title: Phosphoinositide and inositol phosphate analysis in lymphocyte activation.
abstract: Lymphocyte antigen receptor engagement profoundly changes the cellular content of phosphoinositide lipids and soluble inositol phosphates. Among these, the phosphoinositides phosphatidylinositol 4,5-bisphosphate (PIP2) and phosphatidylinositol 3,4,5-trisphosphate (PIP3) play key signaling roles by acting as pleckstrin homology (PH) domain ligands that recruit signaling proteins to the plasma membrane. Moreover, PIP2 acts as a precursor for the second messenger molecules diacylglycerol and soluble inositol 1,4,5-trisphosphate (IP3), essential mediators of PKC, Ras/Erk, and Ca2+ signaling in lymphocytes. IP3 phosphorylation by IP3 3-kinases generates inositol 1,3,4,5-tetrakisphosphate (IP4), an essential soluble regulator of PH domain binding to PIP3 in developing T cells. Besides PIP2, PIP3, IP3, and IP4, lymphocytes produce multiple other phosphoinositides and soluble inositol phosphates that could have important physiological functions. To aid their analysis, detailed protocols that allow one to simultaneously measure the levels of multiple different phosphoinositide or inositol phosphate isomers in lymphocytes are provided here. They are based on thin layer, conventional and high-performance liquid chromatographic separation methods followed by radiolabeling or non-radioactive metal-dye detection. Finally, less broadly applicable non-chromatographic methods for detection of specific phosphoinositide or inositol phosphate isomers are discussed. Support protocols describe how to obtain pure unstimulated CD4+CD8+ thymocyte populations for analyses of inositol phosphate turnover during positive and negative selection, key steps in T cell development.
authors.affiliation: The Scripps Research Institute, La Jolla, California.
authors.forename: Karsten
authors.initials: K
authors.lastname: Sauer
authors.affiliation: Washington University School of Medicine, St. Louis, Missouri.
authors.forename: Yina Hsing
authors.initials: YH
authors.lastname: Huang
authors.affiliation: University Medical Center Hamburg-Eppendorf, Hamburg, Germany.
authors.forename: Hongying
authors.initials: H
authors.lastname: Lin
authors.affiliation: Genomics Institute of the Novartis Research Foundation (GNF), San Diego, California.
authors.forename: Mark
authors.initials: M
authors.lastname: Sandberg
authors.affiliation: University Medical Center Hamburg-Eppendorf, Hamburg, Germany.
authors.forename: Georg W
authors.initials: GW
authors.lastname: Mayr
mesh_terms: D000818:Animals; D002469:Cell Separation / Q000379:methods; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D002852:Chromatography, Ion Exchange / Q000379:methods; D002855:Chromatography, Thin Layer / Q000379:methods; D006801:Humans; D007202:Indicators and Reagents / Q000737:chemistry; D007294:Inositol / Q000737:chemistry; D007295:Inositol Phosphates / Q000032:analysis*; D008213:Lymphocyte Activation; D008214:Lymphocytes / Q000737:chemistry / Q000166:cytology; D010716:Phosphatidylinositols / Q000032:analysis*; D011849:Radioactive Tracers; D015398:Signal Transduction; D013194:Staining and Labeling / Q000379:methods
chemical_list: D007202:Indicators and Reagents; D007295:Inositol Phosphates; D010716:Phosphatidylinositols; D011849:Radioactive Tracers; D007294:Inositol