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Omega-3 fatty acids improve lipid metabolism by regulating miR-34a
Luxuan Li1,2,3, Yale Tang1,2, Xiaoyu Wang1,2
1Department of Internal Medicine, Hebei Medical University, Shijiazhuang, 050017, Hebei, People's Republic of China.
Scientific Reports
|March 6, 2026
Summary
Omega-3 fatty acids improve lipid metabolism and reduce liver fat buildup by decreasing miR-34a. This finding offers new insights into managing metabolic diseases like non-alcoholic fatty liver disease.
Area of Science:
- Biochemistry
- Molecular Biology
- Hepatology
Background:
- Lipid metabolism disorders and hepatic lipid deposition are key factors in metabolic diseases, including non-alcoholic fatty liver disease (NAFLD).
- Omega-3 fatty acids show promise in improving lipid homeostasis and liver function, but their precise molecular mechanisms require further elucidation.
- MicroRNA-34a (miR-34a) has emerged as a potential regulator in metabolic processes.
Purpose of the Study:
- To investigate the effects of omega-3 fatty acids on lipid metabolism and hepatic lipid deposition.
- To explore the modulatory role of miR-34a in these processes.
- To elucidate the molecular mechanisms underlying omega-3 fatty acid action in a high-fat diet (HFD) and palmitic acid (PA)-induced cellular model.
Main Methods:
- Utilized an in vivo HFD mouse model and an in vitro PA-induced HepG2 cell model.
- Assessed serum lipid profiles (triglyceride [TG], total cholesterol [TC], low-density lipoprotein cholesterol [LDL-C]) and hepatic lipid levels.
- Quantified mRNA and protein expression of miR-34a, SIRT1, sterol regulatory element-binding protein-1c (SREBP-1c), carnitine palmitoyltransferase 1A (CPT-1A), and peroxisome proliferator-activated receptor gamma coactivator 1-alpha (PGC-1α).
Main Results:
- HFD and PA treatments upregulated miR-34a expression.
- Omega-3 fatty acid intervention significantly reduced serum and hepatic TG and TC levels, alleviating hepatocyte steatosis.
- Omega-3 fatty acids decreased miR-34a and SREBP-1c expression while increasing SIRT1, PGC-1α, and CPT-1A expression.
- miR-34a overexpression counteracted the beneficial effects of omega-3 fatty acids on key metabolic regulators.
Conclusions:
- Omega-3 fatty acids promote lipid metabolism and reduce hepatic lipid deposition.
- The mechanism involves the down-regulation of miR-34a expression.
- These findings highlight miR-34a as a critical mediator in the protective effects of omega-3 fatty acids against hepatic steatosis.
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