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ORIGINAL ARTICLE
Curcumin Prevents Free Fatty Acid-Induced Lipid Accumulation via Targeting the miR-22-3p/CRLS1 Pathway in HepG2 Cells
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Xiaoting Sun 1,2,3
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Xiaowen Wu 1,2,3
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Jian Li 1,2
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1
College of Ocean Food and Biological Engineering, Jimei University, Xiamen, Fujian 361021, P. R. China
 
2
Fujian Marine Functional Food Engineering Technology Research Center, Xiamen, Fujian 361021, P. R. China
 
3
HI. Q Biomedical Laboratory, Taiwan Investment Zone, Quanzhou, Fujian, 362123, P. R. China
 
4
Center for Precision Medicine, Yi He Hospital, Taiwan Investment Zone, Quanzhou, Fujian, 362123, P. R. China
 
5
Shanghai Institute of Immunology, Shanghai Jiaotong University School of Medicine, Shanghai, 200025, P. R. China
 
These authors had equal contribution to this work
 
 
Submission date: 2023-11-08
 
 
Acceptance date: 2024-01-22
 
 
Online publication date: 2024-02-13
 
 
Publication date: 2024-02-13
 
 
Corresponding author
Guiling Li   

College of Ocean Food and Biological Engineering, Jimei University, China
 
 
 
KEYWORDS
TOPICS
ABSTRACT
Dysregulated lipid metabolism in liver is an important hallmark of non-alcoholic fatty liver disease (NAFLD), which may be modulated by dietary polyphenols or microRNAs (miRNAs). However, the underlying epigenetic regulatory mechanism of polyphenols remain unclear. The current study aimed to address how miRNA mediates hepatic lipid metabolic control of curcumin, a polyphenolic food supplement. The results showed that 24 h treatment with 5 - 20 μM curcumin prevented free fatty acid-induced lipid accumulation by around 10 ~ 50% in HepG2 cells, which was attenuated by pre-transfection with 40 nM miR-22-3p mimic for 48 h. In consequence, transfection with 40 nM miR-22-3p inhibitor for 48 h significantly reduced lipid accumulation by around 10%. And 48 h overexpression of miR-22-3p targeting cardiolipin synthase 1 (CRLS1) gene, which encodes a mitochondrial phospholipid synthase, showed a similar regulatory effect. Thus, miR-22-3p and CRLS1 showed opposite effects in modulating lipid metabolism, which probably involved mitochondrial control. In summary, this study demonstrated that curcumin improved hepatic lipid metabolism via targeting the miR-22-3p/CRLS1 pathway. Identification of the epigenetic regulatory mechanism underlying lipid metabolism may thereby facilitate alleviation of metabolic disorders by natural polyphenols.
FUNDING
This work was supported by the National Natural Science Foundation of China (31771972), the Natural Science Foundation of Fujian Province (2017J01447), Fujian Province Young and Middle-aged Teachers Education Research Project (JAT200247), the opening project of National & Local Joint Engineering Research Center of Deep Processing Technology for Aquatic Products (Z823288), the Science and Technology Project of Quanzhou (2017Z003) and the High-level Talent Innovation Project of Quanzhou (2019CT007).
CONFLICT OF INTEREST
The authors declare that they have no conflicts of interest.
 
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