Quantification of PtdInsP3 molecular species in cells and tissues by mass spectrometry.

Quantification of PtdInsP3 molecular species in cells and tissues by mass spectrometry.
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DOI:
10.1038/nmeth.1564
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发表时间:
2011-03
期刊:
影响因子:
48
通讯作者:
Hawkins, Phillip T.
Hawkins, Phillip T.
中科院分区:
生物学1区
文献类型:
--
作者:
Clark, Jonathan;Anderson, Karen E.;Juvin, Veronique;Smith, Trevor S.;Karpe, Fredrik;Wakelam, Michael J. O.;Stephens, Len R.;Hawkins, Phillip T.

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Class I phosphoinositide-3-kinase (PI3K) isoforms generate the intracellular signalling lipid, phosphatidylinositol(3,4,5)trisphosphate (PtdIns(3,4,5)P3). PtdIns(3,4,5)P3 regulates major aspects of cellular behavior and the use of both genetic and pharmacological intervention has revealed important isoform-specific roles for PI3Ks in health and disease. Despite this interest, current methods for measuring PtdIns(3,4,5)P3 have major limitations, including insensitivity, reliance on radiolabeling, low throughput and an inability to resolve different fatty-acyl species. We introduce a methodology based upon phosphate methylation coupled to high performance liquid chromatography-mass spectrometry (HPLC-MS) to solve many of these problems and describe an integrated approach to quantify PtdIns(3,4,5)P3 and related phosphoinositides (regio-isomers of PtdInsP and PtdInsP2 are not resolved). This methodology can quantify multiple fatty-acyl species of PtdIns(3,4,5)P3 in un-stimulated murine and human cells (≥ 105) or tissues (≥ 0.1 mg) and their increase upon appropriate stimulation.
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