Quantifying ceramide kinetics in vivo using stable isotope tracers and LC-MS/MS

Area of Science:

• Biochemistry
• Metabolic disease research
• Pharmacology

Background:

• Dyslipidemia is linked to insulin resistance, with ceramides playing a key role.
• Elevated ceramide levels correlate with impaired insulin signaling and cardiometabolic disease risk.
• Limited in vivo data exist on ceramide synthesis and turnover rates.

Purpose of the Study:

• To develop and validate a method for measuring ceramide kinetics in vivo.
• To investigate the impact of diet-induced alterations on ceramide flux.
• To assess the effects of myriocin, a ceramide synthesis inhibitor, on ceramide turnover.

Main Methods:

• Utilized deuterium-labeled water ([2H]water) administration.
• Employed liquid chromatography-tandem mass spectrometry (LC-MS/MS) for precise quantification.
• Applied this technique to study diet-induced changes and pharmacological inhibition of ceramide synthesis.

Main Results:

• Successfully demonstrated the ability to measure ceramide kinetics in vivo.
• Quantified the effects of dietary changes on ceramide flux.
• Observed the impact of myriocin on ceramide synthesis and turnover, validating the method's utility.

Conclusions:

• The developed method allows for the estimation of ceramide synthesis rates and fatty acid sourcing in vivo.
• This approach provides a valuable tool for studying ceramide metabolism in the context of metabolic health.
• Further refinement of this method is essential for robust in vivo ceramide kinetic studies.