Cave bacteria could control superbugs

2016-03-29 22:42
(Picture: Supplied)

(Picture: Supplied)

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Kamloops - Sometimes you find what you are looking for in the unlikeliest of places - Canadian microbiologist Naowarat (Ann) Cheeptham certainly does.

She is a leading researcher into how to best battle a growing number of antibiotic resistant superbugs, and she is looking for answers everywhere - from deep subterranean caves to the local sewage treatment plant in her home town of Kamloops, British Columbia.

Cheeptham's most recent breakthrough came after she met one of Canada's top cave explorers: Nick Vieira.

Naturally enough, Vieira spends a lot of time underground - often kilometres deep in twisted caverns cut off from the surface by underground rivers and artesian wells.

The soil and dirt he finds in those subterranean nooks are fuelling Cheeptham's search for treatments to kill superbugs.

"We find microbes in that soil," she says. "Pristine organisms that haven't contacted surface life in any way. When we put them in contact with drug resistance bacteria, we get fascinating results."

The discovery of penicillin in 1928 sparked a revolution in medicine.

Bacterial infection, a leading cause of death, could suddenly be prevented with a simple drug. Antibiotics followed, attacking harmful microbes even more effectively.

But now many of these bacteria have evolved defences against existing drugs, while the search for their replacements has not been going well - thousands die every year from infections that used to be treatable.

Undiscovered world

Meanwhile, pharmaceutical companies are reluctant to spend money developing new antibiotics that might not earn as much in the market as Viagra or anti-cholesterol statins.

In her lab at Kamloops' Thomson Rivers University, Cheeptham and her research assistants hold up petri dishes against a light table. They point at circular patterns surrounded by clear fluid.

"That's where the cave bacteria are killing the superbugs," Cheeptham says. "It's very promising."

Vieira is happy that his efforts are producing promise in the lab.

"It's a whole, undiscovered world down there," he says, standing beneath a cliff-side cave mouth near Canmore, Alberta, in the Canadian Rocky Mountains.

"It's the last frontier on the planet - under the planet - and working with scientists helps you discover so much about it," adds Vieira, who is now delivering bags of cave soil to microbiologists in the US too.

In a video on his website, he and a colleague scrape dirt from the sides of a Rocky Mountain cave called Raspberry Rising, where most of the best samples have come from.

In his waterproof cave suit and head lamp, Vieira is visibly gleeful as he fills a plastic bag with clay.

"High school science, I hated it, but here I am. Who'd have ever thought I'd be learning so much about the world," he says, his words echoing off the stone walls.

Back on the surface, the search takes another direction.

Bacteriophages

Cheeptham and her graduate student, Emma Persad, are delving into medical history, as they plumb the sewage lagoon of a Kamloops water treatment plant - in the vials of murky water, there is quite possibly another option to defeat superbugs.

Bacteriophages, also known as phages, are a type of virus with one essential quality: they are deadly to certain forms of bacteria.

Phages were discovered by researchers in France and England during World War One and they became a preferred form of treatment for infection in the former USSR and its satellite countries in Eastern Europe. They are still in use in those areas today.

But thanks to the discovery of antibiotics, which are easier to use and affect more species of bacteria, phages fell out of favour elsewhere.

Persad and Cheeptham are determined to change that. They are working together to convince North Americans and Western Europeans that human and animal waste contains life-saving qualities.

Persad says they are battling western prejudice, not science, because the effectiveness of phages is well known already.

"In North America, we just don't like the world 'virus,'" she says. "We don't like to think about putting a virus into ourselves to fight a bacterial infection.

Form of virus

"Antibiotics affect all bacteria. They kill even good bacteria in the body but if you use specific bacteriophages then only the bad bacteria, those causing illness, are killed. The good bacteria - in your stomach and intestines - aren't effected at all.” 

Best of all, because phages are a form of virus, there can be no resistance to them. 

"All that's holding us back is our own reluctance," Persad says.

To Cheeptham, it is all a matter of having as many medical options as possible to save lives.

"I believe that we still need to widen our tool box - if you think of antibiotics [as] in a tool box, we are running out of tools and we need to fill this box. And where should we go to find this? Anywhere we have to."

Whether it is thousands of metres underground, or in the pungent shores of a sewage lagoon, it is all in the name of saving lives.

Read more on:    canada  |  health  |  research

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