Elevated Fructose and Uric Acid Through Aldose Reductase Contribute to Experimental and Human Alcoholic Liver Disease.
Level 5 - mechanism / opinion, no new human data
Preclinical animal and in vitro mechanistic study with correlational human tissue samples
PubMed 32086945 · doi:10.1002/hep.31197
What was done
The authors investigated the role of aldose reductase (AR)—the primary endogenous enzyme producing fructose—and its metabolites (sorbitol, fructose, uric acid) in alcohol-associated liver disease (ALD). They evaluated liver specimens from patients with alcoholic hepatitis, cell culture systems, and mouse models, including AR knockout mice and mice receiving pharmacological AR inhibitors.
What was found
In human alcoholic hepatitis specimens, AR upregulation and elevated sorbitol, fructose, and uric acid correlated with increased lipid peroxidation byproducts, endoplasmic reticulum (ER) stress, decreased protective ER chaperones, and greater liver injury and cell death; no numerical values or effect sizes were reported in the abstract. In mice, AR genetic deletion prevented alcohol-induced increases in AR metabolites, toxic aldehydes, steatosis, ER stress, apoptosis, and liver injury. Pharmacological AR inhibition likewise ameliorated alcohol-induced hepatic injury in mice.
Why it matters
This work identifies the polyol pathway and endogenous fructose/uric acid generation as mechanistic contributors to alcohol-induced liver injury. It provides a preclinical rationale for investigating aldose reductase inhibitors as potential treatments for ALD.
Limits
The abstract provides no sample sizes, demographic details, or quantitative effect estimates for the human specimens or animal models. Results rely primarily on mouse models and correlative human tissue samples, requiring human interventional trials to confirm therapeutic relevance.
Cited by
- supports Alcohol consumption activates an enzyme that converts glucose to fructose, causing endogenous fructose synthesis in the liver.
- supports A human study showed that aldose reductase is activated and fructose is present in the liver of individuals drinking alcohol.
- supports In animal models, blocking fructose metabolism or blocking aldose reductase prevents alcohol-induced fatty liver disease.
- supports Non-alcoholic fatty liver disease and alcoholic liver disease share biochemical abnormalities including low AMP, high oxidative stress, and elevated uric acid.