New Insights on Alcohol-Related Liver Disease

Long-term heavy drinking can cause serious liver damage, but recent research is shedding light on why the liver sometimes fails to heal, even after alcohol consumption stops. Researchers from the University of Illinois Urbana-Champaign, Duke University, and the Chan Zuckerberg Biohub Chicago have uncovered important information regarding alcohol-related liver disease (ARLD), which could pave the way for new treatments beyond the need for liver transplants.

Alcohol Puts Liver Cells in “Limbo”

The liver has a remarkable ability to regenerate. When part of it is injured or removed, healthy liver cells reproduce to replenish tissue. This regenerative capability is why liver transplants can be successful—unlike other organs, such as the heart, which don’t recover as effectively. However, years of heavy drinking can significantly diminish this regenerative power. Those with alcohol-related hepatitis or advanced cirrhosis may deal with scarring and liver failure. Unfortunately, quitting alcohol doesn’t always reverse the damage.

When researchers compared healthy livers to those harmed by alcohol, they discovered that liver cells attempt to switch to repair mode but often get stuck in a kind of halfway functioning state. They don’t mature fully, nor do they transform into the “stem-like” cells needed to regenerate tissue. It’s almost like being caught halfway up a ladder, unable to move either up or down. This situation puts additional strain on the remaining healthy cells, inhibiting the liver’s repair mechanisms.

RNA Splicing Issues

Every cell uses RNA to provide instructions for protein production. However, in damaged livers, RNA splicing—the process that edits these instructions—doesn’t function properly. Imagine trying to edit a film but mixing up all the scenes. The outcome? Proteins end up in the wrong locations, causing liver repair to effectively stall. The study identified a protein known as ESRP2, which is crucial for RNA splicing, as absent in damaged liver cells. Without ESRP2, the liver’s “repair instructions” are disrupted, halting regeneration altogether. Mice lacking ESRP2 showed similar liver damage to that seen in humans suffering from alcohol-related liver disease.

Inflammation Worsens the Situation

Alcohol-damaged livers often suffer from inflammation. The influx of immune and supportive cells releases chemicals that further suppress ESRP2, intensifying the problem. In laboratory experiments, blocking one of these inflammatory pathways restored ESRP2 levels and corrected RNA splicing issues, hinting at a potential treatment avenue. “We understood that the liver stops working and regenerating in patients with alcohol-related hepatitis and cirrhosis, even after they quit drinking, but we didn’t fully grasp why,” said Auinash Kalsotra, a professor at U. of I, who co-led the study.

Potential Future Implications

This new research opens up possibilities for innovative therapies for alcohol-related liver disease. Future treatments may include:

• Reducing liver inflammation
• Restoring proper RNA splicing
• Assisting the liver in healing even after extended periods of heavy drinking

For millions of Americans affected by alcoholic liver disease, these findings could lead to life-saving alternatives to liver transplants.