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AGK regulates the progression to NASH by affecting mitochondria complex I function.

Nan Ding1, Kang Wang2, Haojie Jiang1

  • 1Department of Biochemistry and Molecular Cell Biology, Shanghai Key Laboratory for Tumor Microenvironment and Inflammation, Shanghai Jiao Tong University School of Medicine, Shanghai, China.

Theranostics
|May 13, 2022
PubMed
Summary
This summary is machine-generated.

Acylglycerol kinase (AGK) deficiency impairs mitochondrial function, worsening non-alcoholic steatohepatitis (NASH) in mice. AGK interacts with mitochondrial complex I, maintaining liver health independently of its kinase activity.

Keywords:
NDUFS2fatty acid metabolismmitochondrial ROSmitochondrial respiratory chain

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Area of Science:

  • Hepatology
  • Mitochondrial Biology
  • Molecular Medicine

Background:

  • Impaired mitochondrial function is a key factor in non-alcoholic steatohepatitis (NASH).
  • Acylglycerol kinase (AGK), a TIM22 complex subunit, is linked to Sengers syndrome but its role in NASH is unknown.

Purpose of the Study:

  • To investigate the role and molecular mechanisms of Acylglycerol kinase (AGK) in the pathogenesis of non-alcoholic steatohepatitis (NASH).

Main Methods:

  • Utilized hepatic-specific AGK-deficient and AGK G126E mutant mice fed choline-deficient/high-fat or methionine-choline-deficient diets.
  • Assessed liver damage, lipid accumulation, mitochondrial function, and molecular interactions related to AGK.

Main Results:

  • AGK levels were reduced in human NASH livers; AGK deficiency caused severe liver damage and lipid accumulation in mice.
  • AGK deficiency, not AGK G126E mutation, exacerbated NASH symptoms, linked to hepatic mitochondrial dysfunction.
  • AGK interacts with mitochondrial respiratory chain complex I subunits (NDUFS2, NDUFA10), regulating fatty acid metabolism and complex I function.

Conclusions:

  • AGK plays a critical role in maintaining hepatic mitochondrial integrity and preventing NASH.
  • AGK interacts with mitochondrial respiratory chain complex I through a kinase-independent pathway.
  • AGK deficiency contributes to NASH pathogenesis via mitochondrial dysfunction.