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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Nutraceuticals

Background:

  • Royal jelly (RJ) is known to reduce serum lipids, but the underlying mechanisms are unclear.
  • Angiopoietin-like protein 8 (ANGPTL8) is a key regulator of lipid metabolism.
  • Specific fatty acids in RJ may influence lipid-lowering effects.

Purpose of the Study:

  • To investigate the effect of RJ fatty acids on ANGPTL8 expression in liver cells.
  • To elucidate the molecular mechanism by which sebacic acid (SA) affects ANGPTL8.

Main Methods:

  • Human hepatoma HepG2 cells were treated with RJ fatty acids, including SA.
  • Reporter assays were used to assess ANGPTL8 promoter activity.
  • Hepatocyte nuclear factor-4α (HNF4α) binding and protein levels were analyzed.
  • Small interfering RNA (siRNA) was used to knock down HNF4α.

Main Results:

  • Sebacic acid significantly reduced ANGPTL8 expression and promoter activity.
  • SA decreased HNF4α protein levels and its binding to the ANGPTL8 promoter.
  • HNF4α knockdown led to suppressed ANGPTL8 mRNA expression.

Conclusions:

  • Sebacic acid downregulates ANGPTL8 expression in liver cells.
  • This downregulation is mediated by a reduction in HNF4α protein levels and activity.
  • SA's effect on ANGPTL8 offers a potential mechanism for RJ's lipid-lowering benefits.