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Myristic acid utilization and processing in BC3H1 muscle cells.

L X Wang1, T L Kaduce, A A Spector

  • 1Department of Biochemistry, University of Iowa, Iowa City 52242.

The Journal of Biological Chemistry
|July 25, 1991
PubMed
Summary

Myristic acid (14:0) metabolism in muscle cells shows rapid elongation and desaturation. Differentiated myocytes exhibit increased oxidation of myristic acid into novel metabolites.

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Area of Science:

  • Cellular lipid metabolism
  • Muscle cell differentiation
  • Fatty acid biochemistry

Background:

  • Myristic acid (14:0) plays a crucial role in regulating cellular functions.
  • Understanding fatty acid utilization is key to comprehending muscle cell physiology.

Purpose of the Study:

  • To investigate the utilization and metabolic fate of myristic acid (14:0) in BC3H1 muscle cells.
  • To explore the impact of differentiation on myristic acid metabolism.

Main Methods:

  • Labeling BC3H1 myoblasts and myocytes with radioactive myristic acid ([9,10-3H]14:0 and [1-14C]14:0).
  • Analysis of lipid incorporation into phospholipids and neutral lipids (triacylglycerol).
  • Assessment of fatty acid elongation, desaturation, and protein labeling.
  • Identification of radioactive metabolites released into the medium using chemical analysis.

Main Results:

  • Myristic acid was primarily incorporated into phosphatidylcholine, with significant accumulation in triacylglycerol.
  • Rapid elongation and desaturation of myristic acid were observed in both cell types.
  • Novel, lipid-soluble metabolites, identified as hydroxylated fatty acids, were produced from myristic acid.
  • Differentiated myocytes produced higher amounts of these oxidative metabolites compared to myoblasts.

Conclusions:

  • BC3H1 cells metabolize myristic acid through elongation, desaturation, and oxidation pathways.
  • Differentiation into myocytes enhances the oxidative metabolism of myristic acid.
  • The study reveals the complex fate of myristic acid beyond phosphatidylcholine incorporation.

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