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Sugar causes swelling, which leads to common kidney disease: Study

Last updated: 09/01/23
By Public TV English
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WASHINGTON: A study of the organoids present in kidneys in a novel lab setting could have implications for the treatment of polycystic kidney disease (PKD), an incurable disease that affects more than 12 million people worldwide.

One important finding from the study: sugar appears to play a role in the formation of fluid-filled cysts, which are a hallmark of PKD. In humans, these cysts grow large enough to impair kidney function and eventually cause the organs to fail, necessitating dialysis or transplantation.

The study, which was published in the journal, ‘Nature Communications’, stated, “Sugar uptake is something that kidneys do all the time”.

“We found that increasing the levels of sugar in the dish cultures caused cysts to swell. And when we employed drugs known to block sugar absorption in the kidneys, it blocked this swelling. But I think it relates less to blood sugar level and more to how kidney cells take in sugar — which in this process seemed to go rogue and give rise to cysts,” said Freedman, a co-senior author of the study.

For years Freedman has studied PKD in organoids grown from pluripotent stem cells. Organoids resemble miniature kidneys: They contain filtering cells connected to tubes and can respond to infection and therapeutics in ways that parallel the responses of kidneys in people.

Although his team can grow organoids that give rise to PKD cysts, the mechanisms of those cysts’ formation are not yet understood. In this investigation, the researchers focused on how the flow of fluid within the kidney contributes to PKD.

To do so, they invented a new tool that merged a kidney organoid with a microfluidic chip. This allowed a combination of water, sugar, amino acids, and other nutrients to flow over organoids that had been gene-edited to mimic PKD.

“We were expecting the PKD cysts in the organoids to get worse under flow because the disease is associated with the physiological flow rates that we were exploring,” Freedman explained. “The surprising part was that the process of cyst-swelling involved absorption: the intake of fluid inward through cells from outside the cyst. That’s the opposite of what is commonly thought, which is that cysts form by pushing fluid outward through cells. It’s a whole new way of thinking about cyst formation.”

In the chips, the researchers observed that the cells lining the walls of the PKD cysts faced outward as they stretched and swelled, such that the tops of the cells were on the outside of the cysts. This inverted arrangement — these cells would be facing inward in living kidneys — suggests that cysts grow by pulling in sugar-rich fluid, not by secreting the liquid.

The observation gave researchers more information about how cysts form in organoids, a finding that will have to be tested further in vivo. As well, the fact that sugar levels drive cyst development points to new potential therapeutic options.

“The results of the experiment are significant because there is a whole class of molecules that block sugar uptake in the kidneys and are attractive therapeutics for a number of conditions,” Freedman said. “They haven’t been tested yet, but we view this as a proof-of-concept that these drugs could potentially help PKD patients.” (ANI)

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TAGGED: #disease, #humans, #study, #sugar, #treatment, dialysis, fluid-filled cysts, formation, function, grow, hallmark, infection, kidneys, novel lab, organoids, PKD, polycystic kidney disease, rogue, swell, transplantation, uptake, worldwide
Public TV English January 9, 2023
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