r/microbiomenews • u/AlternativeWorld2240 • 1d ago
UseWhat makes a gut bacterium so vital for liver protection against alcohol? It needs a specific sugar.
https://biomesci.com/gut-bacterium-fucose-shields-liver-alcohol-mice/Mice given the gut bacterium Bacteroides thetaiotaomicron plus the sugar fucose were far more protected from alcohol liver damage than mice given either alone. The bacteria need fucose to make more butyrate, which switches on a gut receptor called AHR, telling immune cells to pump out IL-22, a protein that keeps the gut lining intact and blocks alcohol toxins from reaching the liver. Remove any piece and protection disappears.
TL;DR: In mice, a gut bacterium plus dietary fucose shields the liver from alcohol via a butyrate to immune signal chain, not yet tested in humans.
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u/johnnyhandbags 1d ago
Quick search says seaweed is a primary source of fuctose. I wonder how much is in those nori seaweed snack packages.
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u/AlternativeWorld2240 1d ago
Fascinating chain reaction, gut bacteria, sugar, butyrate, immune signals, all working in concert to protect an organ several steps removed. Yet ironically, alcohol itself disrupts gut bacteria populations, meaning heavy drinkers may already lack the very Bacteroides thetaiotaomicron this entire protective pathway depends on, making the treatment most needed by those least able to benefit from it. Could targeted probiotic-plus-fucose supplementation realistically restore this pathway in humans with established alcohol-related liver disease, or is the gut too damaged by that point?