TLR2/NF-kB LeeporterTM Luciferase Reporter-HEK293 Cell Line

The TLR2/NF-kB LeeporterTM Luciferase Reporter cell line is a stably transfected HEK 293 cell line which expresses full-length human Toll-like receptor 2 (TLR2) and Renilla luciferase reporter gene under the transcriptional control of the NF-kB response element. TLR2 is one of the key innate immune receptors. Functional activity of the cell line has been validated by TLR2 ligand assay, in which upon activation by Pam3CSK4, TLR2 quickly initiates downstream signaling pathway and mediates nuclear translocation of NF-kB (Figure 1) .

Functional Assay

Each vial contains 2 ~ 3 x 10^6 cells in 1 ml of 90% FBS + 10% DMSO.

Dry ice

Immediately upon receipt, store in liquid nitrogen.

Application: Monitor the TLR2 signaling pathway activity. Screen for activators or inhibitors of the TLR2 signaling pathway. Culture conditions: Cells should be grown at 37°C with 5% CO2 using DMEM medium (w/ L-Glutamine, 4.5g/L Glucose and Sodium Pyruvate) supplemented with 10% heat-inactivated FBS and 1% Pen/Strep, plus 2 μg/ml of Puromycin and 5 μg/ml Blasticidin (Note: Puromycin and Blasticidin can be omitted during the reporter cell assays) . It is recommended to quickly thaw the frozen cells upon receipt or from liquid nitrogen in a 37°C water-bath, transfer to a tube containing 10 ml of growth medium without Puromycin and Blasticidin, spin down cells, resuspend cells in pre-warmed growth medium without Puromycin and Blasticidin, transfer resuspended cells to T25 flask and culture in 37°C-CO2 incubator. Leave the T25 flask in the incubator for 1~3 days without disturbing or changing the medium until cells completely recover viability and become adherent. Once cells are over 90% adherent, remove growth medium and passage the cells through trypsinization and centrifugation. At first passage, switch to growth medium containing Puromycin and Blasticidin. Cells should be split before they reach complete confluence. To passage the cells, detach cells from culture vessel with Trypsin/EDTA, add complete growth medium and transfer to a tube, spin down cells, resuspend cells and seed appropriate aliquots of cells suspension into new culture vessels. Subcultivation ration = 1:10 to 1:20 weekly. To achieve satisfactory results, cells should not be passaged over 16 times. Functional validation: A. Response of TLR2/NF-kB LeeporterTM – HEK293 cells to Pam3CSK4. 1. Harvest TLR2/NF-kB LeeporterTM – HEK293 cells and seed cells into a white solid-bottom 96-well microplate in 100 μl of growth medium at 5 x 10^4 cells/well. 2. Incubate cells at 37°C in a CO2 incubator for overnight. 3. The next day, stimulate cells with various concentrations of Pam3CSK4. 4. Incubate at 37°C in a CO2 incubator for 16 hours. 5. Equilibrate the plate to room temperature for 10 minutes. 6. Add 50 μl of luciferase assay reagent (Abeomics, Cat #17-1101; Refer to the reagent datasheet for the detailed luciferase assay protocol) per well. 7. Read the plate in 1-5 minutes to measure luminescence using a microplate luminometer.