Kidney stones partially dissolve naturally

Scientists have found that kidney stones partially dissolve and regrow again as they form, challenging previously held theories as well as raising hopes for new treatment.

The findings showed that kidney stones are built up in calcium-rich layers that resemble other mineralisations in nature, such as those forming coral reefs.

This contradicts the widely held notion that kidney stones are homogenous rocks that never dissolve and are different from all other rocks in nature, said lead author of the study.

"Contrary to what doctors learn in their medical training, we found that kidney stones undergo a dynamic process of growing and dissolving. 

"This means that one day we may be able to intervene to fully dissolve the stones right in the patient's kidney, something most doctors today would say is impossible," the rsearcher said.

The research, published in the journal , demonstrated that "instead of being worthless crystalline lumps, kidney stones are a minute-by-minute record of the health and functioning of a person's kidney".

"Before this study, it was thought that a kidney stone is just a simple crystal that gets bigger over time," said a Dr.

"What we're seeing here is that it's dynamic. The stone is growing and dissolving. It's very rich with many components. It's very much alive," the Dr. added.

For the study, the team used a novel technology -- Airyscan super-resolution microscopy -- that allowed them to view the samples at 140-nanometer resolution --spectacularly clear, colourful images of the interior growth history of the kidney stones.

They found that kidney stones are built up in alternating thin layers of organic matter and crystals, interrupted in places with jutting interior crystals.

In the earliest stages of kidney stone development, crystals of a hydrated form of calcium oxalate adhere to one another, forming a big, irregular clump. Layers of organic matter and crystals build up on top of this inner core, creating an outer shell. The stones continue to dissolve and grow. 

But many of the layers were disrupted, revealing that part of the stones - usually the interior dihydrate crystals - had dissolved. New crystals of a dehydrated form of calcium oxalate had begun to grow again within those voids.

Researchers and doctors who study and treat kidney disease will now need to rethink their basic assumptions, the study noted.

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