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  • Sugar from breast milk ...

Sugar from breast milk effective for treatment, prevention of infections in newborns: Study

Hina ZahidBy Hina ZahidPublished On 2021-08-24T09:00:39+05:30  |  Updated On 2021-08-24T09:01:09+05:30
Sugar from breast milk effective for treatment, prevention of infections in newborns: Study

USA: bacteria(HMOs) can help in the prevention of GBS infections in human cells and tissues and in mice, according to a recent study. The findings imply that someday HMOs can replace antibiotics for the treatment of infections in infants and adults. HMOs are short strings of sugar molecules abundant in breast milk. Bacteria known as group B Streptococcus (GBS) are a common cause of...

USA: bacteria(HMOs) can help in the prevention of GBS infections in human cells and tissues and in mice, according to a recent study. The findings imply that someday HMOs can replace antibiotics for the treatment of infections in infants and adults. 

HMOs are short strings of sugar molecules abundant in breast milk. Bacteria known as group B Streptococcus (GBS) are a common cause of blood infections, meningitis, and stillbirth in newborns. 

The study findings were presented at the fall meeting of the American Chemical Society (ACS) -- a hybrid meeting being held virtually and in-person Aug. 22-26. The meeting features more than 7,000 presentations on a wide range of science topics.

"Our lab has previously shown that mixtures of HMOs isolated from the milk of several different donor mothers have antimicrobial and antibiofilm activity against GBS," says Rebecca Moore, who is presenting the work at the meeting. "We wanted to jump from these in vitro studies to see whether HMOs could prevent infections in cells and tissues from a pregnant woman, and in pregnant mice." Moore is a graduate student in the labs of Steven Townsend, Ph.D., at Vanderbilt University and Jennifer Gaddy, Ph.D., at Vanderbilt University Medical Center.

According to the U.S. Centers for Disease Control and Prevention, about 2,000 babies in the U.S. get GBS each year, and 4-6% of them die from it. The bacteria are often transferred from mother to baby during labor and delivery. An expectant mother who tests positive for GBS is usually given intravenous antibiotics during labor to help prevent early-onset infections, which occur during the first week of life. Interestingly, the incidence of late-onset infections (which happen from one week to three months after birth) is higher in formula-fed than breastfed infants, which suggests that factors in breast milk could help protect against GBS. If so, the sugars could perhaps replace antibiotics, which, in addition to killing beneficial bacteria, are becoming less effective because of the rise in antibiotic resistance.

The researchers studied the effects of combined HMOs from several mothers on GBS infection of placental immune cells (called macrophages) and of the gestational membrane (the sac surrounding the fetus). "We found that HMOs were able to completely inhibit bacterial growth in both the macrophages and the membranes, so we very quickly turned to looking at a mouse model," Moore says. They examined whether HMOs could prevent a GBS infection from spreading through the reproductive tract of pregnant mice. "In five different parts of the reproductive tract, we saw significantly decreased GBS infection with HMO treatment," Moore notes.

To figure out which HMOs and other oligosaccharides have these antimicrobial effects and why, the researchers set up an artificial two-species microbiome with GBS and the beneficial Streptococcus salivarius species growing in a tissue culture plate, separated by a semi-permeable membrane. Then, the researchers added oligosaccharides that are commonly added to infant formula, called galacto-oligosaccharides (GOS), which are derived from plants. In the absence of sugar, GBS suppressed the growth of the "good" bacteria, but GOS helped this beneficial species grow. "We concluded that GBS is producing lactic acid that inhibits growth, and then when we add the oligosaccharide, the beneficial species can use it as a food source to overcome this suppression," Moore explains.

Somewhat surprisingly, the first HMOs they've tested in the system did not have this effect, but Townsend says it's likely that one or more of the over 200 unique sugars in human milk will show activity in the artificial microbiome assay. The team plans to find out. The reason HMOs can treat and prevent GBS infection is likely two-fold, the researchers say: They act as an anti-adhesive by preventing pathogens from sticking to tissue surfaces and forming a biofilm, and they could act as a prebiotic by supporting the growth of good bacteria.

"HMOs have been around as long as humans have, and bacteria have not figured them out. Presumably, that's because there are so many in milk, and they're constantly changing during a baby's development," Townsend says. "But if we could learn more about how they work, it's possible that we could treat different types of infections with mixtures of HMOs, and maybe one day this could be a substitute for antibiotics in adults, as well as babies."


newborn infection breast milk American Chemical Society 
Source : ACS meeting
Hina Zahid
Hina Zahid

    Hina Zahid Joined Medical Dialogue in 2017 with a passion to work as a Reporter. She coordinates with various national and international journals and association and covers all the stories related to Medical guidelines, Medical Journals, rare medical surgeries as well as all the updates in the medical field. Email: editorial@medicaldialogues.in. Contact no. 011-43720751

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