Ready-To-Glow Secreted Luciferase Reporter Assay

Limit of detection for recombinant Metridia luciferase protein

Limit of detection for recombinant Metridia luciferase protein. The indicated amounts of recombinant Metridia luciferase (fg/well) were spiked into DMEM containing 10 FBS. Metridia luciferase activity was measured in a 96-well format on the SpectraMax L. The limit of detection was determined to be 2 fg/well (40 fg/ml).

High signal intensity and stability using secreted Metridia luciferase

High signal intensity and stability using secreted Metridia luciferase. CHO cells were plated into 96-well plates and transiently transfected with CMV-driven constructs encoding non-secreted firefly luciferase, non-secreted Renilla luciferase, and secreted Metridia luciferase. 24 hr after transfection, luciferase activity in equivalent samples was analyzed by addition of the recommended substrate. The signal was measured at different timepoints over a period of 45 min. neg = negative control.

Monitoring promoter activation using the sequence-optimized secreted Metridia luciferase reporter

Monitoring promoter activation using the sequence-optimized secreted Metridia luciferase reporter. HeLa cells were transiently transfected with a vector construct containing the NFkB response element driving the expression of sequence-optimized secreted Metridia luciferase. 24 hr after transfection, the media was removed and replaced by media with or without TNF-α (100 ng/ml) to activate the NFkB signal transduction pathway. Six hr after addition of TNF-α, samples of the media were removed and analyzed for Metridia luciferase activity. The fold induction was calculated for different time points following the addition of substrate.

Flow chart of the Ready-To-Glow Secreted Luciferase Reporter System

Flow chart of the Ready-To-Glow Secreted Luciferase Reporter System.

Flow chart of the Ready-To-Glow Secreted Luciferase Reporter System

Flow chart of the Ready-To-Glow Secreted Luciferase Reporter System.

Use of secreted Metridia luciferase in a high-throughput screening (HTS) application

Use of secreted Metridia luciferase in a high-throughput screening (HTS) application. The figure shows a screen shot from a CCD camera of a 1,536-well plate containing stable CHO cells transfected with a forskolin-responsive Metridia luciferase gene (pASM-Lu164). 300 cells/well were plated in a 1,536-well microtiter plate. Cells were incubated with increasing concentrations of forskolin and the plate was incubated for 4 hr at 37° C. Metridia substrate was added in increasing concentrations and the plate was visualized using a CCD camera system (integration time: 60 sec). (Courtesy of Bayer Health Care, Germany). This pseudocolor image reflects luminescence intensity. Yellow regions are the brightest, while black regions are the least bright.