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Related Experiment Video

Updated: May 30, 2026

Quantification of Subcellular Glycogen Distribution in Skeletal Muscle Fibers using Transmission Electron Microscopy

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Triglyceride content in skeletal muscle: variability and the source.

¹Endocrine Research Unit, Mayo Foundation, Rochester, Minnesota 55905, USA. guo.zengkui@mayo.edu

Analytical Biochemistry

|August 25, 2001

Summary

Intramyocellular triglycerides (imcTG) are vital for muscle energy. New methods show contamination from extramyocellular triglycerides (emcTG) causes inaccurate imcTG measurements and high variability.

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Area of Science:

Muscle metabolism
Lipid biochemistry
Cellular energy sources

Background:

Intramyocellular triglycerides (imcTG) are crucial energy substrates in skeletal muscle.
The metabolism and regulation of imcTG remain poorly understood.
High variability in reported imcTG content complicates research.

Purpose of the Study:

To investigate the sources of variability in skeletal muscle imcTG measurements.
To identify and address contaminants affecting imcTG quantification.
To establish a reliable method for measuring pure imcTG content.

Main Methods:

Analysis of muscle specimens for lipid content.
Comparison of standard lipid extraction procedures with microdissection techniques.
Quantification of intramyocellular triglycerides (imcTG) and extramyocellular triglycerides (emcTG).

Main Results:

Standard methods for muscle specimen processing are inadequate for removing extramyocellular triglyceride (emcTG) contaminants.
emcTG contamination leads to significant overestimation of imcTG content.
This contamination is the primary driver of high variability in imcTG measurements.
Meticulous microdissection is essential for obtaining pure muscle fibers and accurate imcTG quantification.

Conclusions:

Extramyocellular triglyceride (emcTG) contamination is a major confounding factor in skeletal muscle intramyocellular triglyceride (imcTG) research.
Accurate measurement of imcTG requires rigorous removal of emcTG contaminants.
Microdissection techniques offer a reliable approach to obtaining pure muscle fibers for precise imcTG analysis.