Intestinal Development and Barrier Function in Weaned Pigs

Weaning represents a critical transition in swine production, imposing dietary, environmental and social challenges that reshape intestinal morphology and function. In the days following separation from the sow, piglets typically exhibit villus atrophy, crypt hyperplasia and reduced digestive enzyme activity. Concurrently, the epithelial barrier—comprising a single layer of enterocytes linked by tight junctions—becomes more permeable, increasing the risk of pathogen translocation and diarrhoeal disease. Restoration of barrier integrity relies on coordinated proliferation and differentiation of crypt‐located stem cells, coordinated migration along the crypt–villus axis and reassembly of intercellular junctional complexes. At the same time, maturation of mucosal immunity, including secretory immunoglobulin A production and regulated inflammatory signalling, helps to counterbalance weaning‐induced stress. Nutritional strategies that modulate redox balance, support epithelial regeneration or reshape the gut microbiota have been shown to mitigate weaning‐associated growth checks. Understanding the interplay between metabolic demands, cellular turnover and barrier maintenance not only underpins improved piglet performance but also informs fundamental principles of mucosal biology in mammals.

Research from Nature Portfolio

Proteomic analyses of neonatal piglet intestines have revealed that epithelial cells at the villus tip upregulate pathways for glucose, amino acid and fatty acid metabolism, supporting energy‐intensive processes of nutrient absorption and barrier renewal. In contrast, stem and progenitor cells in the crypt show distinct profiles, reflecting a shift towards biosynthetic and proliferative programmes during maturation. Complementary work has examined the impact of weaning on crypt epithelial cells, demonstrating that abrupt dietary change transiently suppresses mTOR signalling and downregulates proteins involved in macromolecular organisation and oxidative phosphorylation. These alterations coincide with increased markers of cell cycle arrest and protein catabolism, highlighting how metabolic reprogramming in crypts contributes to slowed epithelial turnover and barrier compromise in the early post‐weaning phase.

Intestinal Development and Barrier Function in Weaned Pigs publication trend

The graph below shows the total number of articles in intestinal development and barrier function in weaned pigs across all publications each year (not limited to Nature Index journals).

Technical terms

Crypt–villus axis: The spatial gradient from stem‐cell‐rich crypt bases to differentiated villus tips where nutrient absorption and barrier renewal occur.

Tight junctions: Multiprotein complexes between enterocytes that regulate paracellular permeability and maintain epithelial barrier integrity.

Paracellular permeability: Movement of water and solutes across the intestinal epithelium through intercellular spaces rather than through cells.

Intestinal stem cells (ISCs): Lgr5+ progenitor cells located in the crypt that give rise to all differentiated epithelial cell types.

Oxidative stress: Imbalance between production of reactive oxygen species and the capacity of antioxidant systems to neutralise them, leading to cellular damage.

References

1. Dietary Taurine Improves Growth Performance and Intestine Health via the GSH/GSSG Antioxidant System and Nrf2/ARE Signaling Pathway in Weaned Piglets. Antioxidants (2023).
2. Role of the GLP2–Wnt1 axis in silicon-rich alkaline mineral water maintaining intestinal epithelium regeneration in piglets under early-life stress. Cellular and Molecular Life Sciences (2024).
3. Prebiotic galactooligosaccharide improves piglet growth performance and intestinal health associated with alterations of the hindgut microbiota during the peri-weaning period. Journal of Animal Science and Biotechnology (2024).
4. Weaning stress and intestinal health of piglets: A review. Frontiers in Immunology (2022).
5. Energy metabolism in intestinal epithelial cells during maturation along the crypt-villus axis. Scientific Reports (2016).
6. Effects of weaning on intestinal crypt epithelial cells in piglets. Scientific Reports (2016).