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The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
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Hydroxytyrosol Promotes the Mitochondrial Function through Activating Mitophagy.

Yanzou Dong1, Manhan Yu1,2, Youlin Wu2

  • 1Key Laboratory for Feed Quality Testing and Safety, Fisheries College, Jimei University, Xiamen 361021, China.

Antioxidants (Basel, Switzerland)
|May 28, 2022
PubMed
Summary
This summary is machine-generated.

Hydroxytyrosol (HT) from olive oil improves liver health by reducing fat accumulation and oxidative stress in fish. It achieves this by enhancing mitochondrial function and activating mitophagy via the AMPK/PINK1 pathway.

Keywords:
fat depositionfish modelhydroxytyrosolmitochondrionnon-alcoholic fatty liver disease

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Animal Science

Background:

  • Mitochondrial dysfunction is implicated in non-alcoholic fatty liver disease (NAFLD) pathogenesis.
  • Hydroxytyrosol (HT), found in olive oil, may offer protective effects against NAFLD by modulating mitochondrial function.
  • The precise mechanisms by which HT impacts NAFLD and mitochondria remain unclear.

Purpose of the Study:

  • To investigate the effects of hydroxytyrosol (HT) on lipid metabolism and mitochondrial function in fish.
  • To elucidate the underlying molecular mechanisms of HT's beneficial actions in a non-alcoholic fatty liver disease (NAFLD) context.

Main Methods:

  • In vivo study: Spotted seabass were fed normal-fat and high-fat diets, with and without HT supplementation.
  • In vitro study: Zebrafish liver cells (ZFL) were treated with HT, mitophagy inhibitors (cyclosporin A), and AMPK inhibitors (compound C).
  • Analyses included lipid deposition, oxidative stress markers, and transmission electron microscopy for mitochondrial morphology.

Main Results:

  • High-fat diet (HFD) induced liver fat accumulation and oxidative stress, which were reduced by HT.
  • HT ameliorated HFD-induced mitochondrial damage, preserving cristae and matrix integrity.
  • In vitro, HT enhanced mitochondrial function and activated PINK1-mediated mitophagy, dependent on AMPK signaling.

Conclusions:

  • Hydroxytyrosol (HT) effectively alleviates hepatic lipid accumulation, oxidative stress, and mitochondrial dysfunction in a fish model of NAFLD.
  • HT's protective effects are mediated by the activation of mitophagy through the AMPK/PINK1 signaling pathway.