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Phosphoinositide profiling in complex lipid mixtures using electrospray ionization mass spectrometry.
Markus R Wenk1, Louise Lucast, Gilbert Di Paolo
1Howard Hughes Medical Institute, Department of Cell Biology, Yale University School of Medicine, Boyer Center for Molecular Medicine, 295 Congress Avenue, New Haven, Connecticut 06511, USA. markus.wenk@yale.edu
Nature Biotechnology
|June 17, 2003
Summary
This study introduces a mass spectrometry method for measuring phosphoinositides, vital signaling lipids. The method detected elevated phosphatidylinositol bisphosphate (PIP2) in Lowe syndrome patients, suggesting a diagnostic application for metabolic disorders.
Area of Science:
- Lipidomics
- Cell signaling
- Biochemistry
Background:
- Phosphoinositides are crucial intracellular signaling lipids.
- Their low concentrations pose challenges for direct mass measurements.
- Understanding phosphoinositide metabolism is key to various cellular processes.
Purpose of the Study:
- To develop a sensitive method for detecting, identifying, and quantifying phosphoinositides (PIPs and PIP2) with varying fatty acid compositions.
- To analyze phosphoinositide profiles in human fibroblasts from Lowe syndrome patients.
- To investigate phosphoinositide metabolism in Saccharomyces cerevisiae mutants deficient in key metabolic enzymes.
Main Methods:
- Electrospray ionization mass spectrometry (ESI-MS) was employed for sensitive detection and quantification.
- Analysis of total lipid extracts from human fibroblasts and yeast cells.
- Comparative analysis of phosphoinositide concentrations and profiles in wild-type and mutant yeast strains.
Main Results:
- The ESI-MS method successfully detected and quantified PIP and PIP2 with different fatty acid compositions.
- Elevated concentrations of PIP2 were observed in human fibroblasts from Lowe syndrome patients.
- Yeast mutants showed distinct changes in PIP concentrations and profiles, indicating metabolic pooling.
Conclusions:
- Mass spectrometric analysis of phosphoinositides provides a sensitive and advantageous approach compared to existing methods.
- This technique can serve as a powerful diagnostic tool for human diseases linked to phosphoinositide metabolism defects.
- The findings highlight the complexity of phosphoinositide metabolism and its role in cellular function.