| Assay Method Information | |
| | Mineralocorticoid Receptor Transactivation Potencies for Cortisol and 17-ester Derivatives |
| Description: | Mineralocorticoid receptor (MR) activation potency was assessed using a HEK 293T cell line containing the UAS-bla reporter (UAS-bla HEK 293T CELLSENSOR ). This cell line was stably cotransfected with an expression construct containing β-lactamase cDNA under control of the GAL4 Upstream Activator Sequence (UAS) and another expression construct encoding for the fusion protein GAL4(DBD)-MR(LBD). Results for one experiment performed in duplicate for 9 compounds and the control compound, aldosterone, in agonist mode are summarized in Table 4. All assays were performed as 10-point dose responses using a half log-fold dilution series starting with a maximum compound concentration of 100 nM. The compounds were incubated for 16 hours. The activation of the fusion protein GAL4(DBD)-MR(LBD) leads to expression of the reporter β-lactamase which is detected by the conversion of a FRET substrate in a ratiometric assay format. This functional assay allows for measurement of receptor agonism by compounds and can be used to determine compound potency and selectivity. Assay reproducibility was determined by calculating Z′ values for untreated versus maximum stimulation. The Z′ value was greater than 0.6, indicating good reproducibility of the assay format. |
| Affinity data for this assay | |
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