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| | pH-based Assay |
| Description: | pH dependent Ca2+ responses in TRPV1/CHO cells cultured in a 96-well plate were determined (see, e.g., FIG. 2 of U.S. Patent Application Publication No. US 2009/0170868 A1). In particular, Ca2+ influx into TRPV1/CHO cells in response to low pH as measured by Fura-2 AM fluorescence was determined. The cells were stimulated using 3.0 mM (well numbers B1-B6), 3.1 mM (C1-C6), 3.2 mM (D1-D6), 3.3 mM (E1-E6), 3.4 mM (F1-F6), 3.5 mM (G1-G6), or 3.6 mM (H1-H6) H2SO4 or pH 7.2 measuring buffer without H2SO4 (A1-A6). Culture medium was removed using an 8-channel-pipette (Rainin, USA) from the 96-well plate and the wells were refilled with 100 uL of loading buffer (20 mM HEPES, 115 mM NaCl, 5.4 mM KCl, 0.8 mM MgCl2, 1.8 mM CaCl2, 13.8 mM D-glucose, 2.5 mM probenecid, pH 7.4) containing 5 uM Fura-2 AM (Dojin, Japan). The 96-well plate was incubated at 37° C. for 45 min. The loading buffer was removed from each well. The cells were subsequently washed twice with 150 uL of measuring buffer (20 mM HEPES, 115 mM NaCl, 5.4 mM KCl, 0.8 mM MgCl2, 5.0 mM CaCl2, 13.8 mM D-glucose, 0.1% BSA, pH 7.4) (no probenecid). The wells were then refilled with 80 uL of measuring buffer. After an incubation at 4° C. for 15 min, the 96-well plate was transferred to a model FDSS-3000 plate reader apparatus (Hamamatsu Photonics K.K., Japan). The Fura-2 fluorescent intensity was monitored at a wavelength of 340 nm and at 380 nm, respectively, at a rate of 0.5 Hz for a total of 240 seconds. After 16 time points (32 sec) of baseline detection, 20 uL of agonist solution was added to each well. The final volume was 100 uL/well. Fluorescence intensity ratio refers to the fluorescence intensity at 340 nm over the fluorescence intensity at 380 nm at a particular time point. The baseline was set as the average of the fluorescent intensity ratios for the first 16 time points before the addition of agonist solution. The maximum response was the highest fluorescent intensity ratio during the 60 time points following addition of agonist solution. |
| Affinity data for this assay | |
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