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Assay Method Information

Assay Name:  THP-1 RPS6 ELISA Assay
Description:  To measure the Phosphorylated Ribosomal Protein S6 (RPS6) in cell lysates, THP-1 cells (Human Acute Monocytic Leukemia) are purchased from ATCC (Manassas, Va.) and maintained in RPMI with 10% FBS (Gibco/Life Technologies, Carlsbad, Calif.). For the assay, THP-1 cells are serum starved overnight in RPMI, then plated in RPMI (2105 cells/well in 90 μL) into 96-well flat-bottom tissue culture treated plates (Corning, Corning, N.Y.), in the presence or absence of a concentration range of test compounds. Covered plates are incubated for 2 hours at 37 C., 5% CO2 then treated with or without 10 nM MCP-1(MYBioSource, San Diego, Calif.) for 15 minutes at 37 C., 5% CO2. Plates are centrifuged at 1600 RPM and supernatants are removed. Cells are lysed in Lysis Buffer (Cell Signaling, Danvers, Mass.) with Protease Inhibitor (Calbiochem/EMD, Germany), PMSF (Sigma, St Louis Mo.), HALTS (Thermo Fisher, Rockford, Ill.) for 30 min on wet ice. Cell lysates are frozen at −80 C. before testing. The lysates are tested in the Human/Mouse/Rat Phospho-RPS6 ELISA (R&D Systems, Inc. Minn, MN). The plate is measured using a microplate reader (SpectraMax M5-Molecular Devices, LLC Sunnyvale, Calif.) set to 450 nm with a wavelength correction of 540. IC50 determination is performed by fitting the curve of inhibitor percent inhibition versus the log of the inhibitor concentration using the GraphPad Prism 5.0 software.
Affinity data for this assay
 

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Last update November 1, 2007
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