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  • ‘Snot wars’ study yields new class of drugs – BBC News
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‘Snot wars’ study yields new class of drugs – BBC News

Editor July 28, 2016

A new class of antibiotics has been discovered by analysing the bacterial warfare taking place up people’s noses, scientists report.

Tests reported in the journal Nature found the resulting drug, lugdunin, could treat superbug infections.

The researchers, at the University of Tubingen in Germany, say the human body is an untapped source of new drugs.

The last new class of the drugs to reach patients was discovered in the 1980s.

Nearly all antibiotics were discovered in soil bacteria, but the University of Tubingen research team turned to the human body.

Our bodies might not look like a battlefield, but on a microscopic level a struggle for space and food is taking place between rival species of bacteria.

One of the weapons they have long been suspected of using is antibiotics.

Among the bugs that like to invade the nose is Staphylococcus aureus, including the dreaded superbug strain MRSA.

It is found in the noses of 30% of people.

The scientists discovered that people with the rival bug Staphylococcus lugdunensis in their nostrils were less likely to have S. aureus.

The German team used various strains of genetically-modified S. lugdunensis to work out the crucial piece of genetic code that allowed it to win the fight to live among your nose hairs.

They eventually pinpointed a single crucial gene that contained the instructions for building a new antibiotic, which they named lugdunin.

Tests on mice showed lugdunin could treat superbug infections on the skin including MRSA, as well as Enterococcus infections.

One of the researchers, Dr Bernhard Krismer, said: “Some of the animals were completely clear, no single cell of the bacterium was detectable.

“Others were reduced, but still contained some bacteria and we also saw that the compound penetrated the tissue and acted on the deeper layer of the skin.”

It will take years of testing before lugdunin could reach patients and it may not prove to be successful.

But new antibiotics are desperately needed as doctors face the growing challenge of infections that resist current drugs and could become untreatable.

Fellow researcher Prof Andreas Peschel said the body could be mined for new antibiotics.

“Lugdunin may be the first example of such an antibiotic, we have started a screening programme,” he said.

And he even believes that people could one day be infected with genetically-modified bacteria to fight their infections.

He argued: “By introducing the lugdunin genes into a completely innocuous bacterial species we hope to develop a new preventive concept of antibiotics that can eradicate pathogens.”

Prof Kim Lewis and Dr Philip Strandwitz, from the antimicrobial discovery centre at Northeastern University in the US, commented: “It may seem surprising that a member of the human microbiota – the community of bacteria that inhabits the body – produces an antibiotic.

“However, the microbiota is composed of more than a thousand species, many of which compete for space and nutrients, and the selective pressure to eliminate bacterial neighbours is high.”

Prof Colin Garner, the head of Antibiotic Research UK, told the BBC: “Altering the balance of bacteria in our bodies through the production of natural antibiotics could eventually be exploited to fight off bacterial infections.

“It is possible that this report will be the first of many demonstrating that bacteria in our bodies can produce novel antibiotics with new chemical structures.

“Alongside a report that men with beards have fewer pathogens including MRSA on their faces than clean-shaven men, it seems the paper identifying lugdunin should be viewed alongside facial hair as a preventer of infection.”(James Gallagher)

Link: http://www.bbc.com/news/health-36910766

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