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Long-chain fatty acids decrease lipoprotein lipase activity of cultured rat adipocyte precursors

J L Kirkland1, C H Hollenberg, S Kindler

  • 1Institute of Medical Science, University of Toronto, Ontario, Canada.

Metabolism: Clinical and Experimental
|February 1, 1994
PubMed
Summary
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Fatty acids, like oleic acid, reduce lipoprotein lipase (LPL) activity in rat fat cells by decreasing LPL mRNA levels. This effect is specific and depends on fatty acid structure, with activity returning after oleic acid removal.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Metabolism

Background:

  • Lipoprotein lipase (LPL) is crucial for triglyceride metabolism.
  • Adipocyte precursors are key cells in fat tissue development and function.

Purpose of the Study:

  • To investigate the impact of fatty acids on rat adipocyte precursor LPL activity.
  • To determine the molecular mechanisms underlying fatty acid-induced changes in LPL activity.

Main Methods:

  • Culturing rat adipocyte precursors (perirenal and epididymal).
  • Treating cells with varying concentrations and types of fatty acids (e.g., oleic acid).
  • Measuring intracellular and heparin-releasable LPL activity, protein synthesis ([3H]-leucine incorporation), and LPL/G3PD mRNA levels.

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Main Results:

  • Oleic acid significantly reduced LPL activity in a dose- and time-dependent manner.
  • The reduction in LPL activity was linked to decreased LPL mRNA levels, not protein synthesis.
  • Fatty acid structure (carboxyl group, acyl chain length) influenced the extent of LPL activity decrease.

Conclusions:

  • Fatty acids specifically decrease LPL activity in adipocyte precursors.
  • This decrease is mediated, at least partly, by reduced LPL mRNA levels.
  • LPL activity recovers after cessation of fatty acid exposure.