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New study sheds light on the connection between the microbiome and kidney stones

New study sheds light on the connection between the microbiome and kidney stones
2023-12-20
(Press-News.org)  A new study from Lawson Health Research Institute and Western University published in the journal Microbiome has found changes in the microbiome in multiple locations in the body are linked to the formation of kidney stones.

The human microbiome comprises trillions of microorganisms, including healthy bacteria. In recent years, research has begun to uncover its role in health and numerous diseases.

The research team examined the gut, urinary and salivary microbiomes in 83 patients who had kidney stones and compared them to 30 healthy controls. They found changes in all three microbiomes were linked to kidney stone formation.

“Kidney stone disease has been rising in recent years, affecting roughly 10 per cent of people,” says Dr. Jeremy Burton, Lawson Scientist and Research Chair of Human Microbiome and Probiotics at St. Joseph’s Health Care London (St. Joseph’s). “While previous research has shown a connection between the gut microbiome and kidney stones in those who have taken antibiotics, we also wanted to explore the connection to other microbiomes in the hopes we can advance understanding and potential treatments.”

Study participants included people who had formed kidney stones, had not had antibiotic exposure in the last 90 days and were having the stones removed surgically at St. Joseph’s.

“Our testing – called shotgun metagenomic sequencing – allowed us to discover which bacteria were present in the gut and the genetic capabilities of those bacteria, or how it functions. We also did a simpler sequencing of the oral and urinary samples,” explains Dr. Kait Al, lead author on the study and Postdoctoral Research Fellow at Western’s Schulich School of Medicine & Dentistry.

Kidney stones are most commonly formed from calcium oxalate, which is a waste product produced by the body. Historically, it was thought people with specific gut microbes, like one bacterium called Oxalobacter formigenes that breaks down oxalate, were less likely to form kidney stones. This study suggests there are other factors.

“It’s a more complex story. The microbes form a kind of network that’s stable and beneficial in healthy people, but in those with kidney stones, that network is broken down. They’re not producing the same vitamins and useful metabolites, not just in the gut but also in the urinary tract and oral cavity,” Dr. Al explains.

There was also evidence that those with kidney stones had been exposed to more antimicrobials, as they had more antibiotic-resistant genes.

“We found not only that those who got kidney stones had an unhealthy microbiome, including a gut microbiome that was more likely to excrete toxins to the kidneys, but also that they were antibiotic resistant,” explains Dr. Burton, also an Associate Professor in the Department of Microbiology and Immunology at Schulich Medicine & Dentistry.  

The research team says that although more research is needed, these initial findings shed light on the overall importance of a person’s microbiome and keeping it as healthy as possible, with a microbiome-friendly diet and minimal antibiotic use potentially part of the solution.

The study was funded in part through the Weston Foundation and supported by the American Urological Association.

END

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[Press-News.org] New study sheds light on the connection between the microbiome and kidney stones