Separation and detection of all phosphoinositide isomers by ESI-MS.
Phosphoinositides (PIs) play fundamental roles as signalling molecules in numerous cellular processes. Direct analysis of PIs is typically accomplished by metabolic labelling with (3)H-inositol or inorganic (32)P followed by deacylation, ion-exchange chromatography and flow scintillation detection. This analysis is laborious, time-consuming, and involves massive amounts of radioactivity. To overcome these limitations we established a robust, non-radioactive LC-ESI-MS assay for the separation and analysis of deacylated PIs that allows discrimination of all isomers without the need for radioactive labelling. We applied the method to various cell types to study the PI levels upon specific stimulation.
Kiefer
Sabine
S
Institute of Pharmaceutical Biology, University of Basel, Klingelbergstrasse 50, 4056 Basel, Switzerland.
Rogger
Johannes
J
Melone
Anna
A
Mertz
Ann C
AC
Koryakina
Anna
A
Hamburger
Matthias
M
Küenzi
Peter
P
D002478:Cells, Cultured; D002852:Chromatography, Ion Exchange; D006801:Humans; D007536:Isomerism; D007553:Isotope Labeling; D010716:Phosphatidylinositols / Q000032:analysis*; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*
D010716:Phosphatidylinositols