Nutrients (2024).
- Early flora colonization affects intestinal immunoglobulin G uptake in piglets, which may be mediated by NF-κB-FcRn pathway. Frontiers in Microbiology (2023).
- The Immature Gut Barrier and Its Importance in Establishing Immunity in Newborn Mammals. Frontiers in Immunology (2020).
- Maturation of the Intestinal Epithelial Barrier in Neonatal Rats Coincides with Decreased FcRn Expression, Replacement of Vacuolated Enterocytes and Changed Blimp-1 Expression. PLOS ONE (2016).
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