Claudin-2 protein helps infant mice absorb more calcium from breast milk

A key protein known as claudin-2, which lines the intestinal epithelial cells of infant mice, helps them absorb more calcium from breast milk, according to a new study in the journal Function. Researchers from the University of Alberta in Canada also discovered a hormone in breast milk - called epidermal growth factor - causes the intestine to produce more claudin-2. As a result, epidermal growth factor in breast milk enhances calcium absorption in young mice.

Infants and children need to absorb minerals such as calcium from their diet to build strong bones during growth and development. Babies born prematurely are at risk of low bone mineralization.

This study provides key knowledge of how infants meet their high calcium requirements to enable growth, and how a factor in breast milk helps increase calcium absorption. These findings contribute a molecular understanding that could be potentially manipulated to improve bone health."

R. Todd Alexander, PhD, first author of the study