Calcium Imaging of GPCR Activation Using Arrays of Reverse Transfected HEK293 Cells in a Microfluidic System
AbstractReverse-transfected cell arrays in microfluidic systems have great potential to perform large-scale parallel screening of G protein-coupled receptor (GPCR) activation. Here, we report the preparation of a novel platform using reverse transfection of HEK293 cells, imaging by stereo-fluorescence microscopy in a flowcell format, real-time monitoring of cytosolic calcium ion fluctuations using the fluorescent protein Cameleon and analysis of GPCR responses to sequential sample exposures. To determine the relationship between DNA concentration and gene expression, we analyzed cell arrays made with variable concentrations of plasmid DNA encoding fluorescent proteins and the Neurokinin 1 (NK1) receptor. We observed pronounced effects on gene expression of both the specific and total DNA concentration. Reverse transfected spots with NK1 plasmid DNA at 1% of total DNA still resulted in detectable NK1 activation when exposed to its ligand. By varying the GPCR DNA concentration in reverse transfection, the sensitivity and robustness of the receptor response for sequential sample exposures was optimized. An injection series is shown for an array containing the NK1 receptor, bitter receptor TAS2R8 and controls. Both receptors were exposed 14 times to alternating samples of two ligands. Specific responses remained reproducible. This platform introduces new opportunities for high throughput screening of GPCR libraries. View Full-Text
- Supplementary File 1:
AVI-Document (AVI, 3095 KB)
- Supplementary File 2:
PDF-Document (PDF, 411 KB)
- Supplementary File 3:
Share & Cite This Article
Roelse, M.; Henquet, M.G.; Verhoeven, H.A.; de Ruijter, N.C.; Wehrens, R.; van Lenthe, M.S.; Witkamp, R.F.; Hall, R.D.; Jongsma, M.A. Calcium Imaging of GPCR Activation Using Arrays of Reverse Transfected HEK293 Cells in a Microfluidic System. Sensors 2018, 18, 602.
Roelse M, Henquet MG, Verhoeven HA, de Ruijter NC, Wehrens R, van Lenthe MS, Witkamp RF, Hall RD, Jongsma MA. Calcium Imaging of GPCR Activation Using Arrays of Reverse Transfected HEK293 Cells in a Microfluidic System. Sensors. 2018; 18(2):602.Chicago/Turabian Style
Roelse, Margriet; Henquet, Maurice G.; Verhoeven, Harrie A.; de Ruijter, Norbert C.; Wehrens, Ron; van Lenthe, Marco S.; Witkamp, Renger F.; Hall, Robert D.; Jongsma, Maarten A. 2018. "Calcium Imaging of GPCR Activation Using Arrays of Reverse Transfected HEK293 Cells in a Microfluidic System." Sensors 18, no. 2: 602.
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.