Cited by 23Autophagy in Disease and TherapyMedicinal plant effects and applicationsLiver Disease Diagnosis and Treatment

Dihydromyricetin attenuates palmitic acid-induced oxidative stress by promoting autophagy via SIRT3-ATG4B signaling in hepatocytes

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Huang, Li, Zeng, Xianglong, Li, Bo, Wang, Cong, Zhou, Min, Lang, Hedong, Yi, Long, Mi, Mantian·2021·Nutrition & Metabolism

Abstract

Background: Oxidative stress in hepatocytes was important pathogenesis of nonalcoholic steatohepatitis (NASH). Autophagy was a cellular process that can remove damaged organelles under oxidative stress, and thus presented a potential therapeutic target against NASH. This work aimed to investigate whether autophagy was participated in the protective effects of dihydromyricetin (DHM) on palmitic acid (PA)-induced oxidative stress in hepatocytes and the underlying mechanism. Methods: HepG2 and HHL-5 cell lines were pretreated with DHM (20 μM) for 2 h, followed by PA (0.2 mM) treatment for 16 h. The oxidative stress was assessed by the quantification of intracellular reactive oxygen species (ROS), mitochondrial ROS (mtROS), mitochondrial membrane potential (MMP) and mitochondrial ultrastructural analyses. The protein expressions of SIRT3, LC3I/II, P62 and ATG4B, as well as the acetylation of AGT4B were determined by western blotting using HepG2 and HepG2/ATG4B± cells with heterozygous knockout of ATG4B. Results: Exposure to PA resulted in increased intracellular ROS and mtROS, decreased MMP and aggravated mitochondrial injury in HepG2 cells, which were notably attenuated by DHM treatment. DHM-induced inhibition of oxidative stress was associated with the induction of autophagy, characterized by upregulated ATG4B and LC3 II as well as downregulated P62 levels. Furthermore, the inhibitory effects of DHM on PA-induced autophagy arrest and oxidative stress were eliminated when pretreated with a SIRT3 inhibitor 3-TYP or conducted in HepG2/ATG4B± cells, suggesting that SIRT3 and ATG4B were involved in DHM-induced benefits. Moreover, DHM treatment increased the protein expression of SIRT3 and SIRT3-dependent deacetylation of ATG4B in HepG2 cells. Conclusion: Our results demonstrated that DHM attenuated PA-induced oxidative stress in hepatocytes through induction of autophagy, which was mediated through the increased expression of SIRT3 and SIRT3-mediated ATG4B deacetylation following DHM treatment.

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  • ROS accumulation triggers damaging cascades: a decrease in mitochondrial membrane potential, activation of caspases 3/7, apoptosis, and ER stress and inflammation via NF-κB.

    “ROS accumulation triggers damaging cascades: a decrease in mitochondrial membrane potential, activation of caspases 3/7, apoptosis, and ER stress and inflammation via NF-κB [90,152,153,154,155].”

    From The HepG2 Cell Line as a Model for Studying Metabolic Dysfunction-Associated Steatotic Liver Disease (2026) · cites this paper as [152]

    The Introduction (page not provided) links increased ROS and oxidative stress with reduced mitochondrial membrane potential, hepatic inflammation, and hepatocyte death. It does not identify caspase-3/7 activation, apoptosis, or NF-κB as steps in that cascade. It describes ER stress as a contributor to palmitic-acid-induced oxidative stress, rather than a consequence of ROS accumulation. (LLM, conf=0.84)

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Authors
Huang, L., Zeng, X., Li, B., Wang, C., Zhou, M., Lang, H., Yi, L., & Mi, M.
Affiliations
  • Army Medical University (CN)
  • Chinese People's Liberation Army (CN)
Corresponding author
  • Yi, Long
  • Mi, Mantian
Venue
Nutrition & Metabolism
Published
2021-09-09
Volume
18
Issue
1
Pages
83-83
ISSN
1743-7075 (ISSN-L)
OpenAlex
W3157872931
Cited by
23
References
51
Citations by year
2026: 2 · 2025: 5 · 2024: 4 · 2023: 5 · 2022: 7
FWCI
2.88
Type
journal article
Language
en
Open access
Locations
  • Nutrition & Metabolism (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
National Natural Science Foundation of China (81903317)
Topics
  • Health Sciences › Medicine › Epidemiology › Autophagy in Disease and Therapy
  • Health Sciences › Medicine › Complementary and alternative medicine › Medicinal plant effects and applications
  • Health Sciences › Medicine › Epidemiology › Liver Disease Diagnosis and Treatment
Keywords
dihydromyricetin, palmitic acid, oxidative stress, autophagy, SIRT3, ATG4B, hepatocytes, nonalcoholic steatohepatitis, mitochondrial dysfunction, reactive oxygen species, LC3, p62, mitochondrial membrane potential

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