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In vitro study finds digested formula, but not breast milk, is toxic to cells
Date:12/10/2012

Free fatty acids created during the digestion of infant formula cause cellular death that may contribute to necrotizing enterocolitis, a severe intestinal condition that is often fatal and occurs most commonly in premature infants, according to a study by University of California, San Diego bioengineers. Their report, which was based on in vitro tests comparing the digestion of fresh human breast milk and nine different infant formulas, was published online in the journal Pediatric Research.

Scientists have long known that premature infants fed formula are more likely to develop necrotizing enterocolitis than those fed breast milk. The condition is the leading cause of death from gastrointestinal diseases in premature infants, but the underlying mechanism has not been understood. Alexander Penn, a research scientist working in the Microcirculation Laboratory of bioengineering Professor Geert Schmid-Schnbein from the UC San Diego Jacobs School of Engineering, believes they have come closer to an answer.

Penn and others had previously determined that the partially digested food in a mature, adult intestine is capable of killing cells, due to the presence of free fatty acids which have a "detergent" capacity that damages cell membranes. The intestines of healthy adults and older children have a mature mucosal barrier that may prevent damage due to free fatty acids. However, the intestine is leakier at birth, particularly for preterm infants, which could be why they are more susceptible to necrotizing enterocolitis.

Therefore, the researchers wanted to know what happens to breast milk as compared to infant formula when they are exposed to digestive enzymes. They "digested," in vitro, infant formulas marketed for full term and preterm infants as well as fresh human breast milk using pancreatic enzymes or fluid from an intestine. They then tested the formula and milk for levels of free fatty acids. They also tested whether these
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Contact: Catherine Hockmuth
chockmuth@ucsd.edu
858-822-1359
University of California - San Diego
Source:Eurekalert  

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In vitro study finds digested formula, but not breast milk, is toxic to cells
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