Liver Cells Stuck in RNA Splicing Trap After Alcohol Damage — SkimNews
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- University of Illinois Urbana-Champaign researchers, collaborating with Duke and the Chan Zuckerberg Biohub Chicago, found that alcohol-related liver disease traps damaged liver cells in a "quasi-progenitor" state — neither functional adult cells nor regenerative progenitor cells — so they cannot complete repair even after drinking stops.
- The regenerative failure stems from widespread RNA missplicing across thousands of genes, disrupting both protein function and the cellular localization signals that direct proteins to where they need to work inside the cell.
- A protein called ESRP2 emerged as a key driver: levels of this RNA-splicing regulator were deficient in diseased livers, and mice engineered to lack ESRP2 developed liver injury and failed regeneration patterns resembling advanced alcohol-related hepatitis in humans.
- The team traced ESRP2 suppression back to inflammation: immune and support cells recruited to alcohol-damaged tissue release inflammatory factors that suppress ESRP2 production and activity.
- In lab cultures, blocking the receptor for one inflammation-promoting factor restored ESRP2 levels and normalized RNA splicing, suggesting the inflammatory pathway could be a future treatment target.
- Published in Nature Communications, the study also points to abnormally spliced RNA molecules as potential diagnostic markers for alcohol-associated liver disease, currently a leading cause of roughly 3 million deaths per year worldwide.
- Co-leader Auinash Kalsotra of U. of I. said the findings could become "a launching pad for future clinical studies" to curb inflammation or correct splicing defects and restore damaged livers without transplantation.
Why it matters: Alcohol-associated liver disease causes roughly 3 million deaths per year, and the only existing treatment at the liver-failure stage is transplantation. By pinpointing inflammation-driven RNA missplicing — and specifically the loss of ESRP2 — as the mechanism trapping liver cells in a non-functional middle state, the study gives researchers concrete molecular targets for both earlier diagnostics and therapies that could restore regeneration, potentially reducing reliance on transplants.
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