Triglyceride content in skeletal muscle: Variability and the source

Zeng Kui Guo

Research output: Contribution to journalReview article

26 Scopus citations

Abstract

Intramyocellular triglycerides (imcTG) of skeletal muscle are an important energy source for muscle work in mammals. However, the metabolism and regulation of this small intracellular neutral lipid pool are largely unknown. This is in part due to the difficulties involved with its sampling and measurement introduced by contaminants of extramyocellular triglycerides (emcTG). The contents of imcTG reported to date for both human and rodent muscle are of unusually high variability not only across species, but also within same individuals and even same muscle groups. Recent studies suggested that the inherent muscle histologic heterogeneity does not appear to be a major source for the high variability as previously believed. Rather, the new experimental data showed that the procedures commonly used to process muscle specimens before lipid extraction appear inadequate to ensure a complete removal of emcTG contaminants. The extramyocellular lipid contaminants cause an overestimation of imcTG content and markedly increase its variability. Careful and meticulous microdissection has been found necessary in order to avoid contamination by emcTG, thereby obtaining pure muscle fibers for extraction of imcTG.

Original languageEnglish (US)
Pages (from-to)1-8
Number of pages8
JournalAnalytical Biochemistry
Volume296
Issue number1
DOIs
StatePublished - Sep 1 2001

Keywords

  • Extramyocellular
  • Human
  • Intramyocellular
  • Rat
  • Skeletal muscle
  • Triglycerides

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology

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