LC-MS/MS Quantification of Endocannabinoids in Tissues

Area of Science:

• Biochemistry
• Analytical Chemistry
• Neuroscience

Background:

• Endocannabinoids (ECBs) are endogenous lipid mediators crucial for physiological functions like energy balance, immunity, and neural development.
• Accurate quantification of ECBs is essential for understanding their roles and how biological processes modulate them.

Purpose of the Study:

• To present a method for simultaneous quantification of 14 ECBs and related molecules.
• To enable accurate measurement across diverse tissues, including brain, liver, muscle, and adipose tissue.
• To establish a method with a dynamic range suitable for varying endogenous concentrations of these lipids.

Main Methods:

• Simultaneous quantification using liquid chromatography-tandem mass spectrometry (LC-MS/MS).
• Analysis performed on brain, liver, muscle, white adipose tissue, and brown adipose tissue.
• Method optimized with three distinct dynamic ranges to accommodate varying analyte concentrations.

Main Results:

• Successfully quantified 14 ECBs and related molecules across multiple tissue types.
• Established specific concentration ranges: 0.5-5000 ng/mL, 0.05-500 ng/mL, and 0.0005-0.5 ng/mL.
• Demonstrated the method's capability to cover a wide spectrum of endogenous lipid concentrations.

Conclusions:

• The developed LC-MS/MS method provides a robust tool for simultaneous ECBs quantification.
• This method facilitates comprehensive analysis of ECBs in various tissues.
• Accurate ECBs measurement supports further research into their physiological and pathological roles.