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Skin Lotions Keep Disease-Causing Bacteria at Bay

by Bidita Debnath on March 1, 2017 at 11:53 PM
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 Skin Lotions Keep Disease-Causing Bacteria at Bay

Two new antibiotics that specifically abolished a potentially disease-causing form of Staphylococcus aureus were discovered in the secretions of innocuous bacteria that naturally occupy people's skin, reports a new study.

l Personalized lotions containing the "friendly" bacteria protected against S. aureus colonization for five patients with Atopic Dermatitis (AD) - a condition characterized by frequent skin infections that afflicts up to 20% of the population at some point in their lives.

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Certain strains of beneficial bacteria even suppressed the growth of methicillin-resistant Staphylococcus aureus (MRSA), a difficult-to-treat and sometimes lethal pathogen. Here, Teru Nakatsuji and colleagues isolated two novel antimicrobial peptides (AMPs) from the protective microbes, a type of antibacterial agent also produced by the human immune system.

The bacterial AMPs were more effective at eliminating S. aureus than their human counterparts alone, and when administered in combination both agents demonstrated enhanced results. What's more, the AMP-generating bacteria did not inhibit the growth of other organisms associated with healthy skin, including Propionibacterium acnes, Staphylococcus epidermidis and Corynebacterium minutissimum.
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Knowledge of the specific microbial genes encoding AMPs allowed the scientists to identify small numbers of guardian bacteria on AD patients' skin. They developed unique lotions containing bacteria isolated from each individual, which prevented those patients from becoming colonized by S. aureus.

This selective intervention is already approved by the U.S. Food and Drug Administration, with a clinical trial currently underway. The approach could prevent skin infections without the need for broad-spectrum antibiotics, which the authors say might do more harm than good by also killing off protective members of the skin microbiota.

Source: Eurekalert
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