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Summary: Glycerol monolaurate (GML), a compound found in human breast milk, fights against the effects of harmful bacteria while allowing beneficial bacteria to thrive. GML also inhibits inflammation in epithelial cells, helping to prevent both bacterial and viral infections of the gut. GML is 200 times higher in human breast milk than cow milk. Researchers propose adding GML to infant formula and cow milk given to small children.
Source: National Jewish Health
Researchers at National Jewish Health and the University of Iowa have identified a compound in human breast milk that fights infections by harmful bacteria while allowing beneficial bacteria to thrive. Human breast milk has more than 200 times the amount of glycerol monolaurate (GML) than is found in cows’ milk. Infant formula has none. GML is inexpensive to manufacture. Future research will determine if GML could be a beneficial additive to cow’s milk and infant formula.
“Our findings demonstrate that high levels of GML are unique to human breast milk and strongly inhibit growth of pathogenic bacteria,” said Donald Leung, MD, PhD, professor of pediatrics at National Jewish Health and senior author on a paper in Scientific Reports.
‘While antibiotics can fight bacterial infections in infants, they kill the beneficial bacteria along with the pathogenic ones,” said Patrick Schlievert, PhD, professor of microbiology and immunology at the University of Iowa Carver College of Medicine and first author on the Scientific Reports paper. “GML is much more selective, fighting only the pathogenic bacteria while allowing beneficial species to thrive. We think GML holds great promise as a potential additive to cows’ milk and infant formula that could promote the health of babies around the world.”
After determining that human breast milk contains much higher levels of GML than does cows’ milk, the researchers showed that human breast milk inhibits the growth of the pathogenic bacteria Staphylococcus aureus, Bacillus subtilis and Clostridium perfringens, while neither cows’ milk nor infant formula had any effect. Human breast milk did not inhibit the growth of the beneficial bacteria Enterococcus faecilis. Babies fed on human breast milk have high levels of beneficial bifidobacteria, lactobacilli and enterococci bacterial species.
When researchers remove the GML from human breast milk, it lost its antimicrobial activity against S. aureus. When they added GML to cows’ milk, it became antimicrobial.
The researchers also showed that GML inhibits inflammation in epithelial cells, which line the gut and other mucosal surfaces. Inflammation can damage epithelial cells and contribute to susceptibility to both bacterial and viral infections.
Drs. Schlievert and Leung have applied for a patent for the use of GML as a beneficial additive to cows’ milk and infant formula.
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Source: National Jewish Health Media Contacts: William Allstetter – National Jewish Health Image Source: The image is adapted from the National Jewish Health news release.
Original Research: Open access “Glycerol Monolaurate Contributes to the Antimicrobial and Anti-inflammatory Activity of Human Milk”. Patrick M. Schlievert, Samuel H. Kilgore, Keun Seok Seo & Donald Y. M. Leung. Scientific Reports doi:10.1038/s41598-019-51130-y.
Glycerol Monolaurate Contributes to the Antimicrobial and Anti-inflammatory Activity of Human Milk
Human milk has antimicrobial compounds and immunomodulatory activities. We investigated glycerol monolaurate (GML) in human milk versus bovine milk and infant formula for antimicrobial and anti-inflammatory activities. Human milk contained approximately 3000 µg/ml of GML, compared to 150 μg/ml in bovine milk and none in infant formula. For bacteria tested (Staphylococcus aureus, Bacillus subtilis, Clostridium perfringens, Escherichia coli), except Enterococcus faecalis, human milk was more antimicrobial than bovine milk and formula. The Enterococcus faecalis strain, which was not inhibited, produced reutericyclin, which is an analogue of GML and functions as a growth stimulant in bacteria that produce it. Removal of GML and other lipophilic molecules from human milk by ethanol extraction resulted in a loss of antibacterial activity, which was restored by re-addition of GML. GML addition caused bovine milk to become antimicrobial. Human milk but not bovine milk or formula inhibited superantigen and bacterial-induced IL-8 production by model human epithelial cells. GML may contribute beneficially to human milk compared to bovine milk or infant formula.
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