Abstract
Phosphatidylinositol 3,4,5-trisphosphate [PtdIns(3,4,5)P3] is a second messenger produced in response to agonist stimulation. Traditionally, visualization of phosphoinositide polyphosphates (PtdInsPn) in living cells is accomplished using chimeric green fluorescent protein (GFP)-pleckstrin homology (PH) domain proteins, while PtdInsPn quantitation is accomplished by extraction and separation of radiolabeled cellular PtdInsPns. Here we describe preparation of a covalent protein-PtdIns(3,4,5)P3 immunogen, characterization of binding selectivity of an anti-PtdIns(3,4,5)P3 IgM, and immunodetection of PtdIns(3,4,5)P3 in stimulated mammalian cells. This antibody has greater than three orders of magnitude selectivity for binding PtdIns(3,4,5)P3 relative to its precursor, phosphatidylinositol 4,5-bis-phosphate (PtdIns(4,5)P2), and is therefore optimal for studies of cell function. The immunodetection in platelet-derived growth factor (PDGF)-stimulated NIH 3T3 cells was bench-marked against HPLC analysis of [3H]-myo-inositol-labeled cellular PtdInsPns. In addition, the changes in subcellular amounts and localizations of both PtdIns(3,4,5)P3 and PtdIns(4,5)P2 in stimulated NIH 3T3 fibroblasts and human neutrophils were observed by immunofluorescence. In insulin- or PDGF-stimulated fibroblasts, PtdIns(3,4,5)P3 levels increased in the cytoplasm, peaking at 10 min. In contrast, increases in the PtdIns(4,5)P2 levels were detected in nuclei, corresponding to the production of new substrate following depletion by phosphoinositide (PI) 3-kinase.
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Dates
Type | When |
---|---|
Created | 14 years, 4 months ago (April 1, 2011, 3:17 a.m.) |
Deposited | 5 months, 2 weeks ago (March 4, 2025, 11:26 a.m.) |
Indexed | 4 months, 3 weeks ago (March 30, 2025, 3:33 a.m.) |
Issued | 23 years, 3 months ago (May 1, 2002) |
Published | 23 years, 3 months ago (May 1, 2002) |
Published Online | 23 years, 3 months ago (May 1, 2002) |
Published Print | 23 years, 3 months ago (May 1, 2002) |
@article{Chen_2002, title={A Monoclonal Antibody to Visualize PtdIns(3,4,5)P3 in Cells}, volume={50}, ISSN={1551-5044}, url={http://dx.doi.org/10.1177/002215540205000511}, DOI={10.1177/002215540205000511}, number={5}, journal={Journal of Histochemistry & Cytochemistry}, publisher={SAGE Publications}, author={Chen, Riyan and Kang, Veronica H. and Chen, Jian and Shope, Joseph C. and Torabinejad, Javad and DeWald, Daryll B. and Prestwich, Glenn D.}, year={2002}, month=may, pages={697–708} }