| Assay Method Information | |
| | Radioligand Binding Assay |
| Description: | In this assay, COS-7 cells are transiently transfected with the hFP recombinant plasmid using LipofectAMINE Reagent. Forty-eight hours later, the transfected cells are washed with Hank's Balanced Salt Solution (HBSS, without CaCl2, MgCl2, MgSO4, or phenol red). The cells are detached with versene, and HBSS is added. The mixture is centrifuged at 200 g for 10 minutes, at 4° C. to pellet the cells. The pellet is resuspended in Phosphate-Buffered Saline-EDTA buffer (PBS; 1 mM EDTA; pH 7.4; 4° C.). The cells are disrupted by nitrogen cavitation (Parr model 4639), at 800 psi, for 15 minutes at 4° C. The mixture is centrifuged at 1000 g for 10 minutes at 4° C. The supernatant is centrifuged at 100,000 g for 60 minutes at 4° C. The pellet is resuspended to 1 mg protein/mL TME buffer (50 mM Tris; 10 mM MgCl2; 0.1 mM EDTA; pH 6.0; 4° C.) based on protein levels measured using the Pierce BCA Protein Assay kit. The homogenate is mixed for 10 seconds using a Kinematica POLYTRON (available from KINEMATICA AG, Luzernerstrasse147A CH-6014 Littau, Switzerland). The membrane preparations are then stored at −80° C., until thawed for assay use. The receptor competition binding assays are developed in a 96 well format. Each well contains 100 g of hFP membrane, 5 nM (3 H) PGF2α, and the various competing compounds in a total volume of 200 L. The plates are incubated at 23° C. for 1 hour. The incubation is terminated by rapid filtration using the Packard Filtermate 196 harvester through Packard UNIFILTER GF/B filters (available from Packard Instrument Co., Inc. of Downers Grove Ill.) pre-wetted with TME buffer. The filter is washed four times with TME buffer. Packard Microscint 20, a high efficiency liquid scintillation cocktail, is added to the filter plate wells and the plates remain at room temperature for three hours prior to counting. The plates are read on a Packard TOPCOUNT Microplate Scintillation Counter (also available from Packard Instrument Co., Inc.) |
| Affinity data for this assay | |
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