Casein-enhanced uptake and disease-modifying bioactivity of ingested extracellular vesicles.

Extracellular vesicles (EVs) from cardiac stromal cells, developed as therapeutic candidates, improve dystrophic muscle function when administered parenterally, but oral delivery remains untested. We find that casein, the dominant protein in breast milk, enhances the uptake and bioactivity of ingested heart-derived EVs, altering gene expression in blood cells and enhancing muscle function in mice with muscular dystrophy. Thus, EVs, administered orally, are absorbed and exert disease-modifying bioactivity .