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Rat liver nuclear lipids. Composition and biosynthesis.

M Song1, G Rebel

  • 1Centre de Neurochimie du CNRS, Université Louis Pasteur, Strasbourg, France.

Basic and Applied Histochemistry
|January 1, 1987
PubMed
Summary
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Rat liver nuclei contain significant neutral lipids, including triglycerides and free fatty acids, which are not formed during isolation. Nuclei can incorporate phosphate into lipids but cannot synthesize new phospholipids.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Lipid Metabolism

Background:

  • Rat liver nuclei possess a unique lipid composition.
  • Neutral lipids are abundant and distinct from phospholipids.
  • Previous studies have not fully elucidated nuclear lipid synthesis and metabolism.

Purpose of the Study:

  • To characterize the neutral lipid and phospholipid content of rat liver nuclei.
  • To investigate the origin of neutral lipids within the nucleus.
  • To determine the capacity of nuclei for phospholipid synthesis and phosphate incorporation.

Main Methods:

  • Isolation of rat liver nuclei.
  • Lipid extraction and analysis (e.g., gas chromatography).
  • Assessment of phospholipid synthesis and inorganic phosphate incorporation.

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Main Results:

  • Rat liver nuclei exhibit high levels of neutral lipids, primarily triglycerides and free fatty acids.
  • These neutral lipids are intrinsic and not artifacts of nuclear isolation.
  • The fatty acid profile of neutral lipids is more saturated compared to phospholipids.
  • Phosphatidylinositol phosphates are present in nuclei.
  • Nuclei lack de novo phospholipid synthesis capabilities but can incorporate inorganic phosphate via kinase pathways.

Conclusions:

  • Rat liver nuclei contain a distinct and substantial neutral lipid fraction.
  • Nuclear lipid metabolism involves phosphate incorporation but not de novo synthesis of phospholipids.