| Assay Method Information | |
| | Inhibition Assay |
| Description: | Accumulation of pheophorbide a, a fluorescent ABCG2 substrate (Jonker et al., Proc. Natl. Acad. Sci. USA, 99: 15649-54 (2002) and Robey et al., Cancer Res., 64: 1242-6 (2004)), formed the basis of the assay for inhibitors of ABCG2 activity (Henrich et al., J. Biomol. Screen, 11: 176-83 (2006)). Briefly, NCI-H460/MX20 cells are transferred to black wall, clear bottom 384-well polylysine-coated assay plates (Corning, Corning, N.Y.) and allowed to attach for several hours. Pheophorbide a (1 μM final concentration) is added immediately followed by compounds or vehicle (DMSO/PBS) control and incubated an additional 18 h. After removal of medium and washing with PBS containing Ca2+ and Mg2+, fluorescence intensity is read on a Tecan Safire fluorescence plate reader in bottom read mode, 395 nm excitation, and 670 nm emission. Each plate has control wells containing 10 μM (final concentration) FTC. |
| Affinity data for this assay | |
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