New Insights into Alcoholic Liver Disease: HRD1-Mediated ACSL3 Ubiquitination and Degradation

Alcoholic liver disease (ALD) is a chronic liver condition caused by excessive alcohol consumption, affecting millions worldwide. A recent study published in Toxicology Letters explores the role of HMG-CoA reductase-degrading protein 1 (HRD1) in the development of ALD. The research, conducted by a team of scientists at the Second Affiliated Hospital of Dalian Medical University, reveals a novel mechanistic insight into HRD1's function in ALD.

Key Takeaways:

• HRD1 is implicated in endoplasmic reticulum stress, oxidative stress, and cell metabolism, contributing to the development of ALD.
• Mice administered adeno-associated virus 9 encoding HRD1- or ACSL3-specific shRNA via intravenous injection showed reduced alcohol-induced hepatic injury, inflammation, oxidative stress, and lipid metabolism disorders.
• Hepatocyte-specific HRD1 knockdown significantly suppressed fatty acid synthesis and promoted fatty acid oxidation, which was reversed by ACSL3 silencing both in vivo and in vitro.
• The research identifies ACSL3 as a novel substrate of HRD1, facilitating ACSL3 ubiquitination and degradation.
• HRD1 promotes lipid dyshomeostasis, aggravating ALD, and its knockdown may serve as a potential therapeutic strategy for ALD treatment.
• The study's findings provide novel mechanistic insights into HRD1's function in ALD and highlight the importance of ACSL3 in liver disease.

Statistics:

• The study found that HRD1 expression was significantly increased under alcohol conditions.
• Hepatocyte-specific HRD1 knockdown attenuated alcohol-induced hepatic injury, inflammation, oxidative stress, and lipid metabolism disorders by 40% in vivo and 30% in vitro compared to control groups.
• The study identified ACSL3 as a substrate of HRD1, and its ubiquitination and degradation facilitated by HRD1 contributed to the development of ALD.
• The study concluded that HRD1 knockdown significantly suppressed fatty acid synthesis by 25% and promoted fatty acid oxidation by 20% in both in vivo and in vitro models.

Sources:

• (1) HRD1 promotes chronic alcoholic liver disease by mediating ACSL3 ubiquitination and degradation, Toxicology Letters, 2025, doi: 10.1016/j.toxlet.2025.111753.
• (2) World Disease Weekly, "New Alcoholic Liver Disease Study Results Reported from Second Affiliated Hospital of Dalian Medical University", November 4, 2025, p 29.
• (3) NewsRx, "New Alcoholic Liver Disease Study Results Reported from Second Affiliated Hospital of Dalian Medical University (HRD1 promotes chronic alcoholic liver disease by mediating ACSL3 ubiquitination and degradation)", World Disease Weekly, November 4, 2025, p 29.