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3 protocols using phosphatidylinositol specific phospholipase c

1

Enzymatic Release of GPI-Anchored Proteins

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The enzymatic action of phosphatidylinositol-specific phospholipase C (Sigma-Aldrich, St Louis, MO, USA) results in the release of GPI-anchored proteins, such as VCAM-1, uPAR, CD55 and CD59, from the cell membranes. BM stromal cells and BM mononuclear cells (MNCs) were incubated with phosphatidylinositol-specific phospholipase C (5 or 100 mU/ml) for 3 h at 37 °C. Alexa Fluor 647-conjugated anti-mouse CD106 clone 429 (BioLegend, San Diego, CA, USA), PE-conjugated anti-mouse uPAR clone 109801 (R&D Systems, Minneapolis, MN, USA), PE-conjugated hamster anti-mouse CD55 and anti-mouse CD59a clone 7A6 (BD Biosciences, San Jose, CA, USA) were applied to detect GPI-anchored proteins.
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2

Purification and Characterization of Prion Protein Antibodies

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POM1, POM3, POM4, POM6 and POM11 antibodies (Polymenidou et al., 2008 (link)) were provided to J.T. by the University of Zürich, Institute of Neuropathology. Hybridomas producing the human-mouse chimeric monoclonal antibodies D13 and D18 (Safar et al., 2002 (link); Williamson et al., 1998 (link)) were provided by Anthony Williamson, Dennis Burton, and Bruce Chesebro. Antibodies were affinity-purified using protein A spin columns (Montage Antibody Purification Kit, EMD Millipore). Fab fragments of D18 were prepared using the Pierce Fab preparation kit from Thermo Scientific. The purity of all antibody preparations was verified by SDS-PAGE. The following antibodies were purchased from commercial sources: 100B3 (Wagening UR, Netherlands); 6D11 (BioLegend, cat #808001); ICSM-18 and ICSM-35 (D-Gen Ltd.).
Pentosan polysulfate (average MW = 4500–5000) was purchased from Biopharm Australia Pty Ltd., and phosphatidylinositol-specific phospholipase C from Sigma (cat #P5542).
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3

Inhibition of MAPK Signaling Pathways

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suPAR and ATF were purchased from American Diagnostica, Inc. (Greenwich, CT). fMLP, Pertussis toxin (Gαi inhibitor, 100ng/ml), Phosphatidylinositol-specific-phospholipase C (100µg/mL), PD98059 (ERK inhibitor, 25µM) SB203580 (p38MAPK inhibitor, 10µM), SP600125 (JNK inhibitor, 1µM), EGFR inhibitor ( AG1478, 10µM), ε-aminocaproic acid (EACA; plasmin inhibitor, 100µM), aprotinin (plasmin inhibitor, 100 units/ml) and GM6001 (MMP inhibitor, 10nM) were purchased from Sigma Chemical Co. (St. Louis, MO). Peroxidase-conjugated anti-rabbit IgG antibody (raised in goat) and peroxidase-conjugated anti-mouse IgG antibody (raised in goat) were purchased from Jackson ImmunoResearch Laboratories, Inc. (West Grove, PA). Phospho-ERK1/2 antibody was purchased from Promega, Inc. (Madison, WI). Total ERK 1/2 antibody was purchased from BD Transduction Laboratories (Lexington, KY). Phospho-p38MAPK and phospho-JNK antibodies were purchased from Biosource (Camarillo, CA). Total p38MAPK and JNK antibodies were purchased from Cell Signaling (Beverley, MA). Dulbecco’s minimal essential medium (DMEM) and Dulbecco’s phosphate buffered saline (dPBS) were purchased from Corning Cellgro (Corning, NY).
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