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Related Experiment Videos

Synthesis and function of hepatic very-low-density lipoprotein.

G F Gibbons1, D Wiggins, A-M Brown

  • 1Oxford Centre for Diabetes, Endocrinology and Metabolism, University of Oxford, Churchill Hospital, Oxford OX3 7LJ, UK. geoff.gibbons@mrl.ox.ac.uk

Biochemical Society Transactions
|January 30, 2004
PubMed
Summary

The liver mobilizes stored fat (triacylglycerol) through lipolysis and re-esterification for very-low-density lipoprotein (VLDL) assembly. This process protects tissues from excess free fatty acids.

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Area of Science:

  • Hepatocyte lipid metabolism
  • Lipoprotein assembly
  • Endocrinology

Background:

  • Triacylglycerol (TAG) stored in hepatocytes is a major source for very-low-density lipoprotein (VLDL) assembly.
  • Lipolysis and re-esterification of cytosolic TAG are key steps in VLDL production.
  • Hepatic lipid metabolism plays a crucial role in systemic energy homeostasis and protection against lipotoxicity.

Purpose of the Study:

  • To elucidate the mechanisms of triacylglycerol mobilization and incorporation into VLDL.
  • To identify the lipases and regulatory factors involved in hepatic TAG metabolism for VLDL secretion.
  • To understand the role of hepatic TAG storage and release in protecting tissues from lipotoxicity.

Main Methods:

  • Investigated lipolysis of cytosolic TAG pools using specific lipases (arylacetamide deacetylase, triacylglycerol hydrolase).

Related Experiment Videos

  • Examined the re-esterification of lipolytic products and their incorporation into VLDL precursors.
  • Studied the influence of insulin and microsomal triacylglycerol transfer protein (MTP) on TAG cycling.
  • Analyzed the role of phospholipase D activation by ADP-ribosylation factor-1 (ARF-1) in VLDL TAG assembly.

    • Main Results:

    • Hepatocyte VLDL assembly primarily uses TAG mobilized by lipolysis and re-esterification.
    • Arylacetamide deacetylase and/or triacylglycerol hydrolase are involved in TAG mobilization.
    • Insulin stimulates, while MTP inhibits, the return of re-esterified TAG to the cytosolic pool.
    • Phospholipids, via ARF-1-mediated phospholipase D activation, also contribute to VLDL TAG.

    Conclusions:

    • Hepatic TAG mobilization and secretion as VLDL are critical for managing plasma free fatty acids.
    • The liver's capacity to store and release TAG serves as a protective mechanism against lipotoxicity.
    • Understanding these pathways provides insights into metabolic disorders and VLDL-related cardiovascular risks.