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Related Concept Videos

Cell Specific Gene Expression01:58

Cell Specific Gene Expression

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Multicellular organisms contain a variety of structurally and functionally distinct cell types, but the DNA in all the cells originated from the same parent cells. The differences in the cells can be attributed to the differential gene expression. Liver cells, whose functions include detoxification of blood, production of bile to metabolize fats, and synthesis of proteins essential for metabolism, must express a specific set of genes to perform their functions. Gene expression also varies with...
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The SIRT6 Activator MDL-800 Inhibits PPARα and Fatty acid Oxidation-Related Gene Expression in Hepatocytes.

Yeonsoo Kim1, Hyeokjin Lim1, Ye Eun Cho1

  • 1College of Pharmacy and Research Institute for Drug Development, Pusan National University, Busan 46241, Republic of Korea.

Biomolecules & Therapeutics
|April 8, 2025
PubMed
Summary
This summary is machine-generated.

A SIRT6 activator, MDL-800, unexpectedly reduced fatty acid oxidation genes in liver cells. This effect was due to oxidative stress, not SIRT6 activation, highlighting a new therapeutic target for liver disease.

Keywords:
Fatty acid oxidationMDL-800PPARαReactive oxygen speciesSIRT6

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Hepatology

Background:

  • SIRT6 is a histone deacetylase regulating lipid metabolism and fatty acid oxidation.
  • Dysregulated fatty acid oxidation contributes to liver steatosis, lipotoxicity, and inflammation.
  • SIRT6 activates peroxisome proliferator-activated receptor-alpha (PPARα), a key regulator of fatty acid oxidation.

Purpose of the Study:

  • To evaluate the effect of the SIRT6 activator MDL-800 on PPARα and fatty acid oxidation genes.
  • To elucidate the mechanism by which MDL-800 affects these pathways.

Main Methods:

  • Treatment of AML12 mouse hepatocytes with MDL-800 (SIRT6 activator) and OSS128167 (SIRT6 inhibitor).
  • Analysis of PPARα and fatty acid oxidation gene expression.
  • Investigation of reactive oxygen species (ROS) production and stress kinase activation.
  • Co-treatment experiments with antioxidants and JNK inhibitors.

Main Results:

  • MDL-800 activated SIRT6 but decreased PPARα and its target gene expression.
  • A SIRT6 inhibitor did not reverse MDL-800's suppressive effects, indicating a SIRT6-independent mechanism.
  • MDL-800 increased ROS production and activated stress kinases (e.g., JNK).
  • The suppression of PPARα by MDL-800 was reversed by N-acetylcysteine (antioxidant) and SP600125 (JNK inhibitor).

Conclusions:

  • MDL-800 suppresses PPARα and fatty acid oxidation genes in hepatocytes primarily via induced oxidative stress.
  • The observed effects of MDL-800 are independent of its SIRT6-activating function.
  • MDL-800's mechanism suggests potential for targeting oxidative stress pathways in steatotic liver disease, separate from direct SIRT6 activation.