1502-Gut Microbiome Protection Against Respiratory Illness

This research reveals how osteopontin (OPN), a bioactive protein found in breast milk, provides critical protection against severe lower respiratory infections in newborns. By utilizing mouse models, the study demonstrates that milk-derived OPN shapes the infant gut microbiome, specifically increasing the abundance of Lactobacillaceae. These beneficial bacteria produce the metabolite 3-phenyllactic acid (PLA), which travels through the blood to activate the PPARγ receptor in the lungs and liver. This biological pathway triggers dendritic cell hematopoiesis, ensuring the respiratory system is populated with immune cells necessary for disease tolerance. Ultimately, the findings suggest that supplementing infant formula with OPN or its related metabolites could prevent life-threatening lung infections and long-term respiratory issues.

References:

• Howard D R, Rashid R B, Ahmed T, et al. Milk osteopontin alters the infant microbiome to drive DC hematopoiesis and disease tolerance[J]. Cell, 2026.