An LC-MS/MS Multiplexed Method to Quantify 14 Sphingolipids in Human Cerebrospinal Fluid (CSF)

Area of Science:

• Lipidomics
• Biochemistry
• Analytical Chemistry

Background:

• Sphingolipids are bioactive lipids with diverse structures and functions.
• Some sphingolipid species are structurally similar yet functionally distinct, necessitating precise quantification.
• Accurate measurement of sphingolipids is vital for understanding their roles in health and disease, particularly neurological disorders.

Purpose of the Study:

• To develop a novel liquid chromatography-mass spectrometry (LC-MS) method for quantifying sphingolipids.
• To achieve chromatographic resolution of isomeric sphingolipid species in human cerebrospinal fluid (CSF).
• To enable accurate measurement of 14 specific sphingolipid species, including ceramides, glycosphingolipids, and sphingosines.

Main Methods:

• Development of a rapid 7-minute LC-MS method.
• Separation of sphingolipids based on hydrophobicity and quantification by mass-to-charge ratio (m/z).
• Measurement of 7 ceramides, 4 glycosphingolipids, and 3 sphingosines in human CSF samples.

Main Results:

• Successful quantification of 14 sphingolipid species in human CSF.
• Achieved chromatographic resolution of isomeric species, specifically glucosylceramide (Glc Cer) and galactosylceramide (Gal Cer).
• Demonstrated the method's utility for distinguishing between structurally similar but functionally different sphingolipids.

Conclusions:

• The developed LC-MS method provides accurate and efficient quantification of sphingolipids in human CSF.
• This method is crucial for differentiating isomeric sphingolipids with distinct biological functions.
• The findings have significant implications for research into neurological diseases such as multiple sclerosis.