Seoul, South Korea – A growing body of research is illuminating the complex pathways by which metabolic dysfunction-associated steatotic liver disease (MASLD), formerly known as nonalcoholic fatty liver disease, can progress to hepatocellular carcinoma, the third leading cause of cancer-related mortality worldwide. A recent review published in Pharmacological Reviews by researchers at Hanyang University ERICA details the critical role of endoplasmic reticulum (ER) stress and the unfolded protein response (UPR) in this progression, offering potential targets for future therapeutic interventions.
Affecting nearly 30% of the global population, MASLD is increasingly replacing alcoholic liver disease as a leading cause of liver transplantation, despite a decline in cases of alcohol-related liver damage, according to reports from the Korean government. This shift underscores the growing impact of lifestyle factors on liver health and the urgent need for effective management strategies. The Hanyang University study focuses on understanding the underlying mechanisms driving this trend, with a particular emphasis on the role of ER stress.
Understanding the Role of ER Stress in Liver Disease
The endoplasmic reticulum (ER) is a vital organelle within liver cells responsible for protein folding and lipid biosynthesis. When overwhelmed – by factors like overeating, physical inactivity and alcohol consumption – the ER experiences stress, triggering the unfolded protein response (UPR). While initially a protective mechanism, prolonged ER stress and UPR activation can contribute to inflammation, liver damage, and cancer development. Researchers, led by Associate Professor Ju Youn Kim from the Major in Molecular Medicine at Hanyang University ERICA, have comprehensively investigated how these processes unfold.
“Hepatocytes—the main functional cells of the liver—are the largest cell population responsible for systemic protein distribution through ER-regulated protein synthesis,” explained Dr. Kim. “This makes the precise control of hepatic ER stress essential not only for maintaining normal hepatocyte function but as well for developing therapeutic strategies against ER stress-driven MASLD. We have systematically summarized the current knowledge in this field.”
New Insights into MASLD Progression
The review highlights newly identified molecular mechanisms underlying the progression from metabolic dysfunction-associated steatohepatitis (MASH) – the inflammatory stage of MASLD – to cirrhosis and hepatocellular carcinoma. The research team specifically focused on the role of hepatic ER stress in causing injury to hepatocytes and triggering stress responses within a liver overloaded with lipids. Their findings, initially made available online on October 14, 2025, and published in Volume 77, Issue 6 of Pharmacological Reviews on November 1, 2025, offer a holistic framework for understanding these complex interactions.
The analysis also examines the potential of existing therapeutic strategies, including recently approved GLP-1 receptor agonists, to mitigate ER stress and improve liver health. The researchers explored the connection between the brain and the liver in the progression of metabolic disease, suggesting a more integrated approach to treatment may be beneficial.
Time-Restricted Eating Shows Promise in MASLD Management
Interestingly, research from Hanyang University also suggests that dietary interventions may play a significant role in managing MASLD. A study published in June 2025 demonstrated that time-restricted eating (TRE) – limiting food intake to a specific window each day – effectively reduced hepatic steatosis (fat accumulation in the liver) in overweight or obese patients with MASLD. The benefits were comparable to those achieved through traditional calorie restriction, but TRE may be a more practical and sustainable approach, particularly for Asian populations, according to researchers.
The TRE group in the study experienced significant reductions in body weight, waist circumference, and body fat mass, without reporting any serious adverse events. This suggests that simple adjustments to eating patterns could offer a valuable tool in combating the growing epidemic of fatty liver disease.
“Our study suggests that TRE may be more practical and easier to follow, especially for Asian populations,” commented Dr. Joo Hyun Oh, a researcher involved in the TRE study.
Future Directions and Implications
The research from Hanyang University ERICA provides crucial insights into the pathogenesis of MASLD and its progression to liver cancer. By identifying key molecular mechanisms and exploring potential therapeutic strategies, these studies pave the way for the development of more effective interventions to prevent and treat this increasingly prevalent condition. Further research is needed to validate these findings in larger and more diverse populations and to explore the long-term effects of interventions targeting ER stress and dietary modifications.
This work underscores the importance of addressing lifestyle factors, such as diet and physical activity, in preventing and managing liver disease. As the demand for liver transplantation continues to rise, driven by the increasing incidence of MASLD, a proactive approach to liver health is more critical than ever.
Disclaimer: This article provides informational content and should not be considered medical advice. Please consult with a qualified healthcare professional for any health concerns or before making any decisions related to your health or treatment.
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