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Related Experiment Video

Updated: May 22, 2026

Quantitative and Qualitative Method for Sphingomyelin by LC-MS Using Two Stable Isotopically Labeled Sphingomyelin Species
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Quantitative and Qualitative Method for Sphingomyelin by LC-MS Using Two Stable Isotopically Labeled Sphingomyelin Species

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Isoform-selective assays for sphingosine kinase activity.

Melissa R Pitman1, Duyen H Pham, Stuart M Pitson

  • 1Molecular Signalling Laboratory, Centre for Cancer Biology, SA Pathology, Adelaide, SA, Australia.

Methods in Molecular Biology (Clifton, N.J.)
|April 25, 2012
PubMed
Summary

This study presents a new assay to distinguish between Sphingosine Kinase 1 (SK1) and Sphingosine Kinase 2 (SK2) enzyme activities. The method enables precise quantification of these crucial lipid kinases in various biological samples.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Enzymology

Background:

  • Sphingosine kinases (SK1 and SK2) are lipid kinases that produce sphingosine-1-phosphate (S1P).
  • S1P is a bioactive lipid mediator with diverse intracellular and extracellular functions.
  • SK1 and SK2 differ in gene origin, localization, expression, and function, necessitating selective activity assays.

Purpose of the Study:

  • To develop and validate methods for selectively detecting SK1 and SK2 enzyme activities in vitro.
  • To establish conditions that differentiate the catalytic activities of SK1 and SK2.
  • To provide a sensitive and reproducible assay for studying these kinases in biological contexts.

Main Methods:

  • Assays measure the production of radiolabeled S1P using [γ(32)P] ATP.

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  • Sphingosine-1-phosphate (S1P) is purified using Bligh-Dyer solvent extraction.
  • Separation and quantification of radiolabeled S1P are achieved via thin-layer chromatography (TLC) and phosphor imaging.

    • Main Results:

    • The described assay selectively detects SK1 and SK2 activities.
    • Optimized conditions allow discrimination between the two enzyme isoforms.
    • The assay demonstrates sensitivity and reproducibility across different sample types.

    Conclusions:

    • A novel, sensitive, and reproducible assay for selective SK1 and SK2 activity detection has been established.
    • This method facilitates the study of sphingosine kinase function in various biological systems.
    • The assay is applicable to tissue, cell, and recombinant protein samples.